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Journal of Cell Science, Vol 107, Issue 7 1973-1984, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

Immunocytochemical detection of extracellular annexin II in cultured human skin keratinocytes and isolation of annexin II isoforms enriched in the extracellular pool

AS Ma, DJ Bell, AA Mittal and HH Harrison
Department of Medicine, University of Chicago, Illinois 60637.

Monoclonal antibodies were raised against trypsinized human skin epidermal cells and selected for their staining of the epidermal cells in a cell periphery pattern. One antibody, CP-1, immunoprecipitated a 36 kDa protein that was identified as annexin II heavy chain by microsequencing of a CNBr-generated peptide fragment from the antigen and by cross-identification with another anti-annexin II antibody. In addition to staining a broad cell periphery band in keratinocytes, CP-1 also detected annexin II outside and in between the top layer cells before cell permeabilization. Double-labeling of annexin II and F-actin revealed a distinct topographical relationship between the two, with intercellular annexin II flanked by the submembranously located actin of the juxta-positioned cells. Annexin II was isolated from cultured keratinocytes via immunoaffinity column chromatography in one step, using the same monoclonal antibody CP-1 and was found to be resolved into multiple isoforms when analyzed by two-dimensional gel electrophoresis. The predominant components of annexin II were basic, with pI of 6.5-8.5, and some of them formed disulfide-linked monomeric multimers under non-reducing conditions. Acidic annexin II isoforms with pI 5.4-5.8 were barely detectable among the total annexin II isolated but were selectively enriched in an extracellular pool created by 0.05% ethylenediaminetetraacetic acid (EDTA) dispersion of the cultured cells into single cell suspensions. Furthermore, they can be separated from the rest of annexin II by using a different elution condition. A 46 kDa protein, the identity of which is unclear, co-eluted with the acidic isoforms in the EDTA washes. These acidic isoforms, which co-eluted with the 46 kDa protein, are suspected of corresponding to the extracellular annexin II detected immunocytochemically.
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