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• W1530488971 abstract "In isolated rat hepatocytes, ATP and ADP (10(-6) M) rapidly mobilize intracellular Ca2+ and increase the concentration of free cytosolic Ca2+ ([Ca2+]i) within 1-2 s. The increase in [Ca2+]i is maximal (2.5- to 3-fold) by about 10 s and is dose-dependent, with ATP and ADP being half-maximally effective at 8 X 10(-7) and 3 X 10(-7) M, respectively. At submaximal concentrations, the rise in [Ca2+]i is transient due to hydrolysis of the agonist. The increase in [Ca2+]i in response to ATP or ADP can be potentiated by low concentrations of glucagon (10(-9) M). In addition, the [Ca2+]i rise can be antagonized in a time- and dose-dependent manner by the tumor promoter 4 beta-phorbol 12 beta-myristate 13 alpha-acetate. Adenosine, at concentrations as high as 10(-4) M, does not alter [Ca2+]i. AMP is ineffective at 10(-5) M, but at 10(-4) M it increases [Ca2+]i approximately 1.5-fold after a 30-s lag and at a slow rate. Conversely, high concentrations (10(-4) M) of adenosine and AMP increases cell cAMP about 2- to 3-fold. ATP and ADP, at concentrations (10(-6) M) which near-maximally increase [Ca2+]i, do not affect hepatocyte cAMP. ATP and ADP increase the cellular level of myoinositol 1,4,5-trisphosphate (IP3), the putative second messenger for Ca2+ mobilization. The increase in IP3 is dose-dependent and precedes or is coincident with the [Ca2+]i rise. There is an approximate 20% increase in IP3 with concentrations of ATP or ADP which near-maximally induce other physiological responses. It is concluded that submicromolar concentrations of ATP and ADP mobilize intracellular Ca2+ and activate phosphorylase in hepatocytes due to generation of IP3. These effects may involve P2-purinergic receptors. In contrast adenosine and AMP interact with P1 (A2)-purinergic receptors to increase cAMP." @default.
• W1530488971 created "2016-06-24" @default.
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• W1530488971 date "1985-12-01" @default.
• W1530488971 modified "2023-09-30" @default.
• W1530488971 title "Characterization of responses of isolated rat hepatocytes to ATP and ADP." @default.
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• W1530488971 doi "https://doi.org/10.1016/s0021-9258(17)36327-5" @default.
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