NDLI: Cocaine vaccines: Antibody protection against relapse in a rat model

Content Provider	PubMed Central
Author	Carrera, M. Rocío A. Ashley, Jon A. Zhou, Bin Wirsching, Peter Koob, George F. Janda, Kim D.
Copyright Year	2000
Abstract	The efficacy of active immunization with the cocaine immunogen GNC-keyhole limpet hemocyanin (KLH) in preventing cocaine self-administration reinstatement was assessed in rats. An animal model of relapse was used where rats were trained to self-administer cocaine, subjected to a period of extinction by substituting the drug for saline, vaccinated, and re-exposed to cocaine. Compared with controls, animals immunized with GNC-KLH did not reinstate cocaine self-administration behavior when given a noncontingent cocaine infusion on two consecutive days. Upon double and triple infusions, 38–62% of vaccinated animals failed to reinstate as compared with full reinstatement in all control animals. Exposure to ad libitum cocaine reinstated baseline values in control animals and resulted in double to triple the baseline values of self-infusions in vaccinated animals, suggesting a partial antibody-mediated blockade of cocaine access to the central nervous system. This compensating effect was blocked by passive immunization pretreatment with the monoclonal IgG GNC92H2 in both vaccinated and control groups. To further assess the surmountability potential of GNC-KLH-induced antibody titers by cocaine self-administration, and the capacity of these titers to block the reinforcing effects of the drug, rats were tested at various doses of cocaine (0.015–0.5 mg/infusion). Active immunization with GNC-KLH produced approximately an 8-fold rightward shift of the dose-effect function for cocaine. The results reported suggest that immunopharmacotherapy may offer a promising means to treat cocaine abuse by aiding in the prevention of relapse.
Starting Page	6202
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	11
Volume Number	97
Language	English
Publisher	The National Academy of Sciences
Publisher Date	2000-05-23
Access Restriction	Open
Rights Holder	The National Academy of Sciences
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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