Expansion of immunoglobulin autoreactive T-helper cells in multiple myeloma
| Autor: | Anne Sundblad, Margareta Andersson, Masih Ostad, Astrid Gruber |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Immunology
Immunoglobulins CD8-Positive T-Lymphocytes Lymphocyte Activation Biochemistry Interferon-gamma Interleukin 21 Tetanus Toxin Humans Cytotoxic T cell IL-2 receptor Antibodies Blocking Antigen-presenting cell Cell Proliferation Interleukin 3 CD40 biology Interleukin-6 Histocompatibility Antigens Class II Interleukin-2 Receptor alpha Subunit Forkhead Transcription Factors Dendritic Cells T-Lymphocytes Helper-Inducer Cell Biology Hematology Natural killer T cell Molecular biology Coculture Techniques Phenotype biology.protein Interleukin 12 Multiple Myeloma |
| Zdroj: | Blood. 111:2725-2732 |
| ISSN: | 1528-0020 0006-4971 |
| Popis: | Activation and expansion of T helper (Th) cells followed by regulation of activation are essential to the generation of immune responses while limiting concomitant autoreactivity. In order to characterize T cells reactive towards myeloma-derived monoclonal immunoglobulin (mIg), an autologous coculture assay for single-cell analysis of mIg-responding cells was developed. When cultured with dendritic cells loaded with mIg, CD4+ Th cells from patients with progressing multiple myeloma (MM) showed a proliferative MHC class II–dependent response. CD8+ T-cell reactivity and Th1 activation were consistently low or absent, and Th2 and regulatory cytokines were expressed. The presence of such non-Th1 CD4+ T cells in peripheral blood was independent of treatment status, while the frequencies of responding cells varied between patients and reached the same order of magnitude as those measured for tetanus toxoid–specific Th memory cells. Furthermore, investigations of T-cell subpopulations indicated a possible regulatory role on the mIg responsiveness mediated by suppressive CD25highFOXP3+CD4+ T cells. It is proposed from the present results that a predominant in vivo activation of non-Th1 mIg-reactive CD4+ T cells constitute an Ig-dependent autoregulatory mechanism in human MM, with possible tumor growth supporting or permissive effects. |
| Databáze: | OpenAIRE |
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