Neuroendocrine regulation of the stress response in adult zebrafish, Danio rerio

Progress in Neuro-psychopharmacology & Biological Psychiatry
Michail PavlidisAleka Tsalafouta

Abstract

The main objectives of this study were to investigate the dynamics of the cortisol stress response and the underlying molecular regulation in adult zebrafish exposed to acute and long-term stressors that differed in nature, duration and relative intensity. Fish showed a very rapid and prolonged increase in trunk cortisol concentrations, starting at around 15min and returning to basal levels at around 2h following exposure to acute stressors. In addition, acute stress affected significantly brain mRNA expression levels of several genes (corticotropin-releasing factor, crf; pro-opiomelanocortin, pomc; glucocorticoid receptor, gr; MR/GR ratio; prolactin, prl; hypocretin/orexin, hcrt; brain-derived neurotrophic factor, bdnf; c-fos). Exposure of fish to unpredictable relatively low-grade environmental and husbandry stressors (SP-1) did not affect the overall behaviour of fish, as well as trunk cortisol concentrations. Fish exposed to relatively higher-grade long-term stressors (SP-2) showed elevated cortisol levels as well as significant changes in most of gene transcripts. In particular, fish exposed to SP-2 showed statistically significant upregulation in brain gr, mr, prl and hcrt compared to SP-1 and control individuals. The hig...Continue Reading

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