Key result
Partial removal of troponin from rabbit skeletal muscle fibers resulted in Ca2+-insensitive active tension and shifted the tension-pCa relation to higher pCa values by up to 0.3 units.
Population
Skinned fibers from rabbit psoas muscles
Comparison
Partial removal of troponin complexes using… vs Control fiber segments and after recombination…
Design
Preclinical
Authors
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May guide thin-filament studies; leaves open cardiac translation and clinical relevance.
Partial extraction of troponin complexes in rabbit skeletal muscle fibers increases Ca2+ sensitivity, suggesting molecular cooperativity within the thin filament during tension development.
Moss et al. (1986) studied this question. Partial extraction of troponin (Tn) complexes vs. Control fiber segments was evaluated on Ca2+-activated isometric tension and tension-pCa relation. Partial removal of troponin from rabbit skeletal muscle fibers resulted in Ca2+-insensitive active tension and shifted the tension-pCa relation to higher pCa values by up to 0.3 units.
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