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Departments of 1 Research and 2 Medicine, Saint Francis Hospital and Medical Center, Hartford, 06105; and 3 School of Medicine, University of Connecticut, Farmington, Connecticut 06030
Glucocorticoids have important effects
on osteoblastic function. Connective tissue growth factor
(CTGF)/insulin-like growth factor binding protein-related protein 2 (IGFBP-rP2) plays a role in cell adhesion and function. We examined the
regulation of CTGF/IGFBP-rP2 synthesis in cultures of
osteoblast-enriched cells from 22-day fetal rat calvariae (Ob cells).
Cortisol caused a time- and dose-dependent increase in CTGF/IGFBP-rP2
mRNA levels in Ob cells. Cycloheximide did not preclude the effect,
indicating that it was not protein synthesis dependent. Cortisol
increased the rate of CTGF/IGFBP-rP2 transcription and, in
transcriptionally arrested Ob cells, did not modify the decay of the
transcript. Parathyroid hormone decreased, whereas transforming growth
factor-
and, to a lesser extent, bone morphogenetic protein 2 increased CTGF/IGFBP-rP2 mRNA levels, but other hormones and growth
factors had no effect. In conclusion, cortisol stimulates
CTGF/IGFBP-rP2 transcription in Ob cells. Because CTGF/IGFBP-rP2 binds
IGFs, its increased expression could be relevant to the actions of
cortisol in bone.
skeletal cells; insulin-like growth factor; insulin-like growth factor binding proteins; glucocorticoids; bone formation
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