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:
Kidney international.
影响因子:
--
通讯作者:
Gonzalez,EstherA
Gonzalez,EstherA
中科院分区:
--
文献类型:
--
作者:
Disthabanchong,Sinee;Martin,KevinJ;McConkey,CharlesL;Gonzalez,EstherA

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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。背景代谢性酸中毒通过多种机制导致骨骼脱矿。其中之一涉及骨的无机相,氢离子通过骨碳酸盐缓冲。此外,骨的细胞成分还参与一些骨骼基因的诱导和抑制。先前的研究表明,酸中毒可能会改变骨转换的主要调节剂甲状旁腺激素(PTH)的作用。本研究旨在直接在体外测试酸中毒是否会改变 UMR 106-01 成骨细胞样细胞中 PTH 的作用。方法通过添加 HCl,在含有 5% 胎牛血清 (FBS) 的改良伊格尔培养基 (MEM) 中,在 pH 值从 7.4 至 7.1 变化的条件下,对 UMR 106-01 细胞的汇合培养物进行研究。 4 至 48 小时后,测试细胞响应 PTH 产生的环 AMP。分别通过放射性配体结合测定和Northern分析测定PTH结合和PTH/PTHrP受体mRNA水平。结果48小时后,pH从7.4降低到7.1导致PTH刺激的环AMP生成从1978±294逐渐增加到4968±929pmol/培养物/5分钟(P<0.05)。基础环 AMP 浓度没有变化。 PTH 结合增加 1.5 至两倍。竞争性抑制结合揭示了 PTH/PTHrP 受体 mRNA 上调所支持的受体数量增加,较对照水平高达两倍。结论这些发现表明,代谢性酸中毒通过涉及 PTH/PTHrP 受体 mRNA 水平增加的机制刺激 UMR 106-01 成骨细胞样细胞对 PTH 的反应。因此,骨骼对酸中毒的反应(包括骨吸收的增加)可能至少部分是由于 PTH/PTHrP 受体的增加导致 PTH 对骨的作用增强。
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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