Characterization and gene expression of transcription factors, PU.1 and C/EBPα driving transcription from the tumor necrosis factor α promoter in Japanese flounder, Paralichthys olivaceus.
Both PU.1 and C/EBPα transcription factors play important roles in myeloid development and inflammatory response. These transcripts were cloned from the Japanese flounder (Paralichthys olivaceus) and were highly conserved with those of other vertebrates. PU.1 mRNA was mainly expressed in lymphoid tissues while C/EBPα mRNA was widely expressed in all tissues examined. Higher levels of PU.1 mRNA were expressed in the IgM(+) cells of both PBL and KL, while C/EBPα expression was higher only in the IgM(-) cells of KL. The expression of C/EBPα mRNA was induced only in KL stimulated with LPS. Interestingly, PU.1 mRNA expression was induced by Edwardsiella tarda, whereas the expression of C/EBPα mRNA was induced by Streptococcus iniae infection. Both PU.1 and C/EBPα drove transcription from the LPS-responsive region of the Japanese flounder TNFα gene, suggesting that both PU.1 and C/EBPα induced by bacterial infection are involved in inflammation mediated through TNFα expression.
Aquatic Biotechnology Center, College of Veterinary Medicine, Gyeongsang National University, 900 Gajwa-Dong, Jinju, Gyeongnam 660-701, South Korea.
Jun-ichi
J
Hikima
Maki
M
Ohtani
Hidehiro
H
Kondo
Ikuo
I
Hirono
Tae-Sung
TS
Jung
Takashi
T
Aoki
D000818:Animals; D001424:Bacterial Infections / Q000235:genetics / Q000276:immunology; D001483:Base Sequence; D022762:CCAAT-Enhancer-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D005393:Fish Diseases / Q000235:genetics / Q000276:immunology; D029941:Fish Proteins / Q000096:biosynthesis* / Q000235:genetics; D005432:Flounder / Q000235:genetics* / Q000276:immunology; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D011401:Promoter Regions, Genetic / Q000235:genetics; D011518:Proto-Oncogene Proteins / Q000096:biosynthesis* / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015534:Trans-Activators / Q000096:biosynthesis* / Q000235:genetics; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000235:genetics; D014777:Virus Diseases / Q000235:genetics / Q000276:immunology; D000099232:Proto-Oncogene Protein Spi-1
D022762:CCAAT-Enhancer-Binding Proteins; D029941:Fish Proteins; D011518:Proto-Oncogene Proteins; D015534:Trans-Activators; D014409:Tumor Necrosis Factor-alpha; D000099232:Proto-Oncogene Protein Spi-1; C083058:C-EPB transcription factor