期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 22, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/ijms22052428
关键词
metal hapten; hypersensitivity; single-cell sequencing; joint implant failure; TCR repertoire
资金
- NIH [R01ES025797, R21ES025885]
Nickel is a common allergen that can lead to joint implant failure. This study used single-cell sequencing techniques to analyze Ni2+ -reactive T cells from patients' peripheral blood. The results showed differences in T cell sensitivity to nickel among different patients, while some common TCR beta chains may play similar roles in allergic reactions in the skin and joints.
Nickel (Ni2+) is one of the most common allergens, affecting around 10-15% of the general population. As the demand for orthopedic implant surgery rises, the number of surgical revisions due to joint implant failure also increases. There is evidence that some patients develop joint failure due to an immune response to a component of the implant, and we have found that Ni2+ is an especially important cause. Hence, understanding the mechanisms by which Ni2+ allergy induces joint implant failure becomes a critical research question. The structural basis of Ni2+ activation of pathogenic T cells is still not clear. The purpose of this study was to characterize Ni2+-reactive T cell repertoires derived from the peripheral blood of joint failure patients due to Ni2+ sensitization using single-cell sequencing techniques. We stimulated the proliferation of Ni2+ -reactive T cells from two implant failure patients in vitro, and sorted them for single-cell VDJ sequencing (10x genomics). We identified 2650 productive V-J spanning pairs. Both TCR alpha chains and beta chains were enriched. TRBV18 usage is the highest in the P7 CD4+ population (18.1%), and TRBV5-1 usage is the highest in the P7 CD8+ population (12.1%). TRBV19 and TRBV20-1 segments are present in a high percentage of both P7 and P9 sequenced T cells. Remarkably, the alpha and beta chain combination of TRAV41-TRBV18 accounts for 13.5% of the CD4+ population of P7 patient. Compared to current Ni specific T cell repertoire studies of contact dermatitis, the V alpha and V beta usages of these joint implant failure patients were different. This could be due to the different availability of self-peptides in these two different tissues. However, TRBV19 (V beta 17) was among frequently used TCR beta chains, which are common in previous reports. This implies that some pathogenic T cells could be similar in Ni2+ hypersensitivities in skin and joints. The alignment of the TCR CDR3 beta sequences showed a conserved glutamic acid (Glu) that could potentially interact with Ni2+. The study of these Ni2+ specific TCRs may shed light on the molecular mechanism of T cell activation by low molecular weight chemical haptens.
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