Candidate 56 and 58 kDa protein(s) responsible for mediating the renal defects in oncogenic hypophosphatemic osteomalacia.

Candidate 56 and 58 kDa protein(s) responsible for mediating the renal defects in oncogenic hypophosphatemic osteomalacia.
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候选 56 和 58 kDa 蛋白负责介导致癌性低磷血症性骨软化症中的肾缺陷。

DOI:
10.1016/8756-3282(95)00458-0
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发表时间:
1996
期刊:
影响因子:
4.1
通讯作者:
M. Hewison
M. Hewison
中科院分区:
医学2区
文献类型:
--
作者:
P. Rowe;A. Ong;F. Cockerill;J. Goulding;M. Hewison

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研究了源自致癌性低磷血症性骨软化症 (OHO) 肿瘤培养细胞的肿瘤条件培养基 (TCM) 对转化的人肾细胞的影响。在添加有中药的无血清培养基中培养的肾细胞中发生剂量依赖性细胞脱离和聚集,但在皮肤成纤维细胞对照或在存在血清的情况下培养的肾细胞中则没有。在血清 (0.5%) 存在下暴露于中药的肾细胞减少了 Na+ 依赖性磷酸盐共转运 (36%, p < 0.94) 并增加了 1α-羟化酶活性 (48%, p < 0.05)。相比之下,中药对Na+依赖性α-甲基葡萄糖转运没有显着影响。为了进一步研究这些影响,使用 OHO 患者在肿瘤切除前后的血清来产生针对肿瘤衍生产物的多克隆抗血清(分别为术前和术后抗血清)。术前添加抗血清可防止中药引起的 Na+ 依赖性磷酸盐共转运和维生素 D 代谢的变化,但术后添加抗血清则不能。此外,Western 分析显示在术前抗血清筛选的中药培养基中存在两种蛋白质 (∼56-58 kDa)。术后抗血清未检测到这些蛋白质,并且皮肤成纤维细胞对照培养基中不存在这些蛋白质。膦甲酸直接抑制 Na+ 依赖性磷酸盐共转运并不影响 1,25-二羟基维生素 D3 的合成。这些研究为影响 OHO 中磷酸盐处理和维生素 D 代谢的循环成分提供了支持。
The effects of tumor-conditioned media (TCM) derived from cultured cells from an oncogenic hypophosphatemic osteomalacia (OHO) tumor on transformed human kidney cells were investigated. Dose-dependent cell detachment and aggregation occurred in kidney cells cultured in serum-free medium supplemented with TCM, but not in skin fibroblast controls, or in kidney cells cultured in the presence of serum. Kidney cells exposed to TCM in the presence of serum (0.5%) hadreduced Na+-dependent phosphate cotransport (36%, p < 0.94) and increased 1α-hydroxylase activity (48%, p < 0.05). In contrast, TCM had no significant effect on Na+-dependent α-methyl-glucose transport. To investigate these effects further, serum from an OHO patient, before and after tumor resection, was used to raise polyclonal antiserum to tumor-derived products (preoperative and postoperative antiserum, respectively). Changes in Na+-dependent phosphate cotransport and vitamin D metabolism induced by TCM were prevented by the addition of preoperative but not postoperative antisera. Furthermore, Western analysis revealed the presence of two proteins (∼56–58 kDa) in TCM media screened with preoperative antisera. These proteins were not detected by postoperative antisera and were absent in skin fibroblast control media. Direct inhibition of Na+-dependent phosphate cotransport by phosphonoformic acid did not affect 1,25-dihydroxy vitamin D3synthesis. These studies provide support for a circulating component affecting phosphate handling and vitamin D metabolism in OHO.
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DOI: --
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发表时间: 1989
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DOI: 10.1210/jcem.79.5.7962329
发表时间: 1994
期刊: The Journal of clinical endocrinology and metabolism
影响因子: --
作者:
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