Differential effects of statins on endogenous H2S formation in perivascular adipose tissue.
Hydrogen sulfide (H(2)S) is a new gasotransmitter synthesized enzymatically from l-cysteine in cytosol and is oxidized in mitochondria. In the cardiovascular system, H(2)S regulates vascular tone, inhibits atherogenesis, and protects against myocardial ischemia-reperfusion injury. We examined the effect of statins on vascular H(2)S production. Male Wistar rats received pravastatin (40mg/kg/day) or atorvastatin (20mg/kg/day) for 3 weeks and then H(2)S formation was measured in aortic media, periaortic adipose tissue (PAAT) and the liver. Only atorvastatin increased H(2)S production in PAAT whereas both statins stimulated its formation in the liver. Neither statin affected H(2)S production in aortic media. H(2)S formation in post-mitochondrial supernatant was higher than in mitochondria-containing supernatant and was not influenced by statins in any tissue. In addition, oxidation of exogenous H(2)S in isolated liver mitochondria was slower in statin-treated than in control rats. These data indicate that statins increase net H(2)S production by inhibiting its mitochondrial oxidation. Statins had no effect on the activity of H(2)S-metabolizing enzyme, sulfide:quinone oxidoreductase, measured at saturating coenzyme Q concentration. Both statins reduced CoQ(9) concentration in plasma and liver, but only atorvastatin decreased CoQ(9) in PAAT. Atorvastatin attenuated phenylephrine-induced contraction of PAAT+ but not of PAAT- aortic rings. Effects of atorvastatin on net H(2)S production, mitochondrial H(2)S oxidation and aortic contractility were abolished by supplementation of exogenous CoQ(9). In conclusion, lipophilic atorvastatin, but not hydrophilic pravastatin, increases net H(2)S production in perivascular adipose tissue by inhibiting its mitochondrial oxidation. This effect is mediated by statin-induced CoQ(9) deficiency and results in the augmentation of anticontractile effect of perivascular adipose tissue.
Department of Pathophysiology, Medical University, Jaczewskiego 8, 20-090 Lublin, Poland.
Grażyna
G
Wójcicka
Anna
A
Jamroz-Wiśniewska
Pepa
P
Atanasova
George N
GN
Chaldakov
Beata
B
Chylińska-Kula
Jerzy
J
Bełtowski
D000273:Adipose Tissue / Q000187:drug effects* / Q000378:metabolism; D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects* / Q000378:metabolism; D000069059:Atorvastatin; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D004305:Dose-Response Relationship, Drug; D006538:Heptanoic Acids / Q000494:pharmacology*; D006862:Hydrogen Sulfide / Q000378:metabolism*; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000494:pharmacology*; D054086:KATP Channels / Q000187:drug effects / Q000378:metabolism; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008930:Mitochondria, Liver / Q000187:drug effects / Q000378:metabolism; D010084:Oxidation-Reduction; D026902:Potassium Channel Blockers / Q000494:pharmacology; D017035:Pravastatin / Q000494:pharmacology*; D011758:Pyrroles / Q000494:pharmacology*; D011808:Quinone Reductases / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013440:Sulfides / Q000378:metabolism; D014280:Triglycerides / Q000097:blood; D014451:Ubiquinone / Q000031:analogs & derivatives / Q000378:metabolism; D014662:Vasoconstrictor Agents / Q000494:pharmacology; D014664:Vasodilation / Q000187:drug effects*
D008076:Cholesterol, HDL; D006538:Heptanoic Acids; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D054086:KATP Channels; D026902:Potassium Channel Blockers; D011758:Pyrroles; D013440:Sulfides; D014280:Triglycerides; D014662:Vasoconstrictor Agents; D014451:Ubiquinone; D002784:Cholesterol; D000069059:Atorvastatin; D011808:Quinone Reductases; C073412:sulfide quinone reductase; C024989:coenzyme Q10; C025451:sodium bisulfide; D017035:Pravastatin; D006862:Hydrogen Sulfide