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Heterozygous neuregulin 1 mice display greater baseline and Delta(9)-tetrahydrocannabinol-induced c-Fos expression.
Neuroscience. 2007 Nov 23; 149(4):861-70.N

Abstract

Cannabis use may increase the risk of developing schizophrenia by precipitating the disorder in genetically vulnerable individuals. Neuregulin 1 (NRG1) is a schizophrenia susceptibility gene and mutant mice heterozygous for the transmembrane domain of this gene (Nrg1 HET mice) exhibit a schizophrenia-related phenotype. We have recently shown that Nrg1 HET mice are more sensitive to the behavioral effects of the main psychoactive constituent of cannabis, Delta(9)-tetrahydrocannabinol (THC). In the present study, we examined the effects of THC (10 mg/kg i.p.) on neuronal activity in Nrg1 HET mice and wild type-like (WT) mice using c-Fos immunohistochemistry. In the lateral septum, THC selectively increased c-Fos expression in Nrg1 HET mice with no corresponding effect being observed in WT mice. In addition, THC promoted a greater increase in c-Fos expression in Nrg1 HET mice than WT mice in the central nucleus of the amygdala, the bed nucleus of the stria terminalis and the paraventricular nucleus of the hypothalamus. Consistent with Nrg1 HET mice exhibiting a schizophrenia-related phenotype, these mice expressed greater drug-free levels of c-Fos in two regions thought to be involved in schizophrenia, the shell of the nucleus accumbens and the lateral septum. Interestingly, the effects of genotype on c-Fos expression, drug-free or following THC exposure, were only observed when animals experienced behavioral testing prior to perfusion. This suggests an interaction with stress was necessary for the promotion of these effects. These data provide neurobiological correlates for the enhanced behavioral sensitivity of Nrg1 HET mice to THC and reinforce the existence of cannabinoid-neuregulin 1 interactions in the CNS. This research may enhance our understanding of how genetic factors increase individual vulnerability to schizophrenia and cannabis-induced psychosis.

Authors+Show Affiliations

Schizophrenia Research Institute, Sydney, NSW 2010, Australia.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17905522

Citation

Boucher, A A., et al. "Heterozygous Neuregulin 1 Mice Display Greater Baseline and Delta(9)-tetrahydrocannabinol-induced c-Fos Expression." Neuroscience, vol. 149, no. 4, 2007, pp. 861-70.
Boucher AA, Hunt GE, Karl T, et al. Heterozygous neuregulin 1 mice display greater baseline and Delta(9)-tetrahydrocannabinol-induced c-Fos expression. Neuroscience. 2007;149(4):861-70.
Boucher, A. A., Hunt, G. E., Karl, T., Micheau, J., McGregor, I. S., & Arnold, J. C. (2007). Heterozygous neuregulin 1 mice display greater baseline and Delta(9)-tetrahydrocannabinol-induced c-Fos expression. Neuroscience, 149(4), 861-70.
Boucher AA, et al. Heterozygous Neuregulin 1 Mice Display Greater Baseline and Delta(9)-tetrahydrocannabinol-induced c-Fos Expression. Neuroscience. 2007 Nov 23;149(4):861-70. PubMed PMID: 17905522.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Heterozygous neuregulin 1 mice display greater baseline and Delta(9)-tetrahydrocannabinol-induced c-Fos expression. AU - Boucher,A A, AU - Hunt,G E, AU - Karl,T, AU - Micheau,J, AU - McGregor,I S, AU - Arnold,J C, Y1 - 2007/08/28/ PY - 2007/06/14/received PY - 2007/08/16/revised PY - 2007/08/24/accepted PY - 2007/10/2/pubmed PY - 2008/3/29/medline PY - 2007/10/2/entrez SP - 861 EP - 70 JF - Neuroscience JO - Neuroscience VL - 149 IS - 4 N2 - Cannabis use may increase the risk of developing schizophrenia by precipitating the disorder in genetically vulnerable individuals. Neuregulin 1 (NRG1) is a schizophrenia susceptibility gene and mutant mice heterozygous for the transmembrane domain of this gene (Nrg1 HET mice) exhibit a schizophrenia-related phenotype. We have recently shown that Nrg1 HET mice are more sensitive to the behavioral effects of the main psychoactive constituent of cannabis, Delta(9)-tetrahydrocannabinol (THC). In the present study, we examined the effects of THC (10 mg/kg i.p.) on neuronal activity in Nrg1 HET mice and wild type-like (WT) mice using c-Fos immunohistochemistry. In the lateral septum, THC selectively increased c-Fos expression in Nrg1 HET mice with no corresponding effect being observed in WT mice. In addition, THC promoted a greater increase in c-Fos expression in Nrg1 HET mice than WT mice in the central nucleus of the amygdala, the bed nucleus of the stria terminalis and the paraventricular nucleus of the hypothalamus. Consistent with Nrg1 HET mice exhibiting a schizophrenia-related phenotype, these mice expressed greater drug-free levels of c-Fos in two regions thought to be involved in schizophrenia, the shell of the nucleus accumbens and the lateral septum. Interestingly, the effects of genotype on c-Fos expression, drug-free or following THC exposure, were only observed when animals experienced behavioral testing prior to perfusion. This suggests an interaction with stress was necessary for the promotion of these effects. These data provide neurobiological correlates for the enhanced behavioral sensitivity of Nrg1 HET mice to THC and reinforce the existence of cannabinoid-neuregulin 1 interactions in the CNS. This research may enhance our understanding of how genetic factors increase individual vulnerability to schizophrenia and cannabis-induced psychosis. SN - 0306-4522 UR - https://www.unboundmedicine.com/medline/citation/17905522/Heterozygous_neuregulin_1_mice_display_greater_baseline_and_Delta_9__tetrahydrocannabinol_induced_c_Fos_expression_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0306-4522(07)01052-4 DB - PRIME DP - Unbound Medicine ER -