Abstract
Cardiac hypertrophy and ensuing heart failure are among the most common causes of mortality worldwide, yet the triggering mechanisms for progression of hypertrophy to failure are not fully understood. Tissue homeostasis depends on proper relationships between cell proliferation, differentiation, and death and any imbalance between them results in compromised cardiac function. Recently, we developed a transgenic (Tg) mouse model that overexpress myotrophin (a 12-kDa protein that stimulates myocyte growth) in heart resulting in hypertrophy that progresses to heart failure. This provided us an appropriate model to study the disease process at any point from initiation of hypertrophy end-stage heart failure. We studied detailed apoptotic signaling and regenerative pathways and found that the Tg mouse heart undergoes myocyte loss and regeneration, but only at a late stage (during transition to heart failure). Several apoptotic genes were up-regulated in 9-month-old Tg hearts compared with age-matched wild type or 4-week-old Tg hearts. Cardiac cell death during heart failure involved activation of Fas, tumor necrosis factor-alpha, and caspases 9, 8, and 3 and poly(ADP-ribose) polymerase cleavage. Tg mice with hypertrophy associated w...Continue Reading
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