NDLI: Chronic administration during early adulthood does not alter the hormonally-dependent disruptive effects of delta-9-tetrahydrocannabinol (Δ9-THC) on complex behavior in female rats

Content Provider	PubMed Central
Author	Winsauer, Peter J. Sutton, Jessie L.
Copyright Year	2013
Abstract	This study examined whether chronic Δ9-THC during early adulthood would produce the same hormonally-dependent deficits in learning that are produced by chronic Δ9-THC during adolescence. To do this, either sham-operated (Intact) or ovariectomized (OVX) female rats received daily saline or 5.6 mg/kg of Δ9-THC i.p. for 40 days during early adulthood. Following chronic administration, and a drug-free period to train both a learning and performance task, acute dose-effect curves for Δ9-THC (0.56–10 mg/kg) were established in each of the four groups (intact/saline, intact/THC, OVX/saline and OVX/THC). The dependent measures of responding under the learning and performance tasks were the overall response rate and the percentage of errors. Although the history of OVX and chronic Δ9-THC in early adulthood did not significantly affect non-drug or baseline behavior under the tasks, acute administration of Δ9-THC produced both rate-decreasing and error-increasing effects on learning and performance behavior, and these effects were dependent on their hormone condition. More specifically, both intact groups were more sensitive to the rate-decreasing and error-increasing effects of Δ9-THC than the OVX groups irrespective of chronic Δ9-THC administration, as there was no significant main effect of chronic treatment and no significant interaction between chronic treatment (saline or Δ9-THC) and the dose of Δ9-THC administered as an adult. Post mortem examination of 10 brain regions also indicated there were significant differences in agonist-stimulated GTPγS binding across brain regions, but no significant effects of chronic treatment and no significant interaction between the chronic treatment and cannabinoid signaling. Thus, acute Δ9-THC produced hormonally-dependent effects on learning and performance behavior, but a period of chronic administration during early adulthood did not alter these effects significantly, which is contrary to what we and others have shown for chronic administration during adolescence.
Related Links	http://dx.doi.org/10.1016/j.pbb.2013.12.014
Ending Page	127
Page Count	10
Starting Page	118
File Format	PDF
ISSN	00913057
e-ISSN	18735177
Journal	Pharmacology, biochemistry, and behavior
Volume Number	117
Language	English
Publisher Date	2014-02-01
Access Restriction	Open
Subject Keyword	Toxicology Clinical Biochemistry Biochemistry Biological Psychiatry Behavioral Neuroscience Pharmacology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biological Psychiatry Behavioral Neuroscience Biochemistry Clinical Biochemistry Toxicology Pharmacology

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