Table of Contents
Journal of Histology
Volume 2015, Article ID 686571, 6 pages
Research Article

The Ultrastructure of Secretory Cells of the Islets of Langerhans in South American Catfish Rhamdia quelen

1Dirección de Acuicultura Nación, Paseo Colon 982, Anexo Pesca, 1063 Buenos Aires, Argentina
2Centro Nacional de Desarrollo Acuícola (CENADAC), Paseo Colón 982, Anexo Pesca, 1063 Buenos Aires, Argentina
3Laboratorio de Imunologia e Patologia de Organismos Aquaticos, Instituto de Oceanografia, Universidade Federal De Rio Grande (FURG), Rua do Hotel 2, 96210-030 Rio Grande, RS, Brazil

Received 31 August 2014; Accepted 17 January 2015

Academic Editor: José R. Jaber

Copyright © 2015 Laura Luchini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The present work shows that a detailed description of the ultrastructure of the secretory cells of the South American catfish Rhamdia quelen pancreatic islets is presented. Evidence is offered to support the contention that the α-granules consist of a central and an outer portion of different electron densities and solubilities, that the δ-cells are most probably morphologically altered but viable α-cells, and that the β-granules possibly possess a repeating substructure and may therefore represent an intracellular crystalline storage form of insulin.