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Antiretrovirals induce direct endothelial dysfunction in vivo
Bo Jiang1, Valeria Y Hebert, James H Zavecz
1From the Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.
Summary
Certain antiretrovirals, like azidothymidine (AZT), may directly harm blood vessel function, contributing to cardiovascular risks in HIV patients. This study investigated the direct impact of HIV drugs on endothelial dysfunction.
Area of Science:
- Cardiovascular Science
- Pharmacology
- Virology
Background:
- HIV-associated cardiovascular diseases are prevalent but their direct causes remain unclear.
- Endothelial dysfunction is an early indicator of atherosclerosis, potentially linked to HIV treatments.
- Protease inhibitors are suspected to cause endothelial dysfunction via lipid level alterations.
Purpose of the Study:
- To investigate if nucleoside reverse transcriptase inhibitors (NRTIs) and protease inhibitors (PIs) induce endothelial dysfunction.
- To determine if drug-induced endothelial dysfunction is dependent on altered plasma lipid concentrations.
- To assess the direct vascular effects of specific antiretroviral drugs.
Main Methods:
- Male Sprague-Dawley rats were administered pharmacological doses of azidothymidine (AZT), indinavir, or a combination.
- Endothelial function was evaluated in aortic rings using isometric force measurement.
- Plasma lipid levels and endothelin-1 concentrations were measured.
Main Results:
- AZT and AZT plus indinavir significantly reduced endothelium-dependent vessel relaxation.
- AZT treatment alone did not alter cholesterol or triglyceride levels.
- Indinavir increased plasma cholesterol but did not affect endothelial function; AZT plus indinavir elevated endothelin-1.
Conclusions:
- Antiretrovirals, particularly AZT (an NRTI), may directly impact vascular endothelium function.
- AZT-induced endothelial dysfunction could be a contributing factor to cardiovascular diseases in HIV patients.
- The findings suggest mechanisms beyond lipid modulation for antiretroviral-induced cardiovascular risks.