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• W2949077795 abstract "Abstract Aims Pathological cardiac hypertrophy is the result of increased cardiomyocyte size, leading to thickening of the left ventricular walls and a decrease in the left ventricular chamber. With early treatment of the underlying cause, cardiac hypertrophy can be reversed in some individuals, while it persists in others. Here, we investigate mechanisms leading to regression of pathological cardiac hypertrophy in two mouse models, in addition to defining the sex differences associated with hypertrophy and regression. Methods and Results Two pathological hypertrophic stimuli were used in male and female mice (Isoproterenol or Angiotensin II). The stimulus was removed after 7 days of treatment, then the left ventricle was studied at intervals up to 7 days following the removal of the stimulus. Following Isoproterenol removal, male hearts returned to baseline sizes in 4 days while it took 7 days for female hearts to regress. After Angiotensin II removal, the left ventricular masses of males and females did not regress. ERK1/2 was activated in response to both Isoproterenol and Angiotensin II in males, then decreased back to baseline one day after stimulus removal. Expression of ECM genes was greater in response to Angiotensin II and remained elevated longer after Angiotensin II removal, compared to Isoproterenol. Further, collagen content may be playing a role in the irreversible state of Angiotensin II induced hypertrophy as hydroxyproline content was increased following the removal of Angiotensin II in both males and females. Conclusions Regression of pathological cardiac hypertrophy is possible in some people and in some mouse models; however, the ability for the heart to regress is dependent on the stimulus and biological sex. Further, molecular changes including cellular signaling, protein degradation pathways and the formation of a fibrotic network may contribute to the ability to reverse pathological cardiac hypertrophy and are stimulus- and sex-dependent. Translational Perspective Pathological cardiac hypertrophy is a major risk factor for mortality. If cardiac hypertrophy persists for an extended time, there can be many maladaptive changes to the myocardium. With early treatment of the underlying cause, cardiac hypertrophy can be reversed in some individuals, but not in others. While cardiac hypertrophy has been studied extensively, very little is understood about regression of cardiac hypertrophy. It is important that we have a better understanding of mechanisms leading to regression and why this process might not be reversible in some individuals." @default.
• W2949077795 created "2019-06-27" @default.
• W2949077795 creator A5023110410 @default.
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• W2949077795 date "2019-06-24" @default.
• W2949077795 modified "2023-09-26" @default.
• W2949077795 title "Regression from pathological hypertrophy is sexually dimorphic and stimulus-specific" @default.
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• W2949077795 doi "https://doi.org/10.1101/678540" @default.
• W2949077795 hasPublicationYear "2019" @default.
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