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Short-term starvation and realimentation helps stave off Edwardsiella tarda infection in red sea bream (Pagrus major)


Short-term starvation and realimentation helps stave off Edwardsiella tarda infection in red sea bream (Pagrus major)



Comparative Biochemistry and Physiology. Part B Biochemistry and Molecular Biology 206: 42-53



ISSN/ISBN: 1096-4959

PMID: 28163184

DOI: 10.1016/j.cbpb.2017.01.009

Dietary regime modifications have been an integral part of health and healing practices throughout the animal kingdom. Thus, to assess the effects of periodic starvation and refeeding schedule on the physiological and immunological perturbations in Edwardsiella tarda infected red sea bream, we conducted a 20day experiment using 4 treatment groups, namely, pre-fed placebo (PFP); pre-starved placebo (PSP); pre-fed infected (PFI); and pre-starved infected (PSI), wherein a 5h E. tarda infection was done on the 11th day. In the present investigation, the pre-starved groups showed significant (P<0.05) alterations in the liver Hexokinase and Glucose-6-phosphatase activity. The pre-starved fish also exhibited significant (P<0.05) increment in the hepatosomatic index, along with increased hepatic glycogen content, in a time dependent fashion. The PPAR (peroxisome proliferator activated receptors)α transcription in the pre-starved group decreased significantly (P<0.05) by 10dai, while the PPARγ showcased a reverse pattern. The transcription of Hepcidin1 and Transferrin (iron homeostasis related genes), and Cathepsin D and Ubiquitin (programmed cell death related genes) portrayed a time responsive decrease and increase in PSI and PFI groups, respectively. Additionally, in comparison to the PFI group, the PSI fish demonstrated substantially reduced oxidative stress level. Fluorescent Immunohistochemistry showed significant (P<0.05) increase in p63 positive cells in the 10dai PFI fish in relation to the PSI group. Therefore, these findings provide new insight into the beneficial role of alternating starvation and refeeding schedule, preferably short-term starvation prior to an infection, in order to obtain better capability to battle against E. tarda infection in red sea bream.

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