Journal
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
Volume 235, Issue -, Pages 12-21Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpa.2019.04.023
Keywords
Nutrient sensors; AMPK; OGT; mRNA; Channel catfish; Nutritional status
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Funding
- Kansas IDeA Network of Biomedical Research Excellence Network (K-INBRE) - National Institute of General Medical Sciences of the National Institutes of Health [P20GM103418]
- K-INBRE Summer/semester research scholarship program
- K-INBRE Star undergraduate research fellowship program
- Balthazor Graduate Research Fellowship through the Fort Hays State University Department of Biological Sciences
- Graduate Scholarly Experience Grant through the Fort Hays State University Graduate School
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AMP-activated protein kinase (AMPK) is considered as the master cellular metabolism regulator that activates various proteins, including O-GlcNAc transferase (OGT). Physiological roles of AMPK and OGT, including the relationship between their mRNA expression and food intake, are poorly understood in channel catfish. This study examined the tissue distribution of AMPK and OGT mRNA and changes in their expression in response to changes in food intake in channel catfish. Expression of all AMPK subunit and OGT mRNA was detectable in the whole brain, liver, heart, spleen, white muscle, and kidney of channel catfish. The OGT mRNA was highly localized in the brain compared to other tissues. 28-day fasting increased hepatic expression of AMPK alpha 1, beta 1, and OGT mRNA while refeeding fish for 14 days after the 14-day fast decreased their expression to the level similar to that of fish that were fed daily. No changes were noted in the expression of muscle and brain AMPK mRNA or OGT mRNA by fasting and refeeding. Hepatic AMPK alpha 1, alpha 2 and beta 1 mRNA decreased in response to increased feeding frequency, whereas no changes in the expression of AMPK or OGT mRNA were noted in the brain or the muscle. Results of the current study indicated that the hepatic expression of AMPK and OGT mRNA appeared to be more sensitive to changes in food intake in channel catfish. However, further studies are needed to clearly demonstrate if food intake influences the expression of AMPK and OGT mRNA in various tissues, including the hypothalamus.
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