Argyriou A, Horuluoglu B, Galindo‐Feria AS, Diaz‐Boada JS, Sijbranda M, Notarnicola A, Dani L, van Vollenhoven A, Ramsköld D, Nennesmo I, Dastmalchi M, Lundberg IE, Diaz‐Gallo L, Chemin K. Single-cell profiling of muscle-infiltrating T cells in idiopathic inflammatory myopathies.
EMBO Mol Med 2023;
15:e17240. [PMID:
37522383 PMCID:
PMC10565639 DOI:
10.15252/emmm.202217240]
[Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 07/04/2023] [Accepted: 07/10/2023] [Indexed: 08/01/2023] Open
Abstract
Idiopathic inflammatory myopathies (IIM) are rare autoimmune systemic diseases characterized by muscle weakness and the presence of muscle-infiltrating T cells. IIM represent a clinical challenge due to heterogeneity of symptoms and variability of response to immunosuppressive treatment. Here, we performed in-depth single-cell sequencing on muscle-infiltrating T cells and peripheral blood memory T cells in six patients with recently diagnosed IIM. We identified tissue resident memory T-cell (TRM ) signatures including the expression of HOBIT, XCL1 and CXCR6 in the muscle biopsies of all patients with IIM. Clonally expanded T-cell clones were mainly found among cytotoxic and TRM implying their role in the disease pathogenesis. Finally, identical expanded T-cell clones persisting at follow-up in the muscle tissue of two patients suggest their involvement in disease chronicity. Our study reveals a muscle tissue resident memory T-cell signature in patients with IIM and a transcriptomic map to identify novel therapeutic targets in IIM.
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