Biochemical identification and immunological localization of two non-keratin polypeptides associated with the terminal differentiation of avian scale epidermis |
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Authors: | Loren W Knapp Paul J Linser Wayne E Carver Roger H Sawyer |
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Institution: | (1) Department of Biological Sciences, University of South Carolina, 29208 Columbia, SC, USA;(2) Institute for Biological Research and Technology, University of South Carolina, 29208 Columbia, SC, USA;(3) C.V. Whitney Laboratory, University of Florida, 32086 St. Augustine, FL, USA;(4) Department of Anatomy, University of South Carolina Medical School, 29201 Columbia, SC, USA |
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Abstract: | Summary The expression of two previously uncharacterized polypeptides produced in epidermal cells of chick reticulate and scutate scales during late embryonic scale histogenesis and in hatchling birds has been studied biochemically and immunologically. These polypeptides have been identified by two-dimensional pH gradient gel electrophoresis as basic in charge, with apparent molecular weights of 20 and 23 kD, and they have been characterized immunologically and by amino acid analysis as non-keratin in nature. Monoclonal antibodies which react with both polypeptides have been used for immunohistochemical and immunogold electron-microscopic localization. Immunoreactivity was observed in suprabasal cells of reticulate scale epidermis, where it codistributed with bundles of -type cytokeratins in the -keratin-rich layers of epidermis known as the alpha stratum and in suprabasal cells of the outer epidermal surface of scutate scales, where it codistributed with -and -type keratin filament bundles in the -keratin-rich layers of epidermis known as the beta stratum. |
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Keywords: | Cornification Cytokeratin-associated proteins -Keratin" target="_blank">gif" alt="agr" align="BASELINE" BORDER="0">-Keratin -Keratin" target="_blank">gif" alt="beta" align="MIDDLE" BORDER="0">-Keratin Epidermis Komestic fowl |
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