Cardiovascular diseases remain the leading cause of global mortality. Cellular senescence has recently been implicated in the pathogenesis of various cardiovascular diseases. Our group has previously shown that the matricellular protein CCN5 is a potent anti-fibrotic molecule capable of inhibiting and reversing cardiac fibrosis. In this study, we investigated whether CCN5 can modulate cellular senescence in the heart utilizing three readouts: western blotting for p53 and p21, staining for senescence-associated β-galactosidase, and microscopic analysis of γH2AX-foci. CCN5 effectively inhibited doxorubicin-induced cellular senescence in both H9c2 cardiac myoblasts and fibroblasts. In addition, CCN5 suppressed cellular senescence in H9c2 cardiac myoblasts induced by the senescence-associated secretory phenotype factors secreted from cardiac fibroblast, and vice versa. CCN5 also restored the apoptotic response of senescent cells. Finally, CCN5 attenuated myocardial infarction-induced cellular senescence in mice. Collectively, our findings provide novel insights into the potential role of CCN5 in the development of anti-senescence therapies.
Jo et al. (Fri,) studied this question.