title: Mepanipyrim, a novel inhibitor of pharmacologically induced Golgi dispersion.
abstract: Mepanipyrim inhibited retrograde Golgi-to-ER trafficking induced by brefeldin A (BFA), nordihydroguaiaretic acid, clofibrate, and arachidonyltrifluoromethyl ketone in NRK and other types of cells, but did not inhibit anterograde trafficking of Golgi-resident proteins translocated to ER by BFA and newly synthesized VSV-G. However, mepanipyrim did not block the TGN38 dispersion induced by any of these compounds. Mepanipyrim acted on the Golgi, and swollen vesicular Golgi structures were formed and similar structures accumulated during rebuilding of the Golgi after BFA removal. These actions of mepanipyrim were readily reversed after its removal. Mepanipyrim did not stabilize microtubules, but prevented nocodazole-induced fragmentation and dispersion of the Golgi. These results suggest that the mepanipyrim-sensitive molecules participated in stabilizing the Golgi and its anchoring in the perinuclear region, and equally importantly, that the novel action of mepanipyrim may be used as a pharmacological tool for investigating membrane transport, Golgi membrane dynamics, and differentiation of the Golgi from TGN.
authors.affiliation: Animal and Cellular Systems Laboratory, RIKEN, The Institute of Physical and Chemical Research, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Michiko
authors.initials: M
authors.lastname: Nakamura
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Kono
authors.forename: Akira
authors.initials: A
authors.lastname: Takatsuki
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D015153:Blotting, Western; D020126:Brefeldin A / Q000037:antagonists & inhibitors / Q000494:pharmacology; D002352:Carrier Proteins / Q000378:metabolism; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D005456:Fluorescent Dyes; D005659:Fungicides, Industrial / Q000494:pharmacology*; D006801:Humans; D009637:Masoprocol / Q000494:pharmacology; D051379:Mice; D008856:Microscopy, Fluorescence; D008870:Microtubules / Q000187:drug effects / Q000378:metabolism; D015739:Nocodazole / Q000037:antagonists & inhibitors / Q000494:pharmacology; D009844:Oligosaccharides / Q000378:metabolism; D011743:Pyrimidines / Q000494:pharmacology*; D021601:trans-Golgi Network / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D002352:Carrier Proteins; D005456:Fluorescent Dyes; D005659:Fungicides, Industrial; D009844:Oligosaccharides; D011743:Pyrimidines; D020126:Brefeldin A; D009637:Masoprocol; C104083:mepanipyrim; D015739:Nocodazole