Expression and functional role of CD23 on T cells.

Journal article

We have found that approximately 10%-15% of tonsil, but not peripheral blood, T cells express the CD23 antigen following activation with 12-O-tetradecanoylphorbol 13-acetate (TPA), phytohemagglutinin (PHA) or recombinant interleukin 4. The proliferative response of tonsil T cells is significantly increased when CD23 monoclonal antibodies (mAb) are present in the cultures. In contrast, no such proliferative augmentation is seen when peripheral blood T cells are cultured in this way. Supernatant (SN) of Epstein-Barr Virus-transformed B lymphoblastoid cell lines (EBVLCL), is found to have a similar co-stimulatory effect on the proliferation of tonsil T cells to that seen with CD23 mAb. This effect is greatly diminished by preclearing SN with CD23 mAb. Similarly, SN from a CD23+ L cell transfectant augments the proliferative response of tonsil T cells to both TPA and PHA. The CD23 molecule expressed by TPA-driven T cell blasts appears identical in size to the 45-kDa glycoprotein present on EBVLCL and activated B cells. In contrast, a 42-kDa molecule is observed when CD23 is precipitated from T cells activated with PHA. The results presented here demonstrate that CD23 is expressed on activated tonsil, but not peripheral blood T cells and plays a role, via the binding of CD23 mAb and CD23+ material, present in EBVLCL and CD23+ transfectant SN, in the regulation of T cell proliferation in response to mitogens such as PHA and TPA.

Authors: Armitage, R; Goff, L; Beverley, P

• Journal: European journal of immunology
• Volume: 19
• Issue: 1
• Pages: 31-35
• Publication date: 1989-01-01
• DOI: 10.1002/eji.1830190106
• EISSN: 1521-4141
• ISSN: 0014-2980
• Language: English
• Keywords: Receptors, Fc; Palatine Tonsil; Phytohemagglutinins; Antibodies, Monoclonal; Tetradecanoylphorbol Acetate; Humans; Adjuvants, Immunologic; T-Lymphocytes; Antigens, Differentiation, B-Lymphocyte; Solubility; Lymphocyte Activation; Receptors, IgE