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• W2057403485 abstract "Thiazide diuretics have been shown to decrease bone-loss rate and to improve bone mineral density in patients using this medication. However, the exact role of thiazides on bone cells is still debated. In the present work, we studied whether thiazides could affect the normal features of osteoblasts using the human model cell line MG-63. Hydrochlorothiazide (HCTZ) did not affect cell growth nor DNA synthesis in these cells, yet slightly increased alkaline phosphatase activity in these cells at pharmacologically relevant concentrations. Under similar conditions, HCTZ dose-dependently inhibited 1,25(OH)2D3-induced osteocalcin secretion by these cells (maximal effect, -40 to 50%, P < 0.005). However, HCTZ did not inhibit the basal production of osteocalcin in MG-63 cells (without 1,25(OH)2D3 induction), which was very low to undectable. Two different thiazide derivatives, chlorothiazide and cyclothiazide, and two structurally related sulfonamides with selective inhibition of carbonic anhydrase (Acetazolamide) or hyperglycemic effects (Diazoxide) were also tested. Chlorothiazide (1000 microM) inhibited osteocalcin secretion (-42 +/- 12.7%) at doses 10-fold higher than HCTZ (100 microM) while cyclothiazide was effective at doses of 1 microM (-27 +/- 3.6%), and hence 100-fold lower than HCTZ, compatible with the relative natriuretic effect in vivo of these compounds. Acetazolamide (10 microM) poorly affected osteocalcin secretion at doses 100-fold higher than those needed in vivo to inhibit carbonic anhydrase. Likewise, Diazoxide (100 microM) poorly affected osteocalcin secretion at doses known to promote its biological effect. Higher doses of acetazolamide and diazoxide induced cell death. Neither Acetazolamide nor Diazoxide affected alkaline phosphatase, whereas chlorothiazide had a weak positive effect on this enzymatic activity. The production of macrophage colony-stimulating factor (M-CSF) was stimulated in the presence of 1,25(OH)2D3 (50 nM), TNF-alpha (2 ng/ml) or both in MG-63 cells. HCTZ (25 microM, 24 hr of preincubation) did not modify basal M-CSF production and did not reduce the response to 1,25(OH)2D3 alone. In contrast, HCTZ inhibited the response to TNF-alpha alone (P < 0.05), and also reduced the response to a combination of 1,25(OH)2D3 and TNF-alpha (P < 0.01). In conclusion, these results indicate that thiazide diuretics show a selective inhibition of osteocalcin secretion and M-CSF production by MG-63 cells unlike structurally related drugs. Therefore, these features may explain, in part, the positive effect of thiazides on bone mineral density." @default.
• W2057403485 created "2016-06-24" @default.
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• W2057403485 date "1996-11-01" @default.
• W2057403485 modified "2023-10-18" @default.
• W2057403485 title "Selective effect of thiazides on the human osteoblast-like cell line MG-63" @default.
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• W2057403485 doi "https://doi.org/10.1038/ki.1996.461" @default.
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