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The Journal of Cell Biology, Vol 98, 2035-2046, Copyright © 1984 by The Rockefeller University Press

ARTICLES

Endogenous and monoclonal antibodies to the rat pancreatic acinar cell Golgi complex

ZD Smith, F D'Eugenio-Gumkowski, K Yanagisawa and JD Jamieson

Normal, unimmunized mouse serum from several strains (BALB/c, C57/b, DBA/2, NZB, SJL, CD/1) contains an endogenous IgG antibody that localizes to the Golgi complex of rat pancreatic acinar cells. Treatment of pancreatic acini with 5 microM monensin resulted in the swelling and vacuolization of the Golgi cisternae, and in a corresponding annular staining by the mouse serum as observed by immunofluorescence, suggesting that the antigen recognized is on the Golgi complex cisternal membrane. The antiserum did not react with pancreatic secretory proteins, and its binding to smooth microsomal membranes was retained following sodium carbonate washing, supporting a Golgi membrane localization. Advantage was taken of the existence of the endogenous murine antibody for the isolation of monoclonal antibodies directed to the Golgi complex of the rat pancreas. Two antibodies, antiGolgi 1 and antiGolgi 2, are described. Both antibodies are IgMs that recognize integral membrane proteins of the trans-Golgi cisternae, with lighter and patchy staining of the pancreatic lumen membrane, as observed both by light and electron microscopy. AntiGolgi 1 recognizes predominately a protein of molecular weight 103,000- 108,000, whereas antiGolgi 2 shows a strong reaction to a 180-kd band as well as the 103-108-kd protein.
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