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- W2076480954 abstract "To understand better the role of the microtubular system in the development and maintenance of morphological organization of nonpolarized and polarized cells of the same origin we examined the effects of two microtubule-specific drugs, colcemid and taxol, on discoid cultured epithelial rat cells of the IAR-2 line and on polarized cells obtained from this line by transfection of mutated N-ras oncogene; morphometric, immunomorphologic, and videomicroscopic methods were used. Depolymerization of microtubules by colcemid did not cause major changes in the discoid shape of IAR cells but altered organization of actin cortex; in particular, it led to disappearance of circumferential bundle of actin microfilaments. Taxol reorganized the normal network of microtubules radiating from the perinuclear centers into numerous arrays of short microtubules not associated with any centers. Taxol-treated cells had wider circumferential bundles of microfilaments than control cells and morphometric analysis showed that their contours were closer to geometric circle than those of control or of colcemid-treated cells. These data show that function of the microtubular system is essential for maintenance of the characteristic morphological organization of discoid cells; we propose to name this function contra-polarization. Contra-polarization is not prevented and is even promoted by taxol; this result suggests that a decentralized system of microtubules is sufficient for this function. In contrast, maintenance of polarized morphology of IAR-2 cells transfected by the N-ras oncogene is inhibited not only by colcemid but also by taxol and thus requires the presence of a normal centralized microtubular system." @default.
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- W2076480954 date "1994-08-30" @default.
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- W2076480954 title "Role of the microtubular system in morphological organization of normal and oncogene-transfected epithelial cells." @default.
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- W2076480954 doi "https://doi.org/10.1073/pnas.91.18.8597" @default.
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