Reactivity of new adhesion molecules on lymphocytes from patients with chronic graft versus host disease

Reaction patterns of the 7th Human Leukocyte Differentiation Antigen Workshop blind panel adhesion molecules were studied on CD3/CD4, CD3/CD8, CD3/TCRγδ double positive T cells from peripheral blood of patients with chronic graft versus host disease (n=8) and healthy controls (n=4). Reactivity of 14 adhesion antibodies was tested by threecolour immunophenotyping. The mean proportion of CD3+ T cells (69±19%), CD3/CD8++ (31±13%) and CD3/TCRγδ++ (4±2%) T sub-populations of patients were comparable with the healthy controls. However, the mean percentage of CD3/CD4++ T cell subset in patients (14±12%) proved to be significantly decreased in comparison with the normal control value (34±16%) presumably due to secondary immunodeficiency. The workshop antibodies proved to be reactive with three T cell subsets expressing the examined antigens. Based on the results of the adhesion molecule workshop new CD categories have been introduced: CD156b as a transmembrane protein, CD167a as an epithelial tyrosin kinase receptor, CD168 as a receptor for hyaluronan mediated motility (RHAMM) and CD171 as a co-stimulatory adhesion molecule. There were significant differences in the expression of the CD167a and CD156b antigens on the CD3/CD4++ subset between the samples of patients compared with the controls characterizing the CD4+ T lymphocyte subpopulation in chronic graft versus host disease