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          Tuesday, September 26, 2017

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Curcumin blocks detrimental effects of ritonavir

HIV protease inhibitor ritonavir (RTV) is associated with many cardiovascular complications and causes vascular dysfunction through oxidative stress. In the present study, we determined the effects of RTV and curcumin (a pigment derived from turmeric) on porcine coronary arteries.

Artery rings were incubated with 15 muM concentration of RTV and curcumin (5 or 10 muM) for 24 hours. Vasomotor function was studied with a myograph tension system. Endothelial nitric oxide synthase (eNOS) mRNA and protein levels were studied using real-time polymerase chain reaction, Western blot, and immunohistochemistry. Nitric oxide was measured using Griess assay. Superoxide anion levels were determined by lucigenin enhanced chemiluminescence.

RTV considerably reduced vessel contraction by 71 percent, endothelium-dependent relaxation by 59 percent, and endothelium-independent relaxation by 52 percent, as compared with controls. Curcumin effectively blocked RTV-induced vasomotor dysfunction. RTV-treated arteries showed substantial reductions of eNOS mRNA by 77 percent, eNOS protein by 72 percent, and nitric oxide release by 37 percent as compared with controls. The RTV plus curcumin-treated vessels showed substantial increases of eNOS and nitric oxide levels as compared with the RTV-treated vessels. Finally, there was a 47 percent increase of superoxide anion production in the RTV-treated vessels as compared with controls. Again, curcumin effectively reversed this effect of RTV.

HIV protease inhibitor RTV impairs vasomotor functions, reduces eNOS expression and nitric oxide release, and increases oxidative stress in porcine coronary arteries. Curcumin effectively blocks these detrimental effects of RTV.
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