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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Seasonal plasticity of the pituitary pars intermedia of the one-humped camel (Camelus dromedarius)
Tissue and Cell, Volume 46, No. 1, Year 2014
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Description
The pituitary pars intermedia of Camelus dromedarius is well developed and completely surrounds the pars nervosa. Two major groups of cells are present: endocrine (ec) and glial-like cells (glc). The ec group is composed of three morphologically distinct cell types. Type I, or polyhedral light cells (LC-I) and type II, or polyhedral dark cells (DC-II), have secretory granules of heterogeneous electron density whose size ranges from 170 to 300. nm. Type III cells are elongated with homogeneous electron-dense secretory granules of 80-200. nm. The glc make up an organized network, form follicles in the centrolobular zones and are positive for vimentin and S-100β immunolabelling. The nerve fibres penetrating the lobe are numerous, and can be classified into two types according to the membrane bound vesicles found in their endings (ne). Ultrastructural quantitative analysis revealed significant variations in PI elements between winter and summer seasons (F=8.014, p=0.006). DC-II cells characterized by developed biosynthetic machinery and a large pool of secretory granules storage are increased with the ne in winter. However, LC-I cells showing frequent cytoplasmic degranulation are predominant with glc in summer. Thus, important cellular remodelling occurs in the dromedary PI that may depend upon, or perhaps anticipate, external living conditions. © 2013 Elsevier Ltd.
Authors & Co-Authors
Djazouli Alim, F. Z.
Algeria, Blida
Université Blida 1
Algeria, Kouba
École Normale Supérieure de Kouba
Lebaïli, Nemcha
Algeria, Kouba
École Normale Supérieure de Kouba
Mahy, N.
Spain, Barcelona
Universitat de Barcelona
Statistics
Citations: 3
Authors: 3
Affiliations: 3
Identifiers
Doi:
10.1016/j.tice.2013.11.001
ISSN:
00408166
e-ISSN:
15323072
Study Approach
Quantitative