Instability of pleomorphic tubulin paracrystals artificially induced by Vinca alkaloids in tissue‐cultured cells
作者:
Hideki Takanari,
Toshimichi Yosida,
Joji Morita,
Kosaku Izutsu,
Tadahiro Ito,
期刊:
Biology of the Cell
(WILEY Available online 1990)
卷期:
Volume 70,
issue 1‐2
页码: 83-90
ISSN:0248-4900
年代: 1990
DOI:10.1016/0248-4900(90)90363-8
出版商: Blackwell Publishing Ltd
关键词: tubulin paracrystal;Vinca alkaloid;colchicine;colcemid
数据来源: WILEY
摘要:
Summary—The processes of tubulin paracrystal induction in Chinese hamster ovary cells treated with a Vinca alkaloid,ie, vinblastine or vincristine, and treated simultaneously with one of the Vinca alkaloids and colcemid or colchicine were followed by four different microscopic techniques, in particular by tubulin‐immunofluorescence. Vinca alkaloid alone, in lower concentrations, induced basically tactoid or needle‐shaped (N‐shaped) paracrystals. However, the formation of crystalloid was greatly enhanced by increasing the concentration of Vinca alkaloid. Square or barrel‐shaped (S‐shaped) and hexagonal paracrystals were also commonly induced by simultaneous treatment with a Vinca alkaloid and colcemid or colchicine. Large rectangular paracrystals often displayed fibrillar or lamellar fine structures which ran perpendicular to the long axis but tended to cleave into fragments by spontaneous splitting. Electron micrographs revealed the fine structure of crystalloids to be aggregates of numerous filaments. The growth of paracrystals, particularly N‐shaped crystals, was markedly inhibited when cells were exposed to drug(s) at a low temperature (4°C). We confirmed that both N‐ and S‐shaped paracrystals dissociated rapidly after the culture medium was replaced with fresh, drug‐free medium. Glutaraldehyde‐fixed paracrystals treated with RNase solution were stained with acridine orange, showing a weak orange color. Possible factors involved in the assembly and disassembly of tubulin para
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