Folic acid prevented and partially reversed both ACTH and Dex hypertension in rats without modifying the increase in plasma F(2)-isoprostane concentrations. Given that BH(4) failed to prevent ACTH or Dex hypertension, folic acid is unlikely to be acting through increased BH(4) production. The precise mechanism for the BP-lowering effect of folic acid in this model of hypertension remains to be determined.
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