1
|
Nataf S, Davoust N, Ames RS, Barnum SR. Human T Cells Express the C5a Receptor and Are Chemoattracted to C5a. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.7.4018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The anaphylatoxin C5a is a potent mediator of inflammation that exerts a broad range of activity on cells of the myeloid lineage. In this study, we present the first evidence that human T cells express the C5a receptor (C5aR) and are chemotactic to C5a. Using FACS analysis, we found that the C5aR was expressed at a low basal level on unstimulated T cells and was strikingly up-regulated upon PHA stimulation in a time- and dose-dependent manner. CD3+ sorted T cells as well as Jurkat T cells were shown to express C5aR mRNA as assessed by RT-PCR. Moreover, semiquantitative RT-PCR analysis demonstrated that C5aR mRNA was down-regulated in purified T cells upon long-term PHA stimulation. To demonstrate that C5a was biologically active on T cells, we investigated the chemotactic activity of C5a and observed that purified CD3+ T cells are chemotactic to C5a at nanomolar concentrations. Finally, using a combination of in situ hybridization and immunohistochemistry, we showed that the T cells infiltrating the central nervous system during experimental allergic encephalomyelitis express the C5aR mRNA. In summary, these results suggest that C5a exerts direct effects on T cells and could be involved in the trafficking of T cells under physiological and pathological conditions, including inflammatory diseases of the central nervous system.
Collapse
Affiliation(s)
- Serge Nataf
- *Department of Microbiology, Division of Clinical Immunology and Rheumatology, University of Alabama, Birmingham, AL 35294; and
| | - Nathalie Davoust
- *Department of Microbiology, Division of Clinical Immunology and Rheumatology, University of Alabama, Birmingham, AL 35294; and
| | - Robert S. Ames
- †Department of Molecular Immunology, SmithKline Beecham Pharmaceuticals, King of Prussia, PA 19406
| | - Scott R. Barnum
- *Department of Microbiology, Division of Clinical Immunology and Rheumatology, University of Alabama, Birmingham, AL 35294; and
| |
Collapse
|