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Distribution of alpha 6 integrin subunit in developing mouse submandibular gland

Y Kadoya and S Yamashina

Department of Anatomy, Kitasato University School of Medicine, Sagamihara, Japan.

We examined the development of mouse submandibular gland by light and electron microscopy and determined the distribution of the alpha 6 integrin subunit and laminin in this process by immunofluorescence and immunoelectron microscopy. At Days 13.5 and 14 of gestation alpha 6 was localized over the entire cell surface of undifferentiated epithelial cells of the terminal cluster. On Day 15 the expression of alpha 6 could no longer be detected over central cells in the proximal portion of branched terminal cluster, whereas peripheral cells were stained over the entire surface. On Day 17 of gestation to day of birth, alpha 6 expression was restricted to the basolateral surface of the differentiated acinotubular structure. Its expression on acinar cells was uniformly distributed throughout the basolateral membrane, but on duct cells stronger staining towards the basal surface was noted. Similar expression was observed in adult acinar and duct cells. Expression of the alpha 6-subunit at the cell-cell contact in an early stage and its expression at the basolateral surface in an advanced stage indicate that integrin containing alpha 6 plays a significant role in cell-cell and cell-substrate interaction. Stage and cell type- specific change of integrin expression may be significant for submandibular development.

Volume 41, Issue 11, pp. 1707-1714, 11/01/1993
Copyright © 1993 by The Histochemical Society


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E. W. Gresik, M. Kashimata, Y. Kadoya, R. Mathews, N. Minami, and S. Yamashina
Expression of Epidermal Growth Factor Receptor in Fetal Mouse Submandibular Gland Detected by a Biotinyltyramide-based Catalyzed Signal Amplification Method
J. Histochem. Cytochem., December 1, 1997; 45(12): 1651 - 1658.
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