FEBS Lett. 1987 Apr 6;214(1):135-8.

Brefeldin A arrests the intracellular transport of a precursor of complement C3 before its conversion site in rat hepatocytes.

Oda K, Hirose S, Takami N, Misumi Y, Takatsuki A, Ikehara Y.

Abstract

The effects of brefeldin A on intracellular transport and posttranslational modification of complement C3 (C3) were studied in primary culture of rat hepatocytes. In the control culture C3 was synthesized as a precursor (pro-C3), which was processed to the mature form with alpha- and beta-subunits before its discharge into the medium. In the presence of brefeldin A the secretion of C3 was strongly blocked, resulting in accumulation of pro-C3. However, after a prolonged interval the mature form of C3 was finally secreted. The results indicate that brefeldin A impedes translocation of pro-C3 to the Golgi complex where pro-C3 is converted to the mature form, but not its proteolytic processing, in contrast to the effects of monensin and weakly basic amines.

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