Suppression of rotenone-induced behavioral dysfunction by
4-PBA. Mice were orally administered rotenone at 30 mg/kg daily for
28 days, and 4-PBA [at 15 (closed reverse triangle) at 40 (closed
square) or 120 mg/kg (closed triangle); eachn= 4] or saline (closed
circle, n= 4) was injected i.p. repeatedly 30 min before each oral
administration of rotenone. As a control, mice were orally administered
the vehicle daily for 28 days, and 4-PBA (open triangle, n=4) or
saline (open circle, n= 4) was injected 30 min before each oral
administration of rotenone. At 28 days, treated mice were tested for their ability to stay on the rotating rod. The speed of the rotating rod
was accelerated in a stepwise manner (2 rpm, steps at intervals of
30 s). Time-dependent changes in the percentage (%) of mice
remaining on the rotating rod. Mice that had received oral rotenone
showed significantly greater motor dysfunction than those that had
received vehicle (p= 0.0018 by the log-rank test). Rotenone-induced
dysfunction was significantly restored by 4-PBA at 120 mg/kg
(p= 0.0018), but not 15 (p= 0.9529) or 40 mg/kg (p= 0.5014