Screening of Hypoxia-Sensitive and Hypoxia-Tolerant Wistar Rats and Preliminary Exploration of Hypoxia Sensitivity in Their G1 Generation

Abstract

Objective By screening and passaging G0 generation Wistar rats, we obtained hypoxia-sensitive and hypoxia-tolerant G1 generation rats, and then the differences in hypoxia sensitivity among these rats were preliminarily explored. Methods 200 Wistar rats (half male and half female) were selected as G0 generation and placed in a controlled oxygen concentration system. The hypoxia tolerance time, which refers to the time from placement to near death, was recorded for the G0 generation rats at an oxygen volume fraction of 3%. 30 rats (half male and half female) with the shortest hypoxia tolerance time were selected for mating and passage to obtain G1 generation hypoxia-sensitive rats. Similarly, 30 rats (half male and half female) with the longest hypoxia tolerance time were selected for mating and passage to obtain G1 generation hypoxia-tolerant rats. An additional 24 standard Wistar rats were randomly divided into two groups: a control group and a model group, with 12 rats in each group (half male and half female). The control group was kept in a normoxic environment, while the model group, along with the G1 generation hypoxia-sensitive rats (G1 sensitive group) and G1 generation hypoxia-tolerant rats (G1 tolerant group), were placed in a hypobaric hypoxia chamber (simulating an altitude of 5 000 m). After 12 hours, various indicators, including blood gas, complete blood count, blood biochemistry, pathological sections, and hypoxia-related genes were detected or observed to compare the differences in hypoxia sensitivity among the 4 groups. Results Compared with the G0 generation standard rats, the hypoxia tolerance time of G1 generation rats was significantly prolonged (P0.05).ConclusionCompared with standard rats, G1 generation hypoxia-sensitive/tolerant rats exhibit good signs of hypoxia sensitivity/tolerance traits, but further screening and passage are still needed to purify them.

Keywords

• wistar rats
• hypoxia-sensitive
• hypoxia-tolerant
• blood gas analysis
• blood indicators