Role of alpha 1 adrenoceptors in the turnover of phosphatidylinositol and of alpha 2 adrenoceptors in the regulation of cyclic AMP accumulation in hamster adipocytes.
Role of alpha 1 adrenoceptors in the turnover of phosphatidylinositol and of alpha 2 adrenoceptors in the regulation of cyclic AMP accumulation in hamster adipocytes.
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α1 肾上腺素受体在磷脂酰肌醇周转中的作用和 α2 肾上腺素受体在仓鼠脂肪细胞中环 AMP 积累调节中的作用。
DOI:
10.1016/0024-3205(80)90105-8
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发表时间:
1980
期刊:
影响因子:
6.1
通讯作者:
Fain,JN
中科院分区:
文献类型:
--
作者:
García-Sínz,JA;Hoffman,BB;Li,SY;Lefkowitz,RJ;Fain,JN
The incorporation of radioactive phosphate into phosphatidylinositol was stimulated by epinephrine in hamster fat cells. This action was inhibited by alpha-adrenergic antagonists in the potency order: Prazosin⪢phentolamine>yohimbine. Methoxamine, but not clonidine, was able to mimic the effect of epinephrine. These data indicate that the phosphatidylinositol effect in fat cells is due to activation of alpha1adrenoceptors. On the other hand, the accumulation of cyclic AMP due to epinephrine was potentiated by alpha-adrenergic antagonists in the potency order phentolamine>yohimbine ⪢prazosin, in hamster fat cells. Clonidine significantly decreased the accumulation of cyclic AMP due to isoproterenol or ACTH in hamster fat cells, suggesting that the alpha-adrenergic modulation of cyclic AMP levels in hamster fat cells is mediated by alpha2adrenoceptors. Radioligand binding studies with plasma membranes from hamster adipocytes demonstrated the presence of both alpha1and alpha2adrenoceptors but about 90% of the binding sites were alpha2. These data support the hypothesis that alpha2effects of catecholamines are due to inhibition of adenylate cyclase while the increases in phosphatidylinositol turnover that seem to be involved in the mobilization of calcium are linked exclusively to alpha1adrenoceptor activation.
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影响因子:
3.5
作者:
R. Pecquery;L. Malagrida;Y. Giudicelli
通讯作者:
Y. Giudicelli
影响因子:
3.6
作者:
J. Lawrence;J. Larner,
通讯作者:
J. Larner,
DOI:
--
发表时间:
1977
期刊:
影响因子:
--
作者:
S. Berthelsen;W. Pettinger
通讯作者:
W. Pettinger
DOI:
--
发表时间:
1979
期刊:
Life Science
影响因子:
--
作者:
B. Hoffman;A. Léan;C. Wood;D. Schocken;R. Lefkowitz
通讯作者:
R. Lefkowitz
DOI:
--
发表时间:
1980
期刊:
Life Science
影响因子:
--
作者:
J. Fain;J. García
通讯作者:
J. García