Publication: The distribution of corticotropin-releasing factor immunoreactive neurons and nerve fibres in the brain of Gambusia affinis and Salmo trutta
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Date
1994
Authors
Coto-Montes, A. ; García-Fernández, J.M. ; Del Brío, M.A. ; Riera, P.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The study was carried out on the distribution
of neurons and fibres which contain the Corticotropin
releasing factor-like (CRF) immunoreactivity in the
encephalon of two species of teleosts, Gambusia affinis
and Salmo trutta. The peroxidase-antiperoxidase (PAP)
immunocytochemical technique was employed. The
present study has shown differences between both
species. In Gambusia affinis, positive neurons were
observed in the area ventralis telencephali pars lateralis
(VLT), in the nucleus praeopticus (NPO) and in the
nucleus lateralis tuberis (NLT). The immunoreactive
fibres were in the area ventralis telencephali, in the
preoptic hypophyseal tract and in the hypophysis.
In Salmo trutta the immunoreactive cells were seen in
the pars magnocellularis and pars parvocellularis of the
NPO and in cerebrospinal fluid (CSF) contacting
neurons of the NLT. The pattern of distribution of
immunoreactive fibres in Salmo trutta was different from
that in Gambusia affinis. In addition to the distribution of
perikarya in Gambusia affinis (in the VLT and in the
preoptic hypophyseal tract), fibres were also observed in
the tubero-hypophyseal tract and in the posterior
hypothalamus. The hypophysis of Salmo trutta also
presents an extensive labelling.
The interspecific differences shown in the present
study should be due to the different degree of evolution
in the two species studied and to other causes, such as
environmental ones.
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