Effect of Neutral Endopeptidase Inhibition on the Actions of Adrenomedullin and Endothelin-1 in Resistance Arteries From Patients With Chronic Heart Failure
| Autor: | Fiona Johnston, Chris Hillier, Mark C. Petrie, John J.V. McMurray |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Male
Thiorphan medicine.medical_specialty Vasodilation In Vitro Techniques Adrenomedullin chemistry.chemical_compound Internal medicine Internal Medicine Humans Medicine Protease Inhibitors Neprilysin Antihypertensive Agents Heart Failure Dose-Response Relationship Drug Endothelin-1 business.industry Arteries Endothelin 1 Endocrinology medicine.anatomical_structure chemistry Vasoconstriction Chronic Disease Female Vascular Resistance medicine.symptom Peptides business Endothelin receptor Blood vessel |
| Zdroj: | Hypertension. 38:412-416 |
| ISSN: | 1524-4563 0194-911X |
| DOI: | 10.1161/01.hyp.38.3.412 |
| Popis: | Adrenomedullin and endothelin are novel peptides that are produced in the blood vessel wall and have contrasting biologic actions. Both may play a pathophysiological role in atherosclerosis and chronic heart failure. It has also been suggested that both peptides may be metabolized by neutral endopeptidase and that pharmacological manipulation of this enzyme may be of therapeutic interest. We investigated the effect of thiorphan, a neutral endopeptidase inhibitor, on the vasodilator response to adrenomedullin and the vasoconstrictor response to endothelin in small resistance arteries taken from patients with heart failure caused by coronary heart disease. Small resistance arteries were dissected from gluteal biopsy samples and studied with wire myography. Thiorphan did not affect the vasodilator response to adrenomedullin in arteries preconstricted with norepinephrine. Maximal responses were 66% (SD 11%) and 72% (8%) in the absence and presence of thiorphan, respectively (n=8). The vasoconstrictor response to endothelin was also unaffected. The maximum vasoconstrictor responses in the absence and presence of thiorphan were 152% (11%) and 132% (12%), respectively (n=8). The values of corresponding −log concentrations of agonist required to effect a 50% response (pD 2 ) were 8.52 (0.11) and 8.64 (0.15), respectively. We showed that the inhibition of neutral endopeptidase does not augment the vasodilator and vasoconstrictor activities of adrenomedullin and endothelin, respectively, in small resistance arteries from patients with chronic heart failure. This suggests that neutral endopeptidase inhibition, as a therapeutic strategy, will enhance neither the potentially desirable vascular actions of adrenomedullin nor the potentially unfavorable vascular effects of endothelin-1 in human cardiovascular disease states. |
| Databáze: | OpenAIRE |
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