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Alcohol dependence: Psilocybin reduces relapsesactos metformin glipizide white triangles). (F) Schematic representation of lentiviral constructs. Lenti-mGluR2 expresses Grm2 and cop green fluorescent protein (copGFP) under control of elongation factor 1-alpha (EF1α) promoter. Lenti-control only expresses copGFP under EF1α control. ENV; Epstein-Barr virus derived vector, cPPT; central polypurine tract, WPRE; Woodchuck posttranscriptional regulatory element. (G) Injection placements are represented by black circles. Injection sites were verified within the infralimbic cortex from +3.2 to +2.2 mm anterior to bregma (85). (H) ASST performance of PD rats injected with either lenti-mGluR2 (n = 16, red squares) or lenti-control (n = 16, black squares) into the infralimbic cortex. In the EDS component of the task, no difference was observed between control and virally infected PD rats. However, in the IDS component, lenti-mGluR2–injected animals overall needed significantly fewer trials to criterion. IDS, intradimensional shift; EDS, extradimensional shift; *P < 0.05, **P < 0.01, and ***P < 0.001. Credit: DOI: 10.1126/sciadv.abh2399″ width=”800″ height=”530″>

Current research results uncover the unknown potential of psilocybin to restore molecular circuits in the brain and thus contribute to a reduction of relapses in alcohol dependence. This could lead to new therapeutic approaches.

Alcohol dependence is one of the most common neuropsychiatric diseases. In Germany, more than five million people are affected. The consequences are often severe physical and mental suffering and a high mortality rate. The average life expectancy of those affected is reduced by more than 22 years. Despite the severity of the disease, whose chronic course is characterized by frequently recurring relapses into excessive alcohol consumption and great suffering pressure for those affected, we still know little about the causal mechanisms in the brain.

Cortical mGluR2 deficit as a pathological molecular mechanism of altered behavior in addiction

Mental processes that control behavior, attention and emotions are known as executive functions. In many psychiatric diseases, the ability to control one’s own thoughts and actions and to regulate emotions are disturbed, for example in attention deficit hyperactivity disorder (ADHD), autism, schizophrenia, borderline syndrome and also in addiction.

In a multidisciplinary, international collaboration led by Dr. Marcus Meinhardt, Prof. Dr. Rainer Spanagel and Prof. Dr. Wolfgang Sommer (all at the Central Institute of Mental Health in Mannheim), the molecular mechanism of altered executive functions and increased relapses in alcohol dependence have been investigated. The research focuses on the role of the metabotropic glutamate receptor 2 (mGluR2). In the brain, this receptor works as an antenna for the neurotransmitter-glutamate and regulates its release in various brain areas. In their current work, which has now been published in the journal Science Advances, the research team shows a causal link between a reduced mGluR2 function within the brain region of the prefrontal cortex in alcohol-dependent rodents and an impaired executive control as well as craving for alcohol. mGluR2 activation has thus been identified as a potential therapeutic mechanism in alcohol dependence.

Psilocybin restores the production of mGluR2

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