Population
Isoform-specific gene knockout mouse in which SM-B myosin is permanently replaced by SM-A myosin
Comparison
Genetic knockout of SM-B myosin vs Wild-type animals
Design
Preclinical
Key result
Permanent replacement of SM-B myosin by SM-A myosin in mice led to decreased velocity of shortening and increased isometric force generation in mesenteric vessels and aorta.
Authors
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Hypothesis-generating for myosin isoform effects on vascular tone; requires confirmation in human tissues before clinical relevance.
Loss of SM-B myosin in vascular smooth muscle decreases shortening velocity, increases isometric force, and alters thin filament regulatory protein expression.
Babu et al. (2004) studied Vascular smooth muscle contractile properties. SM-B myosin knockout (replacement by SM-A myosin) vs. Wild-type animals was evaluated on Contractile properties of vascular smooth muscle (velocity of shortening and isometric force generation). Permanent replacement of SM-B myosin by SM-A myosin in mice led to decreased velocity of shortening and increased isometric force generation in mesenteric vessels and aorta.