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Curr Opin Organ Transplant. 2016 Aug;21(4):427-32. doi: 10.1097/MOT.0000000000000335.

Non-HLA antibodies in transplantation: when do they matter?

Author information

1
Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Abstract

PURPOSE OF REVIEW:

A growing interest in the contribution of non-human leukocyte antigens (non-HLA) antibodies to allograft rejection has led to the identification of multiple target antigens and investigation into the possible mechanisms of injury. Although several non-HLA antibody specificities have been identified, the largest cohorts studied are those detected using commercial assays. This review focuses on the phenotypes of injury associated with non-HLA antibody and defines in-vivo environmental characteristics that may be conducive to non-HLA antibody-mediated injury.

RECENT FINDINGS:

Mechanistic studies in animal models and clinical data suggest that an inflammatory environment, increased antigen expression, and development of neoantigens through posttranslational modifications contribute to non-HLA antibody development and their subsequent contribution to allograft injury. Furthermore, many reports show worse outcomes when HLA and non-HLA antibodies are present, suggesting possible interactions between these antibodies that lead to increased injury. Plasmapheresis and intravenous immunoglobulin are currently used to reduce HLA and non-HLA antibodies; however, therapeutic strategies targeting B cells and plasma cells simultaneously may lead to more durable antibody elimination.

SUMMARY:

Immune triggers that lead to non-HLA antibody formation are complex and poorly understood. The ability of non-HLA antibodies to mediate allograft injury may depend upon their specificity and affinity, density of the target antigen, and synergy with HLA antibodies.

PMID:
27258575
DOI:
10.1097/MOT.0000000000000335
[Indexed for MEDLINE]

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