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• W2170755025 abstract "Baseline function and signal transduction are depressed in hearts with hypertrophic failure. We tested the hypothesis that the effects of cGMP and its interaction with cAMP would be reduced in cardiac myocytes from hypertrophic failing hearts. Ventricular myocytes were isolated from control dogs, dogs with aortic valve stenosis hypertrophy, and dogs with pacing hypertrophic failure. Myocyte function was measured using a video edge detector. Cell contraction data were obtained at baseline, with 8-bromo-cGMP (10 −7 , 10 −6 , and 10 −5 M), with erythro-9-(2-hydroxy-3-nonyl)adenine [EHNA; a cAMP phosphodiesterase (PDE 2 ) inhibitor] plus 8-bromo-cGMP, or milrinone (a PDE 3 inhibitor) plus 8-bromo-cGMP. Baseline percent shortening and maximal rates of shortening (R max ) and relaxation were slightly reduced in hypertrophic myocytes and were significantly lower in failing myocytes (R max : control dogs, 95.3 ± 17.3; hypertrophy dogs, 88.2 ± 5.5; failure dogs, 53.2 ± 6.4 μm/s). 8-Bromo-cGMP dose dependently reduced myocyte function in all groups. However, EHNA (10 −6 M) and milrinone (10 −6 M) significantly reduced the negative effects of cGMP on cell contractility in control and hypertrophy but not in failing myocytes (R max for control dogs: cGMP, −46%; +EHNA, −21%; +milrinone, −19%; for hypertrophy dogs: cGMP, −40%; +EHNA, −13%; +milrinone, −20%; for failure dogs: cGMP, −40%; +EHNA, −29%; +milrinone, −32%). Both combinations of EHNA-cGMP and milrinone-cGMP significantly increased intracellular cAMP in control, hypertrophic, and failing myocytes. These data indicated that the cGMP signaling pathway was preserved in hypertrophic failing cardiac myocytes. However, the interaction of cGMP with the cAMP signaling pathway was impaired in these failing myocytes." @default.
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• W2170755025 date "2005-09-01" @default.
• W2170755025 modified "2023-09-28" @default.
• W2170755025 title "Reduction in interaction between cGMP and cAMP in dog ventricular myocytes with hypertrophic failure" @default.
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• W2170755025 doi "https://doi.org/10.1152/ajpheart.01234.2003" @default.
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