Abstract
Background
Mineralocorticoid receptor (MR) antagonists have been widely used to treat heart failure
(HF). Studies have shown that MR in T cells plays important roles in hypertension
and myocardial hypertrophy. However, the function of T cell MR in myocardial infarction
(MI) has not been elucidated.
Methods
In this study, we used T cell MR knockout (TMRKO) mouse to investigate the impacts
of T cell MR deficiency on MI and to explore the underlying mechanisms. Echocardiography
and tissue staining were used to assess cardiac function, fibrosis, and myocardial
apoptosis after MI. Flow cytometry and qRT-PCR were used to detect immune cell filtration
and inflammation.
Results
T cell MR deficiency significantly improved cardiac function, promoted myocardial
repair, and inhibited myocardial apoptosis, fibrosis and inflammation after MI. Luminex
assays revealed that TMRKO mice had significantly lower levels of interferon-gamma
and interleukin-6 (IL-6) in serum and infarcted myocardium than littermate control
mice. In cultured splenic T cells, MR deficiency suppressed IL-6 expression whereas
MR overexpression enhanced IL-6 expression. ChIP assay demonstrated that MR bound
to the MR response element on the promoter of IL-6 gene. Finally, T cell MR deficiency significantly suppressed accumulation of macrophages
in infarcted myocardium and differentiation of pro-inflammatory macrophages, thereby
alleviating the consequences of MI.
Conclusions
T cell MR deficiency improved pathological ventricular remodeling after MI, likely
through inhibition of accumulation and differentiation of pro-inflammatory macrophages.
At the molecular level, MR may work through interferon-gamma and IL-6 in T cells to
exert functions in MI.
Graphical abstract

Graphical Abstract
Key words
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Article info
Publication history
Accepted:
January 10,
2023
Received in revised form:
December 27,
2022
Received:
September 12,
2022
Publication stage
In Press Journal Pre-ProofIdentification
Copyright
© 2023 Published by Elsevier Inc. on behalf of the Canadian Cardiovascular Society.