Objective To explore the intervention effect and molecular mechanism of Xinkang Granules on inflammatory factors in rats with chronic heart failure based on cGAS/STING signaling pathway.Methods SD rats were randomly divided into normal group and modeling group.The chronic heart failure model was established by intraperitoneal injection of Doxorubicin Hydrochloride.After successfully modeling,the rats were further divided into model group,Valsartan group and Xinkang Granules group.The model group was treated with distilled water every day,the Valsartan group was treated with Valsartan solution every day,and the Xinkang Granules group was treated with Xinkang Granules every day,all given for 4 consecutive weeks.Echocardiography was used to detect cardiac function,the pathological changes of myocardium were detected by hematoxylin-eosin staining(HE),the ultrastructural changes of myocardium in each group were observed by transmission electron microscope,and the contents of interleukin-1β(IL-1β)and interleukin-6(IL-6)in serum were detected by enzyme-linked immunosorbent assay(ELISA).The mRNA expression levels of mitochondrial transcription factor A(TFAM),cyclic guanosine monophosphate-adenylate synthase(cGAS),interferon-stimulated gene(STING)and IL-6 in myocardial tissue of rats in each group were detected by real-time fluorescence quantitative method(qPCR).The protein expressions of cGAS and STING in rat myocardial tissue were detected by immunohistochemical method.Results Compared with the blank group,the rats in the model group had significant inflammatory cell infiltration and inflammatory edema in myocardial tissue,their cardiac function was significantly reduced(P＜0.05,P＜0.01),and serum inflammatory factors were significantly increased(P＜0.01).The mRNA expression of TFAM in myocardial tissue was significantly reduced(P＜0.01),the mRNA expressions of IL-6,cGAS,and STING were significantly increased(P＜0.01),and the protein expressions of cGAS and STING in the myocardial tissue were significantly increased(P＜0.01).Compared with the model group,the cardiac function of the rats in the Xinkang Granules group was significantly improved(P＜0.05,P＜0.01),the inflammatory infiltration of myocardial cells was reduced,the expression of serum inflammatory factors was significantly reduced(P＜0.01),the mRNA expression of TFAM in myocardial tissue was significantly increased(P＜0.05),and the mRNA expressions of IL-6,cGAS,and STING were significantly decreased(P＜0.01),the protein expressions of cGAS and STING in myocardial tissue were significantly decreased(P＜0.01).Conclusion Xinkang Granules can reduce the expression of inflammatory factors and improve cardiac function in rats with chronic heart failure.Its mechanism may be related to inhibiting the cGAS/STING signaling pathway.