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• W2034129715 abstract "1. We tested the hypothesis that the negative functional effects of cyclic GMP (cGMP) oppose the positive effects of cyclic AMP (cAMP) in cardiac myocytes through interaction at the level of their respective protein kinases. 2. Cell shortening was studied using a video-edge detector. The O2 consumption of a suspension of rabbit ventricular myocytes was measured using O2 electrodes. Protein phosphorylation was measured autoradiographically following SDS-PAGE. Data were collected with: (1) 8-bromo-cGMP (8-Br-cGMP) 10(-7) or 10(-5) M; (2) 8-bromo-cAMP (8-Br-cAMP) 10(-7) or 10(-5) M; (3) 8-Br-cAMP 10(-5) M followed by 8-Br-cGMP 10(-7) or 10(-5) M; (4) 8-Br-cGMP 10(-5) M followed by 8-Br-cAMP 10(-7) or 10(-5) M; (5) 8-Br-cGMP 10(-7) or 10(-5) M followed by KT 5720 (cAMP-dependent protein kinase inhibitor) or KT 5823 (cGMP-dependent protein kinase inhibitor) 10(-6) M; and (6) 8-Br-cAMP 10(-7) or 10(-5) M followed by KT 5720 or KT 5823 10(-6) M. 3. 8-Br-cGMP 10(-5) M decreased percent shortening (Pcs) from 6.3+/-0.6 to 3.6+/-0.4% and rate of shortening (Rs) from 66.7+/-4.4 to 41.8+/-4.2 microm s(-1). 8-Br-cAMP 10(-5) M increased Pcs (from 3.7+/-0.2 to 4.8+/-0.2) and Rs (from 50.0+/-3.0 to 60.0+/-3.1). With 8-Br-cAMP 10(-5) M, 8-Br-cGMP 10(-5) M decreased Pcs and Rs less. The positive functional effects of 8-Br-cAMP 10(-7) or 10(-5) M were also diminished with 8-Br-cGMP 10(-5) M. Following 8-Br-cGMP 10(-7) or 10(-5) M, KT 5720 10(-6) M further decreased Pcs to 2.5+/-0.3 and Rs to 30.0+/-4.1. KT 5823 10(-6) M returned Pcs to 4.7+/-0.4 and Rs to 61.3+/-5.3. Following 8-Br-cAMP 10(-7) or 10(-5) M, KT 5720 decreased the elevated Pcs and Rs significantly and KT 5823 10(-6) M further increased these parameters. 4. cGMP and cAMP phosphorylated the same five protein bands. With KT 5720 or KT 5823, all of the bands were lighter at the same concentration of 8-Br-cAMP and 8-Br-cGMP. 5. We conclude that, in rabbit ventricular myocytes, the opposing functional effects of cGMP and cAMP are related to the interaction at the level of their respective protein kinases." @default.
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• W2034129715 date "2000-04-01" @default.
• W2034129715 modified "2023-09-26" @default.
• W2034129715 title "Opposing functional effects of cyclic GMP and cyclic AMP may act through protein phosphorylation in rabbit cardiac myocytes" @default.
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• W2034129715 doi "https://doi.org/10.1046/j.1365-2680.2000.00177.x" @default.
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