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—Mice with overexpressed cardiac Gsα develop cardiomyopathy, characterized by myocyte hypertrophy and extensive myocardial fibrosis. The cardiomyopathy likely involves chronically enhanced β-adrenergic signaling, because it can be blocked with long-term propranolol treatment. It remains unknown whether the genotype of the myocyte is solely responsible for the progressive pathological changes. A chimeric population in the heart should answer this question. Accordingly, we developed a chimeric animal, which combined cells from a transgenic overexpressed Gsα parent and a Rosa mouse containing the LacZ reporter gene, facilitating identification of the non–Gsα cells, which express a blue color with exposure to β-galactosidase. We studied these animals at 14 to 17 months of age (when cardiomyopathy should have been present), with the proportion of Gsα cells in the myocardium ranging from 5% to 88%. β-Galactosidase staining of the hearts demonstrated Gsα and Rosa cells, exhibiting a mosaic pattern. The fibrosis and hypertrophy, characteristic of the cardiomyopathy, were not distributed randomly. There was a direct correlation (r =0.85) between the extent of myocyte hypertrophy (determined by computer imaging) and the quantity of Gsα cells. The fibrosis, determined by picric acid Sirius red, was also more prominent in areas with the greatest Gsα cell density, with a correlation ofr =0.88. Thus, the overexpressed Gsα can exert its action over the life of the animal, resulting in a local picture of cardiomyopathic damage in discrete regions of the heart, where clusters of the overexpressed Gsα cells reside, sparing the clusters of normal cells derived from the normal Rosa parent.

Determinants of the Cardiomyopathic Phenotype in Chimeric Mice Overexpressing Cardiac Gsα