Abstract
The cell surface phenotype of immunoregulatory lymphocytes in bone marrow (BM) and peripheral blood (PB) in myelodysplastic syndrome (MDS), a stem cell disorder, was analyzed. Mononuclear cells from 25 patients with refractory anemia (RA) and nine with RA with an excess of blasts (RAEB) were characterized by two-color flow cytometry using various monoclonal antibodies. No significant change of CD3+, CD4+, and CD8+ cells in PB, but a decrease of the percent of positive cells for CD8+ among the total lymphocyte (%CD8+ +) was noticed in RA patients. On the other hand, in BM of RA patients, a decrease in the number of CD4+cells, but not CD8+ +cells, was noted. In RAEB patients, the absolute numbers of CD3+, CD4+, CD8+, and CD8+ +cells in BM were decreased; however, the ratio of these lymphocytes was not changed. No change was observed among the CD4 + subsets in PB of RA or RAEB patients. In BM, a decrease in percentage of CD4+ CD45RA+ (% CD4+ CD45RA+; naive cell) and increases in CD4+ CD45RO+ (% CD4+ CD45RO+; memory cell) and CD4+ CD29+ (%CD4+ CD29+; helper/inducer) among CD4+ cells were found in both RA and RAEB patients. Analysis of the CD8+ + subset showed an increased number of CD8+ + CD11a+ cells (activated CTL) in both BM and PB of RA patients, but not of RAEB patients. Furthermore, increments in CD56+ and CD16+ cells among CD3- cells (natural killer; NK cells) were seen in RA patients but not in RAEB patients. It remains unclear whether lymphocytes in MDS patients were involved in the abnormal (MDS) clones, but our results regarding the increments of CD8+ + CD11a+ and NK cells in RA patients suggest that the mechanism of immune surveillance against the abnormal MDS clones was activated in these RA patients, but not in RAEB patients. Further investigation is required to clarify the functions of these immunoregulatory lymphocytes in MDS patients.
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Iwase, O., Aizawa, S., Kuriyama, Y. et al. Analysis of bone marrow and peripheral blood immunoregulatory lymphocytes in patients with myelodysplastic syndrome. Ann Hematol 71, 293–299 (1995). https://doi.org/10.1007/BF01697982
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DOI: https://doi.org/10.1007/BF01697982