title: Aryl hydrocarbon receptor, cell cycle regulation, toxicity, and tumorigenesis.
abstract: Most effects of exposure to halogenated and polycyclic aromatic hydrocarbons are mediated by the aryl hydrocarbon receptor (AHR). It has long been recognized that the AHR is a ligand-activated transcription factor that plays a central role in the induction of drug-metabolizing enzymes and hence in xenobiotic detoxification. Of late, it has become evident that outside this well-characterized role, the AHR also functions as a modulator of cellular signaling pathways. In this Prospect, we discuss the involvement of the AHR in pathways critical to cell cycle regulation, mitogen-activated protein kinase cascades, immediate-early gene induction, and the functions of the RB protein. Ultimately, the toxicity of AHR xenobiotic ligands may be intrinsically connected with the perturbation of these pathways and depend on the many critical signaling pathways and effectors with which the AHR itself interacts.
authors.affiliation: Department of Environmental Health and Center for Environmental Genetics, University of Cincinnati Medical Center, Cincinnati, Ohio 45267-0056, USA.
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Marlowe
authors.forename: Alvaro
authors.initials: A
authors.lastname: Puga
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D002453:Cell Cycle / Q000187:drug effects / Q000502:physiology*; D016147:Genes, Tumor Suppressor / Q000187:drug effects*; D006801:Humans; D008024:Ligands; D018336:Receptors, Aryl Hydrocarbon / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000502:physiology*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D015262:Xenobiotics / Q000494:pharmacology
chemical_list: D008024:Ligands; D018336:Receptors, Aryl Hydrocarbon; D015262:Xenobiotics