Abstract
The inositol trisphosphate receptor (IP3R) is an intracellular calcium channel that mediates the cellular actions of a wide variety of hormones, growth factors, and cytokines. In osteoblastic cell cultures, many bone resorbing hormones increase phosphoinositide turnover, inositol trisphosphate production, mobilization of intracellular calcium, and the secretion of osteoclast recruitment and activating factors. In this study, the effects of 17 beta-estradiol, 1,25-dihydroxyvitamin D3 (1,25(OH)2D3), phrobol ester, and serum on IP3R mRNA levels were evaluated in osteogenic-osteosarcoma cells and in primary osteoblastic cultures derived from neonatal rat calvaria. Type-specific reverse transcription polymerase chain reaction (RT-PCR) indicated that all cell types evaluated (G-292, U-2 OS, Saos-2, MC3T3-E1, UMR-106, and calvarial osteoblastic cells) express IP3R mRNA type I; G-292, U-2 OS, MC3T3-E1, and calvarial osteoblastic cells also express type II IP3R mRNA; and UMR-106 and the calvarial osteoblastic cells express type III IP3R mRNA. Northern blot and RT-PCR analyses of human G-292 osteosarcoma cells and rat calvarial osteoblastic cells showed that phorbol ester and serum increase IP3R mRNA levels, whereas 17 beta-estradiol and...Continue Reading
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