Title:The Influence of KIR Gene Polymorphisms and KIR-ligand Binding on
Outcomes in Hematologic Malignancies following Haploidentical Stem Cell
Transplantation: A Comprehensive Review
Volume: 23
Issue: 11
Author(s): Tahereh Bakhtiari, Mohammad Ahmadvand, Arash Salmaninejad, Afshin Ghaderi, Marjan Yaghmaie, Alireza Sadeghi, Seied Asadollah Mousavi, Tahereh Rostami*Mazdak Ganjalikhani-Hakemi*
Affiliation:
- Cell Therapy
and Hematopoietic Stem Cell Transplantation Research Center, Research Institute for Oncology, Hematology, and Cell
Therapy, Tehran University of Medical Sciences, Tehran, Iran
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
- Department of Immunology, Faculty of Medicine, Yeditepe University, Istanbul, Turkey
Keywords:
NK cell alloreactivity, KIR gene polymorphisms, KIR mismatching, haploidentical stem cell transplantation, killer cell immunoglobulin-like receptor, hematopoietic, stem cell transplantation.
Abstract: Natural killer (NK) cell behavior and function are controlled by a balance between negative
or positive signals generated by an extensive array of activating and inhibiting receptors, including
killer cell immunoglobulin-like receptor (KIR) proteins, main components of the innate immune system
that contribute to initial responses against viral infected-transformed cells through generation of
the release of cytokines and cytotoxicity. What is certain is that KIRs are genetically polymorphic and
the extent of KIRs diversity within the individuals may have the potential outcomes for hematopoietic
stem cell transplantation (HSCT). In this regard, recent studies suggest that KIR is as imperative as its
ligand (HLA) in stem cell transplantation for malignant diseases. However, unlike HLA epitope mismatches,
which are well-known causes of NK alloreactivity, a complete understanding of KIR genes'
role in HSCT remains unclear. Because of genetic variability in KIR gene content, allelic polymorphism,
and cell-surface expression among individuals, an appropriate selection of donors based on
HLA and KIR profiles is crucial to improve outcomes of stem cell transplantation. In addition, the impact
of the KIR/HLA interaction on HSCT outcomes needs to be investigated more comprehensively.
The present work aimed to review the NK cell regeneration, KIR gene polymorphisms, and KIRligand
binding on outcomes in hematologic malignancies following haploidentical stem cell transplantation.
Comprehensive data gathered from the literature can provide new insight into the significance
of KIR matching status in transplantations.