ZHANG Chun;ZHANG Shumeng;MAO Yan;CHEN Xing;KUANG Huifang;YANG Yi;CHEN Lingli;LI Jie;Hunan University of Chinese Medicine;Objective To investigate the mechanism of Yangxin Tongmai Formula (养心通脉方, YTF) in treating coronary heart disease with blood stasis syndrome based on DNA methylation. Methods Seventy-two SD rats were randomly divided into a control group(n=12) and a modeling group(n=60). The modeling group was subjected to a high-fat diet, intragastric administration of vitamin D3, and subcutaneous injection of isoprenaline to establish the rat model of coronary heart disease with blood stasis syndrome. Forty-one successfully modeled rats were then randomly allocated into model group, YTF low-, medium-, and high-dose groups, and the atorvastatin calcium group, with 8 rats in each group and 1 rat reserved. The YTF low-, medium-, and high-dose groups received YTF at 6, 12, and 18 g/(kg·d) by gavage, respectively. The atorvastatin calcium group received atorvastatin calcium tablets at 1. 8 mg/(kg·d) by gavage. The control group and the model group received 0. 9% sodium chloride injection at 4 ml/(kg·d) by gavage. All administrations were performed once daily for 3 weeks. Twenty-four hours after the last administration, serum lipid levels including total cholesterol(TC), triglycerides(TG), low-density lipoprotein cholesterol(LDL-C), and high-density lipoprotein cholesterol(HDL-C), myocardial enzymes including cardiac troponin T(cTnT), creatine kinase MB(CK-MB), and lactate dehydrogenase(LDH), and inflammatory factors including interleukin-1β(IL-1β) and interleukin-10(IL-10) were detected by ELISA. Pathological changes in myocardial tissue were observed via HE staining. Whole blood DNA methylation sequencing was used to analyze differential methylation gene expression among the control group, model group, and YTF high-dose group. Western Blotting was used to verify the protein levels of the key genes and downstream signaling pathways. Results Compared to the control group, the model group showed increased levels of TC, TG, LDL-C, cTnT, CK-MB, LDH, and IL-1β, along with decreased levels of HDL-C and IL-10(P<0. 05 or P<0. 01). Compared to the model group, all treatment groups exhibited decreased levels of TC, LDL-C, CK-MB, and LDH, along with increased IL-10 levels. Among these, the high-dose YTF group demonstrated superior efficacy in reducing cTnT levels compared to the other TCM groups(P<0. 05 or P<0. 01). HE staining indicated that the YTF high-dose group ameliorated myocardial cell swelling, disordered arrangement, pyknosis, and disappearance of nuclei, thereby reducing myocardial cell damage. Whole blood DNA methylation sequencing identified 240 differentially methylated genes shared by the control group, model group, and YTF high-dose group, including 109 hypermethylated and 131 hypomethylated genes; eif2 ak3 was identified as a key differentially methylated gene. Compared to the control group, the model group exhibited increased protein levels of eukaryotic translation initiation factor 2 alpha kinase 3(eIf2 ak3), phosphorylated protein kinase RNA-like endoplasmic reticulum kinase(p-PERK), activating transcription factor 4(ATF4), C/EBP homologous protein(CHOP), and Bax, along with a decreased level of B-cell lymphoma-2(Bcl-2) protein(P<0. 05 or P<0. 01). Compared to the model group, the YTF high-dose group showed decreased protein levels of eIf2 ak3, p-PERK, ATF4, CHOP, and Bax, and an increased level of Bcl-2 protein(P<0. 05 or P<0. 01). Conclusion YTF may regulate key differentially methylated genes such as eIf2 ak3 and the PERK/ATF4/CHOP signaling pathway, thereby inhibiting endoplasmic reticulum stress, reducing myocardial cell apoptosis, and exerting therapeutic effects in coronary heart disease blood stasis syndrome.
2026 07 v.67 [Abstract][OnlineView][Download 1347K]