These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Nicotine and ethanol interact during adolescence: effects on the central cholinergic systems.
    Author: Ribeiro-Carvalho A, Lima CS, Filgueiras CC, Manhães AC, Abreu-Villaça Y.
    Journal: Brain Res; 2008 Sep 26; 1232():48-60. PubMed ID: 18692029.
    Abstract:
    Co-occurrence of tobacco smoking and alcohol consumption during adolescence is frequent and well documented. However, little is known about the basic neurobiology of the combined exposure in the adolescent brain. Since nicotine is a cholinergic agonist and it has been shown that ethanol interferes with nicotinic acetylcholine receptors (nAChRs), the current work focused on cholinergic systems. From the 30th to the 45th postnatal day (PN), C57BL/6 male and female mice were exposed to nicotine free base (NIC) and/or ethanol (ETOH). Four groups were analyzed: 1) concomitant NIC (50 microg/ml in 2% saccharin to drink) and ETOH (25%, 2 g/kg i.p. injected every other day) exposure; 2) NIC exposure; 3) ETOH exposure; 4) vehicle. We assessed nAChR binding, choline acetyltransferase (ChAT) activity and [3H]hemicholinium-3 (HC-3) binding in the cerebral cortex and midbrain of mice on PN45. In the cortex, ETOH had no effect on nAChRs. In contrast, NIC produced nAChR upregulation while NIC+ETOH elicited a more pronounced effect. In the midbrain, neither ETOH nor NIC had effects on nAChRs. NIC+ETOH, however, elicited a robust nAChR upregulation. Regarding ChAT activity, treatment effects differed between males and females in the cortex. Male NIC mice presented an increase in ChAT. However, ETOH reversed this effect. In contrast, female NIC mice presented decreased ChAT activity. In the midbrain, ETOH increased ChAT. HC-3 binding was not affected. These results indicate that the central cholinergic system is a site at which nicotine and ethanol interact. This interaction might underlie the association between tobacco and alcohol consumption during adolescence.
    [Abstract] [Full Text] [Related] [New Search]