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pubmed-article:8432789pubmed:abstractTextGlucocorticoid administration is a well established cause of osteopenia. Mechanisms underlying the deleterious effect of glucocorticoids on bone may include direct inhibition of bone formation as well as indirect effects through changes in intestinal calcium absorption, renal calcium excretion, and/or levels of the calciotropic hormones. To further examine the potential role of the calciotropic hormones we measured serum levels of PTH and 1,25 dihydroxyvitamin D [1,25(OH)2D], as well as serum and urine levels of calcium and vertebral bone density in patients with chronic obstructive pulmonary disease being managed with or without prednisone. Patients treated with prednisone had lower spinal bone density (53 vs. 106 mg/cm3) and higher serum calcium (2.40 vs. 2.33 mmol/l), urine calcium (6.9 vs. 2.7 mmol/24h), and 1,25(OH)2D levels (147 vs. 95 pmol/L). Compared to the patients not treated with glucocorticoids. PTH levels also tended to be higher (33 vs. 26 microliters-eq/ml), but the difference was not significant. Serum and urine calcium levels correlated positively with 1,25(OH)2D levels, but none of these measurements correlated with PTH levels. Our results suggest that prednisone treatment alters the regulation of 1,25(OH)2D production, and this may contribute to the loss of bone mineral induced by prednisone.lld:pubmed
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pubmed-article:8432789pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:8432789pubmed:articleTitleElevated 1,25-dihydroxyvitamin D levels in patients with chronic obstructive pulmonary disease treated with prednisone.lld:pubmed
pubmed-article:8432789pubmed:affiliationEndocrine Unit, VA Medical Center, San Francisco, California.lld:pubmed
pubmed-article:8432789pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8432789pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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