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Extreme hot weather is occurring more frequently due to global warming, posing a significant threat to species survival. Birds in particular are more likely to overheat in hot weather because they have a higher body temperature. This study used a heat stress model to investigate the antioxidant defense mechanisms and changes in fatty acid catabolism in Red-billed Leiothrix (Leiothrix lutea) to gain an understanding of how birds adapt to high temperatures. The birds were divided into five groups: a control group (30 ℃ for 0 days), 1 D group (40 ℃ for 1 day), 3 D group (40 ℃ for 3 days), 14 D group (40 ℃ for 14 days) and recovery group (40 ℃ for 14 days, then 30 ℃ for 14 days). Our results indicated that when Red-billed Leiothrix are subjected to heat stress, malondialdehyde (MDA) content in the liver significantly increased, as did the enzyme activities of catalase (CAT), glutathione–SH–peroxidase (GSH-PX) and total antioxidant capacity (T-AOC) in the liver. Furthermore, there was a significant increase in heat shock protein 70 (HSP70) expression in the liver, while avian uncoupling protein (avUCP) expression in muscle was significantly reduced. Additionally, there was a significant reduction in fatty acid catabolism enzyme activity such as 3-hydroxyacyl-CoAdehydrogenase (HOAD) activity in the heart, and carnitine palmitoyl transferase 1 (CPT-1) and citrate synthase (CS) activity in the heart and liver. Furthermore, fatty acid translocase (FAT/CD36) in the heart, heart-type fatty acid binding protein (H-FABP) and fatty acid binding protein (FABP-pm) in the liver and heart were also significantly decreased. These changes reverted after treatment, but not to the same level as the control group. Our results indicated that when Red-billed Leiothrix are exposed to heat stress their internal antioxidant defense system is activated to counteract the damage caused by high temperatures. However, even with high antioxidant levels, prolonged high temperature exposure still caused some degree of oxidative damage possibly requiring a longer recovery time. Additionally, Red-billed Leiothrix may be able to resist heat stress by reducing fatty acid transport and catabolism.


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Antioxidant defense mechanisms and fatty acid catabolism in Red-billed Leiothrix (Leiothrix lutea) exposed to high temperatures

Show Author's information Ruiping Xu1Canwen Yu1Liyao MaoMengchen JiangLuyao GaoMing Li( )Jinsong Liu( )
School of Life and Environmental Sciences, Wenzhou University, Wenzhou, 325035, China

1 Ruiping Xu and Canwen Yu contributed equally to this work.

Abstract

Extreme hot weather is occurring more frequently due to global warming, posing a significant threat to species survival. Birds in particular are more likely to overheat in hot weather because they have a higher body temperature. This study used a heat stress model to investigate the antioxidant defense mechanisms and changes in fatty acid catabolism in Red-billed Leiothrix (Leiothrix lutea) to gain an understanding of how birds adapt to high temperatures. The birds were divided into five groups: a control group (30 ℃ for 0 days), 1 D group (40 ℃ for 1 day), 3 D group (40 ℃ for 3 days), 14 D group (40 ℃ for 14 days) and recovery group (40 ℃ for 14 days, then 30 ℃ for 14 days). Our results indicated that when Red-billed Leiothrix are subjected to heat stress, malondialdehyde (MDA) content in the liver significantly increased, as did the enzyme activities of catalase (CAT), glutathione–SH–peroxidase (GSH-PX) and total antioxidant capacity (T-AOC) in the liver. Furthermore, there was a significant increase in heat shock protein 70 (HSP70) expression in the liver, while avian uncoupling protein (avUCP) expression in muscle was significantly reduced. Additionally, there was a significant reduction in fatty acid catabolism enzyme activity such as 3-hydroxyacyl-CoAdehydrogenase (HOAD) activity in the heart, and carnitine palmitoyl transferase 1 (CPT-1) and citrate synthase (CS) activity in the heart and liver. Furthermore, fatty acid translocase (FAT/CD36) in the heart, heart-type fatty acid binding protein (H-FABP) and fatty acid binding protein (FABP-pm) in the liver and heart were also significantly decreased. These changes reverted after treatment, but not to the same level as the control group. Our results indicated that when Red-billed Leiothrix are exposed to heat stress their internal antioxidant defense system is activated to counteract the damage caused by high temperatures. However, even with high antioxidant levels, prolonged high temperature exposure still caused some degree of oxidative damage possibly requiring a longer recovery time. Additionally, Red-billed Leiothrix may be able to resist heat stress by reducing fatty acid transport and catabolism.

Keywords: Heat stress, Antioxidant defense, Avian uncoupling proteins, Fatty acid translocase, Malondialdehyde, Red-billed Leiothrix

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Publication history

Received: 26 June 2021
Accepted: 06 December 2021
Published: 24 February 2022
Issue date: March 2022

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© 2022 The Authors.

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Acknowledgements

We would like to thank the reviewers for their important suggestions for the publication of this paper and for their guidance to improve the author's academic level. We also thank Dr Katrina Seelye nee Hale of Biological Science Editing, New Zealand for revising this manuscript. This study was financially supported by grants from the National Natural Science Foundation of China (No. 31971420; 32171497).

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This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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