Skin Cancer Risk Is Modified by KIR/HLA Interactions That Influence the Activation of Natural Killer Immune Cells

Area of Science:

• Immunogenetics
• Dermatology
• Cancer Research

Background:

• Natural killer (NK) cell phenotype is regulated by killer-cell immunoglobulin-like receptors (KIR) interacting with HLA class I ligands.
• The KIR gene family's high polymorphism presents challenges for standard genetic association studies.
• Understanding KIR-HLA interactions is crucial for elucidating genetic predispositions to skin cancers.

Purpose of the Study:

• To investigate the association between KIR gene content variations, HLA class I ligand status, and the risk of keratinocyte skin cancers (BCC and SCC).
• To explore potential interactions between KIR and HLA genotypes in the development of BCC and SCC.
• To examine the relationship between KIR gene variants and p53 alterations in basal cell carcinoma.

Main Methods:

• Population-based study analyzing KIR gene content and HLA-B/HLA-C ligand status.
• Interaction analysis was performed for KIR gene variations with specific HLA-B (Bw4 vs. Bw6) and HLA-C (C1 vs. C2) alleles.
• Association between KIR B haplotype and p53 alteration status in BCC tumors was assessed.

Main Results:

• KIR centromeric B haplotype significantly increased the risk of multiple BCC tumors (OR, 2.39).
• Significant interactions were observed between HLA-C and KIR2DS3, and between HLA-B and the telomeric KIR B haplotype (including KIR3DS1, KIR2DS1) or KIR2DS5 for BCC risk.
• Strong association found between KIR B haplotype and p53 alterations in BCC tumors, indicating KIR B carriers are more likely to have abnormal p53.

Conclusions:

• Functional interactions between KIR and HLA genes significantly modify the risk of developing BCC and SCC.
• KIR genes, particularly those in the B haplotype, exert selective pressure for altered p53 in BCC tumors.
• These findings highlight the importance of KIR-HLA interactions in skin cancer susceptibility and pathogenesis.