A dopamine mechanism is implied in the acquisition and expression of amphetamine and stress-induced effects observed in the lymphocyte subpopulations.

ASSIS AMPARO; PACCHIONI MA; COLLINO C; PAZ MC; SOTOMAYOR CE; BASSO AM; CANCELA L

ELSEVIER SCIENCE BV

Año: 2008 vol. 584 p. 405 - 405

p class="abstract" style="MARGIN: auto 0pt auto 36pt">Drugs of abuse and stress are associated with changes in circulating cell populations and reductions in cell-mediated immune responses. The main goal of this study was to determine the influence of repeated and acute d-amphetamine treatments on the foot-shock stress-induced effects on the peripheral lymphocyte subpopulations, and the involvement of a dopamine mechanism in the development and expression of this phenomenon. Wistar rats received an acute (5 mg/kg/day i.p.) or a repeated (2 mg/kg/day i.p. during 9 days) amphetamine treatment, and were exposed to a foot-shock stress (1 mA, 3 s) 4 days after the last amphetamine injection. Another group was administered with haloperidol (1 mg/kg/day i.p.) 15 min previous to each daily amphetamine injection or previous to the foot-shock stress session. Then, blood cells stained with monoclonal antibodies