TY - JOUR T1 - Effect of Hypoxia on Proliferation and the Expression of the Genes HIF-1α and JMJD1A in Head and Neck Squamous Cell Carcinoma Cell Lines JF - Anticancer Research JO - Anticancer Res SP - 113 LP - 122 DO - 10.21873/anticanres.14756 VL - 41 IS - 1 AU - CHRISTIAN WILHELM AU - STEPHAN HACKENBERG AU - MAXIMILIAN BREGENZER AU - TILL MEYER AU - THOMAS GEHRKE AU - NORBERT KLEINSASSER AU - RUDOLF HAGEN AU - AGMAL SCHERZAD Y1 - 2021/01/01 UR - http://ar.iiarjournals.org/content/41/1/113.abstract N2 - Background/Aim: The aim of the study was to investigate the effects of hypoxia on proliferation and the expression of HIF-1α (hypoxia-inducible factor 1 alpha) and JMJD1A (jumonji domain 1A) in head and neck squamous cell carcinoma (HNSCC). Materials and Methods: FaDu and HLaC78 cells were incubated for 1-24 h in hypoxia and normoxia. Cell proliferation, mRNA and protein levels of HIF-1α and JMJD1A were quantified by counting, PCR and western blot. Results: Hypoxia led to a constant decrease in cell proliferation. Short hypoxia resulted in an increase in HIF-1α mRNA levels. This effect was reversed after longer incubation. The western blot for HIF-1α showed a maximum accumulation after 3-6 h of hypoxia. In FaDu cells, the concentration of JMJD1A reached a peak after 6 h and decreased thereafter, whereas in HLaC78 cells, it presented a second peak after 48 h. Conclusion: The transcription factors HIF-1α and JMJDA1 were confirmed as relevant hypoxia-dependent regulators of carcinogenesis in HNSCC. ER -