The detection of subclasses of granulosa cells with differing responsiveness to EGF, FGF, and gonadotropin preparations using an anchorage-independent clonal agar assay |
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Authors: | I Bertoncello T R Bradley |
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Abstract: | Subpopulations of granulosa cells of differing responsiveness to epidermal growth factor (EGF), fibroblast growth factor (FGF), pituitary gonadotropin preparations, and rat erythrocyte suspensions (RBC) have been detected using an anchorage-independent clonal agar assay. All growth factor preparations were capable of enhancing colony formation when added alone, and elicited cloning efficiencies as high as 35% when added to the culture system at optimal concentrations in a variety of combinations. The FGF preparation was the single most effective stimulator of colony formation, augmenting both colony numbers and colony size at concentrations as low as 50 ng/ml. However, unlike the other growth factors in this assay system, a plateau in responsiveness could not be reached even at levels as high as 1 microgram/ml. NIH-FSH-P2 and NIAMMD-bLH-4 were considerably less potent than other growth factors. Both preparations were inactive at concentrations less than 1 microgram/ml and produced an optimal response at 10 micrograms/ml. |
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