Distribution of entactin in the basement membrane of the rat mammary gland. Evidence for a non-epithelial origin

Experimental Cell Research
M J WarburtonA E Chung

Abstract

Entactin, a sulfated glycoprotein with a molecular weight (MW) of about 150 kD, is present in vascular basement membranes and in the interstitial connective tissue of the mammary glands of virgin rats. It does not appear to be present in the basement membrane surrounding the mammary ductal system. However, in lactating mammary glands entactin is also present in the basement membrane region surrounding the secretory alveoli. Ultrastructural localisation of entactin reveals that it is present on the basal surface of epithelial cells, with patchy staining in the lamina lucida and lamina densa. Entactin also appears to be associated with interstitial collagen fibres. Mammary fibroblastic cells in culture are able to produce entactin, whereas mammary epithelial and myoepithelial cells, which synthesise the basement membrane proteins laminin and type IV collagen, fail to synthesise entactin.

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