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Adult growth hormone deficiency (AGHD) is associated with osteoporosis. Reports have associated parathyroid hormone (PTH) circadian rhythm abnormalities with osteoporosis. Furthermore, there is evidence of relative PTH insensitivity in AGHD patients. Factors regulating PTH circadian rhythm are...
Osteoporosis is believed to result from interplay among multiple environmental and genetic determinants, including factors that regulate bone mineral density (BMD). Among those factors, adequate estrogen is essential for achievement of peak bone mass as well as for postmenopausal maintenance of...
Nitric oxide (NO) may modulate estrogen’s anabolic effects on bone homeostasis by restraining osteoclast-mediated bone resorption and stimulation of osteoblast activity. Accordingly, NO donated by organic nitrates, including nitroglycerin, is thought to protect against bone loss associated with...
In adult human beings, remodeling creates nearly all of new bone tissue. However, Frost hypothesized that modeling can go on in trabeculae throughout life. As this hypothesis has not been verified, we looked for histologic evidence of trabecular modeling (minimodeling) during bone...
Estrogen is essential for bone growth and development and for the maintenance of bone health in adulthood. The cellular responses of osteoblasts and osteoclasts to estrogen are initiated via two high-affinity receptors (ERs). Osteoblasts synthesize RANKL (receptor activator of NF-κB ligand),...
Noggin is a glycoprotein that binds bone morphogenetic proteins (BMPs) selectively and, when added to osteoblasts, it opposes the effects of BMPs. However, the consequences of its continued expression in stromal cells are not known. We investigated the effects of noggin overexpression under the...
The prevalence of vertebral deformity, estimated in lateral spine radiographs (Th4–L4) using quantitative morphometry, in 64 men and 132 women with hip fractures was compared with the prevalence of vertebral deformity in individuals in two population-based studies. A vertebral deformity of a...
Despite the obvious epidemiological significance of bone size (BS) and geometry (BG) traits as risk factors for osteoporotic fracture, very little is still known concerning the extent of their genetic determination. In the present paper we report the results of quantitative genetic analysis of a...
Limited placebo-controlled data are available to assess the long-term fracture efficacy of bisphosphonates. In order to determine the effects of 5 years of risedronate treatment, we extended a 3-year, placebo-controlled vertebral fracture study in osteoporotic women for an additional 2 years;...
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