Activation of TLRs mediated the NF-κB signaling pathway plays an important pathophysiological role in cardiac hypertrophy. Triad3A, a ubiquitin E3 ligase, has been reported to negatively regulate NF-κB activation pathway via promoting ubiquitination and degradation of TLR4 and TLR9 in innate immune cells. The role of Triad3A in cardiac hypertrophic development remains unknown. The present study investigated whether there is a link between Triad3A and TLR4 and TLR9 in pressure overload induced cardiac hypertrophy. We observed that Triad3A levels were markedly reduced following transverse aortic constriction (TAC) induced cardiac hypertrophy. Similarly, stimulation of neonatal rat cardiac myocytes (NRCMs) with angiotensin-II (Ang II) significantly decreased Triad3A expression. To determine the role of Triad3A in TAC-induced cardiac hypertrophy, we transduced the myocardium with adenovirus expressing Triad3A followed by induction of TAC. We observed that increased expression of Triad3A significantly attenuated cardiac hypertrophy and improved cardiac function. To investigate the mechanisms by which Triad3A attenuated cardiac hypertrophy, we examined the Triad3A E3 ubiquitination on TLR4 and TLR9. We found that Triad3A promoted TLR4 and TLR9 degradation through ubiquitination. Triad3A mediated TLR4 and TLR9 degradation resulted in suppression of NF-κB activation. Our data suggest that Triad3A plays a protective role in the development of cardiac hypertrophy, at least through catalyzing ubiquitination-mediated degradation of TLR4 and TLR9, thus negatively regulating NF-κB activation.
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This work was supported by the National Natural Science Foundation of China (Nos. 81470418, 81770230).
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None of the authors declare any conflict of interest regarding this study.
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Lu, X., He, Y., Tang, C. et al. Triad3A attenuates pathological cardiac hypertrophy involving the augmentation of ubiquitination-mediated degradation of TLR4 and TLR9. Basic Res Cardiol 115, 19 (2020). https://doi.org/10.1007/s00395-020-0779-1
- Cardiac hypertrophy