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首页> 外文期刊>Cytokine >Thrombospondin 1, produced by endothelial cells under the action of erythropoietin, stimulates thymidine incorporation into erythroid cells and counteracts the inhibitory action of insulin-like growth factor binding protein 3.
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Thrombospondin 1, produced by endothelial cells under the action of erythropoietin, stimulates thymidine incorporation into erythroid cells and counteracts the inhibitory action of insulin-like growth factor binding protein 3.

机译:内皮细胞在促红细胞生成素的作用下产生的血小板反应蛋白1刺激胸腺嘧啶核苷掺入红系细胞并抵消胰岛素样生长因子结合蛋白3的抑制作用。

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摘要

The nature of erythropoietin (EPO)-dependent, erythroid cell regulatory factors secreted by endothelial cells is largely unknown. The production of thrombospondin 1 (TSP-1) and insulin-like growth factor binding protein 3 (IGFBP-3) is increased in cultures of human umbilical vein endothelial cells (HUVEC) incubated with erythropoietin (EPO). Simultaneous incubation of HUVEC with EPO and interleukin 3 (IL-3) resulted in a decreased production, suggesting that both TSP-1 and IGFBP-3 belong to the EPO- and IL-3-dependent erythroid regulatory factors previously described in cultures of bone marrow endothelial cells. TSP-1 and TSP-1 derived synthetic peptides based on the CD36 and CD47 binding sites of TSPs increased thymidine incorporation into bovine erythroid cells of fetal liver. IGBBP-3 inhibited thymidine incorporation in the same cells. Preincubation of erythroid cells with TSP-1 eliminated the inhibitory activity of IGFBP-3. We suggest that EPO-dependent, endothelial-derived TSP-1 may play a positive role in red cell production by acting directly on erythroid cells, stimulating DNA synthesis and preventing the inhibitory action of IGFBP-3.
机译:内皮细胞分泌的促红细胞生成素(EPO)依赖性红细胞调节因子的性质在很大程度上是未知的。在与促红细胞生成素(EPO)孵育的人脐静脉内皮细胞(HUVEC)培养物中,血小板反应蛋白1(TSP-1)和胰岛素样生长因子结合蛋白3(IGFBP-3)的产量增加。 HUVEC与EPO和白介素3(IL-3)同时孵育导致产量降低,这表明TSP-1和IGFBP-3均属于先前在骨培养物中描述的EPO和IL-3依赖性红系调节因子骨髓内皮细胞。基于TSP的CD36和CD47结合位点的TSP-1和TSP-1衍生的合成肽可增加胸腺嘧啶核苷掺入胎肝的牛红细胞中的能力。 IGBBP-3抑制了胸腺嘧啶核苷掺入同一细胞。用TSP-1对红细胞进行预孵育消除了IGFBP-3的抑制活性。我们建议依赖于EPO的内皮细胞TSP-1可能通过直接作用于类红细胞,刺激DNA合成并防止IGFBP-3的抑制作用而在红细胞生产中发挥积极作用。

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