Cannabidiol as an add-on therapy to overcome the slow-onset and, possibly, resistance to antidepressant treatment : involvement of NAPE-PLD in the medial prefrontal cortex. Franciele F. Scarante, Vinícius D. Lopes, Eduardo J. Fusse, Maria A. Vicente, Melissa R. Araújo, Davi S. Scomparin, Rafael P. Aguiar, Francisco S. Guimarães, Viviani Nardinid, Carlos Arterio Sorgid, Lucia H. Faccioli, RhD, PhDd, Jaime E. C. Hallak, MD, PhDe,f; Samia Joca, Kenneth Mackie, Antonio Waldo Zuardi, José Alexandre S. Crippa, Alline C. Campos. bioRxiv preprint, April 26, 2021. doi : 10.1101/2021.04.23.441143 Highlights ● In mice, cannabidiol (CBD), but not escitalopram, induced a fast-onset anti-stress action. ● Combinations of sub-effective doses [...]
Lire la suiteRecent Advances in the Neuropsychopharmacology of Serotonergic Hallucinogens Adam L. Halberstadt Behavioral Brain Research, 2015, 15, 277, 99–120. doi : 10.1016/j.bbr.2014.07.016 Abstract Serotonergic hallucinogens, such as (+)-lysergic acid diethylamide, psilocybin, and mescaline, are somewhat enigmatic substances. Although these drugs are derived from multiple chemical families, they all produce remarkably similar effects in animals and humans, and they show cross-tolerance. This article reviews the evidence demonstrating the serotonin 5-HT2A receptor is the primary site of hallucinogen action. The 5-HT2A receptor is responsible for mediating the effects of hallucinogens in human subjects, as well as in animal behavioral paradigms such as drug discrimination, head twitch response, prepulse [...]
Lire la suiteCannabidiol Administered During Peri-Adolescence Prevents Behavioral Abnormalities in an Animal Model of Schizophrenia Fernanda F. Peres, Mariana C. Diana, Raquel Levin, Mayra A. Suiama, Valéria Almeida, Ana M. Vendramini, Camila M. Santos, Antônio W. Zuardi, Jaime E. C. Hallak, José A. Crippa and Vanessa C. Abílio Frontiers in Pharmacology, 2018, 9, article 901. Doi : 10.3389/fphar.2018.00901 Schizophrenia is considered a debilitating neurodevelopmental psychiatric disorder and its pharmacotherapy remains problematic without recent major advances. The development of interventions able to prevent the emergence of schizophrenia would therefore represent an enormous progress. Here, we investigated whether treatment with cannabidiol (CBD – a compound of Cannabis sativa that [...]
Lire la suiteCannabinoid modulation of corticolimbic activation to threat in trauma-exposed adults : a preliminary study. Rabinak CA, Blanchette A, Zabik NL, Peters C, Marusak HA, Iadipaolo A, Elrahal F Psychopharmacology (Berl)., 2020, Mar 11. doi : 10.1007/s00213-020-05499-8. Science/Homme: Le THC peut être utile dans le trouble de stress post-traumatique (IACM 30 mars 2020) Lors d’une étude contrôlée par placebo avec 71 participants, composée de 3 groupes (25 témoins sains, 27 adultes exposés à un traumatisme sans trouble de stress post-traumatique et 19 patients souffrant d'un trouble de stress post-traumatique), de faibles doses de THC ont réduit la réactivité liée à la menace dans une certaine [...]
Lire la suiteClassic Hallucinogens and Mystical Experiences : Phenomenology and Neural Correlates Frederick S. Barrett, Roland R. Griffiths Current Topics in Behavioral Neurosciences, 2018, 36, 393–430. doi : 10.1007/7854_2017_474 Abstract This chapter begins with a brief review of descriptions and definitions of mystical-type experiences and the historical connection between classic hallucinogens and mystical experiences. The chapter then explores the empirical literature on experiences with classic hallucinogens in which claims about mystical or religious experiences have been made. A psychometrically validated questionnaire is described for the reliable measurement of mystical-type experiences occasioned by classic hallucinogens. Controlled laboratory studies show that under double-blind conditions that provide significant controls for [...]
Lire la suiteThe mixed serotonin receptor agonist psilocybin reduces threat-induced modulation of amygdala connectivity Rainer Kraehenmann, André Schmidt, Karl Friston, Katrin H. Preller, Erich Seifritz, Franz X. Vollenweider NeuroImage : Clinical, 2016, 11, 53–60 http://dx.doi.org/10.1016/j.nicl.2015.08.009 a b s t r a c t Stimulation of serotonergic neurotransmission by psilocybin has been shown to shift emotional biases away from negative towards positive stimuli. We have recently shown that reduced amygdala activity during threat processing might underlie psilocybin's effect on emotional processing. However, it is still not known whether psilocybin modulates bottom-up or top-down connectivity within the visual-limbic-prefrontal network underlying threat processing.We therefore analyzed our previous fMRI data using [...]
Lire la suiteCannabis Use in Adolescence : A Review of Neuroimaging Findings Yann Chye, Erynn Christensen & Murat Yücel Journal of Dual Diagnosis, 2019 Doi : 10.1080/15504263.2019.1636171 ABSTRACT Objective : Shifting policies and widespread acceptance of cannabis for medical and/or recreational purposes have fueled worries of increased cannabis initiation and use in adolescents. In particular, the adolescent period is thought to be associated with an increased susceptibility to the potential harms of repeated cannabis use, due to being a critical period for neuromaturational events in the brain. This review investigates the neuroimaging evidence of brain harms attributable to adolescent cannabis use. Methods : PubMed and Scopus searches were [...]
Lire la suiteDoes regular cannabis use affect neuroanatomy ? An updated systematic review and meta-analysis of structural neuroimaging studies Valentina Lorenzetti, Yann Chye, Pedro Silva, Nadia Solowij, Carl A. Roberts European Archives of Psychiatry and Clinical Neuroscience, 2019 Doi : 10.1007/s00406-019-00979-1 Abstract Regular cannabis use is associated with adverse cognitive and mental health outcomes that have been ascribed to aberrant neuroanatomy in brain regions densely innervated with cannabinoid receptors. Neuroanatomical differences between cannabis users and controls have been assessed in multiple structural magnetic resonance imaging (sMRI) studies. However, there is heterogeneity in the results leading to cautious interpretation of the data so far. We examined the sMRI [...]
Lire la suiteThe Role of Endocannabinoid Signaling in Cortical Inhibitory Neuron Dysfunction in Schizophrenia David W. Volk and David A. Lewis Biological Psychiatry, 2016, 79, 595-603. http://dx.doi.org/10.1016/j.biopsych.2015.06.015 ABSTRACT Cannabis use has been reported to increase the risk of developing schizophrenia and to worsen symptoms of the illness. Both of these outcomes might be attributable to the disruption by cannabis of the endogenous cannabinoid system’s spatiotemporal regulation of the inhibitory circuitry in the prefrontal cortex that is essential for core cognitive processes, such as working memory, which are impaired in schizophrenia. In the healthy brain, the endocannabinoid 2-arachidonylglycerol 1) is synthesized by diacylglycerol lipase in pyramidal neurons; 2) [...]
Lire la suiteNeuroanatomical substrates involved in cannabinoid modulation of defensive responses F.A. Moreira, D.C. Aguiar, L.B. Resstel, S.F. Lisboa, A.C. Campos, F.V. Gomes and F.S. Guimaraes Journal of Psychopharmacology, 2012, 26, (1), 40–55 DOI: 10.1177/0269881111400651 Abstract Administration of Cannabis sativa derivatives causes anxiolytic or anxiogenic effects in humans and laboratory animals, depending on the specific compound and dosage used. In agreement with these findings, several studies in the last decade have indicated that the endocannabinoid system modulates neuronal activity in areas involved in defensive responses. The mechanisms of these effects, however, are still not clear. The present review summarizes recent data suggesting that they involve modulation of [...]
Lire la suite