LAMP3 induces apoptosis and autoantigen release in Sjögren's syndrome patients
Tsutomu Tanaka, Blake M Warner, Toshio Odani, Youngmi Ji, Ying-Qian Mo, Hiroyuki Nakamura, Shyh-Ing Jang, Hongen Yin, Drew G Michael, Noriyuki Hirata, Futoshi Suizu, Satoko Ishigaki, Fabiola Reis Oliveira, Ana Carolina F Motta, Alfredo Ribeiro-Silva, Eduardo M Rocha, Tatsuya Atsumi, Masayuki Noguchi, John A Chiorini, Tsutomu Tanaka, Blake M Warner, Toshio Odani, Youngmi Ji, Ying-Qian Mo, Hiroyuki Nakamura, Shyh-Ing Jang, Hongen Yin, Drew G Michael, Noriyuki Hirata, Futoshi Suizu, Satoko Ishigaki, Fabiola Reis Oliveira, Ana Carolina F Motta, Alfredo Ribeiro-Silva, Eduardo M Rocha, Tatsuya Atsumi, Masayuki Noguchi, John A Chiorini
Abstract
Primary Sjögren's syndrome (pSS) is a complex autoimmune disease characterized by dysfunction of secretory epithelia with only palliative therapy. Patients present with a constellation of symptoms, and the diversity of symptomatic presentation has made it difficult to understand the underlying disease mechanisms. In this study, aggregation of unbiased transcriptome profiling data sets of minor salivary gland biopsies from controls and Sjögren's syndrome patients identified increased expression of lysosome-associated membrane protein 3 (LAMP3/CD208/DC-LAMP) in a subset of Sjögren's syndrome cases. Stratification of patients based on their clinical characteristics suggested an association between increased LAMP3 expression and the presence of serum autoantibodies including anti-Ro/SSA, anti-La/SSB, anti-nuclear antibodies. In vitro studies demonstrated that LAMP3 expression induces epithelial cell dysfunction leading to apoptosis. Interestingly, LAMP3 expression resulted in the accumulation and release of intracellular TRIM21 (one component of SSA), La (SSB), and α-fodrin protein, common autoantigens in Sjögren's syndrome, via extracellular vesicles in an apoptosis-independent mechanism. This study defines a clear role for LAMP3 in the initiation of apoptosis and an independent pathway for the extracellular release of known autoantigens leading to the formation of autoantibodies associated with this disease.ClinicalTrials.gov Identifier: NCT00001196, NCT00001390, NCT02327884.
Conflict of interest statement
The authors declare no competing interests.
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