[No authors listed]
OBJECTIVE:To investigate the mitochondrial translocation of hypoxia inducible factor-3α (HIF-3α) under normoxia and hypoxia and its physiological and pathological meanings. METHODS:â After hypoxic (1%O2) or DMOG, CoCl2 treatments mimicking the hypoxic treatment, Western blot and immunofluorescence were used to examine the HIF-3α expression in mitochondria of HeLa and ACHN cells, respectively. â¡The protease sensitivity experiment was used to explore the sub-organelle localization of HIF-3α in mitochondria. â¢Western blot was used to examine mitochondrial HIF-3α in the normal mouse tissues and human liver carcinoma tissues. RESULTS:â In HeLa and ACHN cells, HIF-3α translocated to mitochondria under normoxia and hypoxia, and its mitochondrial expression was higher under hypoxia; â¡The protease sensitivity of HIF-3α was similar to proteins locating in the mitochondrial outer membrane; â¢Mitochondrial HIF-3α expressed in multiple normal mouse tissues; The expression of mitochondrial HIF-3α was higher in human liver carcinoma tissues than the normal and adjacent tissues. CONCLUSIONS:HIF-3α translocated to mitochondrial outer membrane under both normoxia and hypoxia, and hypoxia could up-regulated HIF-3α mitochondrial translocation. Meanwhile, the phenomenon may be involved in the process of liver carcinoma.
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