title: Cold-shock induced changes in the interrenal tissue of a fresh water tropical teleost, Colisa fasciatus.
abstract: Interrenal tissue of Colisa is present in the head kidney as a collar around the right posterior cardinal vein. In the latter, a sphincter-like structure was observed. The adrenocortical cells are organized in irregularly grouped lobules, each lobule having a small lumen at its centre. There are usually 1-3 layers of such lobules around the vein. The chromaffin cells are interspersed between the adrenocortical cells and are readily identified because of their large size and almost transparent cytoplasm. Both the adrenocortical and chromaffin cells are irregular in shape with a single nucleus. Distinct hypertrophy of the adrenal cortical cells and their nuclei is observed at 171 minutes and 267 to 363 minutes following cold-shock (about +2 degrees C). Extrusion of the nucleoli through the nuclear membrane is noticed at 315 minutes. These changes indicate activation of the pituitary-interrenal axis subsequent to the stress of cold-shock. Size of the chromaffin cells and of their nuclei decreased at 75, 123 and 315 minutes post shock, suggesting release of catecholamines leading to the activation of the pituitary-interrenal axis.
mesh_terms: D000302:Adrenal Cortex / Q000166:cytology*; D000818:Animals; D002467:Cell Nucleus; D002838:Chromaffin System / Q000166:cytology; D003080:Cold Temperature / Q000009:adverse effects*; D004837:Epinephrine / Q000378:metabolism; D005260:Female; D005399:Fishes / Q000033:anatomy & histology*; D010913:Pituitary-Adrenal System / Q000502:physiology
chemical_list: D004837:Epinephrine