N-hydroxy-pyrroline modification of verapamil exhibits antioxidant protection of the heart against ischemia/reperfusion-induced cardiac dysfunction without compromising its calcium antagonistic activity.

Abstract

Any clinical intervention (e.g., coronary angioplasty, thrombolysis) used to reintroduce blood flow to an ischemic region of the myocardium is accompanied by a complex enzymatic cascade of reactions resulting in severe injury to the heart, termed myocardial ischemia/reperfusion (I/R) injury. In this study, we evaluated the ability of H-3010 (1-hydroxy-2,2,5,5-tetramethyl-2,5-dihydro-1H-pyrrole-3-carboxylic acid (2-(3,4-dimethoxyphenyl)-5-([2-(3,4-dimethoxyphenyl)ethyl]-methylamino)-2-isopropylpentyl)-amide), a pyrroline modification of verapamil (2-(3,4-dimethoxyphenyl)-5-[2-(3,4-dimethoxyphenyl)ethylmethyl-amino]-2-(1-methylethyl)pentanenitrile), to protect the heart against I/R-mediated injury. Isolated perfused rat hearts pretreated with verapamil and H-3010 were subjected to 30 min of global no-flow ischemia followed by 45 min of reperfusion. The recovery (expressed as a percentage of preischemic baseline) in contractile function (left ventricular developed pressure) of hearts subjected to I/R was significantly higher in hearts treated with H-3010 at 5 microM (51.0 +/- 6.4%) as well as at 50 microM (75.1 +/- 7.4%) as compared with verapamil at 5 microM (32.2 +/- 3.7%) or untreated control hearts (18.1 +/- 2.8%). Creatine kinase release was significantly attenuated in hearts treated with H-3010 (45.7 +/- 4.5 U/liter) as compared with untreated controls (131.5 +/- 6.4 U/liter). Similar trends were also observed for lactate dehydrogenase release as well. A marked reduction in percent area of infarction was observed in the H-3010 group (11.7 +/- 1.6%) compared with verapamil (25.1 +/- 2.9%) and control (41.3 +/- 1.9%) groups. Additional in vitro studies showed a marked decrease in reactive oxygen species generation with H-3010. In conclusion, our data clearly demonstrated that the verapamil derivative, H-3010, significantly decreased I/R-induced cardiac dysfunction. This can be attributed to the combined benefits of the pyrroline moiety (antioxidant) and the parent verapamil component (antiarrhythmic) in the protection of the heart from I/R-induced injury.

• Authors: Rajarsi Mandal, Vijay Kumar Kutala, Mahmood Khan, Iyyapu K Mohan, Saradhadevi Varadharaj, Arun Sridhar, Cynthia A Carnes, Tamás Kálai, Kálmán Hideg, Periannan Kuppusamy
• Journal: The Journal of pharmacology and experimental therapeutics (J Pharmacol Exp Ther) Vol. 323 Issue 1 Pg. 119-27 (Oct 2007) ISSN: 0022-3565 [Print] United States
• PMID: 17646427 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• 1-hydroxy-2,2,5,5-tetramethyl-2,5-diydro-1H-pyrrole-3-carboxylic acid (2-(3,4-dimethoxyphenyl)-5-((2-(3,4-dimethoxyphenyl)ethyl)methylamino)-2-isopropylpentyl)amide
• Calcium Channel Blockers
• Calcium Channels
• Free Radical Scavengers
• Pyrroles
• Superoxides
• Verapamil

Topics

• Action Potentials (drug effects)
• Animals
• Calcium Channel Blockers (chemistry, pharmacology)
• Calcium Channels (metabolism)
• Free Radical Scavengers (chemistry, pharmacology)
• In Vitro Techniques
• Male
• Molecular Structure
• Myocardial Contraction (drug effects)
• Myocardial Infarction (metabolism, prevention & control)
• Myocardial Reperfusion Injury (metabolism, prevention & control)
• Myocytes, Cardiac (drug effects, metabolism)
• Patch-Clamp Techniques
• Pyrroles (chemistry, pharmacology)
• Rats
• Rats, Sprague-Dawley
• Superoxides (metabolism)
• Verapamil (analogs & derivatives, chemistry, pharmacology)