Hyeong Jae Kim
Peter C. W. Lee
Jeong Hee Hong- 1Department of Physiology, Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Republic of Korea
- 2Lung Cancer Research Center, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Republic of Korea
With the discovery of the role of the nuclear envelope protein lamin in human genetic diseases, further diverse roles of lamins have been elucidated. The roles of lamins have been addressed in cellular homeostasis including gene regulation, cell cycle, cellular senescence, adipogenesis, bone remodeling as well as modulation of cancer biology. Features of laminopathies line with oxidative stress-associated cellular senescence, differentiation, and longevity and share with downstream of aging-oxidative stress. Thus, in this review, we highlighted various roles of lamin as key molecule of nuclear maintenance, specially lamin-A/C, and mutated LMNA gene clearly reveal aging-related genetic phenotypes, such as enhanced differentiation, adipogenesis, and osteoporosis. The modulatory roles of lamin-A/C in stem cell differentiation, skin, cardiac regulation, and oncology have also been elucidated. In addition to recent advances in laminopathies, we highlighted for the first kinase-dependent nuclear lamin biology and recently developed modulatory mechanisms or effector signals of lamin regulation. Advanced knowledge of the lamin-A/C proteins as diverse signaling modulators might be biological key to unlocking the complex signaling of aging-related human diseases and homeostasis in cellular process.
1 Lamins and laminopathies
Lamins are the inner nuclear membrane proteins, which associate filament assembly in nuclear proteins to contribute the integrity of nuclear envelope and perform various cellular functions, including fibrous organization of the nuclear envelope, gene regulation, cellular senescence, and differentiation (Aaronson and Blobel, 1975; Aebi et al., 1986; Fisher et al., 1986; Goldman et al., 2002; Dechat et al., 2008). The mammalian lamins generally consist of two major types, A and B, encoded by LMNA and LMNB, respectively. The cDNA sequences of lamin-A and its isoform C are similar and comprise alternative splice variants that possess partial amino acid sequence identity, whereas the B-type lamins (Lamin B1 and B2) are different (Fisher et al., 1986; Prokocimer et al., 2009). B-type lamins localize in all types of nuclei and are especially involved in brain organogenesis (Evangelisti et al., 2022; Matias et al., 2022), whereas lamin-A proteins are regulated during development (Prokocimer et al., 2009; Vidal et al., 2012) and are involved in the signaling mechanism of various tissues, including liver tissue, hepatocarcinoma cells (Aebi et al., 1986; Hytiroglou et al., 1993), prostate cancer cells (Kong et al., 2012), fibroblasts (Pekovic et al., 2007), osteoblasts (Akter et al., 2009), and bone marrow-derived mesenchymal stem cells (MSCs) (Bermeo et al., 2015). Structurally, lamin-A/C consists of N-terminal head domain, central coiled-coil rod domain, and C-terminal tail domain including nuclear location signal, and CXXF amino acid-specific motif (Figure 1) (Steinle et al., 2004; Ahn et al., 2019). Nuclear lamin proteins localize inner nuclear membrane to provide nuclear structural maintenance through the interaction with nuclear proteins directly or indirectly (Crisp and Burke, 2008; Prokocimer et al., 2009). In addition, lamin proteins bind to DNA and chromatin to maintain nuclear matrix homeostasis (Luderus et al., 1994; Baricheva et al., 1996). Thus, the features of structure-function crosstalk provide mechanical support of nuclear structure and determination of cellular fate.
FIGURE 1. Structural illustration of lamin-A/C. The lamin-A and its isoform C comprise alternative splice variants. NLS, nuclear location signal.
Since the identification of the lamin-A/C, more than 600 LMNA mutations have been discovered in the human genome and mutations of LMNA mediate defects in nuclear filament assembly and impaired maturation of lamin A (Ho and Hegele, 2019; Lazarte and Hegele, 2021). Its diversities of mutation have been identified in various human diseases such as Hutchinson–Gilford progeria (HGP) syndrome (Mounkes et al., 2003; Goldman et al., 2004), Emery–Dreifuss muscular dystrophy (EDMD) (Bonne et al., 1999), cardiomyopathy (Ben Yaou et al., 2006; Lu et al., 2011), limb-girdle muscular dystrophy type 1 B (Muchir et al., 2003), Dunnigan-type familial partial lipodystrophy (Merideth et al., 2008), and Charcot–Marie–Tooth syndrome type 2B1 (Mounkes et al., 2003). Various studies have addressed the multiple disordered spectra of lamin mutations, which have terms as laminopathies, based on recent advances.
Since lamin-A/C have been addressed as structural “guardians of the soma” (Vidal et al., 2012), various roles of lamins and its modulator signals have been addressed past few decades. Function-associated nuclear structure of lamins and its interacting nuclear molecules (Figure 2) reveal tissue-specific manner and are extensively reviewed (Worman and Schirmer, 2015; Pradhan et al., 2020; Patil and Sengupta, 2021).
FIGURE 2. Structural illustration of lamin-A/C-interacting molecules with filamentous structure. NPC, nuclear pore complexes, LINC, linker of nucleoskeleton and cytoskeleton, LEM domain-containing proteins (Emerin, LAP2, and MAN1), BAF: barrier to autointegration factor, LBR: lamin B receptor, NET: nuclear envelope transmembrane proteins (Patil and Sengupta, 2021).
Genetically, LMNA mutations are also multiple and reveal various disturbed cellular functions. Moreover, dysregulated LMNA gene is often associated with aging and redox homeostasis-associated features. For example, cells from patients with laminopathies reveal the enhanced reactive oxygen species level (Caron et al., 2007; Malhas and Vaux, 2011; Lattanzi et al., 2012). The phenotypic spectrum of laminopathies is very broad because of the high genetic heterogeneity and phenotypic variability and its features seems to share with downstream of aging-oxidative stress. Thus, we focused various roles of lamin-A/C based on its variability throughout the cellular system and summarized recently identified effector signals on lamin-A/C regulation based on the experimental evidences (Figure 3).
FIGURE 3. Various roles of lamin-A/C on multiple cellular systems. Various studies have addressed the multiple disordered spectra of lamin mutations and we summarized the diversity of lamin-A/C function.
2 Cellular roles of lamin-A/C
2.1 Modulation of nuclear morphology and cell cycle
It is well known that lamin plays a role in the morphological and mechanical maintenance of the nuclear shape (Gotzmann and Foisner, 2006; Prokocimer et al., 2009; Worman, 2012). Although the roles of lamins are described in chromatin modulation and highlighted in Drosophila, Xenopus, and Caenorhabditis elegans, we summarized mammalian-based or disease-related lamin-A/C research. It has been well determined the role of lamin in the structural maintenance of chromatin modulation, cellular signaling, cell proliferation, and emerging roles in viral infection (Cenni et al., 2008; Dechat et al., 2008; Parnaik, 2008; Prokocimer et al., 2009; Piekarowicz et al., 2017). Maintenance of lamin shows the modulating sign of cellular fate. Proteolytic cleavage of lamin-A enhances the destruction of the nuclear shape and cellular apoptosis (Rao et al., 1996; Takahashi et al., 1996). Non-cleaved mutants of lamin-A or -B induce abnormal chromatin morphology and delayed apoptosis (Rao et al., 1996). A premature aging disorder, the HGP syndrome is caused by a human lamin-A (LMNA) mutation and presents aged appearances such as osteoporosis and loss of hair (Eriksson et al., 2003). Cells transfected with 50 amino acid-deleted lamin A and HGP syndrome–derived cells (G608G mutation in the LMNA gene) reveal enhanced deformity of the nuclear envelope and chromatin structure (Goldman et al., 2004).
In addition to nuclear maintenance role of lamin, lamin-A/C binds to lamina-associated polypeptide LAP-2α and is anchored to retinoblastoma protein Rb (pRb) (Markiewicz et al., 2002). Depletion of lamin-A/C leads to mislocalization of pRb and pRb protein family p107 and reduced cell cycle arrest in fibroblasts and the human osteosarcoma cell line U2OS (Johnson et al., 2004). Expression of lamin-A/C also regulates the proteasomal degradation of pRb (Johnson et al., 2004; Dorner et al., 2006), suggesting lamin-A/C has a critical role in stability of pRb and modulation of pRb-associated cell cycle. More recently, LMNA existence or mutations affect interaction with binding proteins such as emerin or nesprin-1 (Vaughan et al., 2001; Dilsaver et al., 2018; Sur-Erdem et al., 2020). Homozygous mutation of LMNA at Y259X in fibroblasts reveals an abnormal shape of nuclei and mislocalization of the nuclear protein emerin to the endoplasmic reticulum (Muchir et al., 2003). Overexpression of wild-type lamin-A/C in LMNA-mutated (nonsense Y259X mutation) fibroblasts restores the localization of nuclear membrane proteins emerin and nesprin-1α (Muchir et al., 2003). Emerin and lamins are implicated in cardiac and muscle-related diseases, as well as cancer metastasis (Mislow et al., 2002; Holaska, 2008; Liddane and Holaska, 2021). Additionally, lamin mutations (Lmna knock-out, LmnaN195K, LmnaH222P, LMNAR249W, LMNAG449V, LMNAL489P, LMNAW514R, LMNAR453W, and LMNAR541P) induce rupture of nuclear envelope and DNA damage in skeletal muscles of mouse models and human biopsy samples with LMNA muscular dystrophy (Earle et al., 2020). Although the roles of lamin protein in nuclear morphology and cell cycle regulation are summarized in this section, its categorization is convergent, hence, we separately and more precisely discussed the aging-related role of lamin in next section cellular senescence.
2.2 Cellular senescence
Patients with LMNA mutation, caused by most frequently nucleotide substitution (1824C to T), show accelerated aging, potentially caused by gradual changes in nuclear structure and aberrant lamin-mediated functions such as nuclear organization and assembly (Goldman et al., 2004). Lmna homozygous mutant mice (LmnaL530P/L530P) show a broad range of laminopathy symptoms, such as premature aging appearances including hyperkeratosis, bone loss, and decreased hair follicle density (Mounkes et al., 2003), which are similar to those of patients with progeria. Human fibroblasts with LMNAD47Y, LMNAL92F, LMNAL387V, LMNAR399H, LMNAL421P, and LMNAR482W, which accumulate prelamin-A, also enhance oxidative stress and mediate premature features (Caron et al., 2007). Large scale genome mapping in laminar interaction reveals several linker proteins such as LAP2α, which is associated with telomeres (Dechat et al., 2004; De Vos et al., 2010). Damage to telomeres, the physical ends of chromosomal DNA, activates production of mutant LMNA gene progerin, and induces a broad range of changes in various genes such as cytoskeleton or cell cycle-related genes in JH-1 and JH-2 fibroblast cells (Cao et al., 2011). In addition, during senescence of human MSCs with high passage, nuclear laminar proteins, including lamin-A, exacerbate the production of telomere aggregates (Raz et al., 2008), suggesting that the lamin and telomere complex are involved in nuclear structural organization. Lamins are also involved in the modulation of telomere homeostasis. During the investigation of interaction between telomere dynamics and LMNA mutation, LMNAR133L or LMNAL140R mutations lead to genomic instability and degradation of telomeric repeat-binding factor 2 (TRF2) and accelerate telomere shortening (Saha et al., 2013). It is also identified that its physical interaction between TRF2 and lamin-A/C is required interstitial telomeric loops at chromosome ends (Smith et al., 2018). Lamin-A/C also affects telomere position and long linker region (aa286-488, referred as udTRF2) of TRF2, an essential regulatory domain to interact with lamins (Travina et al., 2021). Telomere shorting or DNA damage is considered the downstream of oxidative stress and subsequent process of cellular senescence (Hutchison, 2011; Sieprath et al., 2012). Thus, cellular and tissue longevity is closely related to functional or structural stability of lamins. Additionally, structural features such as bone loss or enhanced fat mass are associated with aging-related features, we separated the effect of lamin on the differentiation of bone and adipocytes and extensively discuss in Section 3. We summarized the lamin-A/C mutations and its related mechanism (Table 1).
TABLE 1. Summary of lamin-A/C mutations and related mechanisms.
Several studies have addressed that tumor cells possess a mechanism that is protected by cellular senescence, which is considered an onco-suppression process. For example, the involvement of the nuclear envelope protein nestin, which stabilizes lamin-A/C through interaction with the rod domain of nestin, is reported against proteasomal degradation of lamin-A/C in non-small-cell lung carcinoma A549 cells (Zhang et al., 2018). Knockdown of nestin enhances cellular senescence, whereas increased lamin-A/C levels in nestin-null cells reduce cellular senescence (Zhang et al., 2018). The mutant allele at L647R of prelaminar-A as well as the S22A mutant of progerin accelerates tumor cell senescence (Moiseeva et al., 2015). Inoculation of the S22A mutant of progerin into nude mice inhibits tumor progression through impaired mitosis and induces cell senescence (Moiseeva et al., 2015). Cellular senescence is considered as an inhibitory effect on tumor progression; however, it also has both pro- and anti-tumor effects (Campisi, 2013). Although the approach to nuclear lamina protein might be an attractive strategy to investigate the aging process, an anti-tumor strategy through the regulation of cellular senescence should be carefully considered and evaluated in future studies.
2.3 Modulatory roles of lamin on cellular signaling and inflammation
The roles of lamin in gene expression and regulation of transcriptional activity have been extensively reviewed, and diverse roles of lamin have been reported in signal transduction (Zastrow et al., 2004; Broers et al., 2006; Heessen and Fornerod, 2007; Marmiroli et al., 2009). Briefly, lamin-A acts as a binding partner with several signaling molecules, such as c-Fos, and its interaction negatively regulates the activity of the activating protein-1 transcription factor (Ivorra' et al., 2006). Lamin-A also binds to extracellular signal-regulated kinase (ERK)1/2 (Gonzalez et al., 2008) and protein phosphatase PP2Aa (Van Berlo et al., 2005).
In addition, laminopathies on inflammatory signaling are addressed as shown in aging-dependent pathologies (Afonso et al., 2016; Tran et al., 2016). LMNA mutations such as LMNAD47Y, LMNAR133L, and LMNAR482W promote the mRNA expression of inflammatory cytokines such as interleukin (IL)-6, IL-33, and monocyte chemoattractant protein (MCP)-1 in vascular smooth muscle cells (Afonso et al., 2016). LmnaG608G/G608G mice also reveal the enhanced serum IL-6, chemokine C-X-C motif ligand-1, and tumor necrosis factor-α (Osorio et al., 2012). Mice with overexpressed Lmna mutation (G608G) show several inflammatory cytokine genes such as S100A8 (known as myeloid-related protein MRP8), S100A9 (known as MRP14), small proline-rich protein 2D, and IL-1 receptor antagonist in skin (McKenna et al., 2014). Although accumulating evidences reflect the relationship between laminopathies and inflammation, the precise mechanism is still not known. Thus, roles of lamin on inflammatory signaling should be elucidated beyond one of aging-associated phenotypes.
3 Roles of lamin-A/C on aging features
3.1 Adipogenesis in MSC and muscle
In an effort to discover the binding partners of lamins, a yeast two-hybrid screening technique reveals the involvement of sterol response element binding protein 1 (SREBP1) and SREBP2 in mouse adipocyte 3T3-L1 cells (Lloyd et al., 2002). Among SREBP isoforms, SREBP1 is a specific isoform of adipocytes, and lamin-A binds to SREBP1, especially to its N-terminal transcription factor domain (Lloyd et al., 2002). This interaction can be explained by that laminopathy with fat deficiency is caused by a reduced interaction between SREBP1 and lamin-A (Lloyd et al., 2002). Polypeptides of SREBP1 reveal the signal sequence for modulation of localization in the nucleus. Wild type lamin A and its gene variants bind to the SREBP1 signal sequence and cause SREBP1 localization (Duband-Goulet et al., 2011). In addition, as a genetic disorder of Dunnigan-type familial partial lipodystrophy, LMNAR482W fails to regulate SREBP1 activity (Vadrot et al., 2015).
Differentiated cells are required protein farnesylation for adipogenesis, which is differentiation process of white fat into mature adipocytes (Klemm et al., 2001). The inhibition of farnesylation with farnesyltransferase inhibitor (FTI)-277 arrests MSC differentiation, enhances prelamin-A and subsequently reduces SREBP1 expression, peroxisome proliferator activator gamma (PPARγ) expression, and PPARγ activity during bone marrow adipogenesis (Rivas et al., 2007). The role of lamins has also been addressed in osteopenia and sarcopenia through the regulation of adipocyte differentiation (Tong et al., 2011). Lmna-null mice and LmnaH222P/H222P mice show reduced WNT/β-catenin signaling, suggesting that lamins are involved in muscle and bone strength (Le Dour et al., 2017) and defects in lamins enhance adipogenic factors such as PPARγ and fat infiltration in myofibers (Tong et al., 2011). These studies address that the loss of lamin mediates frailty syndrome-related sarcopenia and osteopenia and reflects consistent features of aging (Figure 4).
FIGURE 4. Schematic illustration of aberrantly expressed lamin-A/C in MSCs. Downregulated lamin-A/C induces adipogenesis and aging feature such as osteopenia and sarcopenia. MSC, mesenchymal stem cell; PPARγ, peroxisome proliferator activator gamma.
3.2 Bone remodeling
The HGP syndrome is characterized by premature osteoporosis and reduced bone mass. It was also assumed that the lamin-A/C mutation is involved in osteoblast differentiation. Knockdown of lamin-A/C reduces osteoblastogenetic process of MSCs and reduces osteoblast differentiation markers Runt-related transcription factor 2 (Runx2) and osteocalcin levels as well as alkaline phosphatase activity, whereas it enhances osteoclastogenesis marker protein receptor activator of NF-κB ligand (RANKL)/osteoprotegerin ratio and tartrate-resistant acidic phosphatase (TRAP)-positive staining (Akter et al., 2009; Rauner et al., 2009). Bone remodeling is a coordinated process between osteoblasts and osteoclasts. Impaired osteoblastic function and osteoclastogenesis lead to changes in bone content. Thus, bone formation by osteoblasts and bone resorption by active osteoclasts are essential homeostatic processes in bone remodeling (Kang et al., 2020). Differentiated osteoclasts, also known as osteoclastogenesis, possess bone resorption activity through the stimulation of RANKL and macrophage colony-stimulating factor (Yasuda et al., 1998). Accordingly, reduced lamin-A/C facilitates the process of osteoporosis such as inhibited osteoblastic function, enhanced osteoclastogenesis, and increased bone resorption area (Rauner et al., 2009). Lamin-A/C–deficient animal studies have also addressed the inhibition of osteoblastic differentiation and the reduction in bone formation (Li et al., 2011). Thus, lamin-A/C is required for osteoblast differentiation and normal bone biogenesis (Li et al., 2011; Vidal et al., 2012). LMNA-overexpressing human MSCs enhance osteoblastic differentiation of MSCs, the level of nuclear β-catenin, and its transcriptional activity, whereas knockdown of lamin-A/C with siRNA dramatically reduces nuclear β-catenin levels (Bermeo et al., 2015). In addition, adipocyte differentiation is attenuated by LMNA overexpression in human MSCs (Bermeo et al., 2015). Above all, loss of lamin-A/C mediates reduced osteoblasts differentiation and enhances adipogenic differentiation of MSCs (Figure 5).
FIGURE 5. Schematic illustration of aberrantly expressed lamin-A/C in bone system. Abnormal expression of lamin induces osteoporosis which caused by upregulated RANKL and bone resorption and downregulated osteoblastic function, RunX2, osteocalcin, and phosphatase activity. RANKL, Receptor activator of NF-κB ligand; Runx2, Runt-related transcription factor 2.
3.3 Keratinocyte differentiation
The essential role of lamin-A/C in keratinocyte differentiation has been described in several studies. For example, the HGP syndrome mutation reveals skin phenotypes such as hyperplastic epidermis feature, inflammatory response in dermal layer, and hypodermal fat layer (McKenna et al., 2014) and mice with LmnaG608G mutation reveals abnormal skin development (Sagelius et al., 2008). Knockdown of Akt1 in mouse keratinocytes enhances lamin-A/C expression (Naeem et al., 2015). Degradation of lamin-A/C is prevented by blocking Akt function. Nuclear lamin is retained by preventing phosphorylation at Akt phosphorylation sites, S404 and S301 (Bertacchini et al., 2013). The S301 mutant reveals a reduction in keratinocyte differentiation markers such as loricrin, keratin 1/10, and filaggrin, and enhances the expression of bone morphogenetic protein 2 (BMP2)/Smad1 (Naeem et al., 2015). The terminal differentiation of keratinocytes requires nuclear degradation in the cornified layer of the skin. Thus, the retention of nuclear lamin is involved in parakeratosis, such as enhanced BMP2 signaling, which is observed in psoriasis, eczema, and atopic dermatitis (Sakurai et al., 2002). More recently, it has been addressed that keratinocyte differentiation is required Akt1-dependent nuclear lamin A/C distribution (Rogerson et al., 2021).
Nuclear remodeling is essential process during the keratinocyte differentiation. However, verification of network between nuclear proteins such as lamin-A/C and keratinocyte differentiation has not been extensively studied. Thus, further work is required to determine the precise mechanism of molecular network in various skin diseases. Above all, considering the significance of the differentiation mechanism, the regulatory role of lamin-A/C might be critically associated with chromosomal functions such as regulation of DNA transcription including the maintenance of nuclear envelope. The expression of lamin-A/C is clearly differentially regulated in different tissues and precise verification of lamin modulation in differentiated tissues would be next challengeable issues. We illustrated the role of lamin in keratinocyte differentiation systems (Figure 6).
FIGURE 6. Schematic illustration of lamin-A/C in skin development. Abnormal overexpression of lamin-A/C induces hyperproliferative keratinocyte with upregulated signaling modulators. BMP2, bone morphogenetic protein 2.
3.4 Cardiac maintenance
The involvement of lamin-A/C in the cardiac system has also been investigated in various studies. Gene defects of LMNA reveal abnormal cardiac function and dilated cardiomyopathy (Bonne et al., 1999; Fatkin et al., 1999; Bonne et al., 2000; Ben Yaou et al., 2006; Jacob and Garg, 2006; Sylvius and Tesson, 2006). To understand laminopathies in cardiac tissue, a mutant mouse model of Lmna is developed. Summary of lamin mutations (lamin-null, -mis-sense, -transgenic lines) is addressed (Lu et al., 2011) and is beneficial for understanding various laminopathies. Cardiomyopathy symptoms occur in Lmna-null (Sullivan et al., 1999), LmnaH222P/H222P (Arimura et al., 2005; Muchir et al., 2007; Muchir et al., 2012; Le Dour et al., 2017), LmnaN195K/N195K (Mounkes et al., 2005), and LmnaM371K (Wang et al., 2006) lines. With an effort to discover effects of lamin-A mutation on gene expression with genome-wide expression profiles, the involvement of MAPK and its downstream signaling pathway are reported in the cardiomyopathic laminopathy of LmnaH222P/H222P (Muchir et al., 2007). Moreover, WNT/β-catenin signaling is decreased in LmnaH222P/H222P mice, whereas activation of β-catenin signaling by treatment with 6-bromoindirubin-3′-oxime (6BIO, inhibitor of glycogen synthase kinase 3β) to prevent the destruction of β-catenin enhances cardiac function in Lmna mutant mice (Le Dour et al., 2017). Restoration of β-catenin signaling by 6BIO treatment protects myocardial dysfunction from aging (Guo et al., 2020). Regulation of WNT/β-catenin signaling is a promising strategy against an aging heart with cardiomyopathy (Figure 7). Aging features owing to defects of lamin function could be modulated by the application of potential signaling regulators. In addition, it has been recently addressed that cytoplasmic intermediate filament protein desmin mis-localizes in cardiomyocytes of LmnaH222P/H222P mice (Galata et al., 2018). Overexpression of heat shock protein αB-crystallin rescues cardiomyopathy with Lmna mutation (LmnaH222P/H222P) including desminopathy (Galata et al., 2018). These results indicate that cytoplasmic filament protein desmin is associated with nuclear lamin network in cardiomyopathy and αB-crystallin is suggested to rebuild the cytoskeleton-nucleoskeleton network (Galata et al., 2018; Maggi et al., 2021). Although an overview of the management of cardiac disease in LMNA-associated laminopathy has been provided (Chen et al., 2019; Kirkland et al., 2023; Wang and Dobreva, 2023), treatment of cardiomyopathy caused by laminopathies is remains a challenging issue.
FIGURE 7. Schematic illustration of lamin mutations in cardiac system. Cardiomyopathy symptoms are occurred by misregulation of MAPK and WNT/β-catenin in mutant mouse models of Lmna (Lmna-null, LmnaH222P/H222P, LmnaN195K/N195K, and LmnaM371K).
4 Role of lamin-A/C on oncology
Altered nuclear lamin as an oncogenic signaling pathway has been observed in various cancer tissues. Lamin expression in cancerous tissues is highly diverse. It has been reported that loss of lamin-A/C expression in lung (Machiels et al., 1995) and colon cancer cells, which are different from lamin-A/C expressed hepatic tumor cells (Aebi et al., 1986; Hytiroglou et al., 1993). Knockdown of lamin-A/C using shRNA reveals nuclear morphological deformation of primary breast epithelial cells, be similar to phenotype of cancer cells (Capo-chichi et al., 2011b). In cancer system, it is difficult to define high or low levels of lamin-A/C expression. 47% of ovarian cancer lacks lamin-A/C expression (Capo-chichi et al., 2011a). Non-cancerous ovarian epithelial cells show morphological deformities of nuclear shape with deletion of lamin-A/C using small interfering RNA (Capo-chichi et al., 2011a). In addition to ovarian cancer, 17.8% of colon cancer tissue reveals low lamin-A/C expression, whereas 82.2% of colon cancer shows high lamin-A/C expression (Belt et al., 2011). Gastrointestinal cancers (Wu et al., 2009) such as gastric carcinoma show loss of lamin expression, whereas prostate (Kong et al., 2012; Khan et al., 2018) and breast cancers (Zhang and Lv, 2017) show both characteristics, and colorectal cancer (Willis et al., 2008) reveals different patterns of lamin expression. Thus, in this section, although experimental evidences possess limitation, we highlighted individually the tissue-selective expression pattern of lamin-A/C as a negative or positive regulator of cancers.
Immunohistochemical analysis of lamin reveals that the primary isolated colonic and gastric adenocarcinoma tissues show a reduction or absent in nuclear lamin-A/C and -B1 expression and cytoplasmic detection of lamin (Moss et al., 1999). Other tissues, including cervical squamous carcinoma, uterine adenocarcinoma, prostate adenocarcinoma, breast adenocarcinoma, and non-small cell lung carcinoma, also reveal immunohistochemically reduced or absent lamin expression (Moss et al., 1999). Reduced lamin protein levels are considered a common feature in tumor tissues. Additional experimental evidence is available for gastric carcinomas. mRNA and protein expression in addition to immunohistochemical analysis have revealed reduced expression of lamin-A/C in primary gastric carcinoma (Wu et al., 2009). Additionally, loss of lamin enhances migration in ovarian cancer HO-8910 cells (Wang et al., 2019). As a potential negative biomarker, lamin-A/C can be used for the diagnosis of gastric cancer, colon cancer, or ovarian cancer HO-8910 cell lines.
However, as a risk biomarker, several experimental evidences on lamin expression have revealed the opposite. More recently, although sample size is restricted, deep hybrid machine learning technique is revealed that nuclear A and B type of lamins are newly addressed as potent diagnostic markers of ovarian cancers (Sengupta et al., 2022). Moreover, lamin-A/C is expressed in colonic stem cells and the ectopically expressed lamin-A colorectal cancer cell line SW480 shows enhanced morphological changes and invasive or motile properties (Willis et al., 2008). GFP-tagged lamin-A enhances actin-associated protein T-plastin and reduces cellular adhesive protein E-cadherin in SW480 cells (Willis et al., 2008). As shown in colorectal cancer, Kong et al. reported that enhanced lamin-A/C expression increases the risk of invasive characteristics of prostate cancer through the involvement of the phosphoinositide 3-kinase (PI3K)/Akt signaling pathway (Kong et al., 2012). These results indicate that lamin-A/C–positive colorectal and prostate cancers possess stem cell-like features.
It has been demonstrated that lack of lamin-A/C was revealed in human leukemia cell HL-60 (Paulin-Levasseur et al., 1988), early-stage lymphocytes (Guilly et al., 1990), lymphoblastic leukemia, and non-Hodgkin’s lymphoma cells (Stadelmann et al., 1990). However, more recently, lamin-A/C is expressed in CD30 (+) Reed-Sternberg cells from Hodgkin’s lymphoma, not in CD20 (+) non-neoplastic lymphocytes B (Jansen et al., 1997). Additionally, three-dimensional structure of lamin was identified in Reed-Sternberg cells (Contu et al., 2018).
Several evidences are limitedly provided or experimental cellular states are clearly undefined in oncology. Why does the expression of lamin play different roles in different cancers and is this expression of lamin dependent on the motility of cancer cells? Based on current experimental evidences, type of cancers and cancerous circumstances may reflect lamin expression. Especially, the cell suspension state has been shown to modulate lamin-A/C expression. Suspended breast cancer cells promote reattachment through enhanced lamin-A/C, suggesting that the cellular status may provide a broad spectrum of lamin and cytoskeletal proteins (Zhang and Lv, 2017; Ovsiannikova et al., 2021; Zhao et al., 2022).
Therefore, type of cancer or physical cellular state should be carefully considered on the aspect of laminopathies and the diversity of the role of lamins in various cancers also should be considered in future studies. Above all, although various roles of nuclear lamin-A/C in human diseases are highlighted in this review, potential roles of lamin in human diseases is not limited to several specific issues.
5 Various modulating factors and effector signals on lamin-A/C expression
Understanding the relationship between lamin and signaling modulators might be an effective strategy for various laminopathies-associated pathogenesis, which are currently no therapy strategy. Thus, modulatory mechanism or effector signals of lamin-associated biology are elucidated in this section. Using proteomic-based analysis, the substrates of the serine/threonine kinase Akt are identified as the modulating factor of lamin expression (Cenni et al., 2008). Akt phosphorylates the lamin-A precursor prelamin-A at Ser404 and modulates the transcription of Lmna (Cenni et al., 2008; Bertacchini et al., 2013). Phosphorylation of lamin-A/C at Ser404 is mediated by insulin treatment, whereas no phosphorylation responses to Akt stimulation are triggered in primary fibroblast from patient with LMNAR401C-EDMD2 (Cenni et al., 2008). Its Akt-mediated lamin phosphorylation is critical for lamina degradation. Akt/protein kinase B (PKB) signaling regulates both Lmna and prelamin-A stability (Bertacchini et al., 2013; Rogerson et al., 2021). In contrast, the Akt1-depleted cornified layer restores lamin-A/C expression and mediates parakeratosis, which is abnormal retention of nuclei, in cornified layer (Naeem et al., 2015).
Farnesylation process also regulates lamin-A/C expression. Accumulated farnesylation of prelamin-A is associated with genetic diseases in mice with HGP syndrome mutation LmnaG608G (Yang et al., 2005; Yang et al., 2008). Application of farnesyltransferase inhibitor FTI-277 reduces prelamin-A expression and adipogenic differentiation in bone marrow MSCs (Rivas et al., 2007) and ABT-100 also reduces rib bone fracture and enhances the survival of mice with LmnaG608G (Yang et al., 2008).
In addition to farnesylation, matrix microenvironment influences cellular motility and differentiation. Matrix stiffness and strength modulate lamin expression. The soft matrix phosphorylates lamin-A at Ser22, Ser390, Ser404, and Thr424 (Swift et al., 2013). Matrix stiffness is associated with myosin II activity, and lamin-A/C expression is enhanced by reduced nuclear stress (Buxboim et al., 2014). Reduced stiffness dephosphorylates lamin-A/C at Ser22, which mediates lamina signaling (Buxboim et al., 2014; Virtanen et al., 2023) and differential expression of lamin-A/C as an extracellular matrix-dependent mechanosensor protein has also been suggested (Ovsiannikova et al., 2021; Urciuoli et al., 2021). More recently, phosphorylation of lamin-A/C at Ser22 modulates voltage-gated NaV1.5 channel activity (Olaopa et al., 2021). These results may provide the potent role of lamin on the transitional pattern of adhesion to suspension.
Kinase-dependent lamin-A/C expression is also addressed in several studies. The cyclin-dependent kinase (Cdk) inhibitor RO3306 inhibits the phosphorylation of lamin-A/C and its degradation (Buxboim et al., 2014). The proliferation of vascular smooth muscle cells is affected by cyclic stretching, and its mechanosensitive application modulates nuclear proteins such as emerin and lamin-A/C expression (Qi et al., 2016). Hypertensive mechanical application enhances emerin and lamin-A/C expression, indicating that emerin and lamin-A/C inhibit the hyper-proliferation of vascular smooth muscle cells (Qi et al., 2016). Moreover, nestin depletion leads to the activation of Cdk5, which is involved in the phosphorylation and degradation of lamin-A/C (Zhang et al., 2018). The oncogenic focal adhesion kinase (FAK) is also involved in cellular senescence-related signaling. Inhibition of FAK with its enzymatic inhibitor PF-573228 enhances p53 expression and reduces lamin-A/C expression in lung cancer cells (Chuang et al., 2019). FAK-downregulated p53 expression is related to cellular senescence, and FAK inhibition enhances β-galactosidase activity, which is a cellular senescence marker (Chuang et al., 2019). Thus, modulation of FAK signaling mediates changes in lamin-A/C expression and cellular senescence programs in lung cancer.
As another process of lamin modulation, the lamin structure is cleaved by caspase-6, and the subsequent lamin cleavage induces apoptosis in colon cancer cells (Lee et al., 2006). Recently, cyclic stretch–induced microRNA-214-3p is shown to bind to Lmna and reduces lamin-A/C protein expression, and subsequently induces the apoptosis of vascular smooth muscle cells (Bao et al., 2020). Treatment with dexamethasone is shown to enhance lamin-A/C nuclear content in ataxia telangiectasia fibroblasts (Ricci et al., 2021). More recently, we addressed that histamine-mediated calcium/calmodulin-dependent kinase II activation and reactive oxygen species generation are involved in the enhancement of lamin-A/C expression in lung adenocarcinoma cell line A549 (Kim et al., 2022). We presented a summary of effector signals and molecules on lamin-A/C expression in Table 2 and future detailed investigations could provide the regulatory mechanism of nuclear lamin biology to improve the current knowledge of lamin pathophysiology on cellular and tissue longevity.
TABLE 2. Summary of effector signals and molecules on lamin expression.
6 In conclusion and perspectives
Lamin proteins regulate various nuclear activities that are implicated in the nuclear architecture, cellular senescence, differentiation, and signaling modulation. Lamins also possess attractive roles in numerous cellular mechanisms, such as aging, tumor suppression, maintenance of nuclear shape, and sensing of extracellular matrix stiffness. Although lamin-associated disease features share several oxidative process such as cellular senescence, posttranslational modification of lamin is also affected by oxidative stress (Eaton et al., 2003; Pekovic et al., 2011). Although various experimental evidences are addressed, precise evidences and molecular mechanism still remain verification. Further studies of laminar signaling continue to present several questions and challenges with regard to crosstalk between aging phenotype, differentiation, and cellular redox homeostasis. Moreover, extracellular matrix, cellular stress, and kinase-dependent mechanism are illuminated and gradually developed in lamin modulation. Thus, regulatory signals and treatment drugs for lamin modulation, compositional changes in lamin, and precise and differential roles of lamin in various cancer cells are ongoing issues. Thus, understanding nuclear lamin biology as an attractive decoding tool is the Rosetta stone of cellular longevity-associated human diseases, including aging, redox potential, or modulation of tumorigenesis might provide extended therapeutic applications on human longevity.
Author contributions
JH conceptualized and designed the study. HK collected the referenced articles. JH, PL, and HK drafted the manuscript and JH critically revised the manuscript for important intellectual content. JH and HK drew all schematic animations and developed the Table. JH and PL contributed to the final approval of the version to be published and agrees to be accountable for all aspects of the work and in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.
Funding
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT; NRF-2020R1A4A1016029: PL) and the Gachon University research fund of 2022 (GCU-202206200001: JH).
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
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Keywords: lamin, nuclear envelope, scenescence, redox hemostasis, cell cycle
Citation: Kim HJ, Lee PCW and Hong JH (2023) Overview of cellular homeostasis-associated nuclear envelope lamins and associated input signals. Front. Cell Dev. Biol. 11:1173514. doi: 10.3389/fcell.2023.1173514
Received: 24 February 2023; Accepted: 03 May 2023;
Published: 12 May 2023.
Edited by:
Brian Gabrielli, The University of Queensland, AustraliaReviewed by:
Mary Tsikitis, Biomedical Research Foundation of the Academy of Athens (BRFAA), GreeceSangram Keshari Samal, Regional Medical Research Center (ICMR), India
Copyright © 2023 Kim, Lee and Hong. 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: Jeong Hee Hong, bWluaWNsZW9AZ2FjaG9uLmFjLmty