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Field NS, Elbulok OA, Dybas JM, Moser EK, Dar AA, Spruce LA, Fazelinia H, Seeholzer SH, Oliver PM. Itch attenuates CD4 T-cell proliferation in mice by limiting WBP2 protein stability. Eur J Immunol 2020; 50:1468-1483. [PMID: 32459862 DOI: 10.1002/eji.201948323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 03/31/2020] [Accepted: 05/25/2020] [Indexed: 01/26/2023]
Abstract
To mount an antipathogen response, CD4 T cells must undergo rapid cell proliferation; however, poorly controlled expansion can result in diseases such as autoimmunity. One important regulator of T-cell activity is the E3 ubiquitin ligase Itch. Itch deficient patients suffer from extensive autoinflammation. Similarly, Itch deficient mice exhibit inflammation characterized by high numbers of activated CD4 T cells. While the role of Itch in limiting CD4 T-cell cytokine production has been extensively studied, it is less clear whether and how Itch regulates proliferation of these cells. We determined that Itch deficient CD4 T cells are hyperproliferative in vitro and in vivo, due to increased S phase entry. Whole cell proteomics analysis of Itch deficient primary mouse CD4 T cells revealed increased abundance of the β-catenin coactivator WW domain-binding protein 2 (WBP2). Furthermore, Itch deficient cells demonstrate increased WBP2 protein stability, and Itch and WBP2 interact in CD4 T cells. Knockdown of WBP2 in CD4 T cells caused reduced proliferation. Together, our data support that Itch attenuates CD4 T cell proliferation by promoting WBP2 degradation. This study identifies novel roles for Itch and WBP2 in regulating CD4 T cell proliferation, providing insight into how Itch may prevent inflammation.
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Affiliation(s)
- Natania S Field
- Cell and Molecular Biology Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Medical Scientist Training Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Omar A Elbulok
- College of Arts and Sciences, University of Pennsylvania, Philadelphia, PA, USA
| | - Joseph M Dybas
- Division of Protective Immunity, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Emily K Moser
- Division of Protective Immunity, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Asif A Dar
- Division of Protective Immunity, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Lynn A Spruce
- Cell Pathology Division, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Hossein Fazelinia
- Cell Pathology Division, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Steven H Seeholzer
- Cell Pathology Division, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Paula M Oliver
- Division of Protective Immunity, Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
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