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Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Mol+Cells 1999 ; 9 (2): 172-8 Nephropedia Template TP
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Aromatic hydrocarbon nuclear translocator as a common component for the hypoxia- and dioxin-induced gene expression #MMPMID10340472
Park H
Mol Cells 1999[Apr]; 9 (2): 172-8 PMID10340472show ga
Aromatic hydrocarbon nuclear translocator (Arnt) is an ubiquitously expressed protein that contains basic helix-loop-helix (bHLH) and Per-AhR-Arnt-Sim (PAS) motifs. Other bHLH-PAS proteins, hypoxia-inducible factor-1alpha (HIF-1alpha) and aromatic hydrocarbon receptor (AhR) mediate hypoxia- and dioxin-signal pathway, respectively. Arnt has been identified as a heterodimerization partner for AhR. AhR/Arnt heterodimer binds the regulatory region of xenobiotic-induced genes and activates their transcription. Here, in vivo results provide evidence that Arnt is involved in not only xenobiotic- but also hypoxia-induced transcriptional activation. In hypoxic condition, Arnt dimerizes with HIF-1alpha to make HIF-1alpha/Arnt heterodimer which is able to bind hypoxia-responsive DNA elements. The HIF-1alpha/Arnt heterodimer functions as a transactivator for hypoxia-inducible genes. Given that the expression of Arnt is limited, HIF-1alpha may compete with AhR for recruiting Arnt as a heteromeric partner. Consistent with this idea, the results indicate that the hypoxic activation of HIF-1alpha reduces dioxin-induced AhR's function on the dioxin-responsive reporter gene and the endogenous gene.