A disintegrin and metalloprotease 17(ADAM17)is a membrane-bound enzyme that cleaves cell-surface proteins.Here,we discovered that neuronal ADAM17-mediated signaling supports the reduction of inhibitory presynaptic inp...A disintegrin and metalloprotease 17(ADAM17)is a membrane-bound enzyme that cleaves cell-surface proteins.Here,we discovered that neuronal ADAM17-mediated signaling supports the reduction of inhibitory presynaptic inputs to the pre-sympathetic glutamatergic neural hub,located in the paraventricular nucleus of the hypothalamus(PVN),upon stimulation by angiotensin II(Ang-II).For Ang-II-induced disinhibition,targeting microglial migration had an effect similar to ADAM17 knockout in glutamatergic neurons.Ang-II promoted neuron-mediated chemotaxis of microglia via neuronal CX3CL1 and ADAM17.Inhibiting microglial chemotaxis by targeting CX3CR1 abolished the Ang-II-induced microglial displacement of GABAergic presynaptic terminals and significantly blunted Ang-II’s pressor response.Using conditional and targeted knockout models of ADAM17,an increase in the contact between pre-sympathetic neurons and reactive microglia in the PVN was demonstrated to be neuronal ADAM17-dependent during the developmental stage of salt-sensitive hypertension.Collectively,this study provides evidence that neuronal ADAM17-mediated microglial chemotaxis facilitates the disinhibition of pre-sympathetic glutamatergic tone upon hormonal stimulation.展开更多
Summary: Glycoprotein (GP) Ibα ectodomain shedding has important implications for thrombosis and hemostasis. A disintegrin and metalloproteinase 17 (ADAM17) was identified to play an essen- tial role in agonist ...Summary: Glycoprotein (GP) Ibα ectodomain shedding has important implications for thrombosis and hemostasis. A disintegrin and metalloproteinase 17 (ADAM17) was identified to play an essen- tial role in agonist induced GPIbαshedding. The relationship of GPIbu shedding and ADAM 17 in the acute stage of atherosclerotic ischemic stroke (AIS) patients has not been thoroughly studied. A total of 306 patients and 230 controls matched for age, sex, race, history of hypertension and diabetes mel- litus were enrolled in the study. GPIbα, ADAM17, glycocalicin were detected by flow cytometry, Western blotting, and enzyme-linked immunosorbent assay (ELISA) respectively. Compared with the control group, the expression of GPIbα in patients with acute ischemic stroke was significantly lower (P=0.000, P〈0.01). Plasma glycocalicin and ADAM17 in AIS group were higher than those in con- trol group (P=0.699, P=0.000). Pearson's analysis showed glycocalicin bore no correlation with GPIbu in AIS patients (r=0.095, P〉0.05). GPIbα and National Institute of Health Stroke Scale (NIHSS) had negative correlation (r=-0.514, P〈0.01). Our findings indicate that ADAM 17 may be a risk factor for ischemic stroke in Chinese and the expression of GPIbα can serve as a measure for stroke severity.展开更多
去整合素-金属蛋白酶17(adisintegrin and metalloproteinase17,ADAM17)是近年来发现的金属蛋白酶解聚素(adisintegrinand metalloproteinase,ADAMs)家族成员之一,参与肿瘤发生发展的重要过程。去整合素-金属蛋白酶17(ADAM17)又称为肿...去整合素-金属蛋白酶17(adisintegrin and metalloproteinase17,ADAM17)是近年来发现的金属蛋白酶解聚素(adisintegrinand metalloproteinase,ADAMs)家族成员之一,参与肿瘤发生发展的重要过程。去整合素-金属蛋白酶17(ADAM17)又称为肿瘤坏死因子转换酶(TACE),因此除了具有解聚素和金属蛋白酶的活性,还可以将没有活性的肿瘤坏死因子(TNF-α)从细胞膜上切割下来,并与其受体相结合,从而激活TNF-α下游的EGFR信号传导,此外还可以激活多条信号传导途径如Notch传导通路等,进而影响肿瘤细胞的粘附、凋亡、转移、增殖等生物学行为。纵观ADAM17的研究,在多种恶性肿瘤中呈高表达状态,且这种高表达状态与肿瘤侵润程度及转移情况相关。随着人们对ADAM17基础科学的研究不断深入,ADAM17的临床应用前景也正被不断开发,鉴于其在多种恶性肿瘤组织中高表达的情况,可将其作为许多肿瘤的诊断标志物、及判断其转移和预后情况。靶向药物的研究给恶性肿瘤患者带来了新的福音,利用EGFR为研究扳机点成功研制出许多靶向药物,在EGFR的配体释放环节,ADAM17尤为重要。本文总结了ADAM17在恶性肿瘤发展中的作用及其机制,对其在癌症治疗的应用前景进行展望。展开更多
Objective:To investigate the effects of siRNA of ADAM17 gene and genistein on apoptosis and the inhibition of proliferation in HepG2 cells in an attempt to seek an effective therapy for hepatocellular carinoma. Meth...Objective:To investigate the effects of siRNA of ADAM17 gene and genistein on apoptosis and the inhibition of proliferation in HepG2 cells in an attempt to seek an effective therapy for hepatocellular carinoma. Methods:Cells were divided into control groups and experimental groups and siRNA was used to silence the ADAM17 gene, alone and in combination with genistein. Cells were harvested at several time periods and assessed for proliferation and apoptosis. Proliferation was assayed by MTT at 24, 48, 72 and 96 hours following treatment and apoptosis was assessed by flow cytometric analysis at 48 hours. Results:In siRNA groups, proliferation of cells was significantly inhibited compared to the control groups at 24, 48 and 72 hours(P 〈 0.05), and apoptosis was significantly increased at 48 hours(P〈 0.01); In genistein groups, proliferation was inhibited at 24, 48, 72 and 96 hours, and the apoptosis ratio was significantly increased at 48 hours(P〈 0.01); while in the groups that received the combination of siRNA transfection and genistein treatment, there was a further significant decrease of proliferation and increase in apoptosis compared with either treatment alone. Conclusion:The ADAM17 gene could be an effective target, and genistein could be a useful agent, in the treatment of hepatocellular carcinoma, siRNA of ADAM17 gene and genistein both inhibited HepG2 cells proliferation and promoted apoptosis, and further, the combination of these treatments had a greater effect than either treatment alone.展开更多
基金supported by the National Natural Science Foundation of China(82100454,32271016,82101586,and 81872563)the National Heart,Lung,Blood,and Sleep Institute(HL163588).
摘要A disintegrin and metalloprotease 17(ADAM17)is a membrane-bound enzyme that cleaves cell-surface proteins.Here,we discovered that neuronal ADAM17-mediated signaling supports the reduction of inhibitory presynaptic inputs to the pre-sympathetic glutamatergic neural hub,located in the paraventricular nucleus of the hypothalamus(PVN),upon stimulation by angiotensin II(Ang-II).For Ang-II-induced disinhibition,targeting microglial migration had an effect similar to ADAM17 knockout in glutamatergic neurons.Ang-II promoted neuron-mediated chemotaxis of microglia via neuronal CX3CL1 and ADAM17.Inhibiting microglial chemotaxis by targeting CX3CR1 abolished the Ang-II-induced microglial displacement of GABAergic presynaptic terminals and significantly blunted Ang-II’s pressor response.Using conditional and targeted knockout models of ADAM17,an increase in the contact between pre-sympathetic neurons and reactive microglia in the PVN was demonstrated to be neuronal ADAM17-dependent during the developmental stage of salt-sensitive hypertension.Collectively,this study provides evidence that neuronal ADAM17-mediated microglial chemotaxis facilitates the disinhibition of pre-sympathetic glutamatergic tone upon hormonal stimulation.
基金supported by the National Natural Science Foundation of China (No. 81072945)
摘要Summary: Glycoprotein (GP) Ibα ectodomain shedding has important implications for thrombosis and hemostasis. A disintegrin and metalloproteinase 17 (ADAM17) was identified to play an essen- tial role in agonist induced GPIbαshedding. The relationship of GPIbu shedding and ADAM 17 in the acute stage of atherosclerotic ischemic stroke (AIS) patients has not been thoroughly studied. A total of 306 patients and 230 controls matched for age, sex, race, history of hypertension and diabetes mel- litus were enrolled in the study. GPIbα, ADAM17, glycocalicin were detected by flow cytometry, Western blotting, and enzyme-linked immunosorbent assay (ELISA) respectively. Compared with the control group, the expression of GPIbα in patients with acute ischemic stroke was significantly lower (P=0.000, P〈0.01). Plasma glycocalicin and ADAM17 in AIS group were higher than those in con- trol group (P=0.699, P=0.000). Pearson's analysis showed glycocalicin bore no correlation with GPIbu in AIS patients (r=0.095, P〉0.05). GPIbα and National Institute of Health Stroke Scale (NIHSS) had negative correlation (r=-0.514, P〈0.01). Our findings indicate that ADAM 17 may be a risk factor for ischemic stroke in Chinese and the expression of GPIbα can serve as a measure for stroke severity.
摘要去整合素-金属蛋白酶17(adisintegrin and metalloproteinase17,ADAM17)是近年来发现的金属蛋白酶解聚素(adisintegrinand metalloproteinase,ADAMs)家族成员之一,参与肿瘤发生发展的重要过程。去整合素-金属蛋白酶17(ADAM17)又称为肿瘤坏死因子转换酶(TACE),因此除了具有解聚素和金属蛋白酶的活性,还可以将没有活性的肿瘤坏死因子(TNF-α)从细胞膜上切割下来,并与其受体相结合,从而激活TNF-α下游的EGFR信号传导,此外还可以激活多条信号传导途径如Notch传导通路等,进而影响肿瘤细胞的粘附、凋亡、转移、增殖等生物学行为。纵观ADAM17的研究,在多种恶性肿瘤中呈高表达状态,且这种高表达状态与肿瘤侵润程度及转移情况相关。随着人们对ADAM17基础科学的研究不断深入,ADAM17的临床应用前景也正被不断开发,鉴于其在多种恶性肿瘤组织中高表达的情况,可将其作为许多肿瘤的诊断标志物、及判断其转移和预后情况。靶向药物的研究给恶性肿瘤患者带来了新的福音,利用EGFR为研究扳机点成功研制出许多靶向药物,在EGFR的配体释放环节,ADAM17尤为重要。本文总结了ADAM17在恶性肿瘤发展中的作用及其机制,对其在癌症治疗的应用前景进行展望。
摘要Objective:To investigate the effects of siRNA of ADAM17 gene and genistein on apoptosis and the inhibition of proliferation in HepG2 cells in an attempt to seek an effective therapy for hepatocellular carinoma. Methods:Cells were divided into control groups and experimental groups and siRNA was used to silence the ADAM17 gene, alone and in combination with genistein. Cells were harvested at several time periods and assessed for proliferation and apoptosis. Proliferation was assayed by MTT at 24, 48, 72 and 96 hours following treatment and apoptosis was assessed by flow cytometric analysis at 48 hours. Results:In siRNA groups, proliferation of cells was significantly inhibited compared to the control groups at 24, 48 and 72 hours(P 〈 0.05), and apoptosis was significantly increased at 48 hours(P〈 0.01); In genistein groups, proliferation was inhibited at 24, 48, 72 and 96 hours, and the apoptosis ratio was significantly increased at 48 hours(P〈 0.01); while in the groups that received the combination of siRNA transfection and genistein treatment, there was a further significant decrease of proliferation and increase in apoptosis compared with either treatment alone. Conclusion:The ADAM17 gene could be an effective target, and genistein could be a useful agent, in the treatment of hepatocellular carcinoma, siRNA of ADAM17 gene and genistein both inhibited HepG2 cells proliferation and promoted apoptosis, and further, the combination of these treatments had a greater effect than either treatment alone.