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Prolonged exposure to excessive levels of endogenous or exogenous glucocorticoids is associated with serious clinical features including altered body composition and the development of insulin resistance, impaired glucose tolerance and diabetes. It had been assumed that these adverse effects were mediated by direct effects of glucocorticoids on tissues such as adipose or liver. Recent studies have...
In prostate cancer metastases to bone, cancer cell-derived cytokines stimulate RANKL expression by cells of the osteoblast lineage, which in turn activates osteoclastic bone resorption. However, it is unclear whether cells of the osteoblast lineage signal back to prostate cancer cells, and if so, whether such direct cross-talk can be targeted therapeutically. Using the human prostate cancer cell line,...
The pathogenesis of glucocorticoid-induced osteoporosis remains ill defined. In this study, we examined the role of the osteoblast in mediating the effects of exogenous glucocorticoids on cortical and trabecular bone, employing the Col2.3-11βHSD2 transgenic mouse model of osteoblast-targeted disruption of glucocorticoid signalling.Eight week-old male transgenic (tg) and wild-type (WT) mice (n=20–23/group)...
The role of endogenous glucocorticosteroids (GC) in bone development is ill-defined. Using the Col2.3-11βHSD2 transgenic (tg) mouse model, we examined the effect of osteoblast-targeted disruption of intracellular GC signalling on bone growth and strength, and its modulation by factors such as age, gender and skeletal site.Tibiae and L3 vertebrae of 3 and 7-week-old, male and female wild type (WT)...
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