Spondyloarthritis and the Human Leukocyte Antigen (HLA)-B27 Connection

Overview

Journal Front Immunol

Specialty Allergy & Immunology

Date 2021 Mar 25

PMID 33763060

Citations 15

Authors

Chengappa G Kavadichanda

Jie Geng

Sree Nethra Bulusu

Vir Singh Negi

Malini Raghavan

Affiliations

Soon will be listed here.

Abstract

Heritability of Spondyloarthritis (SpA) is highlighted by several familial studies and a high association with the presence of human leukocyte antigen (HLA)-B27. Though it has been over four decades since the association of HLA-B27 with SpA was first determined, the pathophysiological roles played by specific HLA-B27 allotypes are not fully understood. Popular hypotheses include the presentation of arthritogenic peptides, triggering of endoplasmic reticulum (ER) stress by misfolded HLA-B27, and the interaction between free heavy chains or heavy chain homodimers of HLA-B27 and immune receptors to drive IL-17 responses. Several non-HLA susceptibility loci have also been identified for SpA, including endoplasmic reticulum aminopeptidases (ERAP) and those related to the IL-23/IL-17 axes. In this review, we summarize clinical aspects of SpA including known characteristics of gut inflammation, enthesitis and new bone formation and the existing models for understanding the association of HLA-B27 with disease pathogenesis. We also examine newer insights into the biology of HLA class I (HLA-I) proteins and their implications for expanding our understanding of HLA-B27 contributions to SpA pathogenesis.

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