Effects of hypoxia stress on liver function and gene expression in mice
Received date: 2022-06-01
Accepted date: 2022-08-17
Online published: 2022-09-21
As one of the most characteristic environmental factors on the Qinghai-Tibet Plateau, hypoxia has a profound impact on the adaptive evolution of plateau animals. Continued exposure to a hypoxic environment causes metabolic dysfunction of the body. In non-acclimated animals, long-term hypoxia exposure affects liver function, but there is still a lack of knowledge regarding its effect on offspring liver. In this study, adult mice were transferred to a high altitude hypoxic environment (altitude 3 220 m) for breeding. Mice reared under normoxic conditions were used as a control and the growth and live function of hypoxic-treated mice (hypoxic generation 0) and their offspring (hypoxic generation 1 ? generation 5) were evaluated.The results showed that long-term hypoxia exposure led to morphological and functional changes in the liver. Hepatocytes of hypoxia-exposed animals were swollen, caused by red blood cells infiltrating between hepatic cords. Specifically, the fatty degeneration appeared in the liver lobules of hypoxic generation 1 mice. Blood biochemical analyses showed that compared with the normoxia generation 0, the levels of alanine aminotransferase and aspartate aminotransferase in hypoxia generation 0 and hypoxia generation 1 increased significantly (P < 0.05).Albumin, globulin, total bilirubin and total cholesterol levels decreased in hypoxia generation 0 and increase in hypoxia generation 1 (P < 0.05). After fasting injection of glucose and insulin, the glucose tolerance and insulin sensitivity of mice in the hypoxic group were greatly reduced (P < 0.05). RNA-seq analysis of liver tissue from normoxic generation 0, hypoxic generation 0, and hypoxic generation 1 identified 459 differential expression genes (DEGs) in livers of hypoxia-exposed animals. These genes were significantly enriched in the MAPK signaling pathway, apoptosis, lipid metabolism, and endoplasmic reticulum pathway. This study demonstrated that hypoxic exposure has important effects on the liver in mice and the outcomes of these findings provide information to further elucidate the physiological and pathological changes induced by hypoxia at high altitudes.
Key words： Altitude hypoxia; Mice; Liver function; Liver transcriptome; Metabolize
Haiping TAO , Shuang LI , Gongxue JIA , Luyao ZHANG , Yougui FANG , Yongwei CHEN , Qien YANG . Effects of hypoxia stress on liver function and gene expression in mice[J]. ACTA THERIOLOGICA SINICA, 2022 , 42(5) : 590 -600 . DOI: 10.16829/j.slxb.150697
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