Natural Killer (NK) Cell Alloreactivity in Haploidentical Stem Cell Transplantation

Area of Science:

• Immunology
• Transplantation Biology
• Genetics

Background:

• Natural killer (NK) cells are crucial for immune surveillance and response.
• Haploidentical hematopoietic stem cell transplantation (HSCT) offers a viable treatment option when matched donors are unavailable.
• NK cell alloreactivity, influenced by KIR genes, plays a significant role in HSCT outcomes.

Purpose of the Study:

• To review the role of NK cells in haploidentical HSCT.
• To introduce theoretical concepts of KIR genes and their relevance to NK cell function.
• To define and compare NK alloreactivity prediction models used in donor selection for haploidentical HSCT.

Main Methods:

• Literature review of scientific articles and studies.
• Synthesis of theoretical concepts regarding KIR gene structure, polymorphism, and inheritance.
• Analysis of various NK alloreactivity prediction models (ligand-ligand, receptor-ligand, gene-gene, KIR haplotype, KIR-B donor group).

Main Results:

• KIR genes, their proteins, receptors, and HLA ligands are fundamental to NK cell alloreactivity.
• Several models exist to predict NK cell alloreactivity based on donor and recipient KIR gene and HLA ligand profiles.
• These models aim to predict potential NK cell-mediated rejection or graft-versus-host disease.

Conclusions:

• Understanding KIR gene interactions is key to predicting NK cell alloreactivity in haploidentical HSCT.
• The optimal model for predicting KIR alloreactivity and its clinical significance in donor selection remains an active area of research.
• Further investigation is needed to refine donor selection algorithms for improved haploidentical HSCT success rates.