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To investigate the protective mechanism of Qishen Yiqi Dropping Pills (Qishen) and its key active ingredients in combination with exosomes from bone marrow mesenchymal stem cells (BMSCs) against myocardial ischemia/reperfusion (I/R) injury.
Infarct area was assessed by Evan's Blue/TTC double staining, myocardial apoptosis was analyzed by TUNEL staining, ATP content and NAD+/NADH ratio were detected biochemically, macrophage phenotype of myocardial tissues was detected by flow cytometry, activation of the mTOR/PI3K/Akt pathway was detected by Western blotting, and miR-155-5p expression was detected by qRT-PCR. 155-5p expression. Exo were given to identify the M1/M2 phenotypic transition by immunofluorescence, and the molecular mechanism was verified as in the in vivo experiments.
Compared with the model group, the Qishen, ginsenoside, and Exo group significantly reduced the infarcted area of the heart and promoted M2 and M2 phenotypic conversion, promoted M2-type macrophage infiltration, up-regulated the p-Akt/Akt ratio, and inhibited the expression of miR-155-5p, but the combination therapy group did not show a synergistic effect, but the above protective effects were significantly weakened by the removal of macrophages. Ginsenoside and Exo synergistically promoted M2 polarization, activated the mTOR/PI3K/Akt pathway and upregulated miR-155-5p expression.
Qishen, particularly its active component ginsenoside, synergizes with BMSC-Exo to alleviate myocardial I/R injury by modulating macrophage polarization via the miR-155-5p/mTOR/PI3K/Akt signaling axis.
Qishen synergistically regulates the miR-155-5p/mTOR/PI3K/Akt signaling axis through ginsenoside components in BMSCs exosomes, promoting macrophage polarization toward M2-type, improving myocardial energy metabolism and attenuating I/R injury, and this protective effect is macrophage-dependent.
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