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To explore the brain damage of SD rats under different time points of hypobaric hypoxia exposure.
A rat high-altitube cerebral edema (HACE) model was constructed by simulating an altitude of 6 000 m in a hypobaric hypoxia animal experimental chamber. Thirty-six SD male rats were randomly divided into the control group and the hypobaric hypoxia exposure 3, 7 and 14 d groups, with 9 rats in each group. Except for the control group, the rats in each group were continuously exposed to hypobaric hypoxia for 3, 7, and 14 d. At the end of the modeling period, serum was collected by blood sampling via the abdominal aorta, and brain tissue samples were taken. The wet-to-dry ratio (W/D) of brain tissue was calculated, and the levels of relevant oxidative enzymes in serum and brain tissue were measured. The expression levels of hypoxia-inducible factor-1α (HIF-1α) and aquaporin 4 (AQP4) mRNAs in brain tissue were detected by real-time fluorescence quantitative polymerase chain reaction.
The W/D of brain tissues in the control group and the group exposed to hypobaric hypoxia for 3, 7 and 14 d were 4.46±0.12, 4.98±0.16, 5.07±0.18 and 4.95±0.07; the superoxide dismutase contents were (111.86±2.45), (90.73±1.48), (79.64±2.56) and (55.33±1.45) U·g-1; the glutathione contents were (126.91±5.18), (125.26±1.53), (56.20±2.17) and (122.73±1.78) μg·mL-1; the malondialdehyde contents were (230.94±2.00), (362.65±3.28), (407.34±3.47) and (237.50±1.59) nmol·g-1; the relative expression levels of HIF-1α mRNA were 1.00±0, 2.99±0.49, 4.72±0.49 and 1.91±0.28; the relative expression levels of AQP4 mRNA were 1.00±0, 2.62±0.34, 8.38±0.84 and 5.27±0.42, respectively. Statistically significant differences were found between the above indexes in the 3, 7 and 14 d of hypobaric hypoxia exposure group compared with the control group (P<0.05, P<0.01).
Different time of hypobaric hypoxia exposure can up-regulate the expression of AQPs proteins in HACE rats and cause the disruption of the blood-brain barrier, and the HACE model constructed in the hypobaric hypoxia chamber with 6 000 m intervention for 7 d was more stable.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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