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- W2082461100 abstract "We investigated the role of 3,5,3'-tri-iodothyronine (T3) in regulating differentiation of osteoprogenitor cells and also studied the effects of the glucocorticoid hormone dexamethasone (Dex) on the T3-induced effects on osteoprogenitor populations. This was done by determining the effects of either hormone alone, or of combinations of the two hormones, on the number of bone nodules formed in long-term cultures of rat calvaria cells. In this system, Dex has been shown to increase bone nodule formation, the maximal effective dose being 10 nM (Bellows et al. Endocrinology 121: 1985-1992; 1987). In standard culture medium containing 15% fetal bovine serum FBS), low concentrations of T3 (0.001-0.1 nM) had no effect on the number of bone nodules, while higher concentrations of 1-100 nM inhibited. However, in culture medium containing 10 nM Dex, the lower concentrations of T3 markedly increased the number of nodules. Short term pulse experiments with these low concentrations of T3 in the presence of Dex indicated that stimulation of nodule formation occurred only when T3 was present prior to confluency. Higher concentrations of T3 (1-100 nM) decreased nodule number whether or not Dex was added. We then cultured cells in medium containing FBS from which T3 and T4 were removed by treatment with AG-1 chi-10 resin. In both + or - Dex conditions, bone nodule formulation was increased 1.5 to 2-fold in T3, T4-depleted medium when compared with cultures maintained in standard culture medium.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2082461100 date "1995-05-01" @default.
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- W2082461100 title "Tri-iodothyronine (T3) and dexamethasone interact to modulate osteoprogenitor cell differentiation in fetal rat calvaria cell cultures" @default.
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- W2082461100 doi "https://doi.org/10.1016/8756-3282(95)00102-j" @default.
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