open access

Vol 43, No 1 (2005)
Original paper
Submitted: 2011-12-19
Published online: 2011-08-19
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Morphological, histochemical and immunohistochemical study of the gill epithelium in the abyssal teleost fish Coelorhynchus coelorhynchus

Concetta Calabrò, Maria Pia Albanese, Eugenia Rita Lauriano, Silvestro Martella, Aurelio Licata
Folia Histochem Cytobiol 2005;43(1):51-56.

open access

Vol 43, No 1 (2005)
ORIGINAL PAPERS
Submitted: 2011-12-19
Published online: 2011-08-19

Abstract

Histochemical and immunohistochemical study was carried out on nitrinergic innervation and neuroendocrine system in the gill epithelium of the abyssal fish Coelorhynchus coelorhynchus. The results showed that nNOS-positive nerve fibers, originating from the branchial arch were present in the subepithelial tissue of branchial primary filament. nNOS-positive neuroendocrine cells were also present in the primary filaments and secondary lamellae. Numerous mucous cells in the gill epithelium were AB/PAS-positive, while sialic acid was absent as confirmed by neuraminidase reaction and WGA lectin histochemistry. The mucus compounds in abyssal teleost fish are different from those found in pelagic species, being related to their living conditions. In abyssal species, greater numbers of chloride and neuroendocrine cells are involved in the movement of water and electrolytes. Neuroendocrine cells possess oxygen receptors which mediate the cardiovascular and ventilatory response to oxygen deficiency, as reported in teleost species. Besides, NO contributes through nervous stimulation to the regulation of vascular tone and blood circulation in the gill.

Abstract

Histochemical and immunohistochemical study was carried out on nitrinergic innervation and neuroendocrine system in the gill epithelium of the abyssal fish Coelorhynchus coelorhynchus. The results showed that nNOS-positive nerve fibers, originating from the branchial arch were present in the subepithelial tissue of branchial primary filament. nNOS-positive neuroendocrine cells were also present in the primary filaments and secondary lamellae. Numerous mucous cells in the gill epithelium were AB/PAS-positive, while sialic acid was absent as confirmed by neuraminidase reaction and WGA lectin histochemistry. The mucus compounds in abyssal teleost fish are different from those found in pelagic species, being related to their living conditions. In abyssal species, greater numbers of chloride and neuroendocrine cells are involved in the movement of water and electrolytes. Neuroendocrine cells possess oxygen receptors which mediate the cardiovascular and ventilatory response to oxygen deficiency, as reported in teleost species. Besides, NO contributes through nervous stimulation to the regulation of vascular tone and blood circulation in the gill.
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Keywords

Gill; nNOS; Glycoconjugates; Lectins; Abyssal fish

About this article
Title

Morphological, histochemical and immunohistochemical study of the gill epithelium in the abyssal teleost fish Coelorhynchus coelorhynchus

Journal

Folia Histochemica et Cytobiologica

Issue

Vol 43, No 1 (2005)

Article type

Original paper

Pages

51-56

Published online

2011-08-19

Bibliographic record

Folia Histochem Cytobiol 2005;43(1):51-56.

Keywords

Gill
nNOS
Glycoconjugates
Lectins
Abyssal fish

Authors

Concetta Calabrò
Maria Pia Albanese
Eugenia Rita Lauriano
Silvestro Martella
Aurelio Licata

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