Moalem J, Weiss HR, Davidov T, Rodriguez R, Molino B, Lazar MJ, Scholz PM. Heart failure reduces both the effects and interaction between cyclic GMP and cyclic AMP.
J Surg Res 2006;
134:300-6. [PMID:
16545395 DOI:
10.1016/j.jss.2006.01.015]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2005] [Revised: 01/05/2006] [Accepted: 01/09/2006] [Indexed: 10/24/2022]
Abstract
BACKGROUND
We tested the hypothesis that the negative functional effects of cyclic GMP would be attenuated by cyclic AMP and this interaction would be reduced in pacing-induced failure of hypertrophic hearts.
MATERIALS AND METHODS
8-Bromo-cGMP (2 microg/kg/min) was infused into a coronary artery in eight control, eight ventricular hypertrophy (HYP), and eight hypertrophic failure (HYP-FAIL) dogs. Then isoproterenol (0.1 microg/kg/min) was infused, followed by 8 Br-cGMP. Regional myocardial work (force*shortening/min), and O(2) consumption (VO(2)) (coronary blood flow*O(2) extraction) were measured. Cyclic GMP levels were determined by radioimmunoassay.
RESULTS
8-Br-cGMP significantly decreased regional work from 3812 +/- 839 g*mm/min by 17% and VO(2) by 29% in control, but not in HYP (1073 +/- 182 by -10%, VO(2) by -16%) or HYP-FAIL (495 +/- 145 by -9%, VO(2) by 0%). Isoproterenol increased work by 43% and VO(2) by 48% in controls and in HYP (work by 54%, VO(2) by 39%), but not in HYP-FAIL (work by -28%, VO(2) by -5%). Subsequently, 8-Br-cGMP had no effect on work or VO(2) in control (-2%, -13%), HYP (-12%, -30%), or HYP-FAIL (+13%, +14%). Cyclic AMP levels were elevated by isoproterenol in control (381 +/- 115 versus 553 +/- 119 pmol/g) and HYP (313 +/- 55 versus 486 +/- 227), but not in HYP-FAIL (300 +/- 60 versus 284 +/- 126). After isoproterenol, 8-Br-cGMP further elevated cyclic AMP in control (687 +/- 122), but not in HYP or HYP-FAIL.
CONCLUSIONS
In controls, cyclic AMP attenuated cyclic GMPs negative functional and metabolic effects. The effects and the interaction were blunted in the HYP and HYP-FAIL groups.
Collapse