Striatin plays a major role in angiotensin II-induced cardiomyocyte and cardiac hypertrophy in mice in vivo.

Autor:	Cull JJ; School of Biological Sciences, University of Reading, Reading, U.K., Cooper STE; Molecular and Clinical Sciences Institute, St. George's University of London, London, U.K., Alharbi HO; School of Biological Sciences, University of Reading, Reading, U.K., Chothani SP; Program in Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Medical School, Singapore., Rackham OJL; Program in Cardiovascular and Metabolic Disorders, Duke-National University of Singapore Medical School, Singapore.; School of Biological Sciences, University of Southampton, Southampton, U.K., Meijles DN; Molecular and Clinical Sciences Institute, St. George's University of London, London, U.K., Dash PR; School of Biological Sciences, University of Reading, Reading, U.K., Kerkelä R; Research Unit of Biomedicine and Internal Medicine, Medical Research Centre Oulu (Oulu University Hospital) and Biocenter Oulu, University of Oulu, Oulu, Finland., Ruparelia N; School of Biological Sciences, University of Reading, Reading, U.K.; Department of Cardiology, Royal Berkshire Hospital, Reading, U.K., Sugden PH; School of Biological Sciences, University of Reading, Reading, U.K., Clerk A; School of Biological Sciences, University of Reading, Reading, U.K.
Jazyk:	angličtina
Zdroj:	Clinical science (London, England : 1979) [Clin Sci (Lond)] 2024 May 22; Vol. 138 (10), pp. 573-597.
DOI:	10.1042/CS20240496
Abstrakt:	The three striatins (STRN, STRN3, STRN4) form the core of STRiatin-Interacting Phosphatase and Kinase (STRIPAK) complexes. These place protein phosphatase 2A (PP2A) in proximity to protein kinases thereby restraining kinase activity and regulating key cellular processes. Our aim was to establish if striatins play a significant role in cardiac remodelling associated with cardiac hypertrophy and heart failure. All striatins were expressed in control human hearts, with up-regulation of STRN and STRN3 in failing hearts. We used mice with global heterozygote gene deletion to assess the roles of STRN and STRN3 in cardiac remodelling induced by angiotensin II (AngII; 7 days). Using echocardiography, we detected no differences in baseline cardiac function or dimensions in STRN+/- or STRN3+/- male mice (8 weeks) compared with wild-type littermates. Heterozygous gene deletion did not affect cardiac function in mice treated with AngII, but the increase in left ventricle mass induced by AngII was inhibited in STRN+/- (but not STRN3+/-) mice. Histological staining indicated that cardiomyocyte hypertrophy was inhibited. To assess the role of STRN in cardiomyocytes, we converted the STRN knockout line for inducible cardiomyocyte-specific gene deletion. There was no effect of cardiomyocyte STRN knockout on cardiac function or dimensions, but the increase in left ventricle mass induced by AngII was inhibited. This resulted from inhibition of cardiomyocyte hypertrophy and cardiac fibrosis. The data indicate that cardiomyocyte striatin is required for early remodelling of the heart by AngII and identify the striatin-based STRIPAK system as a signalling paradigm in the development of pathological cardiac hypertrophy. (© 2024 The Author(s).)
Databáze:	MEDLINE
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