Co-operative interactions between troponin-tropomyosin units extend the length of the thin filament in skeletal muscle
Key result
TnC extraction reduces tension and interrupts co-operativity transmission by dividing regulatory strands into independent systems.
Population
Permeabilized (chemically skinned) rabbit psoas fibers
Comparison
Extraction of troponin C (TnC) vs Intact systems of 26 regulatory units
Design
Preclinical
Authors
Discussion
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Member takes
Implication
Provides mechanistic insight into skeletal muscle regulation; leaves open extension to cardiac muscle and human disease.
Structured PICO
P
Population
Permeabilized (chemically skinned) rabbit psoas fibers
I
Intervention
Extraction of troponin C (TnC)
C
Comparator
Intact systems of 26 regulatory units (unextracted fibers)
O
Outcome
Tension/Ca2+ relationship (co-operativity and tension)surrogate
Demonstrates that troponin-tropomyosin complexes in skeletal muscle act as a co-operative system, where extraction of TnC interrupts co-operativity and reduces tension.
Cite This Study
Brandt et al. (1987) studied Skeletal muscle contraction. Extraction of troponin C (TnC) vs. Intact systems was evaluated on Co-operativity of the tension/Ca2+ relationship and tension. Extraction of troponin C from rabbit psoas fibers reduces tension and interrupts the transmission of co-operativity by dividing the regulatory strand into smaller, independent co-operative systems.