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[Decrease of nitric oxide (NO)-cGMP-dependent vasodilatation in the vessels of lesser circulation in endothelial
Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|April 20, 2005
Summary
Aminoguanidine (AG) treatment reversed pulmonary hypertension (PH) in rats by restoring nitric oxide (NO) production and improving blood vessel function. This suggests AG could be a potential therapeutic for PH.
Area of Science:
- Pharmacology
- Cardiovascular Physiology
- Biochemistry
Context:
- Pulmonary hypertension (PH) involves elevated pulmonary artery pressure and endothelial dysfunction.
- Nitric oxide (NO) plays a crucial role in regulating pulmonary vascular tone.
- Inducible nitric oxide synthase (iNOS) contributes to NO overproduction in certain PH models.
Purpose:
- To investigate the effect of aminoguanidine (AG), an inducible NO-synthase inhibitor, on established monocrotaline (MCT)-induced pulmonary hypertension in rats.
- To assess the impact of chronic AG administration on nitric oxide production, endothelial function, and right ventricular pressure.
Summary:
- PH was induced in Wistar rats using MCT injection.
- Rats received AG in drinking water, while controls received plain water.
- Measurements included urinary nitrite/nitrate excretion (RENOx), soluble guanylate cyclase (sGC) activity, right ventricular pressure, and isolated pulmonary artery responses.
- Chronic AG administration normalized elevated RENOx, restored sGC activity, partially reduced right ventricular pressure, and improved endothelium-dependent relaxation in pulmonary arteries.
Impact:
- Chronic inhibition of inducible NO-synthase with AG demonstrates a therapeutic potential for pulmonary hypertension.
- Restoration of NO-dependent pathways and vascular relaxation is key to mitigating PH.
- This study provides evidence for targeting iNOS in the management of endothelial dysfunction-related PH.