Newly identified [correction of dentified] members of the TNF receptor superfamily (mTNFRH1 and mTNFRH2) inhibit T-cell proliferation.
By searching an EST database, we identified two TNF receptor superfamily members (named mTNFRH1 and mTNFRH2). Amino acid sequences are highly conserved between the two receptors (78% identity). The chromosomal loci of mTnfrh1 and mTnfrh2 genes are found in distal chromosome 7 in the mouse. mTNFRH1 and mTNFRH2 do not contain the cytoplasmic domain, indicating that they might function as decoy receptors. Furthermore, an alternatively spliced form of mTNFRH1 was found which contains neither the transmembrane domain nor the cytoplasmic domain, thus presumably existing as a soluble form. Northern blot analysis showed that mTnfrh1 mRNA was negligibly expressed in tissues, while mTnfrh2 mRNA was strongly expressed in spleen, lung, liver, kidney, and testis. When the extracellular domains of mTNFRH1 and mTNFRH2 were expressed in bacteria, their molecular weight of extracellular region was approximately 15 kDa. Both of the soluble forms were effective in inhibiting T-cell proliferation stimulated by anti-CD3 monoclonal antibody. Our data suggest that mTNFRH1 and mTNFRH2 may be implicated in exerting a modulatory role in the immune response.
Kim
Juyang
J
The Immunomodulation Research Center, University of Ulsan, Ulsan 680-749, Korea.
La
Soojin
S
Kim
Byung-Sam
BS
Kwon
Byoung Se
BS
Kwon
Byungsuk
B
D017398:Alternative Splicing / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002455:Cell Division / Q000502:physiology*; D030561:Databases, Nucleic Acid; D015870:Gene Expression / Q000235:genetics; D051379:Mice; D008969:Molecular Sequence Data; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis*; D011994:Recombinant Proteins / Q000096:biosynthesis*; D013601:T-Lymphocytes / Q000166:cytology*
D018124:Receptors, Tumor Necrosis Factor; D011994:Recombinant Proteins; C469948:Tnfrh2 protein, mouse; C469947:Tnfrsf23 protein, mouse