Modulation of the Na–;H antiport by insulin: Interplay between protein kinase C, tyrosine kinase, and protein phosphatases

Modulation of the Na–;H antiport by insulin: Interplay between protein kinase C, tyrosine kinase, and protein phosphatases
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胰岛素对 Na–;H 反向转运的调节:蛋白激酶 C、酪氨酸激酶和蛋白磷酸酶之间的相互作用

DOI:
10.1002/jcp.1041590203
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发表时间:
1994
影响因子:
5.6
通讯作者:
P. Luly
P. Luly
中科院分区:
生物学2区
文献类型:
--
作者:
S. Incerpi;P. Baldini;V. Bellucci;A. Zannetti;P. Luly

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使用荧光、pH敏感的细胞内探针2′,7 ′二(羧乙基)-5(6)-羧基荧光素(BCECF)研究了大鼠肝细胞中Na‐H反向转运的胰岛素调节。我们的数据表明,胰岛素刺激Na +-OH反向转运。胰岛素效应的剂量反应显示了其他胰岛素反应的典型行为:生理范围内的最大值(1 nM),以及较高和较低激素浓度下的较小效应。在高激素浓度下,激活时程非常快,而在生理浓度下,激活时程缓慢,但达到较高值(1 nM和1 μM胰岛素分别为0.26± 0.05和0.18 ± 0.022 pH单位)。使用佛波醇,12-肉豆蔻酸酯,13-乙酸酯(PMA),一种有效的蛋白激酶C激活剂及其抑制剂星形孢菌素,以及酪氨酸激酶抑制剂erbstatin类似物,表明蛋白激酶C和酪氨酸激酶都可能参与胰岛素激活Na + H反向转运的机制。我们认为,激活的反向运输涉及两个途径依赖于激素浓度。特别是,蛋白激酶C将介导高激素浓度的作用,作为生长因子,因为星形孢菌素完全抑制胰岛素1 μM,但仅部分抑制1 nM的作用,酪氨酸激酶将介导胰岛素1 nM的作用,但仅部分抑制1 μM的作用。冈田酸1 μM是一种有效的蛋白磷酸酶抑制剂,模拟了激素对反向转运的作用,并消除了激素浓度引起的不同时程,表明激酶和磷酸酶在信号转导中的作用。阿米洛利类似物5-(N-乙基-N-异丙基)阿米洛利(EIPA)消除了所有激活剂的作用,证实了这些作用的特异性。© 1994 wiley利斯公司
The insulin modulation of Na‐H antiport in rat hepatocytes was studied using the fluorescent, pH‐sensitive intracellular probe, 2′,7′ bis (carboxyethyl)‐5(6)‐carboxyfluorescein (BCECF). Our data show that insulin stimulates the NaH antiport. The dose‐response of insulin effect shows a behavior typical of other insulin responses: a maximum in the physiological range (1 nM) and smaller effects at higher and lower hormone concentrations. The time‐course of activation is very fast at high hormone concentrations and slow, but reaching a higher value, for the physiological concentrations (0.26± 0.05 and 0.18 ± 0.022 pH units for 1 nM and 1 μM insulin respectively). The use of phorbol, 12‐myristate, 13‐acetate (PMA), a potent activator of protein kinase C and its inhibitor staurosporine, and the inhibitor of tyrosine kinase erbstatin analog, suggests that both protein kinase C and tyrosine kinase could be involved in the mechanism leading to NaH antiport activation by insulin. We suggest that the activation of the antiport involves the two pathways depending on the hormone concentration. In particular, protein kinase C would mediate the effects of high hormone concentrations, acting as a growth factor, since staurosporine fully inhibited insulin 1 μM, but only partially 1 nM effects, and tyrosine kinase would mediate the effect of insulin 1 nM and only partially 1 μM. Okadaic acid 1 μM, a potent inhibitor of protein phosphatases, mimicked the hormone effects on the antiport and abolished the different time‐course due to hormone concentration, suggesting a role of kinases and phosphatases in the signal transduction. The effect of all activators was abolished by amiloride analog, 5‐(N‐ethyl‐N‐isopropyl) amiloride (EIPA), confirming the specificity of these effects. © 1994 wiley‐Liss, Inc.
胰岛素刺激肌肉中 (Na ,K )-ATP 酶转运活性的机制。
DOI: --
发表时间: 1985
期刊: The Journal of biological chemistry
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作者:
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通讯作者: Pollet,RJ
大鼠肝细胞质膜 H( )-HCO3- 转运:Na( )-耦合 HCO3- 转运的主要作用。
DOI: 10.1152/ajpgi.1991.261.5.g803
发表时间: 1991
期刊: The American journal of physiology
影响因子: --
作者:
Fitz,JG;Lidofsky,SD;Xie,MH;Cochran,M;Scharschmidt,BF
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免疫学证据表明胰岛素激活 BC3H-1 肌细胞中的蛋白激酶 C。
DOI: 10.1016/0014-5793(89)81186-x
发表时间: 1989
期刊: FEBS letters
影响因子: 3.5
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大鼠肝细胞质膜的正弦结构域含有阿米洛利敏感的 Na /H 反向转运。
DOI: --
发表时间: 1984
期刊: The Journal of biological chemistry
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胰岛素和佛波酯通过共同途径刺激传导性钠转运。
DOI: 10.1073/pnas.85.3.963
发表时间: 1988
影响因子: 11.1
作者:
Civan,MM;Peterson-Yantorno,K;O'Brien,TG
通讯作者: O'Brien,TG