| First Author | Law ML | Year | 2018 |
| Journal | Am J Physiol Heart Circ Physiol | Volume | 315 |
| Issue | 6 | Pages | H1544-H1552 |
| PubMed ID | 30118340 | Mgi Jnum | J:271885 |
| Mgi Id | MGI:6280087 | Doi | 10.1152/ajpheart.00341.2018 |
| Citation | Law ML, et al. (2018) Exacerbation of dystrophic cardiomyopathy by phospholamban deficiency mediated chronically increased cardiac Ca(2+) cycling in vivo. Am J Physiol Heart Circ Physiol 315(6):H1544-H1552 |
| abstractText | Cardiomyopathy is a significant contributor to morbidity and mortality in Duchenne muscular dystrophy (DMD). Membrane instability, leading to intracellular Ca(2+) mishandling and overload, causes myocyte death and subsequent fibrosis in DMD cardiomyopathy. On a cellular level, cardiac myocytes from mdx mice have dysregulated Ca(2+) handling, including increased resting Ca(2+) and slow Ca(2+) decay, especially evident under stress conditions. Sarco(endo)plasmic reticulum Ca(2+) ATPase and its regulatory protein phospholamban (PLN) are potential therapeutic targets for DMD cardiomyopathy owing to their key role in regulating intracellular Ca(2+) cycling. We tested the hypothesis that enhanced cardiac Ca(2+) cycling would remediate cardiomyopathy caused by dystrophin deficiency. We used a genetic complementation model approach by crossing dystrophin-deficient mdx mice with PLN knockout (PLNKO) mice [termed double-knockout (DKO) mice]. As expected, adult cardiac myocytes isolated from DKO mice exhibited increased contractility and faster relaxation associated with increased Ca(2+) transient peak height and faster Ca(2+) decay rate compared with control mice. However, compared with wild-type, mdx, and PLNKO mice, DKO mice unexpectedly had reduced in vivo systolic and diastolic function as measured by echocardiography. Furthermore, Evans blue dye uptake was increased in DKO hearts compared with control, mdx, and PLNKO hearts, demonstrating increased membrane damage, which subsequently led to increased fibrosis in the DKO myocardium in vivo. In conclusion, despite enhanced intracellular Ca(2+) handling at the myocyte level, DMD cardiomyopathy was exacerbated owing to unregulated chronic increases in Ca(2+) cycling in DKO mice in vivo. These findings have potentially important implications for ongoing therapeutic strategies for the dystrophic heart. NEW & NOTEWORTHY This study examined the effects of phospholamban ablation on the pathophysiology of cardiomyopathy in dystrophin-deficient mice. In this setting, contractility and Ca(2+) cycling were enhanced in isolated myocytes; however, in vivo heart function was diminished. Additionally, sarcolemmal integrity was compromised and fibrosis was increased. This is the first study, to our knowledge, examining unregulated Ca(2+) cycling in the dystrophin-deficient heart. Results from this study have implications for potential therapies targeting Ca(2+) handling in dystrophic cardiomyopathy. Listen to this article's corresponding podcast at https://ajpheart.podbean.com/e/unregulated-ca2-cycling-exacerbates-dmd-cardiomyop athy/ . |
