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首页> 外文期刊>Journal of Cellular Physiology >Altered intracellular calcium fluxes in pancreatic cancer induced diabetes mellitus: Relevance of the S100A8 N-terminal peptide (NT-S100A8).
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Altered intracellular calcium fluxes in pancreatic cancer induced diabetes mellitus: Relevance of the S100A8 N-terminal peptide (NT-S100A8).

机译:改变细胞内钙在胰腺通量癌症诱导糖尿病:相关性S100A8 n端肽(NT-S100A8)。

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After isolating NT-S100A8 from pancreatic cancer (PC) tissue of diabetic patients, we verified whether this peptide alters PC cell growth and invasion and/or insulin release and [Ca(2+)](i) oscillations of insulin secreting cells and/or insulin signaling. BxPC3, Capan1, MiaPaCa2, Panc1 (PC cell lines) cell growth, and invasion were assessed in the absence or presence of 50, 200, and 500 nM NT-S100A8. In NT-S100A8 stimulated beta-TC6 (insulinoma cell line) culture medium, insulin and [Ca(2+)] were measured at 2, 3, 5, 10, 15, 30, and 60 min, and [Ca(2+)](i) oscillations were monitored (epifluorescence) for 3 min. Five hundred nanomolars NT-S100A8 stimulated BxPC3 cell growth only and dose dependently reduced MiaPaCa2 and Panc1 invasion. Five hundred nanomolars NT-S100A8 induced a rapid insulin release and enhanced beta-TC6 [Ca(2+)](i) oscillations after both one (F = 6.05, P < 0.01) and 2 min (F = 7.42, P < 0.01). In the presence of NT-S100A8, [Ca(2+)] in beta-TC6 culture medium significantly decreased with respect to control cells (F = 6.3, P < 0.01). NT-S100A8 did not counteract insulin induced phosphorylation of the insulin receptor, Akt and IkappaB-alpha, but it independently activated Akt and NF-kappaB signaling in PC cells. In conclusion, NT-S100A8 exerts a mild effect on PC cell growth, while it reduces PC cell invasion, possibly by Akt and NF-kappaB signaling, NT-S100A8 enhances [Ca(2+)](i) oscillations and insulin release, probably by inducing Ca(2+) influx from the extracellular space, but it does not interfere with insulin signaling.
机译:隔离NT-S100A8后胰腺癌(PC)组织的糖尿病患者,我们证实这种肽是否改变细胞生长和电脑入侵和/或胰岛素的释放和(Ca(2 +))(我)和/或振荡的胰岛素分泌细胞胰岛素信号。(PC细胞系)细胞生长和入侵评估在没有或50,200,和500 nM NT-S100A8。beta-TC6胰岛瘤细胞系培养基,胰岛素和(Ca(2 +))测定2,3,5,10、15、30和60分钟,和(Ca(2 +))(我)振动监测(这项工作)3分钟。五百摩尔NT-S100A8只BxPC3刺激细胞生长和剂量非独立减少MiaPaCa2和Panc1入侵。五百年摩尔NT-S100A8诱导迅速胰岛素的释放和增强beta-TC6 (Ca(2 +))(我)振荡后一个(F = 6.05, P < 0.01)和2分钟(F = 7.42, P < 0.01)。NT-S100A8, (Ca (2 +)) beta-TC6培养基大大减少对控制细胞(F = 6.3, P < 0.01)。抵消胰岛素诱导的磷酸化胰岛素受体,Akt IkappaB-alpha,但它一种蛋白激酶和NF-kappaB独立激活在PC细胞信号。产生轻微影响PC细胞生长,而它降低PC细胞入侵,可能由一种蛋白激酶和NF-kappaB信号,NT-S100A8提高(Ca (2 +)) (i)振荡和胰岛素释放,可能通过诱导Ca(2 +)的涌入细胞外空间,但它不会干涉与胰岛素信号。

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