Regulation of 5-HT1BR protein and p11 protein in unilaterally 6-OHDA-lesioned rats treated with saline, l-DOPA, or SCH23390 alone or in combination. (a) Western blots of 5-HT1BR, p11, TH, and actin in unilaterally 6-OHDA-lesioned rats treated with saline, 100 mg/kg l-DOPA (i.p., twice daily), or 0.5 mg/kg SCH23390 (i.p., twice daily) alone or in combination for 5 days. Note the near-complete absence of TH in the 6-OHDA-lesioned hemispheres. (b and c) Quantification of striatal 5-HT1BR (b) and p11 levels (c) normalized to actin. Filled bars, intact hemisphere; open bars, 6-OHDA-lesioned hemisphere. Data represent means ± SEM for 4–10 animals per group. *, P < 0.05; **, P < 0.01; ***, P < 0.001 between indicated treatments; one-way ANOVA followed by Newman–Keuls test.