Skip to main content

SYSTEMATIC REVIEW article

Front. Endocrinol., 29 May 2024
Sec. Bone Research

Liraglutide, a glucagon-like peptide-1 receptor agonist, inhibits bone loss in an animal model of osteoporosis with or without diabetes

Zongyi Wu&#x;Zongyi Wu1†Wei Deng&#x;Wei Deng2†Yiming Ye&#x;Yiming Ye2†Jie XuJie Xu2Deyu HanDeyu Han2Yu Zheng*Yu Zheng3*Qun Zheng*Qun Zheng2*
  • 1Department of Orthopedics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, China
  • 2Department of Rheumatology Immunology, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, China
  • 3Department of Nephrology, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, China

Introduction: Liraglutide (Lrg), a novel anti-diabetic drug that mimics the endogenous glucagon-like peptide-1 to potentiate insulin secretion, is observed to be capable of partially reversing osteopenia. The aim of the present study is to further investigate the efficacy and potential anti-osteoporosis mechanisms of Lrg for improving bone pathology, bone- related parameters under imageology, and serum bone metabolism indexes in an animal model of osteoporosis with or without diabetes.

Methods: Eight databases were searched from their inception dates to April 27, 2024. The risk of bias and data on outcome measures were analyzed by the CAMARADES 10-item checklist and Rev-Man 5.3 software separately.

Results: Seventeen eligible studies were ultimately included in this review. The number of criteria met in each study varied from 4/10 to 8/10 with an average of 5.47. The aspects of blinded induction of the model, blinding assessment of outcome and sample size calculation need to be strengthened with emphasis. The pre-clinical evidence reveals that Lrg is capable of partially improving bone related parameters under imageology, bone pathology, and bone maximum load, increasing serum osteocalcin, N-terminal propeptide of type I procollagen, and reducing serum c-terminal cross-linked telopeptide of type I collagen (P<0.05). Lrg reverses osteopenia likely by activating osteoblast proliferation through promoting the Wnt signal pathway, p-AMPK/PGC1α signal pathway, and inhibiting the activation of osteoclasts by inhibiting the OPG/RANKL/RANK signal pathway through anti-inflammatory, antioxidant and anti-autophagic pathways. Furthermore, the present study recommends that more reasonable usage methods of streptozotocin, including dosage and injection methods, as well as other types of osteoporosis models, be attempted in future studies.

Discussion: Based on the results, this finding may help to improve the priority of Lrg in the treatment of diabetes patients with osteoporosis.

1 Introduction

The World Health Organization (WHO) defined osteoporosis as a progressive systemic skeletal disease characterized by low bone mass and microarchitectural deterioration of bone tissue, leading to increased bone fragility and susceptibility to fracture (1, 2). Aside from established risk factors including age, cigarette smoking, low physical activity, the use of drugs such as glucocorticoids, and low calcium and vitamin D levels (3, 4), diabetes has recently gained increased attention as a potential risk factor for osteoporosis and fragility fractures (5, 6). The likely reasons are related to insulin deficiency (7) and the impact of high glucose on calcium and phosphorus metabolism (8). Given that diabetes is a systemic disease associated with a range of chronic and severe complications, the disability and mortality rates are high once fractures occur in patients (6). Although conventional anti-osteoporosis drugs such as calcium tablets, vitamin D, bisphosphonates, denosumab, and teriparatide have been used to treat osteoporosis (2), they do not address the sustained effects of insulin deficiency and high glucose toxicity on bone metabolism. Therefore, besides conventional treatments, it is advantageous to explore drugs that offer both hypoglycemic and anti-osteoporosis effects.

New therapies for diabetes such as glucagon-like peptide-1 receptor agonists (GLP1Ras) have been shown to exert multiple effects on various organs and tissues, including the cardiovascular system (912), arteries (1315), lipid metabolism (16), and bone metabolism (17, 18). Liraglutide (Lrg), a representative GLP1Ras, is a novel anti-diabetic and widely used drug that mimics the endogenous GLP-1 to potentiate insulin secretion (19). Studies have demonstrated that osteoblastic cells express functional receptors for GLP-1 (20), and continuous subcutaneous infusion of GLP-1 or Lrg in diabetes-related osteoporosis models normalized their impaired trabecular architecture and promoted bone formation (8, 21). These findings highlight the potential use of Lrg in combating diabetes-related bone loss. However, the evidence provided by a single literature source is limited, and the mechanism of Lrg for osteoporosis- or diabetes-related osteoporosis has not been systematically summarized. Thus, the present study aims to investigate the pre-clinical evidence and possible mechanisms of Lrg in animal models of osteoporosis.

2 Methods

The Preferred Reporting Items for Systematic Review and Meta Analyses (PRISMA) checklist was used to structure this study (22).

2.1 Data sources and search strategies

A literature search was conducted to identify all published animal experimental studies of Lrg for osteoporosis in PubMed, EMBASE, Cochrane library, Web of Science database, WanFang, Chinese Science and Technology Journal Database, Chinese Biomedical Database, and China National Knowledge Infrastructure from their inception dates to April 27, 2024. “Liraglutide OR Victoza” AND “Osteoporosis OR Bone Loss OR Osteopenia OR Bone Metabolism” were used as the search terms in PubMed and were modified to suit other databases. A complete record of search strings in PubMed is provided as an example in Appendix 1. Additionally, the reference lists of potential articles were searched for relevant studies.

2.2 Eligibility criteria

The studies were screened by two independent authors (ZW and WD) and included if they met the following criteria: (1) studies assessing the efficacy of Lrg for osteoporosis or bone loss in animal models were included, (2) the treatment group used Lrg as monotherapy with unrestricted medicament type, dosage, duration, and route of administration, compared with a blank control or placebo in the control group, and (4) bone pathology and/or bone mineral density [including lumbar spine bone mineral density (L-BMD) and femur bone mineral density (F-BMD)] and/or bone histomorphometric parameters under micro-CT [trabecular number (Tb.N) and trabecular thickness (Tb.Th)] and/or bone maximum load and/or bone turnover markers [C-terminal cross-linked telopeptide of type I collagen (CTX), N-terminal propeptide of type I procollagen (PINP), and osteocalcin (OC)] and/or indicators of adverse reactions were selected as the primary outcome measures. Indicators reflecting the mechanisms of anti-osteoporosis action of Lrg were selected as secondary outcome measures. Studies were excluded if they (1) were not controlled experiments or in vivo animal experiments, (2) included combination medication in the treatment group, (3) lacked primary outcome indicators or had incomplete data, (4) had inconsistencies between graphic and textual data, and (5) were duplicate publications.

2.3 Data extraction

Two reviewers (ZW and YY) independently and systematically performed data extraction, focusing on study design characteristics, animal information, modeling methods, anesthetic details, interventions, and outcomes. Only data pertaining to the highest dose and the final time point were included when the experiments featured multiple Lrg dose groups or various measurement times. Graphical data were measured using Photoshop when results were only available in graphic from and no response was received from the corresponding authors.

2.4 Risk of bias in individual studies

Two independent authors (WD and JX) utilized the CAMARADES 10-item quality checklist (23) with minor modifications to assess study quality. The modifications included F—anesthetics without significant bone toxicity or protective activity and G—appropriate animal model with complications or risk factors (including aged, diabetes, hyperlipemia, or hypertensive). The authors first independently selected studies, extracted data, and scored the studies and then discussed disagreements with the corresponding author (QZ) until a consensus was reached.

2.5 Statistical analysis

We performed all of the analyses available using RevMan 5.3 software. For continuous data, standardized mean differences (SMDs) and 95% confidence intervals (95% CIs) were calculated to estimate the combined overall effect sizes. Heterogeneity was assessed using the Cochrane Q-statistic test (P < 0.05 was considered statistically significant) and the I2 statistic test (I2 < 50% was considered homogeneous). Data were aggregated using a random-effects model if there was high heterogeneity (I2 > 50%); otherwise, a fixed-effects model was adopted. Potential publication bias was assessed by a visual inspection of the funnel plot and asymmetry test to ensure the reliability of results. Sensitivity analysis and subgroup analyses were performed if necessary.

3 Results

3.1 Study selection

The electronic search yielded 128 studies, of which 17 eligible studies (8, 21, 2438) were ultimately included in this review. The specific search data and exclusion process are shown in Figure 1.

Figure 1
www.frontiersin.org

Figure 1 Summary of the process for identifying candidate studies.

3.2 Characteristics of included studies

Seven studies published in English and 10 in Chinese, spanning from 2013 to 2024, were included. The animal models involved were female Sprague–Dawley (SD) rats (51.3%), female Wistar rats (3.9%), female C57BL/6 mice (6.4%), male SD rats (28.8%), and male ApoE−/− mice (9.6%). A total of 132 rats and 25 mice were treated with Lrg; 130 rats and 25 mice served as controls. The primary outcome measures included bone pathology in three studies (26, 27, 37), F-BMD in 11 studies (21, 24, 2731, 3335, 39), L-BMD in three studies (8, 29, 36), Tb.Th and Tb.N in five studies (25, 28, 33, 35, 38), bone maximum load in three studies (24, 28, 30), CTX in five studies (21, 26, 31, 32, 37), OC in five studies (21, 3134), and PINP in four studies (8, 30, 32, 37). Relevant mechanism indicators such as superoxide dismutase (SOD), tumor necrosis factor-α (TNF-α), and other detailed characteristics of the eligible studies are shown in Table 1.

Table 1
www.frontiersin.org

Table 1 Characteristics of the included studies.

3.3 Study quality

The number of criteria met in each study ranged from 4/10 to 8/10, with an average of 5.47. The review authors’ judgments on each risk of bias item for each included study are presented in Table 2.

Table 2
www.frontiersin.org

Table 2 Risk of bias of the included studies.

3.4 Effectiveness

3.4.1 Bone pathology

Bone pathology was used as the primary outcome measure in three studies (26, 27, 37). Wang et al. (26) reported that diabetes osteoporosis rats treated with Lrg showed a marked improvement of osteoblasts on the surface of the femoral head, flattening of osteocytes, empty bone lacunae, and pyknosis of bone nuclei in the subchondral region. Two studies (27, 37) found that Lrg could increase trabecular bone and reduce trabecular bone spacing in diabetes osteoporosis rats compared with the control group.

3.4.2 Bone-related parameters under imageology and bone maximum load

Under dual energy X-ray absorptiometry, 11 studies (21, 24, 2731, 3335, 39) reported the effect of Lrg on F-BMD. After excluding one study where the author did not specify the number of rats in each group (30), a meta-analysis of 10 studies showed a significant effect of Lrg in increasing F-BMD [n = 192, SMD 1.95, 95% CI (1.59, 2.31), P < 0.00001; heterogeneity: χ2 = 8.02, I2 = 0%; Figure 2]. Three studies (8, 29, 36) demonstrated the positive effect of Lrg on increasing L-BMD with high heterogeneity [n = 58, SMD 2.27, 95% CI (-0.03, 4.58), P < 0.00001; heterogeneity: χ2 = 19.59, I2 = 90%]. Sensitivity analyses of L-BMD were conducted; a meta-analysis of two studies (8, 29) showed a significant effect of Lrg in increasing L-BMD [n = 40, SMD 3.29, 95% CI (2.26, 4.31), P < 0.00001; heterogeneity: χ2 = 1.06, I2 = 5%; Figure 3] after excluding one study (36) due to differing modeling methods. Under micro-CT, a meta-analysis of five studies (25, 28, 33, 35, 38) showed significant effects of Lrg in increasing Tb.N [n = 92, SMD 1.65, 95% CI (1.15, 2.15), P < 0.00001; heterogeneity: χ2 = 6.00, I2 = 33%; Figure 4A], Tb.Th [n = 92, SMD 1.93, 95% CI (0.68, 3.19), P = 0.003; Tau2 = 1.63, χ2 = 22.56, I2 = 82%; Figure 4B], and BV/TV [n = 114, SMD 1.86, 95% CI (0.65, 3.08), P < 0.00001; Tau2 = 1.84, χ2 = 31.99, I2 = 84%; Figure 4C). Sensitivity analyses of Tb.Th and BV/TV were conducted, showing that heterogeneity did not change substantially after removing any one study. Three studies reported that Lrg could improve bone maximum load (24, 28, 30), three-point bending stress (24, 28), and elastic modulus (24, 28) (P < 0.05) compared with the control group.

Figure 2
www.frontiersin.org

Figure 2 Forest plot: effects of liraglutide for increasing femur bone mineral density (F-BMD) compared with the control group.

Figure 3
www.frontiersin.org

Figure 3 Forest plot: effects of liraglutide for increasing lumbar spine bone mineral density (L-BMD) compared with the control group.

Figure 4
www.frontiersin.org

Figure 4 (A) Forest plot: effects of liraglutide for increasing trabeculae linear density (Tb.N) compared with the control group. (B) Forest plot: effects of liraglutide for increasing trabeculae thickness (Tb.Th) compared with the control group. (C) Forest plot: effects of liraglutide for increasing object surface/volume ratio (BV/TV) compared with the control group.

3.4.3 Serum OC, PINP, and CTX

A meta-analysis of five studies (21, 3134) demonstrated a significant effect of Lrg in increasing OC [n = 102, SMD 1.33, 95% CI (0.89, 1.77), P < 0.00001; heterogeneity: χ2 = 0.78, I2 = 0%; Figure 5]. Three studies (8, 30, 37) showed a significant effect of Lrg on increasing PINP (P < 0.05), although one study reported contrary efficacy (32) (P < 0.05). Additionally, five studies (21, 26, 31, 32, 37) reported that Lrg could reduce serum CTX compared with the control group (P < 0.05).

Figure 5
www.frontiersin.org

Figure 5 Forest plot: effects of liraglutide for increasing the level of osteocalcin (OC) compared with the control group.

3.4.4 Subgroup analysis

Does the combination of diabetes make a difference in the effect of Lrg on bone resorption? We conducted a subgroup analysis on the primary outcome measure BMD, considering whether diabetes was present. The results indicated that, although the difference was not statistically significant, the effect value of Lrg in the osteoporosis with diabetes group was better than that in the osteoporosis without diabetes group (SMD 2.05 ± 0.52 vs. SMD 1.85 ± 0.50, P = 0.59; Figure 6). Although not pronounced, Lrg appears to potentially increase the efficacy by mitigating the harmful effects of high blood sugar on osteoporosis while combating the disease itself. Further animal research is required to verify this potential advantage in the future.

Figure 6
www.frontiersin.org

Figure 6 Forest plot: effects of liraglutide on femur bone mineral density in the subgroup of whether diabetes is combined.

3.4.5 Mechanism indicators

A meta-analysis of five studies (21, 26, 27, 34, 37) demonstrated that Lrg could increase the level of osteoprotegerin (OPG) both in serum and bone [n = 88, SMD 3.13, 95% CI (1.27, 4.99), P = 0.001; heterogeneity: Tau2 = 3.33, χ2 = 27.95, I2 = 86%; Figure 7], and the heterogeneity of serum OPG was low (Tau² = 0.00; χ2 = 0.19, I² = 0; Figure 7). A meta-analysis of five studies (21, 24, 26, 27, 34) also showed that Lrg could reduce the level of receptor activator of nuclear factor-kappa B ligand (RANKL) both in serum and bone [n = 86, SMD 2.99, 95% CI (1.49, 4.50), P < 0.0001; heterogeneity: Tau2 = 2.06, χ2 = 18.36, I2 = 78%; Figure 8], and the heterogeneity of serum RANKL was low (Tau² = 0.00; χ2 = 0.39, I² = 0; Figure 8). STAT3 was reported as a potential target activated by Lrg to downregulate RANKL/OPG (P < 0.05) (26). Two studies (8, 34) indicated that Lrg could significantly reduce the levels of TNF-α, interleukin-6, and interleukin-1β (P < 0.05). Another two studies (25, 28) reported significant reductions in the level of reactive oxygen species (ROS) and malondialdehyde (MDA) (P < 0.05). Chong et al. also reported that the levels of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH) were increased by Lrg (P < 0.05) (28). Lrg was found to significantly reduce the levels of Beclin-1, Atg5, and Map1-LC3-II and increase the level of p62/SQSTMl (25). Furthermore, some studies reported that Lrg could increase the levels of Wnt3a, low-density lipoprotein receptor-related protein 5 (LRP-5), β-catenin (31), adiponectin receptor 1 (AdipoR1), and peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC1α) in osteoblasts (30).

Figure 7
www.frontiersin.org

Figure 7 Forest plot: effects of liraglutide for increasing the level of osteoprotegerin (OPG) both in serum and bone compared with the control group.

Figure 8
www.frontiersin.org

Figure 8 Forest plot: effects of liraglutide for reducing the level of receptor activator of nuclear factor-κ B ligand (RANKL) both in serum and bone compared with the control group.

4 Discussion

4.1 Summary of evidence

This is the first animal systematic review to include 17 studies with acceptable quality that estimate the efficacy and mechanisms of Lrg in models of osteoporosis. The findings indicate that Lrg possesses anti-osteoporosis potential while also lowering blood glucose levels.

4.2 Limitations

Several limitations exist within the current studies: (1) the potential for negative studies to exaggerate the efficacy of Lrg in osteoporosis due to reporting biases, (2) selection bias is likely due to the exclusive search of Chinese and English language databases, (3) methodological deficiencies are evident in the lack of blinded induction of models, blinded assessment of outcomes, and adequate sample size calculations, (4) the impact of obesity factors on osteoporosis remains controversial (40)—thus, caution is advised in interpreting results from studies treating osteoporosis caused by hyperlipidemia with liraglutide, (5) no study reported on disinfection during invasive procedures such as intraperitoneal injections, subcutaneous injections, and blood glucose measurements, which are crucial in maintaining integrity in animal studies, especially diabetic models, (6) the majority of studies did not document the incidence of rats being dropped due to complications during the modeling process, and (7) few studies addressed bone pathology directly.

4.3 Implication

In terms of methodology, although most studies met the scoring points of the CAMARADES 10-item quality checklist (23), the absence of crucial standards such as blinded induction of models, blinded assessment of outcomes, and rigorous sample size calculations could undermine the reliability of the findings. Adherence to the ARRIVE guidelines (41) is recommended to address these issues. When describing sample size calculation, the rational for the number of animals used should be clearly stated along with details of any calculations performed (42, 43). Measures taken to minimize the effects of subjective bias when allocating animals to treatments (e.g., randomization procedures) and when assessing results (e.g., details on who was blinded and at what stage) should also be documented. Wang et al. (44) provided a robust example of how to describe sample size, random grouping post-modeling, and blinded evaluation of outcomes.

Experimental animals with comorbidities such as advanced age, obesity, hypertension, hyperglycemia, or other risk factors may more closely mirror the physiology of patients with osteoporosis, potentially increasing the clinical relevance of research findings (45). However, it is necessary to adjust modeling approaches, such as drug dosage and mode of administration to optimize the success rate and safety of complex models in animals. In the included studies, six utilized an ovariectomized osteoporosis model with diabetes (8, 21, 2629). Based on bilateral oophorectomy, three studies (8, 21, 26) established a diabetes model using an intraperitoneal injection of STZ at doses greater than or equal to 60 mg/kg; three studies (2729) used STZ doses between 30 and 35 mg/kg combined with a high-fat and high-sugar diet. The inappropriate use of high doses of STZ has been associated with increased animal suffering and mortality (46). Previous studies (4648) have shown that doses of 60 mg/kg body weight and above can be harmful or lethal to rats. Therefore, it is inappropriate to inject large doses of STZ in conjunction with major surgical models such as bilateral ovariectomy without concurrently reporting mortality, side effects, and corresponding treatments (8, 21, 26). The multiple dosage usage of STZ in the composite model is detailed in Table 3 (4958). The authors recommend that low-dose STZ or low-dose STZ plus high-fat feeding may be more suitable for composite models. Moreover, it is worth noting that almost all included diabetes models used intraperitoneal instead of intravenous injections of STZ for modeling. This is significant as an accidental delivery of STZ into the sub-peritoneal or bowel space may decrease the success rate and increase the mortality (46, 59). Osteoporosis models with increased bone resorption as the dominant mechanism, including ovariectomized osteoporosis, diabetic osteoporosis, and glucocorticoid models, were used in the present studies. It is suggested that future composite models can be based on other osteoporosis models rather than solely on the ovariectomized osteoporosis model.

Table 3
www.frontiersin.org

Table 3 Discrepancies between blood glucose levels, type of diabetes, and mortality with varying doses of STZ.

The possible mechanisms of Lrg-mediated bone protection from the current findings are summarized as follows: (1) In bone tissue, OPG competitively binds to RANKL, blocking its blinding to RANK on the surface of osteoclasts, thus inhibiting osteoclast maturation (60). Studies indicate that the OPG/RANKL/RANK signaling pathway is increased to counteract bone resorption after Lrg treatment. STAT3 has been identified as a potential target activated by Lrg to upregulate OPG/RANKL (P < 0.05) (26); (2) The levels of OPG, RANKL, and RANK are regulated by a variety of cytokines and hormones that either promote or inhibit osteoclast formation, including parathyroid hormone (61), estrogen (62), 1,25(OH)2D3 (63), TNF-α, and IL-6 (64). Lrg exhibits anti-inflammatory effects by reducing the levels of TNF-α, IL-6, and IL-β (P < 0.05) (8, 34); (3) ROS, a critical factor in bone remodeling and homeostasis, promotes osteoclast differentiation, accelerates bone resorption, and contributes to a reduction in trabecular bone mass (65, 66). It is regulated by protective antioxidant enzymes, such as MDA, SOD, and CAT, which subsequently inhibit RANKL-induced osteoclastogenesis (67). Lrg is reported to reduce ROS and MDA levels (25, 28) and increase SOD, CAT, and GSH (28) (P < 0.05) through the cAMP/PKA/CREB pathway (28); (4) Excessive autophagy can lead to bone cell apoptosis or transition to autophagic death, causing bone metabolism disorders (25). Yang et al. reported that Lrg could inhibit excessive autophagy by reducing the levels of Beclin-1, Atg5, and Map1-LC3-II and increasing the level of p62/SQSTM1 under the intervention of high-dose dexamethasone (25); (5) Wnt3a, an upstream signaling molecule of the classical Wnt signaling pathway, binds with receptor LRP5 to recruit β-catenin into cells and translocate it to the nucleus, subsequently regulating bone proliferation genes and promoting osteoblast proliferation (68, 69). Lrg has been found to increase the levels of Wnt3a, LRP-5, and β-catenin (31). Moreover, activation of AdipoR1 in osteoblasts results in the upregulation of PGC1α, a mitochondrial biogenesis factor, leading to its osteogenic effect. Subhashis et al. reported that Lrg upregulated AdipoR1 and PGC1α through PKA-mediated AMPK stimulation of mitochondrial function in osteoblasts (30). The mechanism diagram is summarized in Figure 9.

Figure 9
www.frontiersin.org

Figure 9 Schematic representation of osteoprotective mechanisms of liraglutide for osteoporosis.

4.4 Conclusion

The pre-clinical evidence reveals that Lrg is capable of partially reversing osteopenia in animal models likely by activating osteoblast proliferation through promoting the Wnt signal pathway and p-AMPK/PGC1α signal pathway and inhibiting the activation of osteoclasts by inhibiting the OPG/RANKL/RANK signal pathway through anti-inflammatory, anti-oxidant, and anti-autophagic pathways. This finding may help to improve the priority of Lrg in the treatment of diabetes patients with osteoporosis.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary Material. Further inquiries can be directed to the corresponding authors.

Author contributions

ZW: Writing – original draft, Writing – review & editing. WD: Writing – original draft, Writing – review & editing. YY: Conceptualization, Data curation, Software, Writing – original draft. JX: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – review & editing. DH: Data curation, Funding acquisition, Methodology, Resources, Supervision, Visualization, Writing – review & editing. YZ: Writing – original draft, Writing – review & editing. QZ: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing.

Funding

The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fendo.2024.1378291/full#supplementary-material

References

1. Kanis JA, Melton LJ, Christiansen C, Johnston CC, Khaltaev N. The diagnosis of osteoporosis. J Bone Miner Res. (1994) 9:1137–41. doi: 10.1002/jbmr.5650090802

PubMed Abstract | CrossRef Full Text | Google Scholar

2. Gregson CL, Armstrong DJ, Bowden J, Cooper C, Edwards J, Gittoes NJL, et al. UK clinical guideline for the prevention and treatment of osteoporosis. Arch Osteo. (2022) 17:58. doi: 10.1007/s11657–022-01061–5

CrossRef Full Text | Google Scholar

3. Lane NE. Epidemiology, etiology, and diagnosis of osteoporosis. Am J Obstet Gynecol. (2006) 194:3–11. doi: 10.1016/j.ajog.2005.08.047

CrossRef Full Text | Google Scholar

4. Chinese Association of Rheumatology and Immunology Physicians, Chinese Rheumatology Association, Chinese Society of Bone and Mineral Research, National Clinical Research Center for Dermatologic and Immunologic Diseases. Chinese consensus on the prevention and treatment of glucocorticoid induced osteoporosis. Zhong Hua Nei Ke Za Zhi. (2021) 60:13–21. doi: 10.3760/cma.j.cn112138–20201102–00914

CrossRef Full Text | Google Scholar

5. Ruiz HH, Díez RL, Arivazahagan L, Ramasamy R, Schmidt AM. Metabolism, obesity, and diabetes mellitus. Arterioscler Thromb Vasc Biol. (2019) 39:166–74. doi: 10.1161/ATVBAHA.119.312005

CrossRef Full Text | Google Scholar

6. Kurra S, Fink DA, Siris ES. Osteoporosis-associated fracture and diabetes. Endocrinol Metab Clin North Am. (2014) 43:233–43. doi: 10.1016/j.ecl.2013.09.004

PubMed Abstract | CrossRef Full Text | Google Scholar

7. Vestergaard P. Discrepancies in bone mineral density and fracture risk in patients with type 1 and type 2 diabetes-a meta-analysis. Osteo Int. (2007) 18:427–44. doi: 10.1007/s00198–006-0253–4

CrossRef Full Text | Google Scholar

8. Chen K, Wu R, Mo B, Yan X, Shen D, Chen M. Comparison between liraglutide alone and liraglutide in combination with insulin on osteoporotic rats and their effect on bone mineral density. J Musculoskelet Neuro Interact. (2021) 21:142–8.

Google Scholar

9. Rizzo M, Abate N, Chandalia M, Rizvi AA, Giglio RV, Nikolic D, et al. Liraglutide reduces oxidative stress and restores heme oxygenase-1 and ghrelin levels in patients with type 2 diabetes: a prospective pilot study. J Clin Endocrinol Metab. (2015) 100:603–6. doi: 10.1210/jc.2014–2291

PubMed Abstract | CrossRef Full Text | Google Scholar

10. Giglio RV, Nikolic D, Volti GL, Stoian AP, Banerjee Y, Magan-Fernandez A, et al. Liraglutide increases serum levels of microRNA-27b, -130a and -210 in patients with type 2 diabetes mellitus: A novel epigenetic effect. Metabolites. (2020) 10:391. doi: 10.3390/metabo10100391

PubMed Abstract | CrossRef Full Text | Google Scholar

11. Patti AM, Rizvi AA, Giglio RV, Stoian AP, Ligi D, Mannello F. Impact of glucose-lowering medications on cardiovascular and metabolic risk in type 2 diabetes. J Clin Med Mar. (2020) 9:912. doi: 10.3390/jcm9040912

CrossRef Full Text | Google Scholar

12. Nikolic D, Patti AM, Giglio RV, Chianetta R, Castellino G, Magán-Fernández A, et al. Liraglutide improved cardiometabolic parameters more in obese than in non-obese patients with type 2 diabetes: A real-world 18-month prospective study. Diabetes Ther. (2022) 13:453–64. doi: 10.1007/s13300-022-01217-z

PubMed Abstract | CrossRef Full Text | Google Scholar

13. Rizzo M, Rizvi AA, Patti AM, Nikolic D, Giglio RV, Castellino G, et al. Liraglutide improves metabolic parameters and carotid intima-media thickness in diabetic patients with the metabolic syndrome: an 18-month prospective study. Cardiovasc Diabetol. (2016) 15:162. doi: 10.1186/s12933–016-0480–8

PubMed Abstract | CrossRef Full Text | Google Scholar

14. Patti AM, Nikolic D, Magan-Fernandez A, Giglio RV, Castellino G, Chianetta R, et al. Exenatide once-weekly improves metabolic parameters, endothelial dysfunction and carotid intima-media thickness in patients with type-2 diabetes: an 8-month prospective study. Diabetes Res Clin Pract. (2019) 149:163–9. doi: 10.1016/j.diabres.2019.02.006

PubMed Abstract | CrossRef Full Text | Google Scholar

15. Giglio RV, Pantea SA, Al-Rasadi K, Banach. M, Patti AM, Ciaccio M, et al. Novel therapeutical approaches to managing atherosclerotic risk. Int J Mol Sci. (2021) 22:4633. doi: 10.3390/ijms22094633

PubMed Abstract | CrossRef Full Text | Google Scholar

16. Patti AM, Giglio RV, Papanas N, Rizzo M, Rizvi AA. Future perspectives of the pharmacological management of diabetic dyslipidemia. Expert Rev Clin Pharmacol. (2019) 12:129–43. doi: 10.1080/17512433.2019.1567328

PubMed Abstract | CrossRef Full Text | Google Scholar

17. Su B, Sheng H, Zhang M, Bu L, Yang P, Li L, et al. Risk of bone fractures associated with glucagon-like peptide-1 receptor agonists’ treatment: a meta-analysis of randomized controlled trials. Endocrine. (2015) 48:107–15. doi: 10.1007/s12020–014-0361–4

PubMed Abstract | CrossRef Full Text | Google Scholar

18. Iepsen EW, Lundgren JR, Hartmann B, Pedersen O, Hansen. T, Jørgensen NR, et al. GLP-1 receptor agonist treatment increases bone formation and prevents bone loss in weight-reduced obese women. J Clin Endocrinol Metab. (2015) 100:2909–17. doi: 10.1210/jc.2015–1176

PubMed Abstract | CrossRef Full Text | Google Scholar

19. Rubino DM, Greenway FL, Khalid U, O’Neil PM, Rosenstock J, Sørrig R, et al. Effect of weekly subcutaneous semaglutide vs daily liraglutide on body weight in adults with overweight or obesity without diabetes: the STEP 8 randomized clinical trial. JAMA. (2022) 327:138–50. doi: 10.1001/jama.2021.23619

PubMed Abstract | CrossRef Full Text | Google Scholar

20. Nuche-Berenguer B, Portal-Núñez S, Moreno P, González N, Acitores A, López-Herradón A, et al. Presence of a functional receptor for GLP-1 in osteoblastic cells, independent of the cAMP-linked GLP-1 receptor. J Cell Physiol. (2010) 225:585–92. doi: 10.1002/jcp.22243

PubMed Abstract | CrossRef Full Text | Google Scholar

21. Wen B, Zhao L, Zhao H, Wang X. Liraglutide exerts a bone-protective effect in ovariectomized rats with streptozotocin-induced diabetes by inhibiting osteoclastogenesis. Exp Ther Med. (2018) 15:5077–83. doi: 10.3892/etm.2018.6043

PubMed Abstract | CrossRef Full Text | Google Scholar

22. Moher D, Liberati A, Tetzlaff J, Altman DG, PRISMA Group. Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. PloS Med. (2009) 6:e1000097. doi: 10.1371/journal.pmed.1000097

PubMed Abstract | CrossRef Full Text | Google Scholar

23. Macleod MR, O’Collins T, Howells DW, Donnan GA. Pooling of animal experimental data reveals influence of study design and publication bias. Stroke. (2004) 35:1203–8. doi: 10.1161/01.STR.0000125719.25853.20

PubMed Abstract | CrossRef Full Text | Google Scholar

24. Lin X, Sun QY, Xu JL. Liraglutide improves bone mineral density in osteoporotic rats by mediating O3a/Wnt signaling. Chin J Endocr Surg. (2022) 16:221–5. doi: 10.3760/cma.j.cn.115807–20211215–00388

CrossRef Full Text | Google Scholar

25. Yang C, Tao H, Zhang H, Xia Y, Bai J, Ge G, et al. TET2 regulates osteoclastogenesis by modulating autophagy in OVX-induced bone loss. Autophagy. (2022) 18:2817–29. doi: 10.1080/15548627.2022.2048432

PubMed Abstract | CrossRef Full Text | Google Scholar

26. Wang X, Mi Y, He W, Yang S, Zhao L, Zhang Y. Effect of liraglutide on regulation of bone metabolism in diabetic osteoporotic rats by activating STAT3. Chin J Osteo Bone Miner Res. (2021) 14:495–503. doi: 10.3969/j.issn.1674–2591.2021.05.007

CrossRef Full Text | Google Scholar

27. Zhang Y, Zhou YH, Li JY, Zhao JL, Wu SY, Xiong CY, et al. Effect of liraglutide on type 2 diabetic osteoporosis rats based on the study of PI3K/Akt pathway. Chin J Osteo. (2021) 27:985–9. doi: 10.3969/j.issn.1006–7108.2021.07.009

CrossRef Full Text | Google Scholar

28. Chong XJ, Yang LX. Mechanism of liraglutide intervening osteoporosis in type 2 diabetic rats through c AMP/PKA/CREB signaling pathways. Chin J Pathophysiol. (2021) 37:1949–56. doi: 10.3969/j.issn.1000–4718.2021.11.004

CrossRef Full Text | Google Scholar

29. Wang Z, Liu J. Effects of liraglutide on microRNA-19a, microRNA-144, and bOne mineral density in osteoporotic rats with type 2 diabetes mellitus. Chin J Osteo. (2020) 26:1297–300. doi: 10.3969/j

CrossRef Full Text | Google Scholar

30. Subhashis P, Shailendra KM, Sourav C, Shyamsundar PC, Konica P, Chirag K, et al. The osteogenic effect of liraglutide involves enhanced mitochondrial biogenesis in osteoblasts. Biochem Pharmacol. (2019) 164:34–44. doi: 10.1016/j.bcp.2019.03.024

PubMed Abstract | CrossRef Full Text | Google Scholar

31. Tang XB, Pan CY, Lou Y. Effects of liraglutide on bone metabolism and Wnt pathway in type 2 diabetic rats with osteoporosis. J Endocr Surge. (2019) 13:466–70. doi: 10.3760/cma.j.issn.1674–6090.2019.06.006

CrossRef Full Text | Google Scholar

32. Zhang L, Li P, Tang Z, Dou Q, Feng B. Effects of GLP-1 receptor analogue liraglutide and DPP-4 inhibitor vildagliptin on the bone metabolism in ApoE-/-mice. Ann Transl Med. (2019) 7:369. doi: 10.21037/atm.2019.06.74

PubMed Abstract | CrossRef Full Text | Google Scholar

33. Yang L, Yang J, Pan T, Zhong X. Liraglutide increases bone formation and inhibits bone resorption in rats with glucocorticoid-induced osteoporosis. J Endocrinol Invest. (2019) 42:1125–31. doi: 10.1007/s40618–019-01034–5

PubMed Abstract | CrossRef Full Text | Google Scholar

34. Hou DL. Study on effects of Liraglutide on bone mineral density and bone brittle degree in rats of high-fat diet inducing obesity and the underlying mechanism. Hebei Med Univ. (2017).

Google Scholar

35. Lu N, Sun H, Yu J, Wang J, Liu M, Zhao L, et al. Glucagon-like peptide-1 receptor agonist Liraglutide has anabolic bone effects in ovariectomized rats without diabetes. PloS One. (2015) 10:132744. doi: 10.1371/journal.pone.0132744

CrossRef Full Text | Google Scholar

36. Zhao Y, Wang Y, Zhang Y, Song DP, Wang QP. The effect of GLP-1 on serum concentrations of OPG and RANKL and bone mineral density in type 2 diabetic rats. Chin J Osteo. (2016) 22:700–5. doi: 10.3969/j.issn.1006–7108.2016.06.009

CrossRef Full Text | Google Scholar

37. Huang SY, Fu JY, Li H, Zhao Y, Li Y, Yang QP. Effects of liraglutide on bone metabolism and bone microstructure in type 2 diabetic rats. Chin J diab. (2016) 24:1111–5. doi: 10.3969/j.issn.1006–6187.2016.12.012

CrossRef Full Text | Google Scholar

38. Pereira M, Jeyabalan J, Jørgensen CS, Hopkinson M, Al-Jazzar A, Roux JP, et al. Chronic administration of Glucagon-like peptide-1 receptor agonists improves trabecular bone mass and architecture in ovariectomised mice. Bone. (2015) 81:459–67. doi: 10.1016/j.bone.2015.08.006

PubMed Abstract | CrossRef Full Text | Google Scholar

39. Yang J, Yang LN, Ding TT, Zhong X, Pan TR. Liraglutide relieves glucocorticoid osteoporosis in rats through autophagy and improvement of oxidative stress. J Anhui Med University. (2020) 55:1724–8. doi: 10.19405/j.cnki.issn1000–1492.2020.11.016

CrossRef Full Text | Google Scholar

40. Rinonapoli G, Pace V, Ruggiero C, Ceccarini P, Bisaccia M, Meccariello L, et al. Obesity and Bone: A complex relationship. Int J Mol Sci. (2021) 22:13662. doi: 10.3390/ijms222413662

PubMed Abstract | CrossRef Full Text | Google Scholar

41. Kilkenny C, Browne WJ, Cuthill IC, Emerson M, Altman DG. Improving bioscience research reporting: the ARRIVE guidelines for reporting animal research. PLoS Biol. (2010) 8:e1000412. doi: 10.1371/journal.pbio.1000412

PubMed Abstract | CrossRef Full Text | Google Scholar

42. Pan YS, Jin AM, Wang MX. Methods and common pitfalls of sample size estimation in clinical studies. Chin J Stroke. (2022) 17:31–5. doi: 10.3969/j.issn.1673–5765.2022.01.004

CrossRef Full Text | Google Scholar

43. Hayes RJ, Bennett S. Simple sample size calculation for cluster-randomized trials. Int J Epidemiol. (1999) 28:319–26. doi: 10.1093/ije/28.2.319

PubMed Abstract | CrossRef Full Text | Google Scholar

44. Wang P, Li Y, Yan B, Yang Z, Li L, Cao Z, et al. Manganese porphyrin promotes post cardiac arrest recovery in mice and rats. Biology. (2022) 11:957. doi: 10.3390/biology11070957

PubMed Abstract | CrossRef Full Text | Google Scholar

45. Brosius FC, Alpers CE, Bottinger EP, Breyer MD, Coffman TM, Gurley SB, et al. Mouse models of diabetic nephropathy. J Am Soc Nephrol. (2009) 20:2503–12. doi: 10.1681/ASN.2009070721

PubMed Abstract | CrossRef Full Text | Google Scholar

46. Goyal SN, Reddy NM, Patil KR, Nakhate KT, Ojha S, Patil CR, et al. Challenges and issues with streptozotocin-induced diabetes - A clinically relevant animal model to understand the diabetes pathogenesis and evaluate therapeutics. Chem Biol Interact. (2016) 244:49–63. doi: 10.1016/j.cbi.2015.11.032

PubMed Abstract | CrossRef Full Text | Google Scholar

47. Sennoune S, Gerbi A, Duran MJ, Grillasca JP, Compe E, Pierre S, et al. Effect of streptozotocin-induced diabetes on rat liver Na+/K+-ATPase. Eur J Biochem. (2000) 267:2071–8. doi: 10.1046/j.1432-1327.2000.01211.x

PubMed Abstract | CrossRef Full Text | Google Scholar

48. Zhuang Z, Wang ZH, Huang YY, Zheng Q, Pan XD. Protective effect and possible mechanisms of ligustrazine isolated from ligusticum wallichii on nephropathy in rats with diabetes: A preclinical systematic review and meta-analysis. J Ethnopharmacol. (2020) 252:112568. doi: 10.1016/j.jep.2020.112568

PubMed Abstract | CrossRef Full Text | Google Scholar

49. GGajdosík A, Gajdosíková A, Stefek M, Navarová J, Hozová R. Streptozotocin-induced experimental diabetes in male Wistar rats. Gen Physiol Biophys. (1999) 18:54–62.

PubMed Abstract | Google Scholar

50. Motyl K, McCabe LR. Streptozotocin, type I diabetes severity and bone. Biol Proced Online. (2009) 11:296–315. doi: 10.1007/s12575–009-9000–5

PubMed Abstract | CrossRef Full Text | Google Scholar

51. Zafar M, Naqvi S, Ahmed M, Kaimkhani ZA. Altered kidney morphology and enzymes in streptozotocin induced diabetic rats. Int J Morphol. (2009) 27:783–90. doi: 10.4067/S0717–95022009000300024

CrossRef Full Text | Google Scholar

52. Saleh DO, Bayoumi AR, El-Eraky WI, El-Khatib AS. Streptozotocininduced vascular and biochemical changes in rats: effects of rosiglitazone vs. Metformin. Bull. Fac Pharm Cairo Univ. (2013) 51:131–8. doi: 10.1016/j.bfopcu.2013.03.002

CrossRef Full Text | Google Scholar

53. Raghunathan S, Tank P, Bhadada S, Patel B. Evaluation of buspirone on streptozotocin induced type 1 diabetes and its associated complications. Biomed Res Int. (2014) 2014:948427. doi: 10.1155/2014/948427

PubMed Abstract | CrossRef Full Text | Google Scholar

54. Tesseromatis C, Kotsiou A, Parara H, Vairaktaris E, Tsamouri M. Morphological changes of gingiva in streptozotocin diabetic rats. Int J Dent. (2009) 2009:725628. doi: 10.1155/2009/725628

PubMed Abstract | CrossRef Full Text | Google Scholar

55. Wang ZS, Xiong F, Xie XH, Chen D, Pan JH, Cheng L. Astragaloside IV attenuates proteinuria in streptozotocin-induced diabetic nephropathy via the inhibition of endoplasmic reticulum stress. BMC Nephrol. (2015) 31:44. doi: 10.1186/s12882–015-0031–7

CrossRef Full Text | Google Scholar

56. Ju Y, Su Y, Chen Q, Ma K, Ji T, Wang Z, et al. Protective effects of Astragaloside IV on endoplasmic reticulum stress-induced renal tubular epithelial cells apoptosis in type 2 diabetic nephropathy rats. Biomed Pharmacother. (2019) 109:84–92. doi: 10.1016/j.biopha.2018.10.041

PubMed Abstract | CrossRef Full Text | Google Scholar

57. Ma KK, Ju YH, Chen QQ, Li WZ, Li WP. Effect of astragaloside IV on regulation of PI3K/akt/foxO1 signal in kidney of type 2 diabetic nephropathy rats. Chin J Exp Tradit Med Formulae. (2019) 25:74–81. doi: 10.13422/j.cnki.syfjx.20190227

CrossRef Full Text | Google Scholar

58. Zhang M, Lv XY, Li J, Xu ZG, Chen L. The characterization of high-fat diet and multiple low-dose streptozotocin induced type 2 diabetes rat model. Exp Diabetes Res. (2008) 2008:704045. doi: 10.1155/2008/704045

PubMed Abstract | CrossRef Full Text | Google Scholar

59. Zaben KRA. Induction of diabetes mellitus in rats using intraperitoneal streptozotocin: a comparison between 2 strains of rats. Eur J Sci Res. (2009) 32:398–402.

Google Scholar

60. Nagy V, Penninger JM. The RANKL-RANK story. Gerontology. (2015) 61:534–42. doi: 10.1159/000371845

PubMed Abstract | CrossRef Full Text | Google Scholar

61. Kužma M, Jackuliak P, Killinger Z, Payer J. Parathyroid hormone-related changes of bone structure. Physiol Res. (2021) 70:3–11. doi: 10.33549/physiolres.934779

PubMed Abstract | CrossRef Full Text | Google Scholar

62. Cheng CH, Chen LR, Chen KH. Osteoporosis due to hormone imbalance: an overview of the effects of estrogen deficiency and glucocorticoid overuse on bone turnover. Int J Mol Sci. (2022) 23:1376. doi: 10.3390/ijms23031376

PubMed Abstract | CrossRef Full Text | Google Scholar

63. Takahashi N, Akatsu T, Sasaki T, Nicholson GC, Moseley JM, Martin TJ, et al. Induction of calcitonin receptors by 1 alpha, 25-dihydroxyvitamin D3 in osteoclast-like multinucleated cells formed from mouse bone marrow cells. Endocrinology. (1988) 123:1504–10. doi: 10.1210/endo-123–3-1504

PubMed Abstract | CrossRef Full Text | Google Scholar

64. Ghosh R, Dey R, Sawoo R, Haque W, Bishayi B. Endogenous neutralization of TGF-β and IL-6 ameliorates septic arthritis by altering RANKL/OPG interaction in lymphocytes. Mol Immunol. (2022) 152:183–206. doi: 10.1016/j.molimm.2022.10.015

PubMed Abstract | CrossRef Full Text | Google Scholar

65. Xian Y, Su Y, Liang J, Long F, Feng X, Xiao Y, et al. Oroxylin a reduces osteoclast formation and bone resorption via suppressing RANKL-induced ROS and NFATc1 activation. Biochem Pharmacol. (2021) 193:114761. doi: 10.1016/j.bcp.2021.114761

PubMed Abstract | CrossRef Full Text | Google Scholar

66. Sendur OF, Turan Y, Tastaban E, Serter M. Antioxidant status in patients with osteoporosis: a controlled study. Joint Bone Spine. (2009) 76:514–8. doi: 10.1016/j.jbspin.2009.02.005

PubMed Abstract | CrossRef Full Text | Google Scholar

67. Hyeon S, Lee H, Yang Y, Jeong W. Nrf2 deficiency induces oxidative stress and promotes RANKL-induced osteoclast differentiation. Free Radical Biol Med. (2013) 65:789–99. doi: 10.1016/j.freeradbiomed.2013.08.005

CrossRef Full Text | Google Scholar

68. Holloway-Kew KL, De Abreu LLF, Kotowicz MA, Sajjad MA, Pasco JA. Bone turnover markers in men and women with impaired fasting glucose and diabetes. Calcified Tissue Int. (2019) 104:599–604. doi: 10.1007/s00223-019-00527-y

CrossRef Full Text | Google Scholar

69. Sebastian A, Hum NR, Murugesh DK, Hatsell S, Economides AN, Loots GG. Wnt co-receptors Lrp5 and Lrp6 differentially mediate Wnt3a signaling in osteoblasts. PloS One. (2017) 12:188264. doi: 10.1371/journal.pone.0188264

CrossRef Full Text | Google Scholar

Keywords: liraglutide, osteoporosis, diabetes, efficacy, possible mechanisms

Citation: Wu Z, Deng W, Ye Y, Xu J, Han D, Zheng Y and Zheng Q (2024) Liraglutide, a glucagon-like peptide-1 receptor agonist, inhibits bone loss in an animal model of osteoporosis with or without diabetes. Front. Endocrinol. 15:1378291. doi: 10.3389/fendo.2024.1378291

Received: 07 February 2024; Accepted: 07 May 2024;
Published: 29 May 2024.

Edited by:

Giacomina Brunetti, University of Bari Aldo Moro, Italy

Reviewed by:

Subhashis Pal, Emory University, United States
Angelo Maria Patti, University of Palermo, Italy

Copyright © 2024 Wu, Deng, Ye, Xu, Han, Zheng and Zheng. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Yu Zheng, 1345562352@qq.com; Qun Zheng, 344457512@qq.com

These authors have contributed equally to this work

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.