title: Comparison of Cannabinoid CB(1) Receptor Binding in Adolescent and Adult Rats: A Positron Emission Tomography Study Using [F]MK-9470.
abstract: Despite the important role of cannabinoid CB(1) receptors (CB(1)R) in brain development, little is known about their status during adolescence, a critical period for both the development of psychosis and for initiation to substance abuse. In the present study, we assessed the ontogeny of CB(1)R in adolescent and adult rats in vivo using positron emission tomography with [(18)F]MK-9470. Analysis of covariance (ANCOVA) to control for body weight that would potentially influence [(18)F]MK-9470 values between the two groups revealed a main effect of age (F(1,109)=5.0, P = 0.02) on [(18)F]MK-9470 absolute binding (calculated as percentage of injected dose) with adult estimated marginal means being higher compared to adolescents amongst 11 brain regions. This finding was confirmed using in vitro autoradiography with [(3)H]CP55,940 (F(10,99)=140.1, P < 0.0001). This ontogenetic pattern, suggesting increase of CB(1)R during the transition from adolescence to adulthood, is the opposite of most other neuroreceptor systems undergoing pruning during this period.
authors.affiliation: Schizophrenia Research Institute, Sydney, Australia.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Verdurand
authors.forename: Vu
authors.initials: V
authors.lastname: Nguyen
authors.forename: Daniela
authors.initials: D
authors.lastname: Stark
authors.forename: David
authors.initials: D
authors.lastname: Zahra
authors.forename: Marie-Claude
authors.initials: MC
authors.lastname: Gregoire
authors.forename: Ivan
authors.initials: I
authors.lastname: Greguric
authors.forename: Katerina
authors.initials: K
authors.lastname: Zavitsanou