基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失...基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失的磷酸酶及张力蛋白同源的基因(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)通路的一种物理机制.研究发现,Hes1通过与PTEN结合抑制PTEN表达,并调控AKT信号.表明了Hes1蛋白的合成,以及Hes1与PTEN相互作用调控AKT-MDM2-p53-PTEN通路信号,将会有效地控制细胞结果.Hes1作为AKT-MDM2-p53-PTEN信号通路中上游调节的重要因素,还可以在一定程度上通过影响p53蛋白功能,改变p53对肿瘤的抑制性.理论结果可用于预测Notch通路信号异常诱导的致癌性,并进一步揭示了Notch信号通路影响细胞AKT-MDM2-p53-PTEN通路的激活机制.展开更多
OBJECTIVE: To observe the inhibitory effect of the Chinese herbal compound Guizhu capsule(CGZC)on lung cancer and explore the possible mechanism underlying its actions by evaluating its effects on the expression of ph...OBJECTIVE: To observe the inhibitory effect of the Chinese herbal compound Guizhu capsule(CGZC)on lung cancer and explore the possible mechanism underlying its actions by evaluating its effects on the expression of phosphate and tension homology deleted on chromsome ten(PTEN) and murine double mimute 2(MDM2) in lung cancer model mice.METHODS: A mouse model of transplanted lung cancer was established by subcutaneous inoculation of cancer cells into the axillae of mice. Twenty-four hours later, the mice were weighed and randomly divided into the model control group, cisplatin group(DDP group), and high, moderate and low dosage CGZC groups, with ten mice in each group. The control mice received an equal volume of distilled water. DDP was intraperitoneally injected at 1 mg/kg in the DDP group, once a day for 3days. CGZC diluted with distilled water was admin-istered at 20 g/kg(10 times the clinical adult dosage) in the high-dose group, 10 g/kg(5 times the clinical adult dosage) in the moderate-dose group and 5 g/kg(2.5 times the clinical adult dosage) in the low-dose group once a day for 10 days. On the11 th day, the mice were weighed and killed. The tumor tissues were weighed and the tumor inhibition rate was calculated. PTEN and MDM2 protein expression were detected by immunohistochemical analysis of tumor tissues.RESULTS: The CGZC high-and moderate-dose groups showed a significant inhibitory effect on tumor growth(P < 0.05); there was no significant difference between the high dose group and the DDP group(P > 0.05). The CGZC high-dose group also showed enhanced expression of PTEN protein(P <0.01) and decreased expression of MDM2 protein(P < 0.01) in lung cancer cells of the mice. There was no significant difference between the high dose group and the DDP group.CONCLUSION: CGZC has a significant inhibitory effect on transplanted lung cancer in mice. The mechanism may involve reducing expression of PTEN and decreasing the expression of MDM2 in the lung cancer tissues of the mice.展开更多
文摘基于Hill动力学与Michaelis-Menten方程,建立理论模型研究发状分裂相关增强子1(Hairy and enhancer of split 1,Hes1)调控蛋白激酶B(Protein Kinase B,AKT)-鼠双微体2(Murine Double Minute2,MDM2)-抗癌基因p53(p53)-第10号染色体缺失的磷酸酶及张力蛋白同源的基因(Phosphatase and tensin homolog deleted on chromosome ten,PTEN)通路的一种物理机制.研究发现,Hes1通过与PTEN结合抑制PTEN表达,并调控AKT信号.表明了Hes1蛋白的合成,以及Hes1与PTEN相互作用调控AKT-MDM2-p53-PTEN通路信号,将会有效地控制细胞结果.Hes1作为AKT-MDM2-p53-PTEN信号通路中上游调节的重要因素,还可以在一定程度上通过影响p53蛋白功能,改变p53对肿瘤的抑制性.理论结果可用于预测Notch通路信号异常诱导的致癌性,并进一步揭示了Notch信号通路影响细胞AKT-MDM2-p53-PTEN通路的激活机制.
基金Supported by Science and Technology Project of Guangdong Province(No.73062)the Guangzhou Municipal Science and Technology Project(No.2007Z3-E5091)
文摘OBJECTIVE: To observe the inhibitory effect of the Chinese herbal compound Guizhu capsule(CGZC)on lung cancer and explore the possible mechanism underlying its actions by evaluating its effects on the expression of phosphate and tension homology deleted on chromsome ten(PTEN) and murine double mimute 2(MDM2) in lung cancer model mice.METHODS: A mouse model of transplanted lung cancer was established by subcutaneous inoculation of cancer cells into the axillae of mice. Twenty-four hours later, the mice were weighed and randomly divided into the model control group, cisplatin group(DDP group), and high, moderate and low dosage CGZC groups, with ten mice in each group. The control mice received an equal volume of distilled water. DDP was intraperitoneally injected at 1 mg/kg in the DDP group, once a day for 3days. CGZC diluted with distilled water was admin-istered at 20 g/kg(10 times the clinical adult dosage) in the high-dose group, 10 g/kg(5 times the clinical adult dosage) in the moderate-dose group and 5 g/kg(2.5 times the clinical adult dosage) in the low-dose group once a day for 10 days. On the11 th day, the mice were weighed and killed. The tumor tissues were weighed and the tumor inhibition rate was calculated. PTEN and MDM2 protein expression were detected by immunohistochemical analysis of tumor tissues.RESULTS: The CGZC high-and moderate-dose groups showed a significant inhibitory effect on tumor growth(P < 0.05); there was no significant difference between the high dose group and the DDP group(P > 0.05). The CGZC high-dose group also showed enhanced expression of PTEN protein(P <0.01) and decreased expression of MDM2 protein(P < 0.01) in lung cancer cells of the mice. There was no significant difference between the high dose group and the DDP group.CONCLUSION: CGZC has a significant inhibitory effect on transplanted lung cancer in mice. The mechanism may involve reducing expression of PTEN and decreasing the expression of MDM2 in the lung cancer tissues of the mice.