On the effects of psychostimulants, antidepressants, and the antiparkinsonian drug levodopa on dopamine neurons.
The dopaminergic system constitutes the principal target of many psychostimulants, antidepressant, and antiparkinsonian drugs. The effects caused by these compounds are partly associated with an increased dopamine (DA) levels within the terminal areas of DA neurons and in the ventral midbrain. Therefore, several substances of abuse, antidepressants, and endogenous compounds (levodopa and trace amines [TAs]) regulate the activity of DA cells by activating D2 autoreceptors located on the terminals, soma, and dendrites. Considering our past and recent experimental studies on this issue, here we will briefly reexamine the mechanisms of action of several psychoactive drugs on DA neurons. In particular, we propose three different modalities by which the mesencephalic DA neurons can be regulated by drugs: amphetamine/TAs-like, cocaine-like, and levodopa-like. We, therefore, discuss the potential therapeutic and addictive properties of the psychoactive substances.
Geracitano
Raffaella
R
Experimental Neurology, Laboratory - C.E.R.C.- Fondazione S. Lucia I.R.C.C.S., Via del Fosso di Fiorano, 65-00143 Rome, Italy.
Federici
Mauro
M
Bernardi
Giorgio
G
Mercuri
Nicola B
NB
D000661:Amphetamine / Q000494:pharmacology; D000818:Animals; D000978:Antiparkinson Agents / Q000494:pharmacology*; D003042:Cocaine / Q000031:analogs & derivatives; D004298:Dopamine / Q000378:metabolism*; D050483:Dopamine Plasma Membrane Transport Proteins / Q000378:metabolism; D006801:Humans; D007980:Levodopa / Q000494:pharmacology*; D009474:Neurons / Q000187:drug effects*; D011619:Psychotropic Drugs / Q000494:pharmacology*; D051381:Rats
D000978:Antiparkinson Agents; D050483:Dopamine Plasma Membrane Transport Proteins; D011619:Psychotropic Drugs; D007980:Levodopa; D000661:Amphetamine; D003042:Cocaine; D004298:Dopamine