title: Relationship between circadian oscillations of Rev-erbalpha expression and intracellular levels of its ligand, heme.
abstract: The nuclear hormone receptors, REV-ERBalpha [NR1D1] and REV-ERBbeta [NR1D1], were recently demonstrated to be receptors for the porphyrin, heme. Heme regulates the ability of these receptors to repress transcription of their target genes via modulation of the affinity of the receptor's ligand binding domain for the corepressor, NCoR. The REV-ERBs function as critical components of the mammalian clock and their expression oscillates in a circadian manner. Here, we show that in NIH3T3 cells intracellular heme levels also oscillate in a circadian fashion. These data are the first to show the temporal relationship of intracellular heme levels to the expression of its receptor, Rev-erbalpha, and suggest that the rapid oscillations in heme levels may an important component regulating REV-ERB transcriptional activity.
authors.affiliation: Nuclear Receptor Biology Laboratory, Pennington Biomedical Research Center, Louisiana State University System, 6400 Perkins Road, LA 70808, USA.
authors.forename: Pamela M
authors.initials: PM
authors.lastname: Rogers
authors.forename: Ling
authors.initials: L
authors.lastname: Ying
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Burris
mesh_terms: D056930:ARNTL Transcription Factors; D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins / Q000096:biosynthesis; D018797:Cell Cycle Proteins / Q000096:biosynthesis; D002940:Circadian Rhythm / Q000187:drug effects / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000378:metabolism*; D006418:Heme / Q000378:metabolism*; D006736:Horses; D051379:Mice; D041681:NIH 3T3 Cells; D009687:Nuclear Proteins / Q000096:biosynthesis; D056953:Nuclear Receptor Subfamily 1, Group D, Member 1; D056950:Period Circadian Proteins; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism*; D014157:Transcription Factors / Q000096:biosynthesis
chemical_list: D056930:ARNTL Transcription Factors; D051792:Basic Helix-Loop-Helix Proteins; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D006418:Heme; D009687:Nuclear Proteins; D056953:Nuclear Receptor Subfamily 1, Group D, Member 1; D056950:Period Circadian Proteins; D018160:Receptors, Cytoplasmic and Nuclear; D014157:Transcription Factors; C538961:Bmal1 protein, mouse; C498262:Nr1d1 protein, mouse; C513312:Per2 protein, mouse