Team News



Sort by


General informations
          Show the web article Link

Venue: Bordeaux School of Neuroscience

The normal aging process is associated with reduced performance on cognitive tasks that require one to quickly process or transform information to make a decision, including measures of speed of processing, executive cognitive function, working and relational memories. Structural and functional alterations in the brain correlate with these age-related cognitive changes, such as loss of synapses, and dysfunction of neuronal networks. It is crucial to develop new approaches that consider the whole neuroanatomical, endocrine, immunological, vascular and cellular changes impacting on cognition.

This 3-week course will cover the fundamentals of cognitive aging -including inter-individual differences, cognitive and brain reserve and risk factors- and highlight the newest functional imaging methods to study human brain function. The Faculty will share the state-of-the-art molecular, optical, computational, electrophysiological, behavioural and epidemiological approaches available for studying the aging brain in diverse model systems. The Students will learn the potential and limitations of these methods, through practical experience in a combination of lectures addressing aging in both humans and animal models and hands-on-projects. They will acquire sufficient practical experience to model, design and interpret experiments and brainstorm on novel technologies and hypotheses to explore the aging of the brain using more integrative and creative approaches.

Keynote speakers:
Hélène Amieva - University of Bordeaux
Adam Antebi - MPI for Biology of Ageing
Carol Barnes - University of Arizona
LucBuée-Centrede Recherche Jean-Pierre Aubert
Gwenaëlle Catheline - University of Bordeaux
Maria Llorens-Martin - Centro de Biologia
Molecular Severo Ochoa
Aline Marighetto - University of Bordeaux
Lars Nyberg - Umeå University
Laure Rondi-Reig - Sorbonne University
Yaakov Stern - Columbia University
Tony Wyss-Coray - Stanford University

Course director: Luísa Lopes
Co-directors: Cheryl Grady and Nora Abrous

Application deadline: 25 May 2020
Stipends are available

Registration
Fee : 3.500 € (includes tuition fee, accommodation and meals)

The CAJAL programme offers 4 stipends per course (waived registration fee, not including travel expenses). Please apply through the course online application form. In order to identify candidates in real need of a stipend, any grant applicant is encouraged to first request funds from their lab, institution or government.

Kindly note that if you benefited from a Cajal stipend in the past, you are no longer eligible to receive this kind of funding. However other types of funding (such as partial travel grants from sponsors) might be made available after the participants selection process, depending on the course.

For enquiries, please contact: info@cajal-training.org


Pièces jointes



The Bordeaux Neurocampus Graduate Program is partnering with the radio show "Des gens qui cherchent" on La Clé des Ondes to allow our student community to talk about their research work to a large audience.

Each week, André Rosevègue focuses on a new research topic with a dual objective: to demystify research by explaining and sharing cutting-edge scientific concepts with the general public and also to highlight the human side; the personal story, purpose and life path of the researcher who contributed to it.

First guest: Christopher Stevens
The first PhD student to participate was Christopher Stevens in the programme of 10 May 2021. This can be listened to online as a podcast on the Key to the Airwaves website.

Christopher Stevens is a member of the "Physiopathology of declarative memory" team directed by Aline Marighetto at the Neurocentre Magendie. His work focuses on the neural and cognitive basis of confirmation bias-induced interference in declarative memory performance.

Podcast link






The paper shows that (1) contextual amnesia, produced by the optogenetic inhibition of hippocampal activity (dCA1) during stress, causes PTSD-like hypermnesia in mice, and (2) the re-contextualization of traumatic memory by re-exposure to all trauma-related cues cures PTSD-like memory while promoting normal fear memory.
Article

Al Abed S., Ducourneau E.G., Bouarab C., Sellami A., Marighetto* A., and Desmedt* A.
Preventing and treating PTSD-like memory by trauma contextualization.
Nature Communications.
2020 Aug 24;11(1):4220.
doi: 10.1038/s41467-020-18002-w.

*co-last authorship





(A Study from Desmedt’s team in collaboration with PV Piazza & Lundbeck Lab.)
Comment

The paper shows (in collaboration with Lundbeck Laboratory) that acute administration of brexpiprazole, a new antipsychotic drug with pro-cognitive effects in rodents, (0.3 mg/kg) 7 days’ post-trauma persistently prevents the expression of PTSD-like memory in mice, while promoting normal fear memory. Specifically, It specifically blocks the emotional hypermnesia of PTSD while enhancing (with superior efficacy when compared to diazepam, prazosin and escitalopram) memory for the traumatic context, which is impaired in PTSD. Moreover, this treatment also normalizes most of the alterations in the hippocampal-amygdalar network activation associated with PTSD-like memory. These preclinical data indicate that brexpiprazole could represent a new pharmacological treatment of PTSD promoting the normalization of traumatic memory.
Reference

Ducourneau E.G., Guette C., Perrot D., Mondesir M., Mombereau C., Arnt J. Desmedt* A. and Piazza* P.V. Brexpiprazole blocks Posttraumatic stress disorder-like memory while promoting normal fear memory. Molecular Psychiatry. 2020 Aug 19.
*co-last authorship.

doi: 10.1038/s41380-020-0852-z
First author

Eva Ducourneau
Team Marighetto/Desmedt
(“Pathophysiology of declarative memory”)

Contact
Aline Desmedt
Team Marighetto/Desmedt
(“Pathophysiology of declarative memory”)







Le prochain congrès « Aging 2018 » se tiendra au domaine du Haut Carré à Talence du 26 au 28 septembre 2018. Il réunira les membres de la communauté neuroscientifique internationale autour d’un thème central : le vieillissement cognitif en absence de MA et l’existence de différences inter-individuelles dans l’atteinte mnésique au cours de l’âge.

Invitant : Bordeaux Neurocampus, Gwenaelle Catheline, Aline Marighetto, Nora Abrous
L’inscription est obligatoire pour toute personne participant ou assistant au Congrès. La soumission d’un abstract ne peut se faire qu’après inscription. Le colloque accueillera un maximum de 280 personnes. Les participants sont tenus d'être présents durant les 3 jours.






Beau succès pour le congrès Aging co-organisé par Nora Abrous, Aline Marighetto et Gwenaelle Catherine pour faire le point sur les dernières découvertes concernant le vieillissement cognitif.




Seminars
14/09/2018 11h30
Marloes Henckens

Meeting room: Amphi du Centre Broca

Dr. Marloes Henckens from Department of Cognitive Neuroscience, Donders Institute for Brain (Netherlands)'s lab will give a presentation entitled 'The neural signature of trauma susceptibility'

Invitant : Aline Desmedt, PhD , Maitre de Conférence au Neurocentre Magendie, Team Marighetto 'Pathophysiology of declarative memory'

Posttraumatic stress disorder (PTSD) is a psychiatric disorder which can develop after exposure to a traumatic event. Flashbacks, spontaneous recollection and recurrent nightmares of the trauma are amongst the most devastating symptoms of PTSD, through which patients continuously relive their trauma. Interestingly, only a small fraction (8-10%) of all trauma-exposed individuals eventually develops PTSD, whereas the rest is resilient and remains healthy. But how is the vulnerable brain different from the resilient one and when do these differences arise? Understanding the mechanisms behind these inter-individual differences could contribute to new clinical intervention strategies.
The use of a mouse model for PTSD allows us to study the mechanisms underlying relative resilience or susceptibility to PTSD in a longitudinal fashion, under controlled settings, while allowing for more invasive brain measurements. In this model, mice are first exposed to a traumatic event (i.e., severe unpredictable foot shock), followed by a trigger (i.e., mild predictable foot shock) in a different context one day later. Following a week of recovery, eventual development of PTSD-like symptomatology is assessed using a battery of behavioural tests to identify mice resilient and vulnerable to the trauma. Combining this model with functional MRI obtained both before and after trauma exposure, allowed us to study the development of a potential imbalance in neural network function as a consequence of trauma in the PTSD-vulnerable vs resilient brain, as well as the potential presence of neural abnormalities prior to trauma exposure in these animals. To study brain responses to the trauma itself, we used the so-called targeted recombination in active populations (TRAP) mice, in which the injection of tamoxifen opens up a temporal window in which all neurons expressing certain immediate early genes (reflecting neuronal activity), are permanently fluorescently labelled. We injected these animals with tamoxifen just prior to trauma exposure, and again assessed PTSD-symptoms later on. By re-exposing them to the traumatic context just before sacrifice and analysing trauma retrieval-induced neuronal activity by immunohistochemistry, we were moreover able to analyse the storage of the trauma memory into long-term memory. This allowed us to assess whether aberrant storage of the trauma memory could explain the emotional hypermnesia and contextual hypomnesia of the trauma that seem to characterize PTSD patients.




Les travaux de Catherine Benneteau sur les phytoestrogènes réalisés dans l'équipe d'Aline Marighetto ont fait l'objet d'un reportage diffusé dans "le Doc du dimanche" sur France 5. Retrouvez le passage consacré aux travaux magendiens à partie de 14'30".
https://www.france.tv/documentaires/societe/417745-le-doc-du-dimanche-soja-la-grande-invasion.html




Hottopic
31/01/2018 10h00
Christopher STEVENS from Marighetto's lab will give a presentation entitled "A behavioral mouse model for studying the neuronal underpinnings of confirmation bias"