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The effects of active vitamin D3 analogues on radial mineral content (RMC) in postmenopausal osteoporosis were examined. Seventy eight subjects with postmenopausal osteoporosis were divided into 5 groups; Group 1 (n = 23) as the control group and Group 2 (n = 27), Group 3 (n = 8), Group 4 (n = 9) and Group 5 (n = 11) which were given 1 microgram of 1, 24(R) (OH)2D3 per day, 1 microgram of 1, 24(S)(OH)2D3 per day, 0.5 and 1 microgram of 1 alpha-OHD3 per day for 6 to 24 months, respectively. After 3-months administration of these drugs, RMC values were significantly increased in Groups 2 (102.8 +/- 1.8%), 4 (103.9 +/- 3.3%) and 5 (114.2 +/- 3.6%), when compared with the controls (97.9 +/- 2.4%). RMC in Group 3 (97.9 +/- 2.4%) was not significantly different from the control value. The administration of 1 alpha-OHD3 caused in increase in RMC in a dose-related manner. A rapid decrease in RMC was observed after withdrawal of the treatment in Groups 2, 4, and 5. A subsequent increase in RMC was observed after re-administration of 1 alpha-OHD3 and 1, 24(R)(OH)2D3. Serum Ca levels were increased in the group treated with 1, 24(R)(OH)2D3 and were decreased after the discontinuation of 1 alpha-OHD3 administration. Serum A1-P activity was decreased by treatment with 1 alpha-OHD3 (1 microgram per day) and a subsequent increase was observed in both groups treated with 1, 24(R)(OH)2D3 and 1 alpha-OHD3. Serum PTH levels were decreased by the administration of 1, 24(R)(OH)2D3 and 1 alpha-OHD3. In the group treated with 1 microgram of 1 alpha-OHD3 per day, hypercalcemia (2 out of 11 cases and these patients took calcium tablets) and an increase in BUN (1 out of 2 hypercalcemic patients) were observed.(ABSTRACT TRUNCATED AT 250 WORDS)

endocrinologia japonica

Long-term treatment of postmenopausal osteoporosis with active vitamin D3, 1-alpha-hydroxycholecalciferol (1.ALPHA.-OHD3) and 1,24 dihydroxycholecalciferol (1,24(OH)2D3).