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Evaluación de la expresión de citoquinas en tejido asociado a mucosa de trucha arcoiris (Oncorhynchus mykiss) y de la dorada (Sparus aurata)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dueso, Lluc Soliva |
| Copyright Year | 2017 |
| Abstract | Fish in aquaculture are permanently under the influence of various external stimuli, some of them can become stressors. Depending on their magnitude and duration, they may give rise to a physiological response with the aim of maintaining the body's homeostasis and thus preserving the welfare state. However, the response to stress can cause side effects in other types of mechanisms such as the immune response. The activation of physiological mechanisms during stress episodes releases different hormones, being cortisol the most relevant hormone in the response to stress in teleost. Cortisol is not only responsible to coordinate a series of processes aimed at generating a response to the external stimuli, but also influences the modulation of the immune system. In previous studies it has been reported that cortisol released against an acute stress response (short duration and high intensity stimuli) causes an immune-stimulating effect at systemic level. Currently, a growing interest has focused on the local response of mucosal-associated lymphoid tissue (MALT) due to its fundamental immunological role as a first line of defence against a stressor and / or pathogen. Nevertheless, the effect of cortisol on mucosal-associated lymphoid tissue (MALT) is currently unknown. For this reason, the aim of this study was to evaluate the effect of cortisol on the three main MALTs: skin (SALT), gills (GIALT) and intestine (GALT). For that reason, the tissues were incubated in vitro with a physiological concentration of cortisol simulating an acute stress situation (100 ng / 100 mg of tissue). The effect of cortisol at the local level was evaluated after 2h, 4h, and 24h of treatment by real-time PCR with the purpose of determining the modulation of different genes related to the pro-inflammatory immune response (interleukin 1β (IL- 1β) and 6, tumoral necrosis factor alpha (TNF-α) and cyclooxygenase (COX2), the anti-inflammatory immune response (interleukin 10, transforming growth factor beta) and gene expression related genes to stress response (glucocorticoid receptor (GR), 70 kDa heat shock protein). As a model of study, the sea bream (Sparus aurata) and rainbow trout (Oncorhynchus mykiss) were used to determine if the modulation of genes in response to the presence of cortisol is conserved between species. While, in sea bream skin no modulation was observed in the evaluated genes, an increase in the expression of TNF-α and GR was observed in trout at 4 hours of treatment. In the intestine, modulation of IL-1β and COX2 was observed at 24 hours of incubation in sea bream, but in trout only COX2 expression was recorded. In gills, no significant differences were observed in both species. In conclusion, our results indicate that the incubation of cortisol in MALT produces a stimulatory, but reduced, effect of the modulation of genes associated with the immune response and stress at the level of mucosal associated tissue in both species studied. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://upcommons.upc.edu/bitstream/handle/2117/109703/memoria.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
