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Abstract

Background

Myocardial ischemia/reperfusion (I/R) injury refers to myocardial tissue damage caused by blood reperfusion after acute heart ischemia caused by coronary artery thrombosis and others. This process is closely related to inflammation and endoplasmic reticulum (ER) stress, and there is currently no ideal prevention means. In recent years, some traditional natural plant products with anti-inflammatory and anti-ER stress properties have been used to counteract myocardial I/R injury. Eupatilin (EPT), a pharmacologically active flavone derived from the Artemisia plant species, possesses significant anti-inflammatory and anti-ER stress activity. Still, its protective effect against myocardial I/R injury in vivo has not been revealed.

Objectives

This study aimed to evaluate EPT’s effect and potential mechanism against myocardial I/R injury.

Materials and Methods

The rat myocardial I/R injury model was prepared and treated with EPT. Then, the levels of myocardial injury markers and hematoxylin and eosin staining were used to evaluate the pathological damage of the myocardial tissue. Western blotting was used to detect the expression of key proteins in the potential signaling pathways.

Results

It was found that EPT could significantly reduce the levels of myocardial injury markers lactate dehydrogenase and creatine kinase, decrease the levels of inflammatory factors, and reduce apoptosis and pathological damage in myocardial tissue. In addition, the expression of key proteins in purinergic P2x7 receptor (P2X7R)/NOD-, LRR- and pyrin domain-containing protein 3 (NLRP3), Janus kinase 2 (JAK2)/signal transducer and activator of transcription 3 (STAT3)/suppressor of cytokine signaling 3 (SOCS3) pro-inflammatory pathways, and pancreatic endoplasmic reticulum eIF2alpha kinase (PERK/eIF2α)/activating transcription factor 4 (ATF4)/C/EBP homologous protein (CHOP) ER stress pathway was significantly downregulated in the EPT-treated group. Molecular docking simulations showed that this may be associated with the fact that EPT can bind to P2X7R, PERK, and other proteins in the aforementioned pathways.

Conclusion

This study demonstrated that EPT could attenuate myocardial I/R injury in rats, and the protective mechanism was related to the ability of EPT to bind to the initiating proteins of the P2X7R/NLRP3 pro-inflammatory pathway and the PERK/eIF2α/ATF4/CHOP ER stress pathway, which inhibited the inflammatory response and ER stress, thus reducing cardiomyocyte apoptosis. Our findings provide some valuable references for the future application of EPT in treating myocardial I/R injury.

Keywords

Apoptosis endoplasmic reticulum stress pathway eupatilin molecular docking myocardial ischemia/reperfusion injury pro-inflammatory pathway

Introduction

With the improvement of living standards and the aging of the population, the incidence of coronary heart disease is on the rise (Syme & Guralnik, 2022), and acute myocardial infarction is its most serious clinical manifestation, which often causes sudden death (Bui & Waks, 2018). At present, the treatment of acute myocardial infarction of coronary heart disease is mainly through arteriovenous thrombolysis, percutaneous coronary angioplasty, coronary artery bypass grafting, coronary artery bypass grafting surgery, and cardiac surgery (Reddy et al., 2015), which can prevent myocardial death due to sustained ischemia and hypoxia, and reduce the infarct area. However, it has been found that as the blood vessels are reopened when the myocardium regains blood supply after a sustained period of ischemia, additional cell death occurs due to pH alterations, oxidative stress, cellular inflammation, endoplasmic reticulum (ER) stress, and other factors that cause further damage to myocardial tissues, a pathologic process known as myocardial ischemia/reperfusion (I/R) injury (Turer & Hill, 2010).

There is still no effective therapy for myocardial I/R injury (Hausenloy & Yellon, 2013), and additive cardioprotective interventions are advocated, including some mechanical and pharmacological approaches. Recent studies indicated that some traditional natural plant products showed obvious protective effects against myocardial I/R injury, benefitting from their excellent anti-inflammatory and anti-apoptotic properties, such as curcumin (Mokhtari-Zaer et al., 2019), polysaccharide fucoidan (Omata et al., 1997), quercetin (Zhang, Zhang et al., 2020), and ginsenosides (Wu et al., 2011). Eupatilin (EPT), a natural product extracted from Artemisia Linn. plant species (Nageen et al., 2018), has efficient anti-inflammatory (Choi et al., 2011) and anti-ER stress properties (Wang et al., 2024). It has shown a favorable potential to protect against I/R injury in other organs, such as the liver (Lee et al., 2016) and kidney (Jeong et al., 2015), but its protective effect on myocardial I/R injury has not been revealed. Therefore, the preliminary aim of this study is to verify the protective effect of EPT against myocardial I/R injury.

In addition, in order to reveal this potential role of EPT more clearly, this study also intends to continue to explore the underlying mechanisms in depth. Previous studies have shown that the activation of NOD-, LRR- and pyrin domain-containing protein 3 (NLRP3) inflammasome can exacerbate myocardial I/R injury (Wu et al., 2020), and targeting and inhibiting this inflammatory response is a potential target pathway to attenuate myocardial I/R injury (Ghafouri-Fard et al., 2022; Shen et al., 2022; Wang et al., 2020). Zhang, Huang et al. (2020) found that metformin could counteract myocardial I/R injury by inhibiting the NLRP3 pathway. Consistently, betulin (Yu et al., 2021) and luteolin (Zhang et al., 2017) showed similar mechanisms in counteracting myocardial I/R injury. This suggests that evaluating the regulatory role of EPT on the NLRP3 inflammatory pathway is a vital link to revealing its potential protective mechanism against myocardial I/R injury. In addition, ER stress is another important process that contributes to cardiomyocyte apoptosis and causes I/R injury; therefore, it is also one of the biological response processes that need to be targeted and inhibited when mitigating myocardial injury (Wu et al., 2016; Zhu & Zhou, 2021). Therefore, exploring the role of EPT in regulating the ER stress pathway will also be helpful in clarifying its protective effect against myocardial I/R injury.

Therefore, on the basis of the above previous studies and the above hypothesis, the present study was proposed to conduct the myocardial I/R injury rat models and treat them with EPT, subsequently evaluating the protective effect of EPT against myocardial I/R injury by detecting cardiomyocyte injury markers, myocardial histopathological changes, and cardiomyocyte apoptosis. Furthermore, the study also intended to reveal the potential mechanism of the protective effect of EPT against myocardial I/R injury by exploring its regulatory effect on the pro-inflammatory pathways, such as purinergic P2x7 receptor (P2X7R)/NLRP3, and ER stress pathway, such as pancreatic endoplasmic reticulum eIF2alpha kinase (PERK/eIF2α)/activating transcription factor 4 (ATF4)/C/EBP homologous protein (CHOP), in myocardial tissues, and by exploring the regulatory effects of EPT on ER stress signaling pathway such as PERK/eIF2α/ATF4/CHOP in myocardial tissues. In addition, in order to further explore the regulation mechanism of EPT on the above pathways, this study also used the molecular docking method to simulate the binding of EPT to key proteins in P2X7R/NLRP3 and PERK/eIF2α/ATF4/CHOP pathways; it will also contribute to revealing the protective mechanism of EPT on myocardial I/R injury.

Materials and Methods

Ethics Statement

The animal experiments were strictly adhered to the international regulations on the welfare of experimental animals and carried out under the approval of the Animal Care and Use Committee.

Materials and Reagents

EPT was obtained from Yuanye Biotechnology Company (Shanghai, China), No. B21568. Enzyme-linked immunosorbent assay (ELISA) kits used for the measurement of serum biochemical parameters (lactate dehydrogenase (LDH), creatine kinase (CK)-MB, tumor necrosis factor alpha (TNF-α), interleukin (IL)-1β, IL-6, monocyte chemoattractant protein-1 (MCP-1)) were obtained from Jiancheng Bioengineering Company (Nanjing, China). The antibodies against p-JAK2, Janus kinase 2 (JAK2), Caspase-1, p-PERK, p-eIF2α, CHOP, glycolytic glyceraldehyde-3-phosphate dehydrogenase (GAPDH) proteins were obtained from Cell Signaling Technology (Danvers, MA, USA); antibodies against suppressor of cytokine signaling 3 (SOCS3), P2X7R, NLRP3, IL-18, Bax, Bcl-2, GRP78, ATF4 proteins were obtained from Abcam Company (Cambridge, UK); antibodies against STAT3, IL-1β were obtained from BOSTER Biological Technology Co., Ltd. (Wuhan, China).

I/R Rat Model Preparation and EPT Treatment

Male Wistar rats (180–210 g) were kept in an animal house at 23 ± 2°C, with free access to food and water and 12 h of light exposure daily. Sixty rats were randomly divided into four groups: the sham operation group (Sham), the IR model group, the 10 mg/kg low-dose EPT-treated group (I/R + EPT 10), and the 20 mg/kg high-dose EPT-treated group (I/R + EPT 20), 15 each. EPT dissolved in 0.5% CMC-Na. Rats in the I/R + EPT 10 and I/R + EPT 20 groups were gavaged 10 mg/kg or 20 mg/kg of EPT daily for 1 week, while rats in the I/R group and Sham group were gavaged with an equal amount of 0.5% CMC-Na solution.

Then the I/R rat model was made according to the previous research, 1 h after the last administration (Lv et al., 2021). Briefly, rats were anesthetized with 2.5% sodium pentobarbital. Then all rats were fixed in the supine position. Rats in the I/R, I/R + EPT 10, and I/R + EPT 20 groups underwent I/R surgery: the left anterior descending coronary artery (LAD) was ligated with a 6-0 silk for 30 min, and ischemia was confirmed by discoloration of the cardiac surface and elevation of the ST segments recorded by electrocardiogram (ECG). The LAD ligature was then loosened and reperfused for 180 min, and reperfusion was confirmed by reddening of the cardiac surface and ST lowering recorded by ECG, and the I/R rat model was completed. Rats in the Sham group received the same surgical procedure treatment, but the LAD was threaded but not ligated. Then, blood was collected from the abdominal aorta of each group, rats were sacrificed by cervical dislocation, and heart tissue was collected.

Measurement of Serum Biochemical Parameters

The blood samples collected in section “I/R Rat Model Preparation and EPT Treatment” were centrifuged, and the levels of serum cardiac enzyme (LDH, CK-MB) and inflammatory cytokines (TNF-α, IL-1β, IL-6, MCP-1) were measured according to the requirements of the ELISA kits for LDH, CK-MB, TNF-α, IL-1β, IL-6, and MCP-1, respectively.

Histopathological Analysis of Myocardial Tissue

Hematoxylin and eosin (H&E) staining was used to analyze the histopathological changes in the myocardial tissue. The left ventricular region of the heart tissue obtained in section “I/R Rat Model Preparation and EPT Treatment” was fixed in 4% paraformaldehyde for 24 h. The tissue was sequentially dehydrated, transparent, and embedded, and then 5 µM sequential slices were cut using a continuous slicer. The slices were sequentially placed into hematoxylin staining solution and eosin staining solution for staining, and the pathological changes of myocardial tissues were observed with an inverted fluorescence microscope.

Measurement of the Cell Apoptosis in Myocardial Tissue

The terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay was used to measure the apoptosis rate of cardiomyocytes. Briefly, after myocardial tissue sections were deparaffinized, they were incubated in the working solution containing proteinase K, followed by membrane rupture using a membrane-breaking working solution. Then they were incubated for 60 min using a buffer solution containing TDTase and dUTP. The nuclei of the cells were re-stained with 4’,6-diamidino-2-phenylindole (DAPI), and the results of the cell apoptosis in myocardial tissue were observed under a fluorescence microscope.

Western Blot Analysis

Myocardial tissue from section “I/R Rat Model Preparation and EPT Treatment” was homogenized, and the total protein was obtained by centrifugation of the homogenate with RAPI lysate. The protein concentration was measured by the bicinchoninic acid (BCA) method. Then the protein samples were sequentially separated by SDS-PAGE, and the sample further underwent membrane transfer and membrane sealing treatment. The protein membranes were then incubated in an incubation solution containing the primary antibody against the corresponding proteins (including GAPDH) at 4°C overnight. Then the membranes were incubated in an incubation solution containing the secondary antibody, and the optical density of the proteins was analyzed by Image Lab software (Bio-Rad, Richmond, CA, USA).

Molecular Docking

The procedure of molecular docking was carried out according to earlier research (Muhammed & Aki-Yalcin, 2024; Yang et al., 2023). Briefly, the structure of EPT was obtained from the Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform (TCMSP) database (http://lsp.nwu.edu.cn/tcmsp.php) and PubChem database (https://pubchem.ncbi.nlm.nih.gov/). The three-dimensional structures of P2X7R, GRP78, and PERK proteins were obtained from the Research Collaboratory For Structural Bioinformatics Protein Data Bank (RCSB) Protein Data Bank (http://www.rcsb.org/) and the UniProt database (https://www.uniprot.org/). Then AutoDock tools (https://autodock.scripps.edu/) were used for molecular docking, and Open Babel software (http://openbabel.org/) and PyMOL software (https://pymol.org/2/) were used to visualize the molecular docking results.

Statistical Analysis

The experimental data were analyzed statistically using SPSS 25.0 software (SPSS Inc., Chicago, IL, USA), and Tukey’s method in one-way analysis of variance (ANOVA) was used to analyze the significance, and the difference was considered to be statistically significant when p < .05.

Results

EPT Attenuated Myocardium Damage Caused by I/R in Rats

As shown in Figure 1, the levels of LDH and CK, the biomarkers of myocardial injury, were remarkably increased in the I/R group. As expected, EPT treatment could inhibit the upregulation of these two biomarkers caused by I/R (Figure 1A–B, p < .01). H&E staining showed that the myocardial tissue of rats was obviously damaged, as the myocardial cells were swollen, disorganized, and infiltrated with a large number of inflammatory cells. Whereas the myocardial tissue damage of rats in the I/R + EPT groups was obviously reduced by EPT treatment, and the effect was more obvious as the dose of EPT increased (Figure 1C). These observations indicated that EPT could attenuate myocardium damage caused by I/R in rats.

Figure 1.

Notes: I/R group compared with the control group: ^##p < .01.

EPT Attenuated Inflammation Response Caused by I/R in Rats

Figure 2 showed that the serum levels of inflammation factors were remarkably increased in the I/R group. As expected, the levels of TNF-α, IL-1β, IL-6, and MCP-1 were remarkably decreased in the I/R + EPT groups (Figure 2A–D, p < .01). These measurements indicated that EPT could attenuate the inflammation response caused by I/R in rats.

Figure 2.

Notes: I/R group compared with the control group: ^##p < .01.

The Inhibition of P2X7R/NLRP3 and JAK2/STAT3/SOCS3 Pro-inflammation Pathway by EPT in the Myocardial Tissue of I/R Rats

As shown in Figures 3 and 4, the two inflammation-related pathways, P2X7R/NLRP3 and JAK2/STAT3/SOCS3, were obviously activated in the I/R model group, as the key proteins in these pathways were remarkably upregulated (Figures 3 and 4, p < .01). As indicated, EPT suppressed the expression of the key proteins in the pro-inflammation pathways, as the levels of P2X7R, NLRP3, Caspase-1, or the ratio of the activated (phosphorylation-modified) JAK2 and STAT3, were significantly downregulated in the I/R + EPT groups (Figures 3B–F and 4B–D, p < .05). These measurements indicated that EPT could inhibit the P2X7R/NLRP3 and JAK2/STAT3/SOCS3 pro-inflammation pathway in the myocardial tissue of I/R rats.

Figure 3.

Notes: Ischemia/Reperfusion (I/R) group compared with the control group: ^##p < .01.

Figure 4.

Notes: I/R group compared with the control group: ^##p < .01.

EPT Reduced Cell Apoptosis in the Myocardial Tissue of I/R Rats

Figure 5 showed that the expression of apoptosis-related proteins changed significantly, as the levels of Bax and activated Caspase-3 (cleaved Caspase-3), the upregulation of which is often associated with increased cell apoptosis, were remarkably upregulated (Figure 5A–D, p < .05). As expected, the drastic changes in the levels of these apoptosis-related proteins are partially reversed in the I/R + EPT groups (Figure 5A–D, p < .05). The TUNEL assay also indicated that EPT could reduce cell apoptosis in the myocardial tissue of I/R rats. As shown in Figure 5E–F, the rate of cell apoptosis was significantly decreased in the I/R + EPT groups (p < .05).

Figure 5.

Notes: I/R group compared with the control group: ^##p < .01.

The Inhibition of PERK/eIF2α/ATF4/CHOP ER Stress Signaling Pathway by EPT in the Myocardial Tissue of I/R Rats

Figure 6A–B showed that the level of GRP78, the marker of ER stress, was remarkably increased in the I/R group, but such upregulation was partly reversed when treated with EPT (Figure 6A–B, p < .01). This suppressive effect is associated with the inhibition of the activated PERK/eIF2α/ATF4/CHOP ER stress pathways. As shown in Figure 6C–G, the levels of PERK, EIF2α, ATF4, and CHOP proteins were significantly decreased in the I/R + EPT groups (Figure 6C–G, p < .05). These results indicated that EPT could inhibit the PERK/eIF2α/ATF4/CHOP ER stress signaling pathway in the myocardial tissue of I/R rats.

Figure 6.

Notes: I/R group compared with the control group: ^##p < .01.

The Molecular Docking Simulation of EPT with Key Proteins in the Pro-inflammation and ER Stress Signaling Pathway

Molecular docking simulation can reflect the interaction between the small molecule ligands with macromolecules. Figure 7 showed that EPT could closely bind to P2X7R, GRP78, and PERK proteins (Figure 7), and the lowest binding energies were –5.63, –4.64, and –4.74 kcal/mol (Table 1). As shown in Figure 1, the binding energies of the 10 molecular docking models calculated for each protein were all less than –1.2 kcal/mol. According to the autodocking software, all of these bindings were relatively stable, suggesting that EPT can form stable bindings with key proteins in the P2X7R/NLRP3 pathway and PERK/eIF2α/ATF4/CHOP pathway. This may be a potential mechanism by which EPT inhibits the P2X7R/NLRP3 pro-inflammation pathway and the PERK/eIF2α/ATF4/CHOP ER stress signaling pathway.

Table 1.

The Docked Energy of Docking of P2X7R, GRP78, and PERK with Eupatilin (EPT).

Ligand	Protein	Binding Energy (kcal/mol)
Eupatilin	P2X7R	–5.63
	GRP78	–4.64
	PERK	–4.74

Figure 7.

The Molecular Docking Simulation of Eupatilin with Key Proteins in the Pro-inflammation and Endoplasmic Reticulum (ER) Stress Signaling Pathway.

Discussion

Consistent with our hypothesis, the results of the present study showed that EPT had a noteworthy protective effect against myocardial I/R injury in rats. This perspective was supported by several pieces of evidence: first, H&E staining and myocardial injury marker measurements showed that the pathological changes in myocardial tissues were significantly attenuated, and myocardial injury marker levels were obviously decreased after EPT treatment. Second, the inflammatory response, ER stress, and apoptosis rate were significantly reduced in the myocardial tissues of the EPT-treated group. In addition, EPT could inhibit the P2X7R/NLRP3 pro-inflammatory signaling pathway and the PERK/eIF2α/ATF4/CHOP pro-ER stress signaling pathway in cardiomyocytes. This protective effect of EPT against myocardial I/R injury, as clarified in the present study, is a piece of well-complementary and corroborating evidence for its visceral protective function. It has been shown that EPT has a significant damage-protective effect on both liver (Lee et al., 2016) and kidney (Xu et al., 2024). In fact, it is worth noting that such aforementioned effect of EPT is not unique to traditional herbal extracts, as icariin exerts (Meng et al., 2015), celastrol (Li et al., 2017), and ginsenosides (Wu et al., 2011) have shown some potential to counteract myocardial I/R injury. However, it should be noted that EPT is mainly derived from Artemisia Linn. leaves, which have obvious advantages of wide source, easy cultivation, and low raw material price compared to ginseng and other valuable herbs. Therefore, it may be cheaper and more readily available for subsequent applications, which is more conducive to EPT’s widespread use.

In addition to differences in medicinal value, there are some differences in the mechanisms by which EPT and other natural plant products protect against myocardial I/R injury. For example, although botulin (Yu et al., 2021), luteolin (Zhang et al., 2017), and ginsenosides (Qi et al., 2022) can inhibit inflammatory responses in the myocardium by targeting NLRP3 inflammasome activity, there are some subtle differences in their specific mechanisms. Such differences may be due to the different structures of the small molecules, which result in variations in the types of target proteins they bind to in the inflammatory pathway (An et al., 2004). In addition, there are also discrepancies in the binding ability of different small molecules to the same protein (Gilson & Zhou, 2007). In this study, we simulated by molecular docking that EPT could stabilize binding to P2X7R proteins, which may be the direct cause of its inhibition of the P2X7R/NLRP3 pro-inflammatory pathway. In contrast, ginsenosides and luteolin may bind to other key proteins in the inflammatory pathway, but the relevant information has yet to be verified by subsequent experiments such as molecular docking simulations.

In addition, molecular docking simulations in this study also showed that EPT could stably bind to PERK, a key protein in the PERK/eIF2α/ATF4/CHOP pathway that mediates ER stress (Liu et al., 2013), as well as to the ER stress marker protein GRP78 (Rao et al., 2002). These may be the potential mechanism by which EPT could modulate ER stress and thus inhibit apoptosis of cardiomyocytes. Again, this theory has yet to be verified with the assistance of cryo-electron microscopy (Murata & Wolf, 2018), which could allow researchers to observe the actual molecular structure of EPT-target proteins complex. In addition, when exploring the specific mechanisms of EPT’s regulation of the above pathways, specific inhibitors of the pathway (Das et al., 2021) could be used to verify whether the pathway plays a key role in the protective effects of EPT.

In addition to the lack of practical validation of the molecular docking simulation results, the present study also did not conduct long-term follow-up measurements of myocardial function and organ damage (Suwaidi et al., 2000) in the EPT-treated group, which is an important reference for evaluating the effectiveness of a drug in the clinic, and therefore, the relevant data should be supplemented in the subsequent study. In addition, given that the respiratory system is closely related to cardiovascular function (Koepchen, 1983), it should also be observed in subsequent studies whether EPT improves lung function while alleviating myocardial I/R injury and explore whether this potential improvement effect is related to the modulation of the respiratory chain by EPT.

Conclusion

In summary, this study demonstrated that EPT could attenuate myocardial I/R injury in rats and that this protective mechanism may be related to the binding of EPT to P2X7R protein, which, in turn, inhibits the P2X7R/NLRP3 pro-inflammatory pathway, as well as the binding of EPT to PERK protein, which, in turn, inhibits the PERK/eIF2α/ATF4/CHOP pro-ER stress signaling pathway. These findings provide some valuable references for the clinical application of EPT for coronary heart disease protection and attenuation of myocardial IR injury in the future.

Footnotes

Abbreviations

ANOVA: Analysis of variance; ATF4: Activating transcription factor 4; BCA: Bicinchoninic acid; CHOP: C/EBP homologous protein; CK: Creatine kinase; DAPI: 4′,6-Diamidino-2-phenylindole; ECG: Electrocardiogram; ELISA: Enzyme-linked immunosorbent assay; EPT: Eupatilin; ER: Endoplasmic reticulum; H&E: Hematoxylin and eosin; I/R: Ischemia/Reperfusion; JAK2: Janus kinase 2; LAD: Left anterior descending coronary artery; LDH: Lactate dehydrogenase; NLRP3: NOD-, LRR- and pyrin domain-containing protein 3; P2X7R: Purinergic P2x7 receptor; PERK/eIF2α: Pancreatic endoplasmic reticulum eIF2alpha kinase; RCSB: The Research Collaboratory for Structural Bioinformatics Protein Data Bank; SOCS3: Suppressor of cytokine signaling 3; STAT3: Signal transducer and activator of transcription 3; TCMSP: The Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform; TUNEL: Terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling.

Data Availability Statement

Data will be made available upon reasonable request.

Declaration of Conflicting Interests

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Ethical Approval and Informed Consent

The animal experiments were strictly adhered to international regulations on the welfare of experimental animals and carried out with the approval of the Animal Care and Use Committee of Yanbian University Hospital.

Funding

The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The study was supported by the National Natural Science Foundation of China (82060052).

ORCID iD

Xiang Li

References

, Totrov

, & Abagyan

(2004). Comprehensive identification of “druggable” protein ligand binding sites. Genome Informatics , 15(2), 31–41. https://doi.org/10.11234/gi1990.15.2_31

Bui

A. H.

, & Waks

J. W.

(2018). Risk stratification of sudden cardiac death after acute myocardial infarction. The Journal of Innovations in Cardiac Rhythm Management , 9(2), 3035–3049. https://doi.org/10.19102/icrm.2018.090201

Choi

E.-J.

, Lee

, Chae

J.-R.

, Lee

H.-S.

, Jun

C.-D.

, & Kim

S.-H.

(2011). Eupatilin inhibits lipopolysaccharide-induced expression of inflammatory mediators in macrophages. Life Sciences , 88(25–26), 1121–1126. https://doi.org/10.1016/j.lfs.2011.04.011

Das

, Sarkar

, Rawat

V. S.

, Kalita

, Deka

, & Agnihotri

(2021). Promise of the NLRP3 inflammasome inhibitors in in vivo disease models. Molecules , 26(16), 4996. https://doi.org/10.3390/molecules26164996

Ghafouri-Fard

, Shoorei

, Poornajaf

, Hussen

B. M.

, Hajiesmaeili

, Abak

, Taheri

, & Eghbali

(2022). NLRP3: Role in ischemia/reperfusion injuries. Frontiers in Immunology , 13, Article 926895. https://doi.org/10.3389/fimmu.2022.926895

Gilson

M. K.

, & Zhou

H.-X.

(2007). Calculation of protein-ligand binding affinities. Annual Review of Biophysics and Biomolecular Structure , 36(1), 21–42. https://doi.org/10.1146/annurev.biophys.36.040306.132550

Hausenloy

D. J.

, & Yellon

D. M.

(2013). Myocardial ischemia-reperfusion injury: A neglected therapeutic target. The Journal of Clinical Investigation , 123(1), 92–100. https://doi.org/10.1172/JCI62874

Jeong

E. K.

, Jang

H. J.

, Kim

S. S.

, Oh

M. Y.

, Lee

D. H.

, Eom

D. W.

, Kang

K. S.

, Kwan

H. C.

, Ham

J. Y.

, Park

C. S.

, Jang

D. S.

, & Han

D. J.

(2015). Protective effect of eupatilin against renal ischemia-reperfusion injury in mice. Transplantation Proceedings , 47(3), 757–762. https://doi.org/10.1016/j.transproceed.2014.12.044

Koepchen

H. P.

(1983). Respiratory and cardiovascular “centres”: Functional entirety or separate structures? In Schläfke

M. E.

, See

W. R.

, & Koepchen

H.-P.

(Eds), Central neurone environment and the control systems of breathing and circulation. Proceedings in life sciences (pp. 221–237). Springer. https://doi.org/10.1007/978-3-642-68657-3_28

10.

Lee

H. M.

, Jang

H. J.

, Kim

S. S.

, Kim

H. J.

, Lee

S. Y.

, Oh

M. Y.

, Kwan

H. C.

, Jang

D. S.

, & Eom

D. W.

(2016). Protective effect of eupatilin pretreatment against hepatic ischemia-reperfusion injury in mice. Transplantation Proceedings , 48(4), 1226–1233. https://doi.org/10.1016/j.transproceed.2016.01.024

11.

, Wu

, Zou

, & Jia

(2017). Protective effect of celastrol on myocardial ischemia–reperfusion injury. Anatolian Journal of Cardiology , 18(6), 384–390. https://doi.org/10.14744/AnatolJCardiol.2017.7866

12.

Liu

Z.-W.

, Zhu

H.-T.

, Chen

K.-L.

, Dong

, Wei

, Qiu

, & Xue

J.-H.

(2013). Protein kinase RNA-like endoplasmic reticulum kinase (PERK) signaling pathway plays a major role in reactive oxygen species (ROS)-mediated endoplasmic reticulum stress-induced apoptosis in diabetic cardiomyopathy. Cardiovascular Diabetology , 12, 158. https://doi.org/10.1186/1475-2840-12-158

13.

, Wang

, Zhang

, & Liu

(2021). Etomidate attenuates the ferroptosis in myocardial ischemia/reperfusion rat model via Nrf2/HO-1 pathway. Shock , 56(3), 440–449. https://doi.org/10.1097/SHK.0000000000001751

14.

Meng

, Pei

, & Lan

(2015). Icariin exerts protective effect against myocardial ischemia/reperfusion injury in rats. Cell Biochemistry and Biophysics , 73(1), 229–235. https://doi.org/10.1007/s12013-015-0669-6

15.

Mokhtari-Zaer

, Marefati

, Atkin

S. L.

, Butler

A. E.

, & Sahebkar

(2018). The protective role of curcumin in myocardial ischemia–reperfusion injury. Journal of Cellular Physiology , 234(1), 214–222. https://doi.org/10.1002/jcp.26848

16.

Muhammed

M. T.

, & Aki-Yalcin

(2024). Molecular docking: Principles, advances, and its applications in drug discovery. Letters in Drug Design and Discovery , 21(3), 480–495. https://doi.org/10.2174/1570180819666220922103109

17.

Murata

, & Wolf

(2018). Cryo-electron microscopy for structural analysis of dynamic biological macromolecules. Biochimica et Biophysica Acta. General Subjects , 1862(2), 324–334. https://doi.org/10.1016/j.bbagen.2017.07.020

18.

Nageen

, Sarfraz

, Rasul

, Hussain

, Rukhsar

, Irshad

, & Ali

(2018). Eupatilin: A natural pharmacologically active flavone compound with its wide range applications. Journal of Asian Natural Products Research , 22(1), 1–16. https://doi.org/10.1080/10286020.2018.1492565

19.

Omata

, Matsui

, Inomata

, & Ohno

(1997). Protective effects of polysaccharide fucoidin on myocardial ischemia-reperfusion injury in rats. Journal of Cardiovascular Pharmacology , 30(6), 717–724. https://doi.org/10.1097/00005344-199712000-00003

20.

, Yan

, Wang

, Ji

, Yang

, Zhang

, Li

, Xu

, & Zhang

(2022). Ginsenoside Rh2 inhibits NLRP3 inflammasome activation and improves exosomes to alleviate hypoxia-induced myocardial injury. Frontiers in Immunology , 13, Article 883946. https://doi.org/10.3389/fimmu.2022.883946

21.

Rao

R. V.

, Peel

, Logvinova

, del Rio

, Hermel

, Yokota

, Goldsmith

P. C.

, Ellerby

L. M.

, Ellerby

H. M.

, & Bredesen

D. E.

(2002). Coupling endoplasmic reticulum stress to the cell death program: Role of the ER chaperone GRP78. FEBS Letters , 514(2–3), 122–128. https://doi.org/10.1016/S0014-5793(02)02289-5

22.

Reddy

, Khaliq

, & Henning

R. J.

(2015). Recent advances in the diagnosis and treatment of acute myocardial infarction. World Journal of Cardiology , 7(5), 243–276. https://doi.org/10.4330/wjc.v7.i5.243

23.

Shen

, Wang

, Sun

, & Ma

(2022). Role of NLRP3 inflammasome in myocardial ischemia-reperfusion injury and ventricular remodeling. Medical Science Monitor: International Medical Journal of Experimental and Clinical Research , 28, Article e934255. https://doi.org/10.12659/MSM.934255

24.

Suwaidi

J. A.

, Hamasaki

, Higano

S. T.

, Nishimura

R. A.

, Holmes

D. R.

Jr. , & Lerman

(2000). Long-term follow-up of patients with mild coronary artery disease and endothelial dysfunction. Circulation , 101(9), 948–954. https://doi.org/10.1161/01.CIR.101.9.948

25.

Syme

S. L.

, & Guralnik

J. M.

(2022). Epidemiology and health policy: Coronary heart disease. In Epidemiology and health policy (pp. 85–116). Routledge.

26.

Turer

A. T.

, & Hill

J. A.

(2010). Pathogenesis of myocardial ischemia-reperfusion injury and rationale for therapy. The American Journal of Cardiology , 106(3), 360–368. https://doi.org/10.1016/j.amjcard.2010.03.032

27.

Wang

, Gao

, Yang

, Wang

, Cao

, Sun

, Fan

, & Fu

(2020). Artemisinin suppresses myocardial ischemia–reperfusion injury via NLRP3 inflammasome mechanism. Molecular and Cellular Biochemistry , 474(1–2), 171–180. https://doi.org/10.1007/s11010-020-03842-3

28.

Wang

, Li

Y.-H.

, Liu

R.-P.

, Wang

X.-Q.

, Zhu

M.-B.

, Cui

X.-S.

, Dai

, Kim

N.-H.

, & Xu

Y.-N.

(2024). Supplementation with eupatilin during in vitro maturation improves porcine oocyte developmental competence by regulating oxidative stress and endoplasmic reticulum stress. Animals: An Open Access Journal from MDPI , 14(3), 449. https://doi.org/10.3390/ani14030449

29.

, Xia

Z.-Y.

, Dou

, Zhang

, Xu

J.-J.

, Zhao

, Lei

, & Liu

H.-M.

(2011). Protective effect of ginsenoside Rb1 against myocardial ischemia/reperfusion injury in streptozotocin-induced diabetic rats. Molecular Biology Reports , 38(7), 4327–4335. https://doi.org/10.1007/s11033-010-0558-4

30.

, Ye

, Yang

, & Ding

(2016). Endoplasmic reticulum stress-induced apoptosis: A possible role in myocardial ischemia–reperfusion injury. International Journal of Cardiology , 208, 65–66. https://doi.org/10.1016/j.ijcard.2016.01.119

31.

, Zhang

, Zhai

, Hu

, Luo

, Zhou

, Zhang

, Zhou

, & Liu

(2020). Cathelicidin aggravates myocardial ischemia/reperfusion injury via activating TLR4 signaling and P2X7R/NLRP3 inflammasome. Journal of Molecular and Cellular Cardiology , 139, 75–86. https://doi.org/10.1016/j.yjmcc.2019.12.011

32.

, Wu

, Yang

, Liu

, Tong

, Wan

, Han

, Zhou

, & Hu

(2024). Eupatilin inhibits xanthine oxidase in vitro and attenuates hyperuricemia and renal injury in vivo. Food and Chemical Toxicology , 183, Article 114307. https://doi.org/10.1016/j.fct.2023.114307

33.

Yang

, Zhou

, Jia

, Li

, Zhao

, & Wang

(2023). Network pharmacology based research into the effect and potential mechanism of Portulaca oleracea L. polysaccharide against ulcerative colitis. Computers in Biology and Medicine , 161, Article 106999. https://doi.org/10.1016/j.compbiomed.2023.106999

34.

, Cai

, Liu

, & Zhu

(2021). Betulin alleviates myocardial ischemia–reperfusion injury in rats via regulating the Siti1/NLRP3/NF-κB signaling pathway. Inflammation , 44(3), 1096–1107. https://doi.org/10.1007/s10753-020-01405-8

35.

Zhang

, Du

, Yang

, Wang

, Dou

, Liu

, & Duan

(2017). The protective effect of luteolin on myocardial ischemia/reperfusion (I/R) injury through TLR4/NF-κB/NLRP3 inflammasome pathway. Biomedicine and Pharmacotherapy , 91, 1042–1052. https://doi.org/10.1016/j.biopha.2017.05.033

36.

Zhang

, Huang

, Shi

, Yang

, Hua

, Ma

, Zhu

, Liu

, Xuan

, Shen

, Liu

, Lai

, & Yu

(2020). Metformin protects against myocardial ischemia-reperfusion injury and cell pyroptosis via AMPK/NLRP3 inflammasome pathway. Aging , 12(23), 24270–24287. https://doi.org/10.18632/aging.202143

37.

Zhang

Y.-M.

, Zhang

Z.-Y.

, & Wang

R.-X.

(2020). Protective mechanisms of quercetin against myocardial ischemia reperfusion injury. Frontiers in Physiology , 11, 956. https://doi.org/10.3389/fphys.2020.00956

38.

Zhu

, & Zhou

(2021). Novel insight into the role of endoplasmic reticulum stress in the pathogenesis of myocardial ischemia-reperfusion injury. Oxidative Medicine and Cellular Longevity , 2021(1), Article 5529810. https://doi.org/10.1155/2021/5529810

Integrate Molecular Docking and Animal Model Validation into the Research of the Effect and Potential Mechanism of Eupatilin Against Myocardial Ischemia/Reperfusion Injury

Abstract

Background

Objectives

Materials and Methods

Results

Conclusion

Keywords

Introduction

Materials and Methods

Ethics Statement

Materials and Reagents

I/R Rat Model Preparation and EPT Treatment

Measurement of Serum Biochemical Parameters

Histopathological Analysis of Myocardial Tissue

Measurement of the Cell Apoptosis in Myocardial Tissue

Western Blot Analysis

Molecular Docking

Statistical Analysis

Results

EPT Attenuated Myocardium Damage Caused by I/R in Rats

EPT Attenuated Inflammation Response Caused by I/R in Rats

The Inhibition of P2X7R/NLRP3 and JAK2/STAT3/SOCS3 Pro-inflammation Pathway by EPT in the Myocardial Tissue of I/R Rats

EPT Reduced Cell Apoptosis in the Myocardial Tissue of I/R Rats

The Inhibition of PERK/eIF2α/ATF4/CHOP ER Stress Signaling Pathway by EPT in the Myocardial Tissue of I/R Rats

The Molecular Docking Simulation of EPT with Key Proteins in the Pro-inflammation and ER Stress Signaling Pathway

The Docked Energy of Docking of P2X7R, GRP78, and PERK with Eupatilin (EPT).

The Molecular Docking Simulation of Eupatilin with Key Proteins in the Pro-inflammation and Endoplasmic Reticulum (ER) Stress Signaling Pathway.

Discussion

Conclusion

Footnotes

Abbreviations

Data Availability Statement

Declaration of Conflicting Interests

Ethical Approval and Informed Consent

Funding

ORCID iD

References