NEUROGLIAL ORGANIZATION OF THE HYPOTHALAMO-NEUROHYPOPHYSIAL SYSTEM OF PSAMMOMYS OBESUS

Abstract

Event Abstract Back to Event NEUROGLIAL ORGANIZATION OF THE HYPOTHALAMO-NEUROHYPOPHYSIAL SYSTEM OF PSAMMOMYS OBESUS Saliha Ouali-Hassenaoui1*, Aicha Dekar1, Zohra Barka1 and Mounira Bendjelloul1 1 Faculty of Biological Sciences, USTHB, Algiers, Biology and physiology of organisms, Algeria Abstract The desert rodent Psammomys obesus lives under extreme conditions and overcome food and water shortage by modes of food and fluid intake. The hypothalamo-neurohypophysial system (HNS) is composed of magnocellular neurons that secrete vasopressin which is important in osmotic and cardiovascular regulation or oxytocin that intervenes essentially in the control of parturition and lactation. The axons of these neurons project to the neurohypophysis where the hormones are released into perivascular spaces. In the present study, we analysed the HNS of the diurnal desert rodent, Psammomys obesus. Using an immunocytochemestry and the electron microscopy, we revealed that the magnocellular neurons in this specie appear far more numerous than those in the rat, and vasopressinergic neurons clearly predominated. As dehydrated rat, in desert rodent, we also observed a coexistence of oxytocin and vasopressin in the same neurons. The HNS of Psammomys obesus showed neuro-glial organisation that characterized the HNS whose neuropeptides secretion is stimulated. Thus, as in the rat, during prolonged dehydration, there is a significant reduction in glial coverage of neuronal surfaces, and they are left directly juxtaposed and contacted by an increased number of synapses. Concurrently, in the neurohypophysis, there is an increased neurovascular contact zone. The neuro-glial remodeling in HNS must be mediated by cell-cell and cell-matrix interactions and the making and breaking of cell adhesion. Thus, it has been demonstrated that the expression of PSA-NCAM in the adult rat HNS is indispensable to its capacity for activity-dependent morphological neuronal-glial and synaptic plasticity. We showed that PSA-NCAM is strongly expressed in all portions of the SHN of Psammomys. Keywords: vasopressin, neuroglial interactions, Psammomys obesus, hypothalamo-neurohypophysial system, PSA-NCAM Conference: 4th Conference of the Mediterrarnean Neuroscience Society, Istanbul, Turkey, 30 Sep - 3 Oct, 2012. Presentation Type: Poster Presentation Topic: Abstracts Citation: Ouali-Hassenaoui S, Dekar A, Barka Z and Bendjelloul M (2013). NEUROGLIAL ORGANIZATION OF THE HYPOTHALAMO-NEUROHYPOPHYSIAL SYSTEM OF PSAMMOMYS OBESUS. Conference Abstract: 4th Conference of the Mediterrarnean Neuroscience Society. doi: 10.3389/conf.fnhum.2013.210.00055 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 24 Mar 2013; Published Online: 11 Apr 2013. * Correspondence: Prof. Saliha Ouali-Hassenaoui, Faculty of Biological Sciences, USTHB, Algiers, Biology and physiology of organisms, Algiers, Algeria, salihaouali@yahoo.fr Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Saliha Ouali-Hassenaoui Aicha Dekar Zohra Barka Mounira Bendjelloul Google Saliha Ouali-Hassenaoui Aicha Dekar Zohra Barka Mounira Bendjelloul Google Scholar Saliha Ouali-Hassenaoui Aicha Dekar Zohra Barka Mounira Bendjelloul PubMed Saliha Ouali-Hassenaoui Aicha Dekar Zohra Barka Mounira Bendjelloul Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.