Yi-Fan Zeng1
Qi-Hao Guo2,3
Xin-Yu Wei2,4
Si-Yu Chen2,4
Sheng Deng2,4
Ji-Jia Liu1Ni Yin1Yan Liu5*
Wen-Jing Zeng2,4*- 1Department of Cardiovascular Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
- 2Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, Hunan, China
- 3Department of Pharmacy, Shengjing Hospital of China Medical University, Shenyang, China
- 4National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
- 5Department of Pharmacy, Hunan Aerospace Hospital, Hunan Normal University, Changsha, Hunan, China
Objective: This meta-analysis aimed to determine the efficacy of curcumin in preventing myocardial ischemia/reperfusion (I/R) injury in animal models.
Methods: Studies published from inception to January 2023 were systematically searched in databases including PubMed, Web of Science, Embase, China’s National Knowledge Infrastructure (CNKI), Wan-Fang database, and VIP database (VIP). The SYRCLE’s RoB tool was used to determine methodological quality. Sensitivity analysis and subgroup analysis were performed when there was high heterogeneity. Publication bias was assessed using a funnel plot.
Results: Thirty-seven studies involving 771 animals were included in this meta-analysis with methodology quality scores ranging from 4 to 7. The results indicated that curcumin treatment significantly improved myocardial infarction size standard mean difference (SMD) = −5.65; 95% confidence interval (CI): 6.94, −4.36; p < 0.01; I2 = 90%). The sensitivity analysis for infarct size showed that the results were stable and reliable. However, the funnel plot was asymmetric. The subgroup analysis included species, animal model, dose, administration, and duration. The results showed that the subgroup dose was statistically significant between subgroups. In addition, curcumin treatment improved cardiac function, myocardial injury enzymes, and oxidative stress levels in animal models of myocardial I/R injury. The funnel plot revealed that there is publication bias for creatine kinase and lactate dehydrogenase. Finally, we performed a meta-analysis of inflammatory cytokines and apoptosis index. The results showed that curcumin treatment downregulated serum inflammatory cytokine levels and myocardial apoptosis index.
Conclusion: This meta-analysis suggests that curcumin has excellent potential for the treatment of myocardial I/R injury in animal models. However, this conclusion needs to be further discussed and verified in large animal models and human clinical trials.
Systematic Review Registration: https://www.crd.york.ac.uk/prospero/, identifier CRD42022383901.
1 Introduction
Acute coronary syndrome (ACS) is estimated to affect more than 7 million people annually, with a significant increase in the number of young people receiving this diagnosis (Gulati et al., 2020; Bhatt et al., 2022). The pathological basis of ACS is the rupture or invasion of coronary atherosclerotic plaque and the secondary complete or incomplete occlusive thrombosis, which fails coronary blood flow to meet the demands of myocardial metabolism, leading to sharp and temporary myocardial ischemia and hypoxia. Reperfusion therapy is the most important and effective treatment strategy known for acute myocardial infarction (AMI) (O'Gara et al., 2013). Reperfusion therapy improves myocardial ischemia and hypoxia, but it also progressively aggravates the myocardial injury and leads to myocardial cell death, which is described as myocardial ischemia/reperfusion (I/R) injury (Pagliaro et al., 2011). Oxidative stress, inflammation, and intracellular Ca2+ overload occur in a time-dependent manner during myocardial I/R injury, ultimately leading to cardiomyocyte death (Hausenloy and Yellon, 2013). Therefore, reducing cardiomyocyte death is an important therapeutic principle for myocardial I/R injury (Heusch, 2020).
The inherent health benefits and hypotonicity of natural products have attracted growing interest worldwide, leading to a remarkable increase in the use of nutraceuticals and dietary supplements. Turmeric, a curry spice originating in India, has attracted increasing attention in recent years for its medicinal properties. Curcumin, an extract of turmeric, is a lipophilic polyphenol with antioxidant, anti-inflammatory, and anti-fibrotic properties (Wang et al., 2012; Kotha and Luthria, 2019). Curcumin was proven to be well tolerated at high oral doses (12 g/d) and was generally considered to be safe (Lao et al., 2006; Gupta et al., 2013; Prasad et al., 2014).
Recent studies have shown that curcumin protects cardiomyocytes from myocardial I/R injury through multiple and diverse mechanisms (Wang et al., 2018a; Mokhtari-Zaer et al., 2018; Wu et al., 2021a; Pawar et al., 2022). Curcumin has been shown to improve cardiac function after myocardial I/R injury by reducing extracellular matrix degradation and inhibiting collagen synthesis via the TGFβ/Smad signaling pathway (Wang et al., 2012). In addition, curcumin attenuates oxidative damage and inhibits cardiomyocyte apoptosis by activating the JAK2/STAT3 signaling pathway, thereby ameliorating myocardial I/R injury (Liu et al., 2017a). Although the molecular mechanisms of curcumin’s cardioprotective effect in myocardial I/R injury have been partially elucidated, they are still insufficient. Therefore, there is still a long way to go before curcumin be used clinically. Furthermore, it is difficult to transfer finding of animal researches into human clinical trials. The first and most important recommendation of Rainer Spanagel’s list of 10 recommendations for improving reproducibility and translation is to perform a preclinical meta-analysis (Spanagel, 2022). Therefore, this preclinical meta-analysis aimed to determine whether curcumin has a cardioprotective role in animal models of myocardial I/R injury.
2 Methods
This meta-analysis has been registered in PROSPERO (ID: CRD42022383901). This study was conducted in Covidence from literature selection to data extraction.
2.1 Search strategy
Six databases, including Web of Science, PubMed, Embase, China’s National Knowledge Infrastructure (CNKI), the Wan-Fang database, and the VIP database (VIP), were searched systematically between database inception and January 2023 without language restrictions. The keywords mainly used were “myocardial infarction”, “myocardial ischemia”, “myocardial I/R″, “myocardial I/R injury”, “myocardial ischemia-reperfusion injury”, “myocardial ischemia-reperfusion”, and “curcumin”.
2.2 Study selection
The included studies met the following criteria: (Bhatt et al., 2022): myocardial I/R injury experimental models: left anterior descending (LAD) ligation, injecting isoprenaline (ISO) intravenously, or endovascular embolization; (Gulati et al., 2020); Treatment: curcumin was the only intervention with a control group receiving placebo fluid or no treatment at all; and (O'Gara et al., 2013) Data: detailed data of the primary or secondary outcomes in the articles.
Exclusion Criteria were as follows: (Bhatt et al., 2022): no detailed data was provided, (Gulati et al., 2020), no animal model, (O'Gara et al., 2013), without a control group, (Pagliaro et al., 2011), Curcumin is not the only intervention, (Hausenloy and Yellon, 2013), in vitro studies, (Heusch, 2020), article types: review, conference abstract, case reports, meta-analysis and clinical trials.
2.3 Data extraction
Two independent reviewers screened relevant articles for titles and abstracts, viewed full texts, and then extracted data from identified studies by Covidnce in the same standard form. The search results were then checked by the third reviewer. Any disagreements therein were resolved with discussion and adjudication by group discussion.
Information extracted includes as follows: (Bhatt et al., 2022): Author information: the first author, publication year, and country; (Gulati et al., 2020); Animal information: species, sex, and sample size; (O'Gara et al., 2013); Animal model: anesthetic and model methods; (Pagliaro et al., 2011); Drug administration: method, dosage, and duration of administration; (Hausenloy and Yellon, 2013); Outcome record: the mean and standard deviation of the primary outcomes. Primary outcomes include myocardial infarction size (IS). Secondary outcomes include left ventricular ejection fraction (LVEF), left ventricular fractional shortening (LVFS), left ventricular developed pressure (LVDP), maximum 1st derivative of developed pressure (dP/dt max), serum creatine kinase (CK), serum creatine kinase-MB (CK-MB), lactate dehydrogenase (LDH), malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), interleukin-1β (IL-1β), interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and apoptosis index. Primary and secondary outcomes were extracted in detail. When different doses of the curcumin were used, data in the highest dose group was extracted. When there are multiple time points after myocardial ischemia, only the last time point is recorded.
2.4 Quality assessment
The quality assessment of the included studies was independently evaluated by two authors using the SYRCLE’s RoB tool (Hooijmans et al., 2014).
2.5 Statistical analysis
The summary statistics were considered by standard mean difference (SMD) and 95% confidence interval (CI). The Cochran Q test and the I2 statistics were used for the study heterogeneity assessment. Different effect models were used according to the heterogeneity. The random effect model was used when I2>50%, on the contrary, the fixed effect model was used. All statistics were analyzed by R (Version 4.2.2). Subgroup analysis and sensitivity analysis were conducted to find the source of heterogeneity. Publication bias was evaluated, when more than 10 studies were included, by funnel plot. p < 0.05 indicated that the difference was statistically significant.
3 Results
3.1 Study selection
Seven hundred and ninety-one articles were involved after the primary retrieval. One hundred and twenty-eight duplicate articles were excluded by Covidence. After carefully reading the abstracts and titles, 579 articles were excluded. Forty-seven studies were excluded after full-text articles were assessed due to articles with unclear data, irrelevant to our topic, the original text being unavailable, and duplicate data. Finally, a total of 37 studies involving 755 animals were included in the present meta-analysis (Nirmala and Puvanakrishnan, 1996; Manikandan et al., 2004; Cheng et al., 2005; Ansari et al., 2007; Tanwar et al., 2010; Zhao et al., 2010; Wu et al., 2011; Duan et al., 2012; Izem-Meziane et al., 2012; Jeong et al., 2012; Kim et al., 2012; Yang et al., 2012; Wang et al., 2013; Yang et al., 2013; Su et al., 2014; Wang et al., 2014; Yao and Jiang, 2014; Xiao et al., 2016a; Geng et al., 2016; Gu et al., 2016; Sun et al., 2016; Liu et al., 2017b; Liu et al., 2017c; Wang et al., 2018b; Chen et al., 2018; Liu et al., 2018; Boarescu et al., 2019a; Li et al., 2019a; Boarescu et al., 2019b; Javanmard et al., 2019; Rahnavard et al., 2019; Li et al., 2020a; Ding et al., 2020; Jo et al., 2020; Wu et al., 2021b; Yan et al., 2021; Zhao et al., 2022). The PRISMA flow diagram is shown in Figure 1.
FIGURE 1. Flow diagram of database searches and study selection.
3.2 Characteristics of included studies
In terms of species, 21 studies used Sprague-Dawley rats, 10 studies used Wistar rats, and 6 studies used C57BL/6 mice. In terms of gender, only 3 studies used female animals and all the others were male. The methods used to establish animal models of myocardial I/R injury included LAD ligation in 26 studies, ISO injection in 10 studies, and coronary microembolization in 1studies.
Curcumin was administered by multiple routines including oral in 20 studies, intraperitoneal in 7 studies, intravenous in 4 studies, and perfused in 6 studies. Additionally, the duration of curcumin treatment varied from 1 min to 12 weeks. The publication year of the included studies varied between 1996 and 2022. Twenty-four of 37 studies were conducted in China, 4 studies in India, 3 studies in Korea, 2 studies each in Iran or Romania, and 1 study each in France or the United States. All the basic information about the included studies in this meta-analysis is shown in Table 1.
TABLE 1. Baseline characteristics of included studies.
The studies included in this meta-analysis scored between 4 and 7 on the quality assessment. The details of the methodological quality of the included literature are shown in Table 2. The brief molecular mechanism by which curcumin protects cardiomyocytes from myocardial I/R injury is summarized in Table 3.
TABLE 2. Quality assessment of included studies by the SYRCLE’s RoB tool.
TABLE 3. The molecular and cellular mechanisms underlying the cardioprotective effect of Curcumin treatment in myocardial ischemia/reperfusion injury.
3.3 Outcome measures
3.3.1 Myocardial infarct size
Twenty-two studies with 447 animals were included in this meta-analysis to evaluate the effect of curcumin on IS (Cheng et al., 2005; Duan et al., 2012; Jeong et al., 2012; Kim et al., 2012; Wang et al., 2013; Geng et al., 2016; Gu et al., 2016; Liu et al., 2017b; Liu et al., 2017c; Li et al., 2019a; Javanmard et al., 2019; Rahnavard et al., 2019; Jo et al., 2020). The result showed that curcumin treatment significantly reduced IS (SMD = −5.65; 95% CI: −6.94, −4.36; p < 0.01; I2 = 90%) in the animal model of myocardial I/R injury (Figure 2A).
FIGURE 2. (A) Forest plot showing cardioprotective effects of curcumin on myocardial infarction size (IS) in myocardial ischemia/reperfusion injury animal model; (B) sensitive analysis of IS; (C) funnel plot of IS.
Due to high heterogeneity, sensitivity analysis, funnel plot, and subgroup analysis were conducted. The result of the sensitivity analysis revealed that omitting a single study did not significantly change the pooled estimate of IS (Figure 2B). However, the funnel plot of IS was asymmetric (Figure 2C). To explore the source of heterogeneity, species, animal models, dose, administration, and duration were included in the subgroup analysis. The results showed that the subgroup dose was statistically significant between subgroups (Table 4). Furthermore, significant decreases in heterogeneity were found in the ISO model and in the administration of perfusion.
TABLE 4. Subgroup analysis of pooled estimates of infarct size.
3.3.2 Cardiac function
To determine the association between curcumin treatment and cardiac function in the animal model of myocardial I/R injury, LVEF, LVFS, LVDP, +dP/dt max, and -dP/dt max were analyzed. Six studies with 183 animals for LVEF and LVFS (Kim et al., 2012; Liu et al., 2018; Li et al., 2019a; Jo et al., 2020; Yan et al., 2021; Zhao et al., 2022), 7 studies with 152 animals for LVDP (Duan et al., 2012; Yang et al., 2012; Wang et al., 2013; Yao and Jiang, 2014; Liu et al., 2017b; Chen et al., 2018; Li et al., 2020a), 9 studies with 187 animals for + dP/dt max (Duan et al., 2012; Kim et al., 2012; Yang et al., 2012; Wang et al., 2013; Yao and Jiang, 2014; Sun et al., 2016; Liu et al., 2017b; Chen et al., 2018; Li et al., 2020a), and 6 studies with 139 animals for -dP/dt max (Kim et al., 2012; Yao and Jiang, 2014; Sun et al., 2016; Liu et al., 2017b; Chen et al., 2018; Li et al., 2020a) were included in this meta-analysis.
As shown in Figure 3, curcumin treatment exhibited a significant improvement in LVEF (SMD = 2.73; 95% CI: 1.68, 3.79; p < 0.01; I2 = 78%; Figure 3A), LVFS (SMD = 2.83; 95% CI: 1.83, 3.82; p = 0.01; I2 = 67%; Figure 3B), LVDP (SMD = 3.59; 95% CI: 2.65, 4.53; p < 0.01; I2 = 68%; Figure 3C), +dP/dt max (SMD = 3.99; 95% CI: 2.73, 5.25; p < 0.01; I2 = 80%; Figure 3D), and -dP/dt max (SMD = 3.80; 95% CI: 3.21, 4.40; p < 0.01; I2 = 0%; Figure 3E). In conclusion, curcumin treatment significantly improved cardiac function in animal models of myocardial I/R injury.
FIGURE 3. Forest plot showing cardioprotective effects of curcumin on LVEF (A), LVFS (B), LVDP (C), +dP/dt max (D), and -dP/dt max (E) in myocardial ischemia/reperfusion injury animal model. LVEF, left ventricular ejection fraction; LVFS, left ventricular fractional shortening; LVDP, left ventricular diastolic pressure; dP/dt max, maximum 1st derivative of developed pressure.
3.3.3 Myocardial enzyme
Then, serum biomarkers of myocardial injury, including CK, CK-MB, and LDH, were analyzed. Twelve studies with 244 animals for CK (Nirmala and Puvanakrishnan, 1996; Ansari et al., 2007; Zhao et al., 2010; Yao and Jiang, 2014; Sun et al., 2016; Chen et al., 2018; Boarescu et al., 2019a; Boarescu et al., 2019b; Javanmard et al., 2019; Rahnavard et al., 2019; Li et al., 2020a; Ding et al., 2020), 6 studies with 94 animals for CK-MB (Su et al., 2014; Boarescu et al., 2019a; Boarescu et al., 2019b; Ding et al., 2020; Jo et al., 2020; Wu et al., 2021b), and 16 studies with 304 animals for LDH (Nirmala and Puvanakrishnan, 1996; Ansari et al., 2007; Zhao et al., 2010; Wu et al., 2011; Wang et al., 2013; Yao and Jiang, 2014; Sun et al., 2016; Wang et al., 2018b; Chen et al., 2018; Boarescu et al., 2019a; Javanmard et al., 2019; Rahnavard et al., 2019; Li et al., 2020a; Ding et al., 2020; Jo et al., 2020; Wu et al., 2021b) were included in this meta-analysis.
As a result, curcumin treatment presented a significant effect on the reduction of serum CK (SMD = −6.84; 95% CI: −9.99, −3.68; p < 0.01; I2 = 92%; Figure 4A), CK-MB (SMD = −3.53; 95% CI: −5.81, −1.25; p < 0.01; I2 = 80%; Figure 4B), and LDH (SMD = −7.07; 95% CI: −9.73, −4.40; p < 0.01; I2 = 91%; Figure 4C) in animals with myocardial I/R injury.
FIGURE 4. Forest plot showing cardioprotective effects of curcumin on CK (A), CK-MB (B), and LDH (C) in myocardial ischemia/reperfusion injury animal model. CK, creatine kinase; CK-MB, creatine kinase isoenzyme; LDH, lactic dehydrogenase.
The result of the sensitivity analysis revealed that the pooled estimate of CK (Figure 5A) and LDH (Figure 5B) was stable and reliable. However, the funnel plots of CK (Figure 5C) and LDH (Figure 5D) were asymmetric, indicating publication bias.
FIGURE 5. Sensitive analysis of CK (A) and LDH (B); funnel plot of CK (C) and LDH (D). CK, creatine kinase; LDH, lactic dehydrogenase.
3.3.4 Oxidative stress levels
MDA is a crucial indicator of tissue oxidative stress and is a degradation product of lipid peroxidation (Idris et al., 2001). CAT level is known to decrease after myocardial I/R injury (Jin et al., 2017). In addition, SOD is an important antioxidant enzyme. To investigate the association between curcumin treatment and oxidative stress levels, MDA, SOD, and CAT were analyzed. Nine studies with 156 animals for serum MDA (Wu et al., 2011; Yao and Jiang, 2014; Liu et al., 2017b; Boarescu et al., 2019a; Boarescu et al., 2019b; Javanmard et al., 2019; Rahnavard et al., 2019; Li et al., 2020a; Wu et al., 2021b), 5 studies with 104 animals for serum SOD (Wu et al., 2011; Yao and Jiang, 2014; Li et al., 2020a; Ding et al., 2020; Wu et al., 2021b), and 5 studies with 70 animals for CAT in heart tissue (Nirmala and Puvanakrishnan, 1996; Manikandan et al., 2004; Ansari et al., 2007; Tanwar et al., 2010; Izem-Meziane et al., 2012) were included in this meta-analysis.
Curcumin treatment significantly decrease MDA (SMD = −7.05; 95% CI: −11.08, −3.02; p < 0.01; I2 = 89%; Figure 6A), increase SOD (SMD = 4.92; 95% CI: 3.10, 6.73; p < 0.01; I2 = 78%; Figure 6B) and CAT (SMD = 4.16, 95% CI: 2.64, 5.69; p = 0.03; I2 = 62%; Figure 6C) in animal models of myocardial I/R injury.
FIGURE 6. Forest plot showing cardioprotective effects of curcumin on MDA (A), SOD (B), and CAT (C) in myocardial ischemia/reperfusion injury animal model. MDA malondialdehyde, SOD superoxide dismutase, CAT catalase.
3.3.5 Inflammation cytokine and apoptosis index
It has been reported that curcumin improves myocardial I/R injury through immunomodulatory effects (Li et al., 2019a). Therefore, we took inflammatory cytokines and myocardial apoptosis index into consideration in this meta-analysis. Four studies with 114 animals for IL-1β (Liu et al., 2018; Boarescu et al., 2019a; Boarescu et al., 2019b; Yan et al., 2021), 4 studies with 110 animals for IL-6 (Wang et al., 2014; Boarescu et al., 2019a; Boarescu et al., 2019b; Yan et al., 2021), and 5 studies with 130 animals for TNF-α (Wang et al., 2014; Liu et al., 2018; Boarescu et al., 2019a; Boarescu et al., 2019b; Yan et al., 2021), and 6 studies with 90 animals for apoptosis index (Izem-Meziane et al., 2012; Yang et al., 2013; Wang et al., 2018b; Liu et al., 2018; Javanmard et al., 2019; Li et al., 2020a) were included in the meta-analysis.
The results demonstrated that curcumin treatment decreased the serum level of IL-1β (SMD = −5.01; 95% CI: −5.81, −4.22; p < 0.01; I2 = 0%; Figure 7A), IL-6 (SMD = −6.67; 95% CI: −12.36, −0.98; p = 0.02; I2 = 96%; Figure 7B), TNF-α (SMD = −5.62; 95% CI: −8.50, −2.74; p < 0.01; I2 = 76%; Figure 7C), and the apoptosis index (SMD = −8.00; 95% CI: −14.18, −1.82; p = 0.01; I2 = 84%; Figure 7D). Our results suggest that curcumin has significant anti-inflammatory and anti-apoptosis effects in myocardial I/R injury.
FIGURE 7. Forest plot showing cardioprotective effects of curcumin on IL-1β (A), IL-6 (B), TNF-α (C), and apoptosis index (D) in myocardial ischemia/reperfusion injury animal model. IL-1β, interleukin-1β; IL-6, interleukin-6; TNF-α, tumor necrosis factor-α.
4 Discussion
4.1 Summary of evidence
A total of 38 studies were included in this meta-analysis, and the results suggested that curcumin significantly reduced the myocardial IS, improved cardiac function parameters, downregulated serum myocardial enzyme, improved antioxidant ability, decreased serum inflammatory cytokines, and myocardial apoptosis index. The subgroup analysis of IS revealed that dose of curcumin may significantly influence its therapeutic effect. In the 50–100 mg/kg group, 8 studies using 100 mg/kg curcumin and 1 study using 80 mg/kg curcumin showed favorable therapeutic effects despite high heterogeneity (94%), suggesting that 100 mg/kg may be the most well-documented effective dose for the treatment of myocardial I/R injury.
In conclusion, our results demonstrated a significant cardioprotective effect of curcumin at multiple levels in animal models of myocardial I/R injury. This result provided a solid theoretical basis for subsequent large animal studies and human clinical trials.
4.2 Molecular mechanisms
The basic pathological processes of myocardial I/R injury include in inflammation, oxidation stress, cardiomyocyte apoptosis, etc (Schirone et al., 2022). Curcumin has been reported to exert anti-inflammatory, anti-apoptosis, antioxidant, and anti-fibrosis properties (Li et al., 2020b). To better understand the of cardioprotective effect of curcumin in myocardial I/R injury, we summarized its molecular mechanism.
Curcumin reduces myocardial I/R injury through multiple molecular mechanisms, including reducing NF-κB activation (Yeh et al., 2005a; Yeh et al., 2005b), activating the JAK2/STAT3 (Jeong et al., 2012; Liu et al., 2017b) and activating the PI3K/AKT/mTOR signaling pathway (Wu et al., 2021a). In rabbit myocardial I/R injury model, curcumin treatment can significantly inhibit NF-κB activity in myocardial cells, resulting in the downregulation of pro-inflammatory genes such as IL-6, TNF-α, and MCP1, and activation of MMPs (Yeh et al., 2005a; Yeh et al., 2005b). Curcumin activated JAK2/STAT3 pathway, reduced oxidative damage, and inhibited myocardium apoptosis, which improved the myocardial IS in turn (Jeong et al., 2012; Liu et al., 2017b). Further study has implicated pro-surviving pathway of PI3K/Akt/mTOR and MAPK was activated by curcumin, resulting in reduction of myocardial cell apoptosis, and inhibition of inflammation and oxidative stress (Wu et al., 2021a).
Sirtuin 1 (SIRT1), a nicotinamide adenine dinucleotide (NAD)+-dependent histone deacetylase, regulates cell stress, energy metabolism, and cell apoptosis through the deacetylation of specific substrate proteins such as NF-κB, FOXO1, TP53, and AMPK, and thus plays a cardiovascular protective role (Yang et al., 2013; Xiao et al., 2016b; Li et al., 2019b; Ren et al., 2020; Aziz et al., 2022). The upregulation and activation of SIRT1 by curcumin pretreatment have been reported to attenuate the mitochondrial oxidative damage, myocardial enzyme levels, and myocardial apoptosis induced by myocardial I/R injury (Yang et al., 2013). Myocardial cells that die after myocardial I/R injury lose their cell membrane integrity, and a measurable infarct area occurs (Liu et al., 2017c). Curcumin maintains mitochondrial membrane stability and reduces mitochondrial oxidative damage by activating SIRT1 (Yang et al., 2013).
Myocardial fibroblasts and macrophages play vital roles in cardiac repair and remodeling after myocardial infarction and affects the prognosis of patients (Prabhu and Frangogiannis, 2016; Wang et al., 2023). Pro-inflammatory cytokines (such as IL-1β and TNF-α) were thought to promote cardiac fibrosis by inducing the expression of TGF-β in fibrogenic macrophages. The expression of IL-18, a pro-inflammatory cytokine, were increased in MI, resulting in upregulation of TGF-β, inflammatory activation, and activation of SMAD2/3 which eventually activated cardiac fibrosis. Curcumin pretreatment inhibited the pro-fibrotic TGFβ1-SMAD2/3 signaling pathway and then improve cardiac fibrosis and cardiac function after MI (Zhao et al., 2022). In addition, TGFβ1-SMAD2/3 signaling can improve cardiac repair after myocardial infarction by inducing myocardial fibroblasts to express CTHRC1 and then selectively activate WNT5A signialing pathway (Wang et al., 2023).
Oxidative stress is involved in the entire process of myocardial I/R injury (Mokhtari-Zaer et al., 2018). Excessive production of reactive oxygen species (ROS) is generally toxic to cells, causing damage to all components of the cell, such as DNA, proteins, and lipids (Bagheri et al., 2016). Therefore, reducing oxidative stress is a strategy to deal with myocardial I/R injury. Curcumin not only protects cardiomyocyte from hypoxia/reoxygenation (H/R) damage by inhibiting the MAPK signaling pathway and Notch pathway to reduce ROS levels (Wei et al., 2019; Zhu et al., 2019), but also alleviates hyperglycemic-induced H9c2 damage by activating Nrf2/HO-1 signaling pathway to reduce ROS production (Wu et al., 2022).
4.3 Implications
Animal researches are limited by design variations and methodological flaws. In addition, publication bias also limits the clinical translation of animal studies because positive experimental results are easier to publish (van der Worp et al., 2010). Studies have shown that preclinical animal meta-analysis help the translation of research results from animal findings to clinical trials (Sena et al., 2014). Moreover, the rigor and reproducibility of preclinical animal studies varied greatly. Thus, it is of great importance and necessity to improve the rigor and reproducibility of preclinical research on cardioprotection (Bøtker et al., 2018; Lecour et al., 2021). The consortium for preclinicAl assESsment of cARdioprotective therapies (CAESAR) develops a multicenter, randomized, controlled, clinical trial-like infrastructure to address these problems (Jones et al., 2015). We are looking forward to finding more high-quality preclinical studies under CAESAR.
The results of this study showed that curcumin significantly reduces myocardial IS, improves cardiac function, downregulates myocardial enzyme levels, inhibits oxidative stress, decreased serum inflammatory cytokines, and myocardial apoptosis index to play a cardioprotective role in animal models of myocardial I/R injury. However, the results of this study only used the target animal model and did not include animal models with multiple coexisting diseases, which may differ from the pathology of patients in the actual clinical setting. Although high heterogeneity exists, our results still suggest that curcumin is effective in myocardial I/R injury, and this study can provide a solid theoretical basis for further clinical trials.
4.4 Limitations
Firstly, only small animals were used in the included studies. There is a lack of evidence in larger animals. According to the criteria of IMproving Preclinical Assessment of Cardioprotective Therapies (IMPACT) (Lecour et al., 2021), large animal models were the final step of validation to be considered before clinical tests. Therefore, our results might be limited by the lack of large animal models. In addition, most studies used only male animals due to a higher model success rate. Secondly, the heterogeneity in IS, LVDP, CF, CK, CK-MB, and LDH was relatively high. Besides, significant publication bias was found for CK and LDH. Therefore, there is a possibility that the efficacy of curcumin may be overestimated. Finally, all included studies were carried out in target animal models, which were inconsistent with complex cardiovascular comorbidities (such as diabetic hypertension and hyperlipidemia) of patients with myocardial I/R injury in a real-world clinical setting (Andreadou et al., 2021). These factors will greatly limit the extrapolation of our results to clinical translation.
5 Conclusion
This meta-analysis suggests that curcumin has excellent potential for the treatment of myocardial I/R injury in animal models. However, this conclusion needs to be further discussed and verified in large animal models and human clinical trials.
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
Y-FZ and Q-HG drafted the manuscript. Y-FZ and W-JZ designed the study. W-JZ, NY, and YL revised the manuscript. X-YW, S-YC, and SD were responsible for the collection of data. Y-FZ and J-JL were responsible for data analysis. All authors listed have made a substantial, direct, and intellectual contribution to the work and approved it for publication.
Funding
This study was supported by the National Natural Science Foundation of China (No. 81903663), and the Hunan Provincial Natural Science Foundation of China (No. 2020JJ5944).
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.
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Keywords: curcumin, myocardial ischemia/reperfusion injury, myocardial infarction, preclinical evidence, meta-analysis
Citation: Zeng Y-F, Guo Q-H, Wei X-Y, Chen S-Y, Deng S, Liu J-J, Yin N, Liu Y and Zeng W-J (2023) Cardioprotective effect of curcumin on myocardial ischemia/reperfusion injury: a meta-analysis of preclinical animal studies. Front. Pharmacol. 14:1184292. doi: 10.3389/fphar.2023.1184292
Received: 11 March 2023; Accepted: 09 May 2023;
Published: 22 May 2023.
Edited by:
Daniel Fernandes, Federal University of Santa Catarina, BrazilReviewed by:
Fahrul Nurkolis, State Islamic University of Sunan Kalijaga (UIN Sunan Kalijaga Yogyakarta), IndonesiaGollapalle L. Viswanatha, Consultant, Bengaluru, India
R. Laura Vicente Vicente, University of Salamanca, Spain
Copyright © 2023 Zeng, Guo, Wei, Chen, Deng, Liu, Yin, Liu and Zeng. 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: Wen-Jing Zeng, emVuZ3dlbmppbmc4OUBjc3UuZWR1LmNu; Yan Liu, bHkxODk3NDkxNTk5M0AxNjMuY29t