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1,25-二羟基维生素D3对低钙饮食喂养的甲状旁腺切除大鼠骨骼影响的超微结构评估

Ultrastructural evaluation of the effects of 1,25-dihydroxyvitamin D3 on bone of thyroparathyroidectomized rats fed a low-calcium diet.

作者信息

Weisbrode S E, Capen C C, Norman A W

出版信息

Am J Pathol. 1978 Aug;92(2):459-72.

PMID:677270
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2018283/
Abstract

Thyroparathyroidectomized rats fed a low-calcium-normal-phosphorus diet were administered 1 or 5 units of 1,25-dihydroxyvitamin D3-(1,25-[OH]2D3) or placebo daily for 7 days. 1,25-(OH)2D3 elevated serum and urine calcium and decreased serum phosphorus. Rats given 1 unit of 1,25-(OH)2D3 had increased numbers of osteoclasts in metaphyseal trabeculae, Ultrastructurally, osteoclasts, osteoblasts, and osteocytes in rats given 1 unit of 1,25-(OH)2D3, were similar to those in rats given placebo. In rats given 5 units of 1,25-(OH)2D3, osteoclasis was markedly increased. Osteoblasts were more numerous and interpreted to be active in matrix production and mineralization. Lamellated electron-dense bodies were observed adjacent to the plasma membranes of less active osteoblasts and were interpreted to be modified matrix. Most osteocytes in rats given 5 units of 1,25-(OH)2D3 were indistinguishable from osteocytes in rats given placebo. However,the pericellular space of some osteocytes in rats given 5 units of 1,25-(OH)2D3 contained electron-dense granular deposits that were interpreted to be calcium phosphate. It is concluded that 1,25-(OH)2D3 is able to significantly elevate serum calcium independent of dietary calcium, parathyroid hormone, and calcitonin primarily by increasing ostoeclasis with minimal dependence on osteocytic osteolysis.

摘要

给甲状旁腺切除的大鼠喂食低钙 - 正常磷饮食,每天给予1或5单位的1,25 - 二羟基维生素D3 -(1,25 - [OH]2D3)或安慰剂,持续7天。1,25 -(OH)2D3可提高血清和尿钙水平,并降低血清磷水平。给予1单位1,25 -(OH)2D3的大鼠干骺端小梁中的破骨细胞数量增加。超微结构上,给予1单位1,25 -(OH)2D3的大鼠中的破骨细胞、成骨细胞和骨细胞与给予安慰剂的大鼠中的相似。给予5单位1,25 -(OH)2D3的大鼠中,骨吸收明显增加。成骨细胞数量更多,被认为在基质产生和矿化方面活跃。在活性较低的成骨细胞质膜附近观察到层状电子致密体,被认为是修饰后的基质。给予5单位1,25 -(OH)2D3的大鼠中的大多数骨细胞与给予安慰剂的大鼠中的骨细胞无法区分。然而,给予5单位1,25 -(OH)2D3的大鼠中一些骨细胞的细胞周隙含有电子致密颗粒沉积物,被认为是磷酸钙。结论是,1,25 -(OH)2D3能够在不依赖膳食钙、甲状旁腺激素和降钙素的情况下显著提高血清钙水平,主要是通过增加骨吸收,对骨细胞性骨溶解的依赖性最小。

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