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The Journal of Neuroscience, June 1, 2003, 23(11):4712-4716
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Evidence for Enhanced Neurobehavioral Vulnerability to Nicotine during Periadolescence in Rats
Walter Adriani,1
Sabine Spijker,2
Véronique Deroche-Gamonet,1
Giovanni Laviola,3
Michel Le Moal,1
August B. Smit,2 and
Pier Vincenzo Piazza1
1 Institut National de la Santé et de la Recherche Médicale U588,
Université "V. Segalen", Bordeaux 2, Domaine de Carreire,
33077 Bordeaux, France,
2 Department of Molecular and Cellular Neurobiology, Institute of Neurosciences,
Faculty of Earth and Life Sciences, Vrije Universiteit, 1081 HV Amsterdam, The
Netherlands, and
3 Section of Behavioral Pathophysiology, Laboratory di Fisiopatologia di Organo
e di Sistema, Istituto Superiore di Sanita, 00161 Rome, Italy
Epidemiological studies indicate that there is an increased likelihood for
the development of nicotine addiction when cigarette smoking starts early
during adolescence. These observations suggest that adolescence could be a
"critical" ontogenetic period, during which drugs of abuse have
distinct effects responsible for the development of dependence later in life.
We compared the long-term behavioral and molecular effects of repeated
nicotine treatment during either periadolescence or postadolescence in rats.
It was found that exposure to nicotine during periadolescence, but not a
similar exposure in the postadolescent period, increased the intravenous
self-administration of nicotine and the expression of distinct subunits of the
ligand-gated acetylcholine receptor in adult animals. Both these changes
indicated an increased sensitivity to the addictive properties of nicotine. In
conclusion, adolescence seems to be a critical developmental period,
characterized by enhanced neurobehavioral vulnerability to nicotine.
Key words: nicotine; adolescence; intravenous; self-administration; acetylcholine receptor; PCR
Received Dec. 5, 2002;
revised Mar. 5, 2003;
accepted Mar. 6, 2003.
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