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
中科院分区:
文献类型:
--
作者:
S. Incerpi;P. Baldini;V. Bellucci;A. Zannetti;P. Luly
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 NaH 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 NaH 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.
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DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Rosić,NK;Standaert,ML;Pollet,RJ
通讯作者:
Pollet,RJ
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
通讯作者:
Scharschmidt,BF
影响因子:
3.5
作者:
Acevedo-Duncan,M;Cooper,DR;Standaert,ML;Farese,RV
通讯作者:
Farese,RV
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Arias,IM;Forgac,M
通讯作者:
Forgac,M
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