Metabolic acidosis up-regulates PTH/PTHrP receptors in UMR 106-01 osteoblast-like cells.
Metabolic acidosis up-regulates PTH/PTHrP receptors in UMR 106-01 osteoblast-like cells.
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代谢性酸中毒上调 UMR 106-01 成骨细胞样细胞中的 PTH/PTHrP 受体。
DOI:
10.1111/j.1523-1755.2002.kid568.x
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发表时间:
2002
期刊:
影响因子:
--
通讯作者:
Gonzalez,EstherA
中科院分区:
文献类型:
--
作者:
Disthabanchong,Sinee;Martin,KevinJ;McConkey,CharlesL;Gonzalez,EstherA
Metabolic acidosis up-regulates PTH/PTHrP receptors in UMR 106-01 osteoblast-like cells.BackgroundMetabolic acidosis results in skeletal demineralization by multiple mechanisms. One of these involves the inorganic phase of bone by which hydrogen ion is buffered by bone carbonate. In addition, the cellular components of bone participate by the induction and repression of several skeletal genes. Previous studies have suggested that the action of parathyroid hormone (PTH), a major regulator of bone turnover, might be altered by acidosis. The present studies were designed to test directly, in vitro, whether acidosis altered the effects of PTH in UMR 106-01 osteoblast-like cells.MethodsStudies were conducted in confluent cultures of UMR 106-01 cells in modified Eagle's medium (MEM) with 5% fetal bovine serum (FBS) at pH values varying from 7.4 to 7.1 by addition of HCl. After time periods of 4 to 48 hours, cells were tested for cyclic AMP generation in response to PTH. PTH binding and PTH/PTHrP receptor mRNA levels were determined by radioligand binding assay and Northern analysis respectively.ResultsAfter 48 hours, decreases in pH from 7.4 to 7.1 resulted in a progressive increase in PTH-stimulated cyclic-AMP generation from 1978 ± 294 to 4968 ± 929 pmol/culture/5 min (P< 0.05). Basal cyclic AMP concentrations were unchanged. PTH binding increased 1.5- to twofold. Competitive inhibition binding revealed an increase in receptor number supported by up-regulation of PTH/PTHrP receptor mRNA up to twofold from control levels.ConclusionsThese findings demonstrate that metabolic acidosis stimulates the response to PTH in UMR 106-01 osteoblast-like cells by a mechanism that involves an increase in the levels of PTH/PTHrP receptor mRNA. Thus, the skeletal response to acidosis that includes an increase in bone resorption may result, at least in part, from an increase in PTH/PTHrP receptors leading to an enhanced effect of PTH on bone.
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DOI:
10.1152/ajprenal.1985.249.4.f566
发表时间:
1985
期刊:
The American journal of physiology
影响因子:
--
作者:
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通讯作者:
V. Paz
影响因子:
2.5
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DOI:
10.1016/0002-9343(82)90179-6
发表时间:
1982
期刊:
The American journal of medicine
影响因子:
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作者:
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通讯作者:
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DOI:
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发表时间:
1972
期刊:
The Lancet
影响因子:
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作者:
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通讯作者:
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DOI:
10.1210/jcem-42-5-875
发表时间:
1976
期刊:
The Journal of clinical endocrinology and metabolism
影响因子:
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作者:
C. Mautalen;R. Montoreano;C. Labarrere
通讯作者:
C. Labarrere