PMID: 3321066Dec 1, 1987Paper

Expression of high and low molecular weight caldesmons during phenotypic modulation of smooth muscle cells

Proceedings of the National Academy of Sciences of the United States of America
N UekiK Higashino

Abstract

We investigated the expression of two molecular weight forms of caldesmon in a wide range of tissues and cells. The distribution of high molecular weight caldesmon (h-caldesmon, Mr 120,000-150,000) was restricted to smooth muscles where it was found in large quantity. The low molecular weight protein (l-caldesmon, Mr 70,000-80,000) was widely distributed in nonmuscle tissues and cells. Therefore, the expression of h-caldesmon might be much more specific to smooth muscles. We then examined the expressional changes of two caldesmons during phenotypic modulation of smooth muscle cells (SMCs). In developing gizzards, the expression of caldesmons switched from the l- to the h-form. Contrarily, the expression turned from h- to l-caldesmon in association with dedifferentiation of aortic SMCs in primary culture. In agreement with these observations, the levels of those mRNAs that direct the synthesis of both caldesmons were apparently in proportion to the quantities of protein, as determined by use of an in vitro translation system. In addition, h-caldesmon in smooth muscle-like BC3H1 cells increased in its amount with a concomitant reduction of l-caldesmon following serum-depleted and contact-inhibited cytodifferentiation. These resul...Continue Reading

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