Abstract
Rationale
Previous research indicates that progesterone (PROG) decreased cocaine-seeking behavior in female rats. This effect of PROG may be in part due to its metabolite allopregnanolone (ALLO), which has been shown to decrease the sensitizing effects of cocaine and reduce lethality associated with cocaine overdose in mice.
Objective
The purpose of the present study was to examine the effects of ALLO on the reinstatement of cocaine-seeking behavior in female and male rats.
Methods
Rats were trained to lever press for i.v. infusions of cocaine (0.4 mg/kg per infusion) during 2-h sessions, and once acquisition criteria were met, cocaine self-administration continued for 14 days. Cocaine was then replaced with saline, and lever pressing was allowed to extinguish over 21 days. After the extinction phase, rats received s.c. ALLO (15 or 30 mg/kg), PROG (0.5 mg/kg), PROG (0.5 mg/kg) plus the 5-alpha reductase inhibitor finasteride (25 mg/kg), or vehicle pretreatment for 3 days. Rats were then tested during reinstatement with three doses of cocaine (5, 10, and 15 mg/kg, i.p. in mixed order).
Results
PROG, and to a greater extent ALLO, decreased cocaine-primed reinstatement in females, while finasteride blocked the attenuating effects of PROG on reinstatement. ALLO had no effect on cocaine-primed reinstatement in males.
Conclusion
These findings suggest that ALLO may explain part of PROG’s inhibitory effect on cocaine-primed reinstatement, and it may serve as a novel approach for preventing relapse in female cocaine abusers.
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Acknowledgements
This research was supported by funding from the National Institute on Drug Abuse grants: R01 DA 003240-24, K05 015267-06 (MEC) and F31 DA 023301-01 (JJA). We appreciate the technical assistance of Luke Gliddon, Kari Haug, and Jennifer Pawlik.
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Anker, J.J., Holtz, N.A., Zlebnik, N. et al. Effects of allopregnanolone on the reinstatement of cocaine-seeking behavior in male and female rats. Psychopharmacology 203, 63–72 (2009). https://doi.org/10.1007/s00213-008-1371-9
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DOI: https://doi.org/10.1007/s00213-008-1371-9