Intraluminal pressure is essential for the maintenance of smooth muscle caldesmon and filamin content in aortic organ culture

Arteriosclerosis, Thrombosis, and Vascular Biology
K G BirukovAlain Tedgui

Abstract

Different forms of mechanical stimulation are among the physiological factors constantly acting on the vessel wall. We previously demonstrated that subjecting vascular smooth muscle cells (VSMCs) in culture to cyclic stretch increased the expression of high-molecular-weight caldesmon, a marker protein of a differentiated, contractile, VSMC phenotype. In the present work the effects of mechanical factors, in the form of circumferential stress and shear stress, on the characteristics of SM contractile phenotype were studied in an organ culture of rabbit aorta. Application of an intralumininal pressure of 80 mm Hg to aortic segments cultured in Dulbecco's modified Eagle's medium containing 20% fetal calf serum for 3 days prevented the decrease in high-molecular-weight caldesmon content (70+/-4% of initial level in nonpressurized vessel, 116+/-17% at 80 mm Hg) and filamin content (80+/-5% in nonpressurized vessel, 100+/-2% at 80 mm Hg). SM myosin and low-molecular-weight caldesmon contents showed no dependence on vessel pressurization. Neither endothelial denudation nor alteration of intraluminal flow rates affected marker protein content in 3-day vessel culture, thus excluding the possibility of any shear or endothelial effects. M...Continue Reading

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