Hydrogen peroxide (H2O2), important reactive oxygen species produced endogenously, may have different physiological actions. The superoxide anion (O2 •_) is suggested to be part of the signaling mechanisms activated by angiotensin II (ANG II) and central virus-mediated overexpression of the enzyme superoxide dismutase (that dismutates O2 •_ to H2O2) reduces pressor and dipsogenic responses to central ANG II. Wh...