Interaction between sterol regulatory element-binding proteins and liver receptor homolog-1 reciprocally suppresses their transcriptional activities.
In previous studies it was demonstrated that sterol regulatory element-binding proteins (SREBPs) are able to interact with one of the nuclear receptors, hepatocyte nuclear receptor (HNF)-4, and that this interaction regulates transcriptional activities of these proteins (Misawa, K., Horiba, T., Arimura, N., Hirano, Y., Inoue, J., Emoto, N., Shimano, H., Shimizu, M., and Sato, R. (2003) J. Biol. Chem. 278, 36176-36182; Yamamoto, T., Shimano, H., Nakagawa, Y., Ide, T., Yahagi, N., Matsuzaka, T., Nakakuki, M., Takahashi, A., Suzuki, H., Sone, H., Toyoshima, H., Sato, R., and Yamada, N. (2004) J. Biol. Chem. 279, 12027-12035). In an attempt to identify other nuclear receptor family members affecting the SREBP transcriptional activities, we found that the liver receptor homolog (LRH)-1 suppresses them. Several types of luciferase assays revealed that coexpression of these two proteins (LRH-1 and SREBP-1a, -1c, or -2) results in reciprocal inhibition of the transcriptional activity of each protein. It was confirmed that suppression in endogenous LRH-1 by small interference RNA stimulates the mRNA levels of certain SREBP target genes and that elevation in active SREBPs in the nucleus in response to cholesterol depletion suppresses the LRH-1 activity. In vitro/in vivo glutathione S-transferase pulldown experiments demonstrated that the basic helix-loop-helix-leucine zipper domain in SREBP-2 binds to the ligand-binding domain in LRH-1. Furthermore, we found that SREBP-2 interferes with the recruitment of a coactivator of LRH-1, the peroxisome proliferator-activated receptor gamma coactivator-1alpha, thereby leading to the inhibition of the LRH-1 transcriptional activity. These results clearly indicate that the interaction between SREBPs and LRH-1 exerts a suppressive influence on their target gene expression responsible for cholesterol and bile acid metabolism.
Kanayama
Tomohiko
T
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan.
Arito
Mitsumi
M
So
Kanako
K
Hachimura
Satoshi
S
Inoue
Jun
J
Sato
Ryuichiro
R
D001646:Bile / Q000378:metabolism; D045744:Cell Line, Tumor; D002784:Cholesterol / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000502:physiology*; D006360:Heat-Shock Proteins / Q000378:metabolism; D006801:Humans; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D011485:Protein Binding / Q000502:physiology; D017434:Protein Structure, Tertiary / Q000502:physiology; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics / Q000378:metabolism*; D050436:Regulatory Elements, Transcriptional / Q000502:physiology*; D051779:Sterol Regulatory Element Binding Proteins / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000502:physiology*
D004268:DNA-Binding Proteins; D006360:Heat-Shock Proteins; C082631:NR5A2 protein, human; C486497:PPARGC1A protein, human; D000071248:Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha; D018160:Receptors, Cytoplasmic and Nuclear; D051779:Sterol Regulatory Element Binding Proteins; D014157:Transcription Factors; D002784:Cholesterol