Estudio histológico e histoquímica de las glándulas linguales de Egretta thula (aves: Ardeidae)

Authors

  • María Elena Samar
  • R. E. Avila
  • L. A. Olmedo
  • V. Porfirio
  • K. Grunberg

Abstract

In the present study it was investigated the histophysiology of the lingual salivary glands in white egret. Glands were processed by conventional histology (hematoxilin-eosin and Masson trichromic) and histochemical techniques including PAS, PAS/neuraminidase, alcian blue, toluidine blue and PNA lectin. The obtained results ha ve indicated the presence of numerous glands located anteroposterior and lateral !O the lingual cartila~e. In the anterior region, gla73ndular lo bes showed tubular structures formed by basophilic cuboidal cells.- In the posterior region a scarce number of mucous adenomers and intraepithelial glands were found. The histochemical reactions indicated the presence of glycoconjugate compounds in the glandular secretion. These glycoconjugates had a high number of terminal sialic acid residues because it was observed a decrease in PAS and alcian blue reactions after neuraminidase digestion. In addition, the affinity by PNA lectin was increased with enzymatic digestion. lt was also detected a strong alician.;philic and metachromatic sulphated groups. These findings showed that the glandular lingual secretion in these bires, present the same types of glycoconjugates as !hose described in mammals. In conclusion, this secretion could play a main role in food lubrication and non-inmune responses

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Published

2017-03-17

Issue

Section

ARTÍCULOS