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Cytochemical identification of endocrine thymus of chicken in relation to aging

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Author(s): Uma Kanta Mishra

Journal: Veterinary Research Forum
ISSN 2008-8140

Volume: 4;
Issue: 3;
Start page: 137;
Date: 2013;
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Keywords: Aging | Chicken | Endocrine cells | Serotonin cells | Thymus

ABSTRACT
ge related cytochemical changes of thymic endocrine cells were studied in 78 day oldchicks at fiveday interval to age of day 60 employing a panel of cytochemical stains.Methenamine silver revealed cell morphology including cell processes distinctly while diaminesilver revealed a stronger argentaffinity in these cells. The cells had greater affinityfor diaminesilver compared to methenamine silver (Argentaffin), followed by formaldehyde induced auto-fluorescence, argyrophilia, lead hematoxylin and HCl-toluidine. The chromaffin reaction was theweakest. Cytochemically, three different endocrine cell populations i.e. argentaffin cells,argyrophilic cells and amine precursor uptake and decarboxylation series (APUD)/chromaffincells, formed the resident population of thymic endocrine cells. Occurrence of numerousserotonin storing cells, moderately frequent APUD cells, and fewer chromaffin as well as mastcells suggests for a conspicuous reservoir of amine storing cells in thymus. Morphologicallyargentaffin cells were of four types i.e. the peripherally granulated spherical cells (Type-I),densely granulated oval cells (Type-II), pyramidal argentaffin cells (Type-III) and diffuselygranulated elongated cells (Type-IV). The type-II argentaffin cells were most frequent in themedulla followed by the type-I cells and the type-III cells. The type-IV cells wereleast infrequency. The age related changes in frequency of these cells arealsodiscussed.
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