In T cells, processes such as migration and immunological synapse formation are accompanied by the dynamic reorganization of the actin cytoskeleton, which has been
suggested to be mediated by regulators of RhoGTPases and by F-actin bundlers. SWAP-70 controls F-actin dynamics in various immune cells, but its role in T cell
development and function has remained incompletely understood. CD4+ regulatory T (Treg) cells expressing the transcription factor Foxp3 employ diverse mechanisms to
suppress innate and adaptive immunity, which is critical for maintaining immune homeostasis and self-tolerance. Here, we propose Swap-70 as a novel member of the
Foxp3-dependent canonical Treg cell signature. We show that Swap-70-/- mice have increased numbers of Foxp3+ Treg cells with an effector/memory-like phenotype that
exhibit impaired suppressor function in vitro, but maintain overall immune homeostasis in vivo. Upon formation of an immunological synapse with antigen presenting cells in vitro, cytosolic SWAP-70 protein is selectively recruited to the interface in Treg cells. In this context, Swap-70-/- Treg cells fail to downregulate CD80/CD86 on osteoclast precursor cells by trans-endocytosis and to efficiently suppress osteoclastogenesis and osteoclast function. These data provide first evidence for a crucial role of SWAP-70 in Treg cell biology and further highlight the important non-immune function of Foxp3+ Treg cells in bone homeostasis mediated through direct SWAP-70-dependent mechanisms.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:91929 |
| Date | 11 June 2024 |
| Creators | Dohnke, Sebastian, Moehser, Stephanie, Surnov, Alexey, Kurth, Thomas, Jessberger, Rolf, Kretschmer, Karsten, Garbe, Annette I. |
| Publisher | Frontiers Media |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 1664-3224, 836646, 10.3389/fimmu.2022.836646, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/SPP 1468: Osteoimmunology - IMMUNOBONE - A Program to Unravel the Mutual Interactions between the Immune System and Bone/GA1576/1-2/ |
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