Universidad Complutense de Madrid
E-Prints Complutense

Organization of the orexin/hypocretin system in the brain of two basal actinopterygian fishes, the cladistians Polypterus senegalus and Erpetoichthys calabaricus

Impacto

Downloads

Downloads per month over past year

López Redondo, Jesús María and Sanz-Morello, Berta and González Gallegos, Agustín (2014) Organization of the orexin/hypocretin system in the brain of two basal actinopterygian fishes, the cladistians Polypterus senegalus and Erpetoichthys calabaricus. Peptides, 61 . pp. 23-37. ISSN 0196-9781, ESSN: 1873-5169

[img] PDF
Restringido a Repository staff only

6MB

Official URL: https://www.sciencedirect.com/science/article/pii/S019697811400254X



Abstract

Cladistians are primitive actinopterygian fishes mostly neglected in neuroanatomical studies. In the present study, the detailed neuroanatomical distribution of orexin (hypocretin)-like immunoreactive (OX-ir) cell bodies and fibers was analyzed in the brain of two species representative of the two extant genera of cladistians. Antibodies against mammalian orexin-A and orexin-B peptides were used. Simultaneous detection of orexins with neuropeptide Y (NPY), tyrosine hydroxylase (TH), and serotonin (5-HT) was used to establish accurately the topography of the orexin system and to evaluate the possible interactions with NPY and monoaminergic systems. A largely common pattern of OX-ir distribution in the two cladistian species was observed. Most OX-ir cells were located in the suprachiasmatic nucleus and tuberal hypothalamus, whereas scarce cells were observed in the posterior tubercle. In addition, a population of OX-ir cells was found in the preoptic area only in Polypterus and some cells also contained TH. The observed widespread distribution of OX-ir fibers was especially abundant in the retrobulbar area, subpallial areas, preoptic area, suprachiasmatic nucleus, tuberal hypothalamic area, prethalamus, thalamus, pretectum, optic tectum, and tegmentum. Low innervation was found in relation to monoaminergic cell groups, whereas a high NPY innervation was observed in all OX-ir cell groups. These relationships would represent the anatomical substrate for the functional interdependence between these systems. The organization of the orexin system in cladistians revealed a pattern largely consistent with those reported for all studied groups of vertebrates, suggesting that the primitive organization of this peptidergic system occurred in the common ancestor of gnathostome vertebrates.


Item Type:Article
Uncontrolled Keywords:Orexins; Tyrosine; Hydroxylase; Serotonin; Immunohistochemistry; Hypothalamus; Polypteridae; Brain evolution
Subjects:Medical sciences > Biology > Cytology
Medical sciences > Biology > Biochemistry
Medical sciences > Biology > Neurosciences
Medical sciences > Biology > Fishes
ID Code:47732
Deposited On:25 May 2018 08:22
Last Modified:25 May 2018 08:47

Origin of downloads

Repository Staff Only: item control page