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Lipopolysaccharide markedly changes glucose metabolism and mitochondrial function in the longissimus muscle of pigs

  • H. Sun (a1), Y. Huang (a1), C. Yin (a1), J. Guo (a1), R. Zhao (a1) and X. Yang (a1)...

Abstract

Most previous studies on the effects of lipopolysaccharide (LPS) in pigs focused on the body’s immune response, and few reports paid attention to body metabolism changes. To better understand the glucose metabolism changes in skeletal muscle following LPS challenge and to clarify the possible mechanism, 12 growing pigs were employed. Animals were treated with either 2 ml of saline or 15 µg/kg BW LPS, and samples were collected 6 h later. The glycolysis status and mitochondrial function in the longissimus dorsi (LD) muscle of pigs were analyzed. The results showed that serum lactate content and NADH content in LD muscle significantly increased compared with the control group. Most glycolysis-related genes expression, as well as hexokinase, pyruvate kinase and lactic dehydrogenase activity, in LD muscle was significantly higher compared with the control group. Mitochondrial complexes I and IV significantly increased, while mitochondrial ATP concentration markedly decreased. Significantly increased calcium content in the mitochondria was observed, and endoplasm reticulum (ER) stress has been demonstrated in the present study. The results showed that LPS treatment markedly changes glucose metabolism and mitochondrial function in the LD muscle of pigs, and increased calcium content induced by ER stress was possibly involved. The results provide new clues for clarifying metabolic diseases in muscle induced by LPS.

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Corresponding author

E-mail: yangxj@njau.edu.cn

References

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animal
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