Exposure to light accelerates the formation of dopamine from exogenous L-dopa in the rat retina.


Dopaminergic neurons of retina are activated when rats are placed in a lighted environment. L-DOPA, the precursor of dopamine, was administered to rats that were housed either in the light or the dark. In the light more dopamine and its metabolite 3,4-dihydroxyphenylacetic acid were formed from L-DOPA when compared with animals given the same dose of L-DOPA… (More)