Why the study?
It was unclear whether cardiomyocyte myofilament function changes through the time course of diabetes in Zucker Diabetic Fatty rats and what mechanisms underlie alterations in calcium sensitivity.
In a diabetic rat model, increased myofilament calcium sensitivity is associated with reduced cardiac troponin I phosphorylation, suggesting a mechanism for diabetic cardiac dysfunction.
Remains hypothesis-generating in diabetic rat models; leaves open translation to human cardiomyopathy or therapeutic targets.
NEW FINDINGS: What is the central question of this study? In Zucker Diabetic Fatty rats, does cardiomyocyte myofilament function change through the time course of diabetes and what are the mechanisms behind alterations in calcium sensitivity? What is the main finding and its importance? Zucker Diabetic Fatty rats had increased myofilament calcium sensitivity and reduced phosphorylation at cardiac troponin I without differential O-GlcNAcylation. ABSTRACT: is greater in DM rats and corresponds with an overall reduction in cTnI phosphorylation. These findings indicate that myofilament calcium sensitivity is increased and cTnI phosphorylation is reduced in ZDF DM rats and suggests an important role for cTnI phosphorylation in the DM heart.
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Greenman et al. (2021) studied this question.
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