Affiliation:
1. Second Affiliated Hospital of Anhui Medical University
2. Anhui University of Traditional Chinese Medicine
3. First Affiliated Hospital of University of Science and Technology of China
Abstract
Abstract
The present study was designed to investigate whether 17β-estrogen (E2) reduces myocardial I/R injury by inhibiting NLRP3 inflammasome mediated pyroptosis. In vivo, four-weeks-old female C57BL/6 mice underwent ovariectomy (Ovx) before E2 replacement therapy. After the establishment of myocardial I/R injury, plasma E2, LDH and CK-MB were detected, and the myocardial infarction (MI) size, TUNEL immunofluorescence, and the expressions of TXNIP, NLRP3, caspase-1, apoptosis-associated speck-like protein containing a CARD (ASC), Gasdermin D protein (GSDMD), IL-1β were compared among each group. In vitro, primary mice cardiomyocytes were isolated to create hypoxia/reoxygenation (H/R) model. The cells viability, the release of LDH, TXNIP, IL-18, IL-1β, caspase-1 viability, level of cardiomyocytes death and the expression of TXNIP, NLRP3, caspase1, ASC, IL-1β, GSDMD were compared among each groups. In vivo, E2 replacement therapy significantly reduced infarct size and pyroptosis compared with mice in OVX + I/R group. In addition, E2 replacement could markedly suppressed expressions of pyroptosis related proteins, including TXNIP, NLRP3, cleaved Caspase-1, ASC, IL-1β as well as the pyroptosis executor GSDMD. In vitro, the effects of E2 on cardiomyocytes injury and pyroptosis related proteins were dramatically reversed when co-administrated with estrogen receptor antagonist ICI 182780. In addition, NLRP3 inhibitor Bay11-7082 could preserve cell viability, reduce pyroptosis as well as expressions of pyroptosis related proteins. Furthermore, pretreatment with Caspase-1 inhibitor AC-YVAD-CMK could significantly limit cell injury and reduce expressions of pyroptosis related proteins. Our study demonstrated that estrogen alleviate myocardial I/R injury by inhibiting the level of pyroptosis via ER/TXNIP/NLRP3/Caspase-1.
Publisher
Research Square Platform LLC