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Denatonium as a bitter taste receptor agonist damages jejunal epithelial cells of yellow-feathered chickens via inducing apoptosis

Published online by Cambridge University Press:  16 December 2019

J. Jiang
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
Z. Lv
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
L. Qi
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
H. Enayatullah
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
Q. Wei
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
D. Yu
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
F. Shi*
Affiliation:
College of Animal Science and Technology, Nanjing Agricultural University, No. 1 Weigang, Nanjing 210095, China
*
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Abstract

The sense of bitter taste is critical for chickens to acquire and select feeds. It is important to understand the roles and mechanisms of bitter taste transduction in chickens. Denatonium is extensively used as a bitter taste receptor agonist to activate bitter taste receptors in recent studies. The objective of this study was to investigate the physiological effects and the potential molecular mechanisms of dietary exposure to a strong bitter taste receptor agonist on the jejunal epithelial cells of yellow-feathered chickens. A total of 240 yellow-feathered chickens were divided into four treatments receiving a normal diet (Control), a low-dose denatonium treatment (Control + 5 mg/kg denatonium), a middle-dose denatonium treatment (Control + 20 mg/kg denatonium) and a high-dose denatonium treatment (Control + 100 mg/kg denatonium) for 56 days, respectively. The results showed that dietary denatonium reduced (P < 0.05) the growth performance of chickens. High-dose denatonium damaged the morphology of the jejunal epithelium and decreased (P < 0.05) the activities of Ca2+-ATPase, sucrase and maltase after 56 days of exposure. Meanwhile, high-dose denatonium increased (P < 0.05) mRNA expressions of bitter taste receptors, which resulted in enhanced apoptosis in jejunal epithelial cells after 56 days of exposure. Furthermore, middle-dose and high-dose denatonium exhibited increased (P < 0.05) mRNA level of claudin 2 and decreased (P < 0.05) mRNA level of occludin after 28 days of exposure. Only high-dose denatonium decreased (P < 0.05) mRNA level of occludin after 56 days of exposure. In conclusion, denatonium manifested deleterious effects on the jejunum of chickens in a dose–effect manner via damaging the morphology of the jejunal epithelium, and inducing apoptosis associated with bitter taste receptors. Our data suggest that bitter-tasting feed additives may have side effects on the growth and development of intestines in chickens.

Type
Research Article
Copyright
© The Animal Consortium 2019

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