The O323 antibody reacts with human CD27 (TNFRSF7), a cell surface homodimer of 55 kDa subunits, which provides co-stimulatory signaling in support of the T cell (TCR) and B cell (BCR) receptors. By comparison with CD28, whose TCR co-stimulatory signal can trigger cell proliferation, CD27 signaling appears to promote cell survival and differentiation to effector / memory stages. Also in contrast with CD28, the CD27 receptor may be shed following interaction with its ligand CD70, which is typically expressed on activated dendritic cells, T cells and B cells. With respect to B cells, CD27 is considered to be a phenotypic marker for memory B cells. CD27 has been included within a group of phenotypic markers for identifying human B regulatory cells (Bregs), a cell type proposed to regulate CD4+ T cell proliferation and Foxp3 / CTLA-4 expression in Treg cells.
The O323 antibody may be used for analysis of CD27 expression on peripheral T cells, and is frequently used in combination with antibodies for IgD and IgM to distinguish na-ve vs. memory B cell populations. For identification of Breg cells, this antibody has been used in combination with antibodies for CD25, CD1d, IL-10 and TGF-beta (Kessel et al. 2012. Autoimm. Rev. 11(9): 670-677). The antibody is also reported for cross-reactivity with Baboon, Cynomolgus and Rhesus CD27.
Kroenke MA, Eto D, Locci M, Cho M, Davidson T, Haddad EK, and Crotty S. 2012. J. Immunol. 188: 3734-3744. (Flow cytometry)
Ruffell B, Au A, Rugo HS, Esserman LJ, Hwang ES, and Coussens LM. 2012. Proc. Natl. Acad. Sci. 109: 2796-2801. (Flow cytometry)
Strowig T, Tongvaux A, Rathinam C, Takizawa H, Borsotti C, Philbrick W, Eynon EE, Manz, MG, and Flavell RA. 2011. Proc. Natl. Acad. Sci. 108: 13218-13223. (Flow cytometry)
So NSY, Ostrowski MA and Gray-Owen SD. 2012. J. Immunol. 188: 4008-4022. (Flow cytometry)
Klatt NR, Vinton CL, Lynch RM, Canary LA, Ho J, Darrah PA, Estes JD, Seder RA, Moir SL, and Brenchley JM. 2011. Blood. 118: 5803-5812. (Cell sorting - Rhesus)
Ali Z, Yan L, Plagman N, Reichenberg A, Hintz M, Jomaa H, Villinger F, and Chen ZW. 2009. J. Immunol. 183: 5407-5417. (Flow cytometry - Rhesus)
Ali Z, Shao L, Halliday L, Reichenberg A, Hintz M, Jomaa H, and Chen ZW. 2007. J. Immunol. 8287-8296. (Flow cytometry - Cynomolgus)
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抗人球蛋白试验，又称Coombs’试验，是诊断自身免疫性溶血性贫血(AIHA)的重要依据。
正常人直接与间接试验均为阴性，Coombs’试验阴性有时并不能排除AIHA
