1. CCL19‐Positive Lymph Node Stromal Cells Govern the Onset of Inflammatory Arthritis via Tropomyosin Receptor Kinase.
- Author
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Schälter, Fabian, Azizov, Vugar, Frech, Michael, Dürholz, Kerstin, Schmid, Eva, Hendel, Anna, Sarfati, Ilann, Maeda, Yuichi, Sokolova, Maria, Miyagawa, Ippei, Focke, Kristin, Sarter, Kerstin, van Baarsen, Lisa G. M., Krautwald, Stefan, Schett, Georg, and Zaiss, Mario M.
- Subjects
INFLAMMATION prevention ,ARTHRITIS prevention ,LYMPH nodes ,IN vitro studies ,T cells ,PROTEIN-tyrosine kinase inhibitors ,IMMUNOGLOBULINS ,MICE ,STROMAL cells ,ANIMAL experimentation ,CYTOKINES ,SEQUENCE analysis - Abstract
Objective: The study objective was to assess the role of CCL19+ lymph node stromal cells of the joint‐draining popliteal lymph node (pLN) for the development of arthritis. Methods: CCL19+ lymph node stromal cells were spatiotemporally depleted for five days in the pLN before the onset of collagen‐induced arthritis (CIA) using Ccl19‐Cre × iDTR mice. In addition, therapeutic treatment with recombinant CCL19–immunoglobulin G (IgG), locally injected in the footpad, was used to confirm the results. RNA sequencing of lymph node stromal cells combined with T cell coculture assays using tropomyosin receptor kinase (Trk) family inhibitors together with in vivo local pLN small interfering RNA (siRNA) treatments were used to elucidate the pathway by which CCL19+ lymph node stromal cells initiate the onset of arthritis. Results: Spatiotemporal depletion of CCL19+ lymph node stromal cells prevented disease onset in CIA mice. These inhibitory effects could be mimicked by local CCL19‐IgG treatment. The messenger RNA sequencing analyses showed that CCL19+ lymph node stromal cells down‐regulated the expression of the tropomyosin receptor kinase A (TrkA) just before disease onset. Blocking TrkA in lymph node stromal cells led to increased T cell proliferation in in vitro coculture assays. Similar effects were observed with the pan‐Trk inhibitor larotrectinib in cocultures of lymph node stromal cells of patients with rheumatoid arthritis and T cells. Finally, local pLN treatment with TrkA inhibitor and TrkA siRNA led to exacerbated arthritis scores. Conclusion: CCL19+ lymph node stromal cells are crucially involved in the development of inflammatory arthritis. Therefore, targeting of CCL19+ lymph node stromal cells via TRK could provide a tool to prevent arthritis. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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