Author/Authors :
Shahsavar, Farhad Division of Transplant Immunology and Immunogenetics - Department of Immunology - Iran University of Medical Sciences - Tehran , Tajik, Nader Division of Transplant Immunology and Immunogenetics - Department of Immunology - Iran University of Medical Sciences - Tehran , Entezami, Kobra-Zinat Division of Transplant Immunology and Immunogenetics - Department of Immunology - Iran University of Medical Sciences - Tehran , Fallah Radjabzadeh, Masoomeh Division of Transplant Immunology and Immunogenetics - Department of Immunology - Iran University of Medical Sciences - Tehran , Asadifar, Behnam Division of Transplant Immunology and Immunogenetics - Department of Immunology - Iran University of Medical Sciences - Tehran , Alimoghaddam, Kamran Hematology-Oncology and Stem Cell Transplantation Research Center - Shariati Hospital - Tehran University of Medical Sciences - Tehran , Ostadali Dahaghi, Mohammadreza Hematology-Oncology and Stem Cell Transplantation Research Center - Shariati Hospital - Tehran University of Medical Sciences - Tehran , Jalali, Arash Hematology-Oncology and Stem Cell Transplantation Research Center - Shariati Hospital - Tehran University of Medical Sciences - Tehran , Ghashghaie, Andisheh Hematology-Oncology and Stem Cell Transplantation Research Center - Shariati Hospital - Tehran University of Medical Sciences - Tehran , Ghavamzadeh, Ardeshir Hematology-Oncology and Stem Cell Transplantation Research Center - Shariati Hospital - Tehran University of Medical Sciences - Tehran
Abstract :
Background: Interaction between killer cell immunoglobulin-like receptors (KIR) and human leukocyte antigen (HLA) class I molecules is important for regulation of natural killer (NK) cell function. Objective: The aim of this study was to investigate the impact of compound KIR-HLA genotype on susceptibility to acute leukemia. Methods: Cohorts of Iranian patients with acute myeloid leukemia (AML; n=40) and acute lymphoid leukemia (ALL; n=38) were genotyped for seventeen KIR genes and their three major HLA class I ligand groups (C1, C2, Bw4) by a combined polymerase chain reaction–sequence-specific primers (PCR-SSP) assay. The results were compared with those of 200 healthy control individuals. Results: We found a significantly decreased frequency of KIR2DS3 in AML patients compared to control group (12.5% vs. 38%, odds ratio=0.23, p=0.0018). Also, the KIR3DS1 was less common in AML group than controls (27.5% vs. 44.5%, p=0.0465, not significant after correction). Other analyses including KIR genotypes, distribution and balance of inhibitory and activating KIR+HLA combinations, and co-inheritance of activating KIR genes with inhibitory KIR+HLA pairs were not significantly different between leukemia patients and the control group. However, in AML patients a trend toward less activating and more inhibitory KIR-HLA state was observed. Interestingly, this situation was not found in ALL patients and inhibition enhancement through increase of HLA ligands and inhibi-tory combinations was the main feature in this group. Conclusion: Our findings may suggest a mechanism for escape of leukemic cells from NK cell immunity.
Keywords :
KIR , HLA , Genotype , Acute Leukemia
