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Biomedical subjects

D Kabelitz

Publications and source records attributed to D Kabelitz.

186 records · Page 11Linked to original sources
PubMed1981

Isolation of T lymphocytes in chronic lymphocytic leukaemia by depletion of mouse rosette-forming cells.

Separation of mouse rosette-forming cells (MRFC) was used as a technique to isolate T lymphocytes in patients with chronic lymphocytic leukaemia. The resulting interface fraction (non-MRFC) was highly enriched for sheep rosette-forming T cells (mean value 71.8% SRFC) as compared with unfractionated peripheral blood lymphocytes (mean value 18% SRFC). A higher degree of T-cell purity was achieved by this method than by the sheep rosette sedimentation technique in patients with leucocyte counts greater than 50 X 10(9)/l. Functional tests revealed that depletion of MRFC increased not only phytohaemagglutinin and mixed lymphocyte culture (MLC) reactivity but also the stimulatory capacity in the allogeneic MLC. In contrast, separation of MRFC in normal blood donors gave only a poor degree of separation and was not an effective means to isolate lymphocyte subpopulations.

Animals↗
PubMed1981

Appearance of anti-HLA-DR-reactive cells in normal and rheumatoid synovial tissue.

The reactivity of rabbit anti-HLA-DR antigen antibodies with cells in normal and rheumatoid synovial tissue was investigated by indirect immunofluorescence on frozen sections of tissue. The antibodies reacted with a significant proportion of the synovial lining cells of both normal and rheumatoid synovial tissue, with endothelial cells, and with a number of, most probably, migratory cells. After dispersion of cells from rheumatoid synovial tissue by digestion with collagenase and DNase, adherent cells of both a macrophage-like and a dendritic appearance reacted with the anti-HLA-DR antigen antibodies. The adherent cells were also found to be potent stimulators in the allogeneic MLR. In addition, it was found that a high percentage of T lymphocytes from both peripheral blood and synovial tissue of rheumatoid patients bound anti-HLA-DR antibodies. The present data suggest a role for synovial lining cells in HLA-D-locus-dependent events of importance in the pathogenesis of rheumatoid arthritis and other joint diseases and point to the need for further investigations on T lymphocytes derived from the site of inflammation in the study of rheumatoid arthritis.

Animals↗
PubMed1981

Anti-Ia-reactive cells in mycosis fungoides: a study of skin biopsies, single epidermal cells and circulating T lymphocytes.

Skin sections, epidermal cells in suspension and circulating T lymphocytes were investigated for the presence of Ia-like antigens in a group of patients with the cutaneous T-cell lymphoma mycosis fungoides (MF) and in healthy controls. Highly purified anti-Ia antibodies were used in indirect immunofluorescence, indirect peroxidase and peroxidase-antiperoxidase techniques. Allogeneic and autologous mixed leukocyte reaction tests with epidermal cells from MF lesions as stimulator cells were also performed. The majority of the dermal lympho-histiocytes and mononuclear cells in the epidermal Pautrier microabscesses expressed Ia-like antigens. So also did a greater proportion of circulating T lymphocytes than in the controls. In some MF patients a high percentage of single epidermal cells of non-lymphoid character also reacted with the antibodies. The possible significance of the present findings for the pathogenesis of MF is discussed.

Adult↗
PubMedDate not supplied

Tubular epithelial cells as accessory cells for superantigen-induced T cell activation.

In various inflammatory kidney diseases, tubular epithelial cells (TEC) express major histocompatibility complex class II antigens. To assess whether they might have the capacity to directly activate T cells, human TEC in culture were treated with gamma interferon to induce class II expression. TEC were then cocultivated with staphylococcus enterotoxin and cloned T cells or highly purified peripheral T cells. After 1-2 days, release of interleukin 2 and of gamma interferon was seen; after 3-5 days T cell proliferation occurred. The proliferation could be inhibited by antibodies to class II antigens or by antibodies to ICAM-1; the latter is also expressed on TEC in inflammatory processes and on TEC in culture as well. In conclusion, human TEC might function as accessory cells for T cell activation and might support T cell dependent immune response.

Antibodies↗