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Nitric oxide: not just a negative inotrope.
D Sarkar1, P Vallance, S E Harding
1Department of Cardiac Medicine, National Heart and Lung Institute, Imperial College School of Medicine, Dovehouse St, London SW3 6LY, UK. d.sarkar@ucl.ac.uk
European Journal of Heart Failure
|October 12, 2001
Summary
Nitric oxide (NO) has complex effects on cardiac function, acting as both a depressant and stimulant. Understanding its varied roles and targeting specific pathways is key for therapeutic applications.
Area of Science:
- Cardiology
- Molecular Biology
- Biochemistry
Background:
- Nitric oxide (NO) influences cardiac function in health and disease.
- Evidence suggests a functional NO system in the human myocardium, upregulated in disease.
- Induction of inducible nitric oxide synthase (iNOS) in failing myocardium needs functional validation.
Purpose of the Study:
- To investigate the dual role of nitric oxide (NO) in cardiac function.
- To explore the impact of different NO donors and species on cardiac myocytes.
- To understand the contradictory effects of NO on cardiac contractility.
Main Methods:
- Studies on isolated rodent and human cardiac myocytes.
- Administration of various exogenous nitric oxide (NO) donors.
- Analysis of NO species (NO., NO+, NO-) and their release kinetics.
Main Results:
- Early studies showed NO as a negative inotrope in rodent myocytes.
- Recent findings demonstrate NO as a positive inotrope in both rodent and human myocytes.
- Different NO donors yield varied effects due to release kinetics and species.
Conclusions:
- Nitric oxide (NO) exhibits complex, context-dependent effects on cardiac contractility.
- The observed effects of NO are a net result of interactions with multiple subcellular targets.
- Therapeutic strategies require precise subcellular targeting of NO pathways.