胰岛素对Reh细胞胰岛素受体和胰岛素样生长因子Ⅰ型受体表达及细胞增殖的影响

本研究探讨胰岛素对Reh细胞胰岛素受体(IR)和胰岛素样生长因子Ⅰ型受体(IGF-ⅠR)表达的影响及对Reh细胞的促增殖作用。用CCK-8法检测Reh细胞的增殖;采用实时PCR法检测Reh细胞IR和IGF-ⅠRmRNA的表达。结果表明,胰岛素对Reh细胞具有浓度和时间依赖性的促增殖作用,当胰岛素浓度为10-9 mol/L时其促增殖作用最强,进一步提高浓度,胰岛素的促增殖作用不再增强。与对照组相比,胰岛素有明显的促增殖作用(P<0.05)。胰岛素10-9mol/L作用24、48及72 h,IR mRNA表达量与对照组相比的比值分别为2.2520±0.7431、1.9956±0.9692和3.9766±1.3189,IGF-ⅠR表达量与对照组相比的比值分别为1.0803±0.2238、1.6026±0.6158和3.1013±0.1008。胰岛素刺激后IR和IGF-ⅠR的mRNA相对表达量与对照组相比均明显增加,差别有统计学显著意义(P=0.022和P=0.00)。结论:胰岛素能促进Reh细胞的增殖,其机制可能与IR和IGF-ⅠR上调有关。IR和IGF-ⅠR的高表达与白血病细胞的生长有着密切关系。

Effects of insulin on expression of insulin receptor and insulin-like growth factor-1 receptor and proliferation in Reh cells

This study was aimed to explore the effects of insulin on expression of insulin receptor (IR) and insulin-like growth factor-I receptor (IGF-IR) in Reh cells and promoting effect on proliferation of Reh cells. The proliferation of Reh cells were evaluated by CCK-8 assay. The expression levels of IR and IGF-IR mRNA in Reh cells at different times were detected by real-time quantitative polymerase chain reaction. The results showed that insulin promoted the proliferation of Reh cells in dose- and time-dependent manners. Compared with the control group, insulin promoted the proliferation of Reh cells obviously (P < 0.05). When Reh cells were treated with insulin 10(-9) mol/L for 24, 48 and 72 h, the relative quantity of IR expression (2(-ΔCt1)/2(-ΔCt2)) was 2.2520 ± 0.7431, 1.9956 ± 0.9692 and 3.9766 ± 1.3189, respectively, the relative quantity of IGF-IR expression was 1.0803 ± 0.2238, 1.6026 ± 0.6158 and 3.1013 ± 0.1008, respectively, compared with the control group. The expression levels of IR and IGF-IR mRNA in Reh cells treated with insulin were obviously increased compared with the control group. It is concluded that insulin promotes the proliferation of Reh cells. The high expression levels of IR and IGF-IR may closely related with the growth of leukemia cells.