Article thumbnail

Development of posterior hypothalamic neurons enlightens a switch in the prosencephalic basic plan.

By Sophie Croizier, Clotilde Amiot, Xiaoping Chen, Françoise Presse, Jean-Louis Nahon, Jane Y Wu, Dominique Fellmann and Pierre-Yves Risold


International audienceIn rats and mice, ascending and descending axons from neurons producing melanin-concentrating hormone (MCH) reach the cerebral cortex and spinal cord. However, these ascending and descending projections originate from distinct sub-populations expressing or not "Cocaine-and-Amphetamine-Regulated-Transcript" (CART) peptide. Using a BrdU approach, MCH cell bodies are among the very first generated in the hypothalamus, within a longitudinal cell cord made of earliest delaminating neuroblasts in the diencephalon and extending from the chiasmatic region to the ventral midbrain. This region also specifically expresses the regulatory genes Sonic hedgehog (Shh) and Nkx2.2. First MCH axons run through the tractus postopticus (tpoc) which gathers pioneer axons from the cell cord and courses parallel to the Shh/Nkx2.2 expression domain. Subsequently generated MCH neurons and ascending MCH axons differentiate while neurogenesis and mantle layer differentiation are generalized in the prosencephalon, including telencephalon. Ascending MCH axons follow dopaminergic axons of the mesotelencephalic tract, both being an initial component of the medial forebrain bundle (mfb). Netrin1 and Slit2 proteins that are involved in the establishment of the tpoc and mfb, respectively attract or repulse MCH axons.We conclude that first generated MCH neurons develop in a diencephalic segment of a longitudinal Shh/Nkx2.2 domain. This region can be seen as a prosencephalic segment of a medial neurogenic column extending from the chiasmatic region through the ventral neural tube. However, as the telencephalon expends, it exerts a trophic action and the mfb expands, inducing a switch in the longitudinal axial organization of the prosencephalon

Topics: MESH: Animals, MESH: Axons, MESH: Intercellular Signaling Peptides and Proteins, MESH: Melanins, MESH: Mesencephalon, MESH: Mice, MESH: Models, Biological, MESH: Nerve Growth Factors, MESH: Nerve Tissue Proteins, MESH: Neurons, MESH: Phenotype, MESH: Pituitary Hormones, MESH: Bromodeoxyuridine, MESH: Rats, MESH: Receptors, Immunologic, MESH: Telencephalon, MESH: Time Factors, MESH: Tumor Suppressor Proteins, MESH: Cell Differentiation, MESH: Embryo, Mammalian, MESH: Gene Expression Regulation, Developmental, MESH: Green Fluorescent Proteins, MESH: Hedgehog Proteins, MESH: Hypothalamic Hormones, MESH: Hypothalamus, [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]
Publisher: 'Public Library of Science (PLoS)'
Year: 2011
DOI identifier: 10.1371/journal.pone.0028574
OAI identifier: oai:HAL:hal-00858520v1
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://hal.archives-ouvertes.... (external link)
  • https://hal.archives-ouvertes.... (external link)
  • https://hal.archives-ouvertes.... (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.