Press releases

Mitochondria are essential to memory

Press release | 21 Nov 2016 - 12h10 | By INSERM PRESS OFFICE
Neurosciences, cognitives sciences, neurology and psychiatry

visuel-marsicano-newsroomMitochondria develop our memory by providing brain cells with energy (c) Charlie Padgett

Numerous studies have shown that using cannabis can lead to short- and long-term memory loss. These effects on memory may be related to the presence of specific receptors on several types of brain cells (glial cells as well as neurons). Inserm researchers led by Giovanni Marsicano (Neurocentre Magendie, U1215) have shown that these effects on memory are related to the presence of these same receptors on the mitochondria, the energy centre of the cell. This is the first time that the direct involvement of mitochondria in higher brain functions, such as learning and memory, has been shown. This work is published in the journal Nature.

 

Mitochondria are the energy centre of the animal cell. They are present within cells to produce the energy (in the form of ATP) needed for all biochemical processes. To do this, they use oxygen to transform nutrients into ATP. These functions are obviously necessary for the survival of all the cells in the body, but in the brain the impact of mitochondria goes beyond simple cell survival. Although the brain represents only 2% of the weight of the body, it actually consumes up to 25% of its energy. As a result, the energy balance of the brain is highly important for its functions, and is therefore tightly regulated. We know very well that chronic impairment of mitochondrial functions (e.g. in mitochondrial diseases) produces serious neurological and neuropsychiatric symptoms.

However, the direct functional involvement of mitochondria in higher brain functions, such as learning and memory, was not known before now.

In other terms, do we use the mitochondria in our brain when we are learning or remembering something?

This study, which is based on the discovery that the cannabinoid receptor CB1 is also present on the brain mitochondria (where it is known as mtCB1), reveals that this is indeed the case. With the help of innovative tools, the Inserm researchers showed that the active component of cannabis, THC (delta-9-tetrahydrocannabinol), causes amnesia in mice by activating mtCB1 receptors in the hippocampus.

“The impairment in memory induced by cannabis in the mouse requires activation of these hippocampal mtCB1 receptors,” explains Giovanni Marsicano. Conversely, “Genetically deleting them prevents this effect induced by the active drug in cannabis. We therefore think that mitochondria develop our memory by providing the brain cells with energy.”

This study is important not only because it reveals a new mechanism underlying the effects of cannabis on the memory, but also because it shows that mitochondrial activity is an integral part of the functions of the brain.

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Press release – Inserm press room Mitochondria are essential to memory Link : http://presse.inserm.fr/en/mitochondria-are-essential-to-memory/25757/
Medias
Researcher Contact

Giovanni Marsicano

Inserm Unit 1215 “Neurocentre Magendie” (Inserm/University of Bordeaux)

“Endocannabinoids and Neuroadaptation” group

Tel.: +33 (0)5 57 57 37 56

Mobile: +33 (0)6 75 23 35 36

E-mail: giovanni.marsicano@inserm.fr

Press Contact

presse@inserm.fr

Sources

A cannabinoid link between mitochondria and Memory

Etienne Hebert-Chatelain1,2,3,*, Tifany Desprez1,2,*, Román Serrat1,2,*, Luigi Bellocchio1,2,4,*, Edgar Soria-Gomez1,2, Arnau Busquets-Garcia1,2, Antonio Christian Pagano Zottola1,2, Anna Delamarre1,2, Astrid Cannich1,2, Peggy Vincent1,2, Marjorie Varilh1,2, Laurie M. Robin1,2, Geoffrey Terral1,2, Mª Dolores García-Fernández5,6, Michelangelo Colavita1,2,7, Wilfrid Mazier1,2, Filippo Drago7, Nagore Puente8,9, Leire Reguero8,9, Izaskun Elezgarai8,9, Jean-William Dupuy10, Daniela Cota1,2, Maria-Luz Lopez-Rodriguez11, Gabriel Barreda-Gómez5, Federico Massa1,2, Pedro Grandes8,9,12, Giovanni Bénard1,2,*, Giovanni Marsicano1,2,*,#

1INSERM U1215, NeuroCentre Magendie, Bordeaux, France.

2Université de Bordeaux, NeuroCentre Magendie, Bordeaux, France.

3Dept. of Biology, Université de Moncton, Moncton, New-Brunswick, Canada.

4Dept. of Biochemistry and Molecular Biology I, Complutense University, Madrid, Spain.

5Dept. of Research and Development, IMG Pharma Biotech S.L., Derio, Spain.

6Dept. of Pharmacology, Faculty of Medicine and Dentistry, University of the Basque Country UPV/EHU, Leioa, Spain.

7Dept. of Biomedical and Biotechnological Sciences, Section of Pharmacology, University of Catania, Catania, Italy.

8Dept. of Neurosciences, Faculty of Medicine and Nursing, University of the Basque Country UPV/EHU, Leioa, Spain.

9Achucarro Basque Center for Neuroscience, Bizkaia Science and Technology Park, Building 205, Zamudio, Spain.

10Université de Bordeaux, Centre Génomique Fonctionnelle, Plateforme Protéome, Bordeaux, France

11Department of Organic Chemistry, Complutense University, Madrid, Spain.

12Division of Medical Sciences, University of Victoria, Victoria, British Columbia, Canada

Nature 

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