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Inducible T cell antigen 4-1BB. Analysis of expression and function

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Authors
Kim, KK; Pollok, KE; Kim, YJ; Zhou, Z; Hurtado, J; Pickard, RT; Kwon, BS
Issue Date
1993
Publisher
American Association of Immunologists
Citation
J. Immunol. 150:771-781
Abstract
4-1BB is an inducible receptor-like protein expressed in both cytolytic and Th cells. Optimal induction of 4-1BB mRNA in T cells required both PMA and ionomycin stimulation, indicating that protein kinase C activation and increases in intracellular Ca2+ were required for its expression. 4-1BB was categorized as an early activation gene since the protein synthesis inhibitor, cycloheximide, blocked the induction of 4- 1BB mRNA. A rat mAb, 53A2, was generated against recombinant soluble 4- 1BB and was used to characterize this molecule. 4-1BB is a 30-kDa glycoprotein and appears to exist as both a monomer and a 55-kDa dimer on the cell surface of a T cell clone. The 4-1BB protein may be post- translationally modified since its predicted backbone is 25 kDa. FACS analysis indicated that 4-1BB was inducible and expressed on the cell surface of activated splenic T cells and thymocytes. Cross-linking of 4- 1BB on anti-CD3-stimulated T cells with 53A2 resulted in a dramatic enhancement of T cell proliferation. This suggests that 4-1BB may function as an accessory signaling molecule during T cell activation.
ISSN
0022-1767
Language
English
URI
https://hdl.handle.net/10371/69633
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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