D
Denis Becquet
Researcher at Aix-Marseille University
Publications - 50
Citations - 1201
Denis Becquet is an academic researcher from Aix-Marseille University. The author has contributed to research in topics: Suprachiasmatic nucleus & Circadian rhythm. The author has an hindex of 20, co-authored 50 publications receiving 1128 citations. Previous affiliations of Denis Becquet include Centre national de la recherche scientifique & French Institute of Health and Medical Research.
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Direct evidence for the link between monoaminergic descending pathways and motor activity. I. A study with microdialysis probes implanted in the ventral funiculus of the spinal cord
TL;DR: Results demonstrate that the implantation of a microdialysis probe in the ventral funiculus, close to a potential target of monoaminergic projections, is a suitable technique for the collection of neuromediators released during spontaneous running.
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Ultrastructural plasticity in the rat suprachiasmatic nucleus. Possible involvement in clock entrainment.
Denis Becquet,Clémence Girardet,Fabienne Guillaumond,Anne-Marie François-Bellan,Olivier Bosler,Olivier Bosler +5 more
TL;DR: Evidence is provided that the SCN undergoes rhythmic ultrastructural rearrangements over the 24‐h cycle characterized by day/night changes of the glial, axon terminal, and/or somato‐dendritic coverage of neurons expressing arginine vasopressin (AVP) or vasoactive intestinal peptide (VIP), the two main sources of SCN efferents.
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Influence of the corticosterone rhythm on photic entrainment of locomotor activity in rats.
Dominique Sage,Julien Ganem,Fabienne Guillaumond,Geneviéve Laforge-Anglade,Anne-Marie François-Bellan,Olivier Bosler,Denis Becquet +6 more
TL;DR: It is proposed that, under stable lighting conditions, circulating glucocorticoids contribute to stabilizing activity rhythms by reinforcing resistance of the circadian timing system to variations of the photoperiod.
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In vivo evidence for an inhibitory glutamatergic control of serotonin release in the cat caudate nucleus: involvement of GABA neurons.
TL;DR: The local effect of L-glutamic acid on the release of serotonin continuously synthesized from [3H]tryptophan was examined in the caudate nucleus of unanaesthetized cats implanted with push-pull cannula, suggesting that the glutamatergic receptors involved were not located directly on serotonin nerve terminals.
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Impairment of serotoninergic transmission is followed by adaptive changes in 5HT1B binding sites in the rat suprachiasmatic nucleus
C. Manrique,Anne-Marie François-Bellan,Louis Segu,Denis Becquet,Micheline Hery,Maxime Faudon,Francis Hery +6 more
TL;DR: Results indicate that 5-HT1B receptor density in the SCN was inversely correlated with5-HT levels, and up-regulation was shown to be reversible after restoration of 5- HT synthesis with L-5-hydroxytryptophan.