Journal
FISH & SHELLFISH IMMUNOLOGY
Volume 120, Issue -, Pages 23-30Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fsi.2021.11.012
Keywords
Blunt snout bream (Megalobrama amblycephala); Chromium picolinate; Heat stress; Immunity; Antioxidant
Funding
- National Key Research and Development Program of China [2018YFD0900400]
- Natural Science Foundation of Jiangsu Province [BK20200169]
- China Agriculture Research System of MOF
- China Agriculture Research System of MARA
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The study demonstrated that dietary chromium supplementation had no significant effect on the immune and antioxidant capacities of the fish under normal physiological conditions, but played an important role in relieving heat stress.
The present study assessed the role of dietary chromium (Cr) supplementation in relieving heat stress (HS) of juvenile blunt snout bream Megalobrama amblycephala. The supplemented Cr contents by chromium picolinate (Cr-Pic) was 0 mg/kg (control group), 0.4 mg/kg, 1.6 mg/kg and 12.0 mg/kg, respectively. The fish continued to be fed four diets at suitable temperatures (26 degrees C) for 2 weeks, and then the temperature was then heated up to 33 degrees C through thermo-regulated system. The results showed that Cr supplementation had no significant effect on the immune indices and antioxidant indices before HS (P 0.05), however, there was no significant variation of hepatic manganese superoxide dismutase (Mn-SOD) mRNA levels under different levels of supplementation (P 0.05). Significantly lower mRNA levels of hepatic pro-inflammatory cytokines observed in 0.4mg/kg-12.0 mg/kg Cr supplementation groups including tumour necrosis factor-alpha (TNF-alpha), interleukin 1 beta (IL-1 beta) and interleukin 8 (IL-8) (P < 0.05), and 0.4mg/kg-12.0 mg/kg Cr supplementation significantly improved the relative expressions of hepatic heat shock protein 70 (HSP70) and heat shock protein 90 (HSP90) (P < 0.05). The present study indicated that dietary Cr supplementation might have no significant effect on immune capacity and antioxidant capacity under normal physiological conditions, whereas it played an important role in relieving HS.
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