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17) These observations suggest that long-term effects of Cannabis exposure on heroin addictive liability and emotionality are dependent on individual genetic background.
* Strain dependence of adolescent Cannabis influence on heroin reward and mesolimbic dopamine transmission in adult Lewis and Fischer 344 rats.
- Adolescent Cannabis exposure has been hypothesized to act as a gateway to opiate abuse. In order to investigate the role of genetic background in cannabinoid-opiate interactions, we studied the effect of Δ(9) -tetrahydrocannabinol (THC) exposure of adolescent Lewis and Fischer 344 rats on the responsiveness of accumbens shell and core dopamine (DA), as monitored by microdialysis, to THC and heroin at adulthood. Heroin reward and reinstatement by heroin priming were studied by conditioned place preference (CPP) and cognitive and emotional functions by object recognition, Y maze and elevated plus maze paradigms. THC stimulated shell DA in Lewis but not in Fischer 344 rats. Adolescent THC exposure potentiated DA stimulant effects of heroin in the shell and core of Lewis and only in the core of Fischer 344 rats. Control Lewis rats developed stronger CPP to heroin and resistance to extinction compared with Fischer 344 strain. In Lewis rats, THC exposure did not affect heroin CPP but potentiated the effect of heroin priming. In Fischer 344 rats, THC exposure increased heroin CPP and made it resistant to extinction. Lewis rats showed seeking reactions during extinction and hedonic reactions in response to heroin priming. Moreover, adolescent THC exposure affected emotional function only in Lewis rats. These observations suggest that long-term effects of Cannabis exposure on heroin addictive liability and emotionality are dependent on individual genetic background.
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Overview of noun effects
The noun effects has 1 sense (no senses from tagged texts)
1. effects, personal effects -- (property of a personal character that is portable but not used in
business; "she left some of her personal effects in the house"; "I watched over their effects until
they returned")
Overview of noun effect
The noun effect has 6 senses (first 5 from tagged texts)
1. (101) consequence, effect, outcome, result, event, issue, upshot -- (a phenomenon that follows
and is caused by some previous phenomenon; "the magnetic effect was greater when the rod was
lengthwise"; "his decision had depressing consequences for business"; "he acted very wise after the
event")
2. (11) impression, effect -- (an outward appearance; "he made a good impression"; "I wanted to
create an impression of success"; "she retained that bold effect in her reproductions of the
original painting")
3. (9) effect -- (an impression (especially one that is artificial or contrived); "he just did it
for effect")
4. (2) effect, essence, burden, core, gist -- (the central meaning or theme of a speech or literary
work)
5. (1) effect, force -- ((of a law) having legal validity; "the law is still in effect")
6. effect -- (a symptom caused by an illness or a drug; "the effects of sleep loss"; "the effect of
the anesthetic")
Overview of verb effect
The verb effect has 2 senses (first 2 from tagged texts)
1. (17) effect, effectuate, set up -- (produce; "The scientists set up a shock wave")
2. (3) effect -- (act so as to bring into existence; "effect a change")
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