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Distribution of gonadotropin‐releasing hormone immunoreactivity in the brain of Ichthyophis beddomei (amphibia: gymnophiona)
Author(s) -
Pinelli Claudia,
D'Aniello Biagio,
Fiorentino Maria,
Bhat Gopalakrishna,
Saidapur Srinivas K.,
Rastogi Rakesh K.
Publication year - 1997
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/(sici)1096-9861(19970728)384:2<283::aid-cne8>3.0.co;2-y
Subject(s) - biology , amphibian , forebrain , tegmentum , midbrain , terminal nerve , endocrinology , medicine , gonadotropin releasing hormone , median eminence , anatomy , hormone , central nervous system , luteinizing hormone , ecology
From a comparative viewpoint, we have investigated the presence and neuroanatomical distribution of gonadotropin‐releasing hormone (GnRH)‐immunoreactive material in the brain of a gymnophione amphibian, Ichthyophis beddomei . Immunocytochemical analysis of the adult brain and terminal nerves in both sexes shows the presence of neurons and fibers containing mammalian GnRH (mGnRH)‐ and chicken GnRH‐II (cGnRH‐II)‐like peptides. With respect to GnRH‐immunoreactive material, there are two distinct neuronal systems in the brain: one containing mGnRH, which is located in the forebrain and terminal nerve, and the other containing cGnRH‐II, which is restricted to the midbrain tegmentum. Basically, this distribution pattern parallels that of many species of anurans and a urodele. Whereas the presence of cGnRH‐II‐immunoreactive fibers in the dorsal pallium of I. beddomei is a feature in common with a urodele amphibian, the total absence of cGnRH‐II‐like material in the median eminence is unique to this species. It is suggested here that the distribution profile of GnRH‐like material within the brain and terminal nerve of I. beddomei represents a primitive pattern. J. Comp. Neurol. 384:283‐292, 1997. © 1997 Wiley‐Liss, Inc.