The importance of the number of transplanted cells with dipeptidyl peptidase-4 expression on the haematopoietic recovery and lymphocyte reconstitution in patients with multiple myeloma after autologous haematopoietic stem-cell transplantation.

Autologous haematopoietic stem cell transplantation (AHSCT) remains recommended treatment in the first remission in multiple myeloma (MM). In earlier research it has been suggested that there is an influence of the expression of dipeptidyl peptidase-4 (CD26) on both the homing and lymphocyte reconstitution after AHSCT. The aim of the study is to investigate the influence of transplanted cells CD26+ on the haematopoietic recovery and lymphocyte reconstitution after AHSCT in MM. Forty eight patients with MM underwent AHSCT in our centre. Number of all CD26+ cells, CD26+ lymphocytes, CD26+ monocytes and CD26+ and CD34+ cells were measured in the harvested material. Number of lymphocyte's subpopulations (all lymphocytes CD3+, helpers, suppressors, natural killer (NK), cytotoxic NK and lymphocytes B) were measured in peripheral blood during regeneration after AHSCT. In both flow cytometry was used. On the basis of the analysis there was, as regards regeneration of haematopoietic cells after AHSCT, it was shown that a higher number of monocytes CD26+ improves the reconstitution of helper, suppressor and NK lymphocytes. A higher number of transplanted CD26+ lymphocytes accelerates the reconstitution of NK lymphocytes, whereas a higher number of all the cells CD26+ has a positive impact on the regeneration of cytotoxic NK lymphocytes.