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Detection and partial characterization of a developmentally regulated nuclear antigen in neural cells in vitro and in vivo

K Schilling, C Duvernoy, S Keck and C Pilgrim

Abteilung Anatomie und Zellbiologie der Universitat Ulm, West Germany.

We report that a monoclonal antibody directed against phosphorylated neurofilaments (SMI 31) recognizes nuclear antigens present in embryonic but not in adult neural cells. On Western blots, the antibody reacts with four proteins of apparent MW 35, 37, 52/54, and 250 KD which are found exclusively in developing brain tissue. These nuclear antigens are expressed by glial and neuronal cells. Both nuclear staining and immunoreactive proteins decrease with ongoing in vitro differentiation. A computer search for proteins that share the epitope recognized by antibody SMI 31 did not yield any proteins of known nuclear localization that exhibit the same molecular weights and solubility characteristics as the above immunoreactive proteins. We conclude that antibody SMI 31 recognizes hitherto unknown nuclear proteins which, in neural cells, are developmentally regulated.

Volume 37, Issue 2, pp. 241-247, 02/01/1989
Copyright © 1989 by The Histochemical Society


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