Impact of Hypobaric Hypoxia on Rat Liver: Molecular and Biochemical Adaptations
TL;DR
Examination of the molecular and biochemical responses to hypoxia in the liver of rats subjected to low-pressure hypoxia at an altitude of 7620 meters over periods of 1, 3, and 7 days indicates a time-sensitive reaction to hypobaric hypoxia.
Abstract
A low-oxygen environment triggers the activation of mechanisms that sense oxygen and respond differently across various tissues, initiating adaptive pathways through (HIF-1α) hypoxia-inducible factor-1 alpha, which serves as a key regulator of hypoxia. This research focuses on examining the molecular and biochemical responses to hypoxia in the liver of rats subjected to low-pressure hypoxia at an altitude of 7620 meters over periods of 1, 3, and 7 days. After exposure to hypobaric hypoxia, liver tissues were removed to assess the redox status, overall antioxidant capacity, and molecular markers of adaptation, including HIF-1α, vascular endothelial growth factor (VEGF), and erythropoietin (EPO). The total antioxidant capacity in the liver showed a significant reduction on the 3rd and 7th days of exposure, while HIF-1α and its related factors displayed varying expression patterns in the liver. HIF-1α levels rose on the 1st and 7th days, and VEGF concentrations increased on the corresponding time-points of hypobaric hypoxia exposure. Additionally, erythropoietin played a role in the liver's adaptive response. In summary, low-pressure hypoxia activates various elements of the HIF-1α signalling pathway in the liver at different exposure times, indicating a time-sensitive reaction to hypobaric hypoxia.