Correlation Between Percentage of Immuncompetent CD4 + and CD4 + CD25 + Cells and Compatibility in the HLA System and Selected Parameters Assessing Transplanted Kidney Function

Background. Long-term kidney allograft survival is affected by many coexisting immunologic factors. Currently, only two basic immunologic parameters-HLA compatibility and panel reactive antibodies are routinely used in kidney transplantation management. At the same time, there is a great need for immunologic biomarkers that will help inrease understanding of kidney transplant immunology and improve clinical care of kidney recipients. T regulatory cells (Tregs) represent one of the major targets of this approach. The aim of this study was to investigate possible simple associations between Tregs count in recipients' blood and other routinely assessed or easily accessible laboratory parameters. Methods. Laboratory outcomes from medical files of transplant outpatient clinic in combination with flow cytometry analyses of particular immunocompetent cells populations were used. Flow cytometry was used to calculate Tregs recognized as TCD4(+)CD25(high). The Spearman rank correlation test was used to verify particular associations. Results. A negative correlation was found beween HLA compatibility and Tregs count as well as between platelets count and Tregs count. Conclusions. Whereas the negative correlation between Tregs and platelets counts may possibly mirror some recent findings in basic research, a negative correlation between HLA compatibility and Tregs points the direction of further research to factors triggering post-transplant immune tolerance.