Elsevier

Cytokine

Volume 6, Issue 4, July 1994, Pages 365-367
Cytokine

Original contribution
Neurochemical basis of interleukin 2-modified discrimination behaviour

https://doi.org/10.1016/1043-4666(94)90059-0Get rights and content

Abstract

We trained one group of rats to discriminate 0.8 mg/kg intraperitoneal (i.p.) d-amphetamine from 1 ml/kg saline and the other to discriminate 0.3 mg/kg i.p. (±)-ethylketocyclazocine (EKC) from saline. Recombinant human interleukin 2 (rIL-2), 2 × 106 U/kg (or 8.2 nmol/kg) given i.p. 1 h prior to tests, potentiated responses elicited by 0.4 mg/kg d-amphetamine. This potentiation of d-amphetamine responses was suppressed by the opioid receptor antagonist naloxone (1 mg/kg) when administered i.p. together with IL-2. IL-2 (4 × 106 U/kg) alone produced EKC-like responses in the EKC-trained animals. The cytokine also potentiated 0.1 mg/kg EKC responses at 2 × 106 U/kg, an action that was suppressed by 1 mg/kg naloxone. Data from the present study show that IL-2 exerts the same neurochemical action as that previously observed with IFN-α for both d-amphetamine and EKC discrimination in rats.

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