Immunomorphometric variations of sustentacular cells of the male viscacha adrenal medulla during the annual reproductive cycle. Effects of androgens and melatonin
| Autor: | Fabian Mohamed, Luis Ezequiel Gallol |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Male
0301 basic medicine MELATONIN endocrine system medicine.medical_specialty Histology medicine.drug_class SUSTENTACULAR CELLS VISCACHA Vimentin ADRENAL MEDULLA S100 protein Ciencias Biológicas Melatonin 03 medical and health sciences 0302 clinical medicine Internal medicine Parenchyma medicine Animals Testosterone biology Reproduction Cell Biology General Medicine Viscacha Bioquímica y Biología Molecular Androgen biology.organism_classification Immunohistochemistry ANDROGEN 030104 developmental biology medicine.anatomical_structure Endocrinology Adrenal Medulla REPRODUCTIVE CONDITIONS Androgens biology.protein Seasons Adrenal medulla CIENCIAS NATURALES Y EXACTAS 030217 neurology & neurosurgery medicine.drug |
| Zdroj: | Acta Histochemica. 120:363-372 |
| ISSN: | 0065-1281 |
| DOI: | 10.1016/j.acthis.2018.03.009 |
| Popis: | The adrenal medulla is crucial for the survival of species facing significant environmental changes. The parenchyma is composed mainly of chromaffin cells, ganglion cells and sustentacular cells (SC). The male viscacha exhibits seasonal variations of gonadal activity and other metabolic functions. The aim of this work was to investigate the influence of the reproductive conditions on the morphology of SC of this rodent. In addition, the effects of testosterone and melatonin on these cells were studied. Immunoexpression of S100 protein, GFAP and vimentin were analyzed. Furthermore, the distribution of adrenergic and noradrenergic chromaffin cells subpopulations was studied for the first time in this species. SC present long cytoplasmic processes in contact with chromaffin cells, probably generating an intraglandular communication network. Significant differences (p < 0.05) in the %IA (percentage of immunopositive area) for the S100 protein were observed according to winter (4.21 ± 0.34) and summer (3.51 ± 0.15) values. In castrated animals, the %IA (6.05 ± 0.35) was significantly higher in relation to intact animals (3.95 ± 0.40). In melatonin-treated animals the %IA (3.62 ± 0.23) was significantly higher compared to control animals (2.65 ± 0.26). GFAP immunoexpression was negative and no noradrenergic chromaffin cells were detected suggesting an adrenergic phenotype predominance. Vimentin was observed in SC, endothelial cells and connective tissue. Results indicate that SC exhibit variations along the annual reproductive cycle, along with castration and the melatonin administration. Our results suggest that in this rodent SC are not only support elements, but also participate in the modulation of the activity of the adrenal medulla; probably through paracrine effects. Fil: Gallol, Luis Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Bioquímica y Ciencias Biológicas; Argentina Fil: Mohamed, Fabian Heber. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Departamento de Bioquímica y Ciencias Biológicas; Argentina |
| Databáze: | OpenAIRE |
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