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- W2142749013 abstract "The possible relationship between calcium and microtubules in the regulation of granulosa cell steroidogenesis was assessed by using agents known to alter microtubule-tubulin equilibrium together with the ionophore A23187, an antibiotic that facilitates the movement of calcium across plasma membranes. Using immunofluorescence and morphometric analysis, we determined alterations in microtubule organization and overall cell shape, respectively, in response to ionophore-stimulated production of progesterone and 20 alpha-hydroxypregn-4-en-3-one (20 alpha-OH-progesterone) during 24 h of culture. In addition, the influences of colchicine and nocodazole, two agents known to induce microtubule depolymerization, and of taxol, an agent that stabilizes tubulin polymers, on calcium-dependent regulation of granulosa cell progestin production in vitro were examined. Cells cultured as controls were flattened, highly irregular in outline, and associated with a complexly organized, well-spread cytoplasmic network of microtubules. In contrast, those maintained in the presence of increasing concentrations of ionophore were progressively more circular and smooth in outline, occupied less area on the growth surface, and contained cytoplasmic arrays of microtubules considerably less extensive than those of the controls and occupying areas defined by the more regular cellular perimeters. While progestin production in the absence or presence of a submaximally stimulatory concentration of A23187 was increased by both colchicine and nocodazole, the microtubule-depolymerizing agents had little to no effect on the production of the steroids by granulosa cells maximally stimulated by the ionophore. However, both basal and ionophore-induced progestin production were unaltered by taxol except at a concentration of 10 microM in the presence of 0.25 micrograms/ml A23187.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2142749013 created "2016-06-24" @default.
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- W2142749013 date "1987-05-01" @default.
- W2142749013 modified "2023-09-24" @default.
- W2142749013 title "Microtubules and the Calcium-Dependent Regulation of Rat Granulosa Cell Steroidogenesis1" @default.
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- W2142749013 doi "https://doi.org/10.1095/biolreprod36.4.1007" @default.
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