Orexin A Affects INS-1 Rat Insulinoma Cell Proliferation via Orexin Receptor 1 and the AKT Signaling Pathway.

Orexin A Affects INS-1 Rat Insulinoma Cell Proliferation via Orexin Receptor 1 and the AKT Signaling Pathway.
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Orexin A 通过 Orexin 受体 1 和 AKT 信号通路影响 INS-1 大鼠胰岛素瘤细胞增殖

DOI:
10.1155/2013/854623
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发表时间:
2013
影响因子:
2.8
通讯作者:
Guo L
Guo L
中科院分区:
医学4区
文献类型:
--
作者:
Chen L;Zhao Y;Zheng D;Ju S;Shen Y;Guo L

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我们的目的是研究AKT/PKB(蛋白激酶B)信号通路通过食欲素受体1 (OX1R)的作用,以及食欲素A (OXA)对胰岛素分泌β细胞系(INS-1细胞)细胞增殖的影响。将大鼠INS-1细胞体外暴露于不同浓度的OXA中,并分别用OX1R拮抗剂(SB334867)、PI3K拮抗剂(wortmannin)、AKT拮抗剂(PF-04691502)或阴性对照处理。检测细胞增殖、活力和凋亡的INS-1量、胰岛素分泌、OX1R蛋白表达、caspase-3活性、AKT蛋白水平。我们报道,OXA(10−10至10−6 M)刺激INS-1细胞增殖和活力,降低caspase-3的促凋亡活性以保护凋亡细胞死亡,并增加胰岛素分泌。此外,OXA刺激AKT磷酸化(10−10 ~ 10−6 M)。然而,OX1R拮抗剂SB334867(10−6 M)、PI3K拮抗剂wortmannin(10−8 M)、AKT拮抗剂PF-04691502(10−6 M)或两者联合在一定程度上消除了OXA的作用。这些结果提示AKT激活介导的OXA-OX1R上调可能抑制INS-1细胞凋亡,促进细胞增殖。这一发现为OXA在大鼠胰岛素瘤细胞中的生物学作用提供了功能证据。
Our aim is to investigate the role of the AKT/PKB (protein kinase B) signaling pathway acting via orexin receptor 1 (OX1R) and the effects of orexin A (OXA) on cell proliferation in the insulin-secreting beta-cell line (INS-1 cells). Rat INS-1 cells were exposed to different concentrations of OXA in vitro and treated with OX1R antagonist (SB334867), PI3K antagonist (wortmannin), AKT antagonist (PF-04691502), or negative control. INS-1 amount of cell proliferation, viability and apoptosis, insulin secretion, OX1R protein expression, caspase-3 activity, and AKT protein levels were determined. We report that OXA (10−10 to 10−6 M) stimulates INS-1 cell proliferation and viability, reduces the proapoptotic activity of caspase-3 to protect against apoptotic cell death, and increases insulin secretion. Additionally, AKT phosphorylation was stimulated by OXA (10−10 to 10−6 M). However, the OX1R antagonist SB334867 (10−6 M), the PI3K antagonist wortmannin (10−8 M), the AKT antagonist PF-04691502 (10−6 M), or the combination of both abolished the effects of OXA to a certain extent. These results suggest that the upregulation of OXA-OX1R mediated by AKT activation may inhibit cell apoptosis and promote cell proliferation in INS-1 cells. This finding provides functional evidence of the biological actions of OXA in rat insulinoma cells.
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