Social enrichment attenuates nigrostriatal lesioning and reverses motor impairment in a progressive 1-methyl-2-phenyl-1,2,3,6-tetrahydropyridine (MPTP) mouse model of Parkinson's disease

► Social enrichment (SocE) reverses behavioral deficit following partial MPTP lesion. ► SocE attenuates TH loss in the SNpc. ► SocE prevents continued TH loss in the CPu.