Key result
Titin cleavage by TEV protease progressively reduced passive and active muscle forces, including a 46% reduction in active force in homozygous fibers, and caused severe A-band and Z-disk disruption during contraction.
Why the study?
Titin is a major contributor to passive force, but its role in active force generation is unresolved.
Intact elastic titin filaments act as critical force-transmission networks and activation-dependent springs that buffer forces and maintain A-band stability during muscle contraction.
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Titin cleavage impairs force and sarcomere stability; hypothesis-generating for proteolytic mechanisms in human cardiomyopathy.
Li et al. (2020) studied Healthy (Titin-cleavage mouse model). TEV protease treatment vs. Untreated fibers or wild-type fibers was evaluated on Active force reduction and sarcomere structural integrity. Titin cleavage by TEV protease progressively reduced passive and active muscle forces, including a 46% reduction in active force in homozygous fibers, and caused severe A-band and Z-disk disruption during contraction.
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