Long Noncoding RNA-DACH1 (Dachshund Homolog 1) Regulates Cardiac Function by Inhibiting SERCA2a (Sarcoplasmic Reticulum Calcium ATPase 2a).

Heart failure (HF) is a major cause of morbidity and mortality in patients with various cardiovascular diseases. Restoration of cardiac function is critical in improving the clinical outcomes of patients with HF. Long noncoding RNAs are widely involved in the development of multiple cardiac diseases, whereas their role in regulating cardiac function remains unclear. In this study, we found that the expression of long noncoding RNA-DACH1 (dachshund homolog 1) was upregulated in the failing hearts of mice and human. We tested the hypothesis that the intronic long noncoding RNA of DACH1 (LncDACH1) can participate in the regulation of cardiac function and HF. Transgenic overexpression of LncDACH1 in the cardiac myocytes of mice led to impaired cardiac function, reduced calcium transient and cell shortening, and decreased SERCA2a (sarcoplasmic reticulum calcium ATPase 2a) protein expression. In contrast, conditional knockout of LncDACH1 in cardiac myocytes resulted in increased calcium transient, cell shortening, SERCA2a protein expression, and improved cardiac function of transverse aortic constriction induced HF mice. The same qualitative data were obtained by overexpression or knockdown of LncDACH1 with adenovirus carrying LncDACH1 or its siRNA. Moreover, therapeutic administration of adenovirus carrying LncDACH1 siRNA to transverse aortic constriction mice abolished the development of HF. Mechanistically, LncDACH1 directly binds to SERCA2a. Overexpression of LncDACH1 augments the ubiquitination of SERCA2a. LncDACH1 upregulation impairs cardiac function by promoting ubiquitination-related degradation of SERCA2a.

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