Myoepithelial cell differentiation in the developing mammary gland: progressive acquisition of smooth muscle phenotype

Developmental Dynamics : an Official Publication of the American Association of Anatomists
M A DeugnierM A Glukhova

Abstract

The most important portion of the mammary gland development occurs postnatally, with distinct periods of intensive morphogenesis taking place between birth and puberty and during pregnancy and lactation. To characterize the differentiation process of mammary myoepithelial cells, we have studied the expression patterns of several smooth muscle phenotypic markers, including contractile proteins, alpha-smooth muscle-actin (alpha-SM-actin), smooth muscle myosin heavy chains (SM-MHC), and calponin; components of cell-extracellular matrix adherens junctions, phosphoglucomutase-related protein (PGM), vinculin variants, integrin subunits; and laminin variant chains in the developing rat mammary gland using immunofluorescence microscopy. alpha-SM-actin- and SM-MHC-positive cells were found first in newborn animals, while calponin, PGM and alpha1 integrin subunit began to be expressed in prepubertal animals (1.5 weeks). Vinculin, beta1 and alpha3 integrin subunits were largely confined to the basal cell layer at all developmental stages examined with greater staining starting at 1.5 weeks. Meta-vinculin was identified only in myoepithelial cells of the lactating gland. gamma1 laminin chain was present in the mammary gland basement membra...Continue Reading

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Citations

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