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Progesterone-mediated stimulation of osteoprogenitor proliferation and differentiation in cell populations derived from adult or fetal rat bone tissue depends on the serum component of the culture media

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Abstract

We have shown previously that progesterone (Prog) and dexamethasone (Dex) stimulate osteoprogenitor proliferation and differentiation in cell populations derived from adult rat vertebrae and in primary cultures of fetal rat calvariae. In these two in vitro systems, osteoprogenitors can be identified by the appearance of colonies of differentiated osteoblasts producing bone (bone nodule formation). Culture conditions supporting proliferation and differentiation of osteoprogenitors include a requirement for the presence of serum in the culture media. Our major interest in the present study was to investigate whether Prog- and Dex-mediated osteoprogenitor proliferation and differentiation was observed to the same degree in different lots of fetal bovine serum (FBS). In addition, we wanted to investigate whether osteoprogenitors present in cell populations derived from fetal calvarial bone and those present in populations derived from adult vertebral bone would respond similarly under the different culture conditions. We found that, in populations derived from adult rat vertebrae, the effects of the serum component of the culture medium on the number of bone nodules induced by Prog and on the dose-dependency of the Prog effect were striking: in culture media containing the most effective serum the number of bone nodules was 22-fold higher than that in the least effective serum. In addition, Prog responses were detectable at 10−5 M only in some sera but were significant at 10−7 M in others. The effect of Dex in the adult rat vertebrae-derived populations was much less dependent on the serum used: the number of bone nodules in culture media containing the most effective serum was only 1.3 times greater than that in media containing the least effective serum. In cell populations derived from fetal calvariae, the serum dependence of the Prog response was less pronounced: a 4.3-fold increase over control was observed in the most effective serum, and a 2.4-fold increase in the least effective serum. No effects of the serum component of the culture medium on the Dex response were detectable. Thus, Prog-induced bone nodule formation appears to be strongly dependent on the particular type of FBS used for osteoprogenitors present in bone cell populations derived from adult rat vertebrae but much less so in populations obtained from fetal rat calvariae. Preliminary experiments suggest that the estrogen content of the culture media may be one of the determinants regulating Prog responsiveness of the osteoprogenitors. Dex-induced proliferation and differentiation of osteoprogenitors in bone cell populations derived from both adult rat vertebrae and fetal rat calvariae, on the other hand, did not appear to be strongly dependant on factor(s) present in the FBS component of the culture medium.

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Ishida, Y., Bellows, C.G., Tertinegg, I. et al. Progesterone-mediated stimulation of osteoprogenitor proliferation and differentiation in cell populations derived from adult or fetal rat bone tissue depends on the serum component of the culture media. Osteoporosis Int 7, 323–330 (1997). https://doi.org/10.1007/BF01623772

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  • DOI: https://doi.org/10.1007/BF01623772

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