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Laminin Expression Pattern in the Histogenesis of the Dorsal Metencephalic Anlage

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Laminin Expression Pattern in the Histogenesis of the Dorsal Metencephalic Anlage International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2015): 78.96 | Impact Factor (2015): 6.391 Laminin Expression Pattern in the Histogenesis of the Dorsal Metencephalic Anlage Ahmed Hamza Abood1*, May Fadhil AL-Habib2, Anam Rasheed AL-Salihi3 1Department of Human Anatomy, University of Karbala, College of Medicine, Karbala, Iraq 2Department of Human Anatomy, Section of Histology& Embryology, University of AL-Nahrain,College of Medicine, Baghdad, Iraq 3Department of Human Anatomy, Section of Histology& Embryology, University of AL-Nahrain, College of Medicine, Baghdad, Iraq Abstract: Although laminin is the first glycoprotein to be expressed during embryogenesis of the CNS and it is involved in the list of the fifty proteins responsible for recessive cognitive disorders in human. But its importance in the cerebellar development has not received much attention. This study is an attempt to shed light on the functional role of the laminin in the development of one of the key structures in the central nervous system. That is the cerebellum in order to clarify its therapeutic potential in the treatment of these disorders. The mammalian animal model of this study was the rat and the embryonic period covered in it,was from the embryonic day 15 till birth. E-designation system was used to determine the relevant developmental stages of (62) rat embryos. Embryonic samples were collected and processed for paraffin block then sectioned. Polyclonal anti laminin Ab was used to demonstrate laminin reactivity. Quantification of laminin Ab reactivity done using Aperio Alogrithm software. The results of the present study revealed that the laminin was present at the pial basement membrane delineating the dorsal surface of the developing cerebellum and concentrated at the fissures. It illustrated that the spatiotemporal variation of the laminin expression is correlated with the main cellular dynamic events occurring in the dorsal part of the metencephalon. This work concluded that lamininisa navigation cue for migration, proliferation, differentiation, neurite outgrowth and cell process dynamics in particular during complex embryonic development taking place in the dorsal metencephalic anlage. Keywords: Dorsal metencephalic anlage, germinal trigone,external germinal layer, settlement of Purkinje cells layer. 1. Introduction granular cells, unipolarbrush cells and excitatory projection neurons) and several hindbrain neurons. These neurons after 4 Rhombencephalon is the primordium of the adult hindbrain their generation migrate to their final destination . As a which represents the region of the neuroaxis that surrounds result to that, major dynamichistogenetic events take place the fourth ventricle and its recesses. It is subdivided into in the DMA such as formation of the primitive cortex, two parts, the caudal part (myelencephalon) and the rostral external germinal layer, development of germinal trigone 5 part (metencephalon) by the pontine flexure. The and migration of the Purkinje cells . myelencephalon becomes the medulla oblongata, whereas the metencephalon becomes the pons and cerebellum. The Two types of migration; radial and tangential migration are cavity of the rhombencephalon becomes the fourth ventricle reported during the developing cerebellum in the early 6 and the central canal in the medulla. The basal plate; ventral development .In radial migration, migrating Purkinje cells portion of the rhombencephalon is continuous with spinal move outward in course, perpendicular to the ventricular cord caudally and with tegmentum of mesencephalon by a surface along the Bergmann cells whose fibers serve as a narrowed isthmus region rostrally. This continuity with the scaffolding for migrating cells (radial guided movement). caudal and rostral neuroaxis is absent dorsally. The alar Bergmann glia are specific radial glia located in the plate; the dorsal part of the rhombencephalon fails to fuse developing cerebellum in early developmentand play a medially in this region. Instead, a membrane, the medullary critical role in the migration of the cerebellar Purkinje cells 7 velum, part of which becomes the tela choroidea, spreads and granule cells .In contrast to the radial migration, over the fourth ventricle. This membrane initially forms a migrating PG cell in tangential migration move in trajectory, simple covering over the fourth ventricle and inter connects parallel to ventricular surface and independent to the glial the edges of the caudal and the rostral portions of the guidance away from the rhombic lip due to the combined 8 classical dorsal rhombencephalon. The bridgeheads are the effect of chemorepellent and chemoattractant cues .Several dorsal metencephalon rostrally and the pre-cerebellar extracellular matrix (ECM) components are essential to 9 neuroepithelium caudally1.The cerebellum develops “in” the control these dynamic events. Of these, is the laminin . dorsal metencephalon2.Different authors gave different delineations and morphological descriptionsto the roof plate Laminins include a group of the heteromeric ECM of the developing rhombencephalon such as; cerebellar glycoproteins consisting of α, β, and γ chains. They have anlageand dorsal metencephalic anlage (DMA) 3.During been implicated in many biological functions such as cells cerebellar development,two germinal zones appear in the differentiation, cells adhesion, cells migration and neurite 10 DMA; ventricular zone (VZ) and rhombic lip (RL).VZ is outgrowth . Laminins are essential for accurate cerebellar responsible for generations of all GABAergic cerebellar development and are vitalfor proper confirmation of neurons (deep nuclei neurons include nucleo-olivary meningeal basement membrane and for proper Bergmann 11 neurons, Purkinje cells and Golgi while RL is responsible glia development . Moreover, laminin deficiency causes a for generations of all glutamatergic cerebellar (include Volume 6 Issue 11, November 2017 www.ijsr.net Licensed Under Creative Commons Attribution CC BY Paper ID: ART20177863 DOI: 10.21275/ART20177863 237 International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2015): 78.96 | Impact Factor (2015): 6.391 decrease in the proliferation and migration of the granule material, depending on the previous scientific developmental cell progenitors, disorganization of Bergmann glia cells12. staging systems. This system uses the letter E referring to a specific developmental stage of the rat embryo followed by 2. Materials and Methods a numerical value which refers to embryonic day. Although this designation is very close to postcopulatory age, but it is 2.1 Experimental animals and housing not identical with it. In order to detect the exact chronological age of the embryos, several parameters are The present study was conducted on thirty albino mature included in this system such as postcopulatory age, CRL, female rats (Rattusrattusnorvegicusalbinus), they were Theiler’s stage and Carnegie’s stage. selected on basis of being obviously active and healthy, with 280 ± 30 g body weight. The female rats were housed Immunohistochemistry separately in a controlled room temperature (25±2o°C) on We used enzyme labeled antibodies technique for 12 hr light/dark cycle (lights on 7.00 am) with free access to visualization of laminin. Rabbit polyclonal anti-Laminin fresh trefoil diet and water ad libitum. They were placed in primary antibody (catalog # NB300-144) from Novus poly propylene cages with three animals per cage and were Biologicals® and the Super Sensitive IHC for Detection Kit permitted to acclimatize with the laboratory conditions three (catalog # orb219874) from Biorbyte® were used. The weeks. The isolated female was daily examined to segregate sections were processed at room temperature in a humidified those in estrus. chamber. Sectioning at 4μ were used and deparaffinized, Incubate tissue in appropriate pretreatment or digestive Mating the animals and timing of pregnancy enzyme for primary antibody, digestive enzyme use (pepsin The females at estrus time were put in separate cages for enzyme); and PBS/TBS wash 3 times for 2 minutes. Then breeding, each two females with one mature male and left incubate slide in Hydrogen Peroxide Blocking Reagent for overnight. The females were examined early in the next 10 minutes, PBS/TBS wash 3 times for 2 minutes. Apply morning between 8:00-9:00 am. In this work, the gestational Blocking Reagent and incubate for 5 minutes, PBS/TBS day zero was defined as the day when a copulatory plug wash 3 times for 2 minutes (May be omitted if primary and/or spermatozoa in a smear of the vaginal contents were antibodies are diluted in buffers containing normal goat observed in situ. The female was then transferred to a serum). Apply primary antibody and incubate according to separate cage and chronologically labeled for day post manufacturer's recommended protocol (overnight) coitum (dpc) which is a day that follows the day of incubation, PBS/TBS wash 3 times for 2 minutes. Apply copulatory plug observation. HRP Polymer and incubate for 10 minutes, PBS/TBS wash 3 times for 2 minutes.Add 30 ul (1 drop) DAB Chromogen to Retrieved of Embryosand tissue Preparation: 1 ml of DAB Substrate, mix by swirling and apply to tissue. At the appropriate post copulatory age, the pregnant females Incubate for about 3 - 5 minutes, PBS/TBS wash 3 times for were anaesthetized by deep anaesthesia with chloroform 2 minutes. Finally counter stain and cover
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