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In Vitro
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Selective inhibition of transcytosis by brefeldin A in MDCK cells.
Cell 1991 November 2
Treatment of most cells with brefeldin A (BFA) leads to the retrieval of the Golgi complex to the endoplasmic reticulum, presumably reflecting an inhibition of cytoplasmic coat protein binding to Golgi membranes. Although BFA has been thought to act only on biosynthetic organelles, we now show that this drug also reversibly blocks polymeric immunoglobulin receptor-mediated transcytosis in MDCK cells. The action of BFA on transcytosis was selective, since internalization, recycling, and intracellular degradation were unaffected. The block occurred early on the transcytotic pathway, probably before the translocation of IgA-containing vesicles from the basal to the apical cytoplasm. Although BFA caused MDCK cell endosomes to become more tubular, the organization of the Golgi and binding of the 110 kd Golgi coat protein beta-COP was surprisingly unaffected. These results suggest that in MDCK cells, endocytic organelles contain a BFA-sensitive coat that regulates their organization and function even though the Golgi coat is BFA resistant.
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