Key result
SM22alpha ablation reduces active vascular stress ~40% in depolarised resistance arteries and veins.
Why the study?
The function of the actin-binding protein SM22alpha in arterial contractility and vascular protein synthesis was unknown.
Does ablation of SM22alpha affect arterial contractility and stretch-sensitive vascular protein synthesis in mouse vascular smooth muscle?
Does ablation of SM22alpha affect arterial contractility and stretch-sensitive vascular protein synthesis in mouse vascular smooth muscle?
SM22alpha plays a role in vascular smooth muscle contractility, likely by affecting actin filament organization.
Answers are grounded in this paper and cite their sources.
SM22alpha supports vascular contractility in mice; hypothesis-generating for human disease with no practice implications yet.
The actin-binding protein SM22alpha marks contractile differentiation in smooth muscle, but its function is unknown. We tested its role in arterial contractility and stretch-sensitive vascular protein synthesis. Active stress in depolarised mesenteric resistance arteries and portal veins was reduced by 40% in SM22alpha(-/-) mice. Passive and active arterial circumference-force relationships were shifted leftwards, whereas alpha(1)-adrenergic responses were increased. Actin contents were 10-25% lower in vessels from SM22alpha(-/-) mice, but protein composition was otherwise similar. Synthesis of SM22alpha, calponin and alpha-actin, but not beta-actin, was sensitive to stretch. Ablation of SM22alpha did not affect stretch sensitivity of any of these proteins. Thus, SM22alpha plays a role in contractility, possibly by affecting actin filament organisation.
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Zeidan et al. (2004) studied Vascular smooth muscle contractility. Ablation of SM22alpha vs. Wild-type mice was evaluated on Active stress in depolarised mesenteric resistance arteries and portal veins (40% reduction). Ablation of SM22alpha in mice reduced active stress in depolarised mesenteric resistance arteries and portal veins by 40% and decreased actin contents by 10-25%.
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