Cloning, characterization, and expression analysis of Toll-like receptor-7 cDNA from common carp, Cyprinus carpio L.
The Toll-like receptor 7 (TLR7) is activated by single strand RNA and RNA-like compounds (imidazoquinoline), and it induces interferon production. We identified and described carp TLR7 cDNA and its mRNA expression. The full-length cDNA of carp TLR7 gene is 3427 bp, encoding 1049 amino acids (AB553573). The similarities of carp TLR7 with zebrafish, rainbow trout, fugu, and human TLR7 were 89.6, 83.4, 80.6 and 74.6%, respectively, at the amino acid sequence level. Furthermore, the expression of TLR7 mRNA was investigated in normal tissues of carp by semi-quantitative RT-PCR analysis. Carp TLR7 expression was exhibited in healthy tissues (kidney, brain, spleen, skin, intestine, muscle, liver, gills and heart) and though the expression level in each tissue varied among healthy fish. Carp TLR7 expression was significantly increased in head kidney stimulated with TLR7 agonist, imiquimod, at 8, 24 and 48 h in vitro when compared to expression in the control group. Moreover, carp head kidney leukocytes produced elevated levels of pro-inflammatory and type 1 interferon cytokine mRNA in response to imiquimod stimulation.
Tanekhy
Mahmoud
M
Interdisciplinary Graduate School of Agriculture and Engineering, Department of Applied Biological Science, University of Miyazaki, Gakuen-kibanadai-nishi-1-1, Miyazaki 889-2192, Japan.
Kono
Tomoya
T
Sakai
Masahiro
M
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002347:Carps / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics*; D005880:Gills / Q000378:metabolism; D006801:Humans; D017686:Oncorhynchus mykiss / Q000235:genetics / Q000378:metabolism; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D023741:Takifugu / Q000235:genetics / Q000378:metabolism; D051199:Toll-Like Receptor 7 / Q000235:genetics* / Q000378:metabolism*; D015027:Zebrafish / Q000235:genetics / Q000378:metabolism
D018076:DNA, Complementary; D012333:RNA, Messenger; C495348:TLR7 protein, human; D051199:Toll-Like Receptor 7