首页> 外文期刊>American Journal of Physiology >Epidermal growth factor inhibits glycylsarcosine transport and hPepT1 expression in a human intestinal cell line.
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Epidermal growth factor inhibits glycylsarcosine transport and hPepT1 expression in a human intestinal cell line.

机译:表皮生长因子抑制人肠道细胞系中的糖基肌氨酸转运和hPepT1表达。

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The human intestinal cell line Caco-2 was used as a model system to study the effects of epidermal growth factor (EGF) on peptide transport. EGF decreased apical-to-basolateral fluxes of [(14)C]glycylsarcosine ([(14)C]Gly-Sar) up to 50.2 +/- 3.6% (n = 6) of control values. Kinetic analysis of the fluxes showed that maximal flux (V(max)) of transepithelial transport decreased from 3.00 +/- 0.17 nmol x cm(-2) x min(-1) in control cells to 0.50 +/- 0.07 nmol x cm(-2) x min(-1) in cells treated with 5 ng/ml EGF (n = 6, P < 0.01). The apparent Michaelis-Menten constant (K(m)) was 2.71 +/- 0.31 mM (n = 6) in control cells and 1.89 +/- 0.28 mM (n = 6, not significantly different from control) in EGF-treated cells. Similarly, apical uptake of [(14)C]Gly-Sar decreased in cells treated with EGF, with an ED(50) value of 0.36 +/- 0.06 ng/ml (n = 6) EGF and a maximal inhibition of 80 +/- 0.02% (n = 6). V(max) decreased from 2.61 +/- 0.4 to 1.06 +/- 0.1 nmol x cm(-2) x min(-1) (n = 3, P < 0.05), whereas K(m) remained constant. Basolateral Gly-Sar uptake showed no changes in V(max) or K(m) after EGF treatment (n = 3). RT-PCR showed a decrease in hPepT1 mRNA (using glucose-6-phosphate dehydrogenase mRNA as control) in cells treated with EGF. Western blotting indicated a decrease in hPepT1 protein in cell lysates. We conclude that EGF treatment decreases Gly-Sar transport in Caco-2 cells by decreasing the number of peptide transporter molecules in the apical membrane.
机译:以人肠道细胞系Caco-2为模型系统,研究表皮生长因子(EGF)对肽转运的影响。 EGF降低[(14)C]糖基肌氨酸([(14)C] Gly-Sar)的根尖至基底外侧通量,直至对照值的50.2 +/- 3.6%(n = 6)。通量的动力学分析表明,跨上皮运输的最大通量(V(max))从对照细胞中的3.00 +/- 0.17 nmol x cm(-2)x min(-1)降低至0.50 +/- 0.07 nmol x cm (-2)x min(-1)在用5 ng / ml EGF处理的细胞中(n = 6,P <0.01)。在对照细胞中,表观Michaelis-Menten常数(K(m))为2.71 +/- 0.31 mM(n = 6),在经EGF处理的细胞中为1.89 +/- 0.28 mM(n = 6,与对照无显着差异)。 。同样,在用EGF处理的细胞中,[(14)C] Gly-Sar的根吸收减少,ED(50)值为0.36 +/- 0.06 ng / ml(n = 6)EGF,最大抑制量为80 + +/- 0.02%(n = 6)。 V(max)从2.61 +/- 0.4降至1.06 +/- 0.1 nmol x cm(-2)x min(-1)(n = 3,P <0.05),而K(m)保持不变。 EGF治疗后基底外侧Gly-Sar摄取显示V(max)或K(m)没有变化(n = 3)。 RT-PCR显示在用EGF处理的细胞中,hPepT1 mRNA降低(使用葡萄糖-6-磷酸脱氢酶mRNA作为对照)。蛋白质印迹表明细胞裂解物中hPepT1蛋白减少。我们得出的结论是,EGF治疗通过减少顶膜中的肽转运蛋白分子的数量来减少Caco-2细胞中的Gly-Sar转运。

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