Abstract:
:Rat CYP1A1 promoter-luciferase, transiently transfected wild-type and 4S PAH receptor (glycine N-methyl transferase, GNMT)-transformed Chinese hamster ovary (CHO) cells were exposed to benzo[a]pyrene and assayed for luciferase activity as an indicator of CYP1A1 promoter activity. CHO cells transformed with the rat 4S PAH receptor/GNMT expression vector had twice the induction level of luciferase activity with respect to wild-type CHO cells in concert with previously published reports that the 4S PAH receptor/GNMT mediates benzo[a]pyrene induction of CYP1A1 gene expression. Lysates of GNMT-transformed CHO cells and wild-type H4IIE rat hepatoma cells exposed to benzo[a]pyrene were immuno-precipitated with anti-GNMT antibodies, separated by SDS-polyacrylamide gel electrophoresis and transferred to PVDF membrane for Western blot analysis with anti-aryl hydrocarbon receptor nuclear translocator (ARNT, HIF-1β) antibodies. Results of this analysis indicated that the 4S PAH receptor/GNMT forms a hetero-oligomer (dimer?) with ARNT/HIF-1β which dissociates in the presence of B[a]P. These observations further indicate the role of GNMT (which has been shown to be multifunctional) and B[a]P in the induction of CYP1A1 and also a potential role of GNMT in the modulation of hypoxia inducible factor-1 function with respect to the HIF-1β subunit (ARNT).
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Sterling KMdoi
10.1002/jcb.23120subject
Has Abstractpub_date
2011-08-01 00:00:00pages
2015-8issue
8eissn
0730-2312issn
1097-4644journal_volume
112pub_type
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