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J Appl Physiol 89: 1937-1942, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 5, 1937-1942, November 2000

Expression of hypoxia-inducible factor-1alpha in the brain of rats during chronic hypoxia

Juan C. Chávez1, Faton Agani1, Paola Pichiule1, and Joseph C. LaManna1,2

Departments of 1 Anatomy and 2 Neurology, Case Western Reserve University, School of Medicine, Cleveland, Ohio 44106

Hypoxia-inducible factor-1 (HIF-1) is a transcription factor that regulates adaptive responses to the lack of oxygen in mammalian cells. HIF-1 consists of two proteins, HIF-1alpha and HIF-1beta . HIF-1alpha accumulates under hypoxic conditions, whereas HIF-1beta is constitutively expressed. HIF-1alpha and HIF-1beta expression were measured during adaptation to hypobaric hypoxia (0.5 atm) in rat cerebral cortex. Western blot analyses indicated that HIF-1alpha rapidly accumulated during the onset of hypoxia and did not fall for 14 days but fell to normal by 21 days despite the continuous low arterial oxygen tension. Immunostaining showed that neurons, astrocytes, ependymal cells, and possibly endothelial cells were the cell types expressing HIF-1alpha . Genes with hypoxia-responsive elements were activated under these conditions, as evidenced by elevated vascular endothelial growth factor and glucose transporter-1 mRNA levels. When 21-day-adapted rats were exposed to a more severe hypoxic challenge (8% oxygen), HIF-1alpha accumulated again. On the basis of these results, we speculate that the vascular remodeling and metabolic changes triggered during prolonged hypoxia are capable of restoring normal tissue oxygen levels.

brain hypoxic adaptation; hypoxia-inducible genes; brain capillary angiogenesis; brain tissue oxygen; vascular endothelial growth factor


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