Influence of brain catalase on ethanol-induced loss of righting reflex in mice.

The effect of lead acetate and 3-amino-1, 2, 4-triazole (AT) on ethanol-induced loss of righting reflex (LORR) and brain catalase activity was studied in an attempt to confirm earlier observations on the involvement of catalase in ethanol-induced effects. Lead acetate (0 or 100 mg/kg) or AT (0 or 500 mg/kg) was injected (acutely) into mice 7 days or 5 h before testing. Other mice were exposed to drinking fluid containing 500 ppm lead acetate for 60 days. On the test day, mice received an intraperitoneal injection of ethanol (4.0 or 4.5 g/kg) and the duration of LORR was recorded. Acute lead-treated animals demonstrated a reduction in the duration of the LORR. However, both chronic administration of lead acetate and AT treatment increased the duration of ethanol-produced LORR. Furthermore, brain catalase activity in acute lead pretreated animals showed a significant induction, whereas it was reduced in chronic lead and AT treated mice. These results suggest that brain catalase activity, and by implication centrally formed acetaldehyde, may modulate ethanol-induced LORR.