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Background and Objectives:The function of hypoxia-inducible factors (HIFs) in the hypoxic environment is to orchestrate -dothelial growth factors (VEGF). It has been suggested that VEGF is involved in the pathogenesis of nasal polyp. The purpose of this study is to determine and correlate concentrations of HIF-1α and VEGF in nasal polyps. Materials and Method:Twenty-five nasal polyps were colected at the time of endoscopic sinus surgery. The production of HIF-1α and VEGF mesenger RNA (mRNA) was measured by reverse transcriptase polymerase chain reaction (RT-PCR) and HIF-1α and VEGF proteins were Results:The expresions of HIF-1, VEGF mRNA and proteins were detected in nasal polyps. RT-PCR demonstrated that the level of mRNA expression of HIF-1α and VEGF were 1.12± 0.33 and 1.1± 0.42, respectively. A positive correlation was observed betwen HIF-1α and VEGF mRNA (correlation coeficient [r]= 0.49, p<0.05). The imunohistochemical studies revealed that HIF-1α was predominantly expressed in surface epithelial cels, submucosal glan-landular epithelial cells, vascular endothelial cells, and inflamatory cels than in surface epithelial cels. The expressions of HIF-1α and VEGF proteins were 3.24± 1.80 and 3.52± 1.89, respectively. A positive corelation was observed betwen HIF-1α and VEGF proteins (r= 0.76, p<0.05). Conclusion:We sugest that HIF-1α has a role in inducing VEGF in nasal polyps, and hypoxia is an important factor in the growth of nasal polyps.

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