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Molecular and Cellular Biology, May 2008, p. 3424-3436, Vol. 28, No. 10
0270-7306/08/$08.00+0     doi:10.1128/MCB.02186-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

MURC, a Muscle-Restricted Coiled-Coil Protein That Modulates the Rho/ROCK Pathway, Induces Cardiac Dysfunction and Conduction Disturbance{triangledown}

Takehiro Ogata,1 Tomomi Ueyama,1* Koji Isodono,1,2 Masashi Tagawa,1,2 Naofumi Takehara,2 Tsuneaki Kawashima,3 Koichiro Harada,1 Tomosaburo Takahashi,1,2 Tetsuo Shioi,3 Hiroaki Matsubara,1,2 and Hidemasa Oh1

Department of Experimental Therapeutics, Translational Research Center, Kyoto University Hospital, Kyoto 606-8507, Japan,1 Department of Cardiovascular Medicine, Kyoto Prefectural University School of Medicine, Kyoto 602-8566, Japan,2 Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Kyoto 606-8507, Japan3

Received 11 December 2007/ Returned for modification 10 January 2008/ Accepted 4 March 2008

We identified a novel muscle-restricted putative coiled-coil protein, MURC, which is evolutionarily conserved from frog to human. MURC was localized to the cytoplasm with accumulation in the Z-line of the sarcomere in the murine adult heart. MURC mRNA expression in the heart increased during the developmental process from the embryonic stage to adulthood. In response to pressure overload, MURC mRNA expression increased in the hypertrophied heart. Using the yeast two-hybrid system, we identified the serum deprivation response (SDPR) protein, a phosphatidylserine-binding protein, as a MURC-binding protein. MURC induced activation of the RhoA/ROCK pathway, which modulated serum response factor-mediated atrial natriuretic peptide (ANP) expression and myofibrillar organization. SDPR augmented MURC-induced transactivation of the ANP promoter in cardiomyocytes, and RNA interference of SDPR attenuated the action of MURC on the ANP promoter. Transgenic mice expressing cardiac-specific MURC (Tg-MURC) exhibited cardiac contractile dysfunction and atrioventricular (AV) conduction disturbances with atrial chamber enlargement, reduced thickness of the ventricular wall, and interstitial fibrosis. Spontaneous episodes of atrial fibrillation and AV block were observed in Tg-MURC mice. These findings indicate that MURC modulates RhoA signaling and that MURC plays an important role in the development of cardiac dysfunction and conduction disturbance with increased vulnerability to atrial arrhythmias.

* Corresponding author. Mailing address: Department of Experimental Therapeutics, Translational Research Center, Kyoto University Hospital, Kyoto 606-8507, Japan. Phone: 81-75-751-4763. Fax: 81-75-751-4741. E-mail: toueyama-circ{at}umin.ac.jp

{triangledown} Published ahead of print on 10 March 2008.

Molecular and Cellular Biology, May 2008, p. 3424-3436, Vol. 28, No. 10
0270-7306/08/$08.00+0     doi:10.1128/MCB.02186-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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