title: Molecular study on chicken tumor necrosis factor receptor-II and tumor necrosis factor receptor-associated factor-5.
abstract: Tumor necrosis factor (TNF) receptor-associated factors (TRAFs) were identified as signal transducers for the tumor necrosis factor receptor (TNFR) superfamily. In this study, we cloned and characterized two genes that encode chicken TNFR-II and TRAF5. The initial cDNA fragments were obtained by suppressive subtractive hybridization (SSH) of chicken spleen cells with or without lipopolysaccharide stimulation (Salmonella typhimurium SL1181 (RE-mutant)). The results showed that chicken TNFR-II is 1518 bp in length with an open reading frame (ORF) of 1386 bp having 31% homology with human TNFR-II. Expression analysis of chicken TNFR-II revealed that it is highly expressed in the spleen and bursa of Fabricius. The chicken cell lines IN24, MSB1 and 1104B express TNFR-II abundantly. The time course analysis of expression in spleen, bursa of Fabricius and IN24 cell line showed that TNFR-II is maximally expressed at 6 h after stimulation in bursa of Fabricius and after 8 h stimulation in the IN24 cell line. With regard to TRAF5, the complete sequence was 1936 bp in length with an ORF of 1671 bp that showed 71.3% homology with human TRAF5. Expression analysis showed that, among the tissues examined, TRAF5 was strongly expressed in spleen and bursa of Fabricius, while among the cell lines examined, it was maximally expressed in IN24. Thus, both genes were expressed in the same tissues and cell line among examined materials. These results suggest that chicken TNFR-II may interact with TRAF5 adaptor protein to complete its signal transduction pathway.
authors.affiliation: Laboratory of Immunobiology, Department of Molecular and Applied Bioscience, Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan.
authors.forename: Sayed Abdalla
authors.initials: SA
authors.lastname: Abdalla
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Horiuchi
authors.forename: Shuichi
authors.initials: S
authors.lastname: Furusawa
authors.forename: Haruo
authors.initials: H
authors.lastname: Matsuda
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015703:Antigens, CD / Q000235:genetics*; D001483:Base Sequence; D002060:Bursa of Fabricius / Q000276:immunology; D002460:Cell Line; D002645:Chickens / Q000235:genetics* / Q000276:immunology*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D015870:Gene Expression; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D011506:Proteins / Q000235:genetics*; D018124:Receptors, Tumor Necrosis Factor / Q000235:genetics*; D047889:Receptors, Tumor Necrosis Factor, Type II; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D013154:Spleen / Q000276:immunology; D048015:TNF Receptor-Associated Factor 5; D014018:Tissue Distribution
chemical_list: D015703:Antigens, CD; D018076:DNA, Complementary; D011506:Proteins; D018124:Receptors, Tumor Necrosis Factor; D047889:Receptors, Tumor Necrosis Factor, Type II; D048015:TNF Receptor-Associated Factor 5