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首页> 外文期刊>Cytokine >Effect of oestradiol on cytokine production in immortalized human marrow stromal cell lines.
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Effect of oestradiol on cytokine production in immortalized human marrow stromal cell lines.

机译:雌二醇对永生化的人骨髓基质细胞系中细胞因子产生的影响。

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摘要

Oestrogen deficiency enhances bone osteoclastogenesis and bone resorption. Evidence of cooperation between stromal cells and osteoclast precursors in mice suggests that oestradiol acts by regulating cytokine release from stromal cells. Bone marrow stroma contains multipotent progenitors that give rise to many mesenchymal lineages, including osteoblasts that may regulate osteoclast differentiation. We immortalized and characterized six human bone marrow stromal cell lines (presence of Stro1, secretion of alkaline phosphatase, osteocalcin, formation of lipid droplets, and presence of alpha and beta oestrogen receptors). The response of cytokines to oestradiol was then evaluated in vitro, as were the phorbol myristate acetate (PMA)-stimulated cytokine levels. Cells had the characteristics of undifferentiated stromal cells (Stro1+, RANK-L+), and expressed alpha-oestrogen receptors. The osteoblast phenotype (amounts of alkaline phosphatase and osteocalcin) was weak and there was a poor capacity to differentiate into adipocytes. These cell lines did not respond to oestradiol by producing interleukin 6 (IL-6), IL-1 or tumour necrosis factor alpha (TNF-alpha) either constitutively or after stimulation with PMA. Moreover, RANK-L and osteoprotegerin expressions were not regulated by oestradiol in vitro. Thus, modulation of these cytokines by stromal cells do not appear to be the mechanism by which oestradiol regulates bone resorption in humans.
机译:雌激素缺乏会增强骨破骨细胞生成和骨吸收。小鼠基质细胞和破骨细胞前体之间合作的证据表明,雌二醇通过调节基质细胞的细胞因子释放而起作用。骨髓基质含有能产生许多间充质谱系的多能祖细胞,包括可能调节破骨细胞分化的成骨细胞。我们永生化并表征了六个人类骨髓基质细胞系(Stro1的存在,碱性磷酸酶的分泌,骨钙素,脂质滴的形成以及α和β雌激素受体的存在)。然后在体外评估细胞因子对雌二醇的反应,以及佛波醇肉豆蔻酸酯乙酸盐(PMA)刺激的细胞因子水平。细胞具有未分化的基质细胞(Stro1 +,RANK-L +)的特征,并表达α-雌激素受体。成骨细胞表型(碱性磷酸酶和骨钙素的含量)较弱,分化为脂肪细胞的能力较弱。这些细胞系通过组成型或经PMA刺激后不产生白介素6(IL-6),IL-1或肿瘤坏死因子α(TNF-α)来响应雌二醇。此外,RANK-L和骨保护素的表达不受雌二醇的体外调节。因此,基质细胞对这些细胞因子的调节似乎不是雌二醇调节人骨吸收的机制。

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