p300/CBP-associated factor (P/CAF) interacts with nuclear respiratory factor-1 to regulate the UDP-N-acetyl-alpha-d-galactosamine: polypeptide N-acetylgalactosaminyltransferase-3 gene.
We demonstrated recently that expression of the UDP- N -acetyl-alpha-D-galactosamine: polypeptide N -acetylgalactosaminyltrans-ferase-3 (GalNAc-T3) gene is restricted to epithelial glands [Nomoto, Izumi, Ise, Kato, Takano, Nagatani, Shibao, Ohta, Imamura, Kuwano, Matsuo, Yamada, Itoh and Kohno (1999) Cancer Res. 59, 6214-6222]. In the present study, we show that sodium butyrate treatment of human breast cancer MCF-7 cells transcriptionally activates the GalNAc-T3 gene. Transient transfection of plasmids containing a reporter gene under the control of GalNAc-T3 indicated that several transcriptional elements are involved in response to sodium butyrate, with the nuclear respiratory factor-1 (NRF-1)-binding motif located between -88 and -77nt being the most important. Incubation of a labelled probe encompassing the NRF-1-binding motif with a nuclear extract of sodium butyrate-treated MCF-7 cells yielded a higher level of specific DNA-protein complex versus controls. Flag-tagged NRF-1 expressed in MCF-7 cells can bind to the NRF-1-binding motif of the GalNAc-T3 promoter. Nuclear content of NRF-1 remained constant in MCF-7 cells treated with or without sodium butyrate. Moreover, NRF-1 interacts with and is acetylated by p300/CBP-associated factor (P/CAF). Acetylation of NRF-1 enhances DNA binding. Co-transfection of the GalNAc-T3 reporter plasmid with either NRF-1 or P/CAF expression plasmid resulted in the activation of the GalNAc-T3 promoter. These results indicate a correlation between acetylation of NRF-1 by P/CAF and the butyrate-induced expression of the GalNAc-T3 gene. Additionally, induced expression of P/CAF may be a component of the adenocarcinoma differentiation process.
Izumi
Hiroto
H
Department of Molecular Biology, School of Medicine, University of Occupational and Environmental Health Japan, Kitakyushu, Fukuoka 807-8555, Japan.
Ohta
Ryo
R
Nagatani
Gunji
G
Ise
Tomoko
T
Nakayama
Yoshifumi
Y
Nomoto
Minoru
M
Kohno
Kimitoshi
K
D000107:Acetylation; D000123:Acetyltransferases / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D002087:Butyrates / Q000494:pharmacology; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D051548:Histone Acetyltransferases; D006801:Humans; D017350:N-Acetylgalactosaminyltransferases / Q000235:genetics*; D051265:NF-E2-Related Factor 1; D051266:Nuclear Respiratory Factor 1; D051264:Nuclear Respiratory Factors; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors; D014407:Tumor Cells, Cultured; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor
D000123:Acetyltransferases; D002087:Butyrates; D018797:Cell Cycle Proteins; D017931:DNA Primers; D004268:DNA-Binding Proteins; D051548:Histone Acetyltransferases; D017350:N-Acetylgalactosaminyltransferases; D051265:NF-E2-Related Factor 1; D051266:Nuclear Respiratory Factor 1; D051264:Nuclear Respiratory Factors; D015534:Trans-Activators; D014157:Transcription Factors; D050880:p300-CBP Transcription Factors; D000099224:p300-CBP-Associated Factor; C495633:NRF1 protein, human