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MALT1 proteolytic activity suppresses autoimmunity in a T cell intrinsic manner

Annelies Demeyer (UGent) , Ioannis Skordos (UGent) , Yasmine Driege (UGent) , Marja Kreike (UGent) , Tino Hochepied (UGent) , Mathijs Baens, Jens Staal (UGent) and Rudi Beyaert (UGent)
Author
Organization
Abstract
MALT1 is a central signaling component in innate and adaptive immunity by regulating NF-kappa B and other key signaling pathways in different cell types. Activities of MALT1 are mediated by its scaffold and protease functions. Because of its role in lymphocyte activation and proliferation, inhibition of MALT1 proteolytic activity is of high interest for therapeutic targeting in autoimmunity and certain lymphomas. However, recent studies showing that Mak1 protease-dead knock-in (Malt1-PD) mice suffer from autoimmune disease have somewhat tempered the initial enthusiasm. Although it has been proposed that an imbalance between immune suppressive regulatory T cells (Tregs) and activated effector CD4(+) T cells plays a key role in the autoimmune phenotype of Malt1-PD mice, the specific contribution of MALT1 proteolytic activity in T cells remains unclear. Using T cell-conditional Malt1 protease-dead knock-in (Malt1-PDT) mice, we here demonstrate that MALT1 has a T cell-intrinsic role in regulating the homeostasis and function of thymic and peripheral T cells. T cell-specific ablation of MALT1 proteolytic activity phenocopies mice in which MALT1 proteolytic activity has been genetically inactivated in all cell types. The Malt1-PDT mice have a reduced number of Tregs in the thymus and periphery, although the effect in the periphery is less pronounced compared to full-body Malt1-PD mice, indicating that also other cell types may promote Treg induction in a MALT1 protease-dependent manner. Despite the difference in peripheral Treg number, both T cell-specific and full-body Malt1-PD mice develop ataxia and multi-organ inflammation to a similar extent. Furthermore, reconstitution of the full-body Malt1-PD mice with T cell-specific expression of wild-type human MALT1 eliminated all signs of autoimmunity. Together, these findings establish an important T cell-intrinsic role of MALT1 proteolytic activity in the suppression of autoimmune responses.
Keywords
KAPPA-B ACTIVATION, PARACASPASE MALT1, EFFECTOR T, COMBINED, IMMUNODEFICIENCY, UBIQUITIN LIGASE, CTLA-4, CLEAVAGE, MICE, INACTIVATION, INHIBITOR, autoimmunity, inflammation, Treg, Breg, CTLA-4, paracaspase, protease, lymphocyte

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MLA
Demeyer, Annelies, et al. “MALT1 Proteolytic Activity Suppresses Autoimmunity in a T Cell Intrinsic Manner.” FRONTIERS IN IMMUNOLOGY, vol. 10, 2019.
APA
Demeyer, A., Skordos, I., Driege, Y., Kreike, M., Hochepied, T., Baens, M., … Beyaert, R. (2019). MALT1 proteolytic activity suppresses autoimmunity in a T cell intrinsic manner. FRONTIERS IN IMMUNOLOGY, 10.
Chicago author-date
Demeyer, Annelies, Ioannis Skordos, Yasmine Driege, Marja Kreike, Tino Hochepied, Mathijs Baens, Jens Staal, and Rudi Beyaert. 2019. “MALT1 Proteolytic Activity Suppresses Autoimmunity in a T Cell Intrinsic Manner.” FRONTIERS IN IMMUNOLOGY 10.
Chicago author-date (all authors)
Demeyer, Annelies, Ioannis Skordos, Yasmine Driege, Marja Kreike, Tino Hochepied, Mathijs Baens, Jens Staal, and Rudi Beyaert. 2019. “MALT1 Proteolytic Activity Suppresses Autoimmunity in a T Cell Intrinsic Manner.” FRONTIERS IN IMMUNOLOGY 10.
Vancouver
1.
Demeyer A, Skordos I, Driege Y, Kreike M, Hochepied T, Baens M, et al. MALT1 proteolytic activity suppresses autoimmunity in a T cell intrinsic manner. FRONTIERS IN IMMUNOLOGY. 2019;10.
IEEE
[1]
A. Demeyer et al., “MALT1 proteolytic activity suppresses autoimmunity in a T cell intrinsic manner,” FRONTIERS IN IMMUNOLOGY, vol. 10, 2019.
@article{8628745,
  abstract     = {MALT1 is a central signaling component in innate and adaptive immunity by regulating NF-kappa B and other key signaling pathways in different cell types. Activities of MALT1 are mediated by its scaffold and protease functions. Because of its role in lymphocyte activation and proliferation, inhibition of MALT1 proteolytic activity is of high interest for therapeutic targeting in autoimmunity and certain lymphomas. However, recent studies showing that Mak1 protease-dead knock-in (Malt1-PD) mice suffer from autoimmune disease have somewhat tempered the initial enthusiasm. Although it has been proposed that an imbalance between immune suppressive regulatory T cells (Tregs) and activated effector CD4(+) T cells plays a key role in the autoimmune phenotype of Malt1-PD mice, the specific contribution of MALT1 proteolytic activity in T cells remains unclear. Using T cell-conditional Malt1 protease-dead knock-in (Malt1-PDT) mice, we here demonstrate that MALT1 has a T cell-intrinsic role in regulating the homeostasis and function of thymic and peripheral T cells. T cell-specific ablation of MALT1 proteolytic activity phenocopies mice in which MALT1 proteolytic activity has been genetically inactivated in all cell types. The Malt1-PDT mice have a reduced number of Tregs in the thymus and periphery, although the effect in the periphery is less pronounced compared to full-body Malt1-PD mice, indicating that also other cell types may promote Treg induction in a MALT1 protease-dependent manner. Despite the difference in peripheral Treg number, both T cell-specific and full-body Malt1-PD mice develop ataxia and multi-organ inflammation to a similar extent. Furthermore, reconstitution of the full-body Malt1-PD mice with T cell-specific expression of wild-type human MALT1 eliminated all signs of autoimmunity. Together, these findings establish an important T cell-intrinsic role of MALT1 proteolytic activity in the suppression of autoimmune responses.},
  articleno    = {1898},
  author       = {Demeyer, Annelies and Skordos, Ioannis and Driege, Yasmine and Kreike, Marja and Hochepied, Tino and Baens, Mathijs and Staal, Jens and Beyaert, Rudi},
  issn         = {1664-3224},
  journal      = {FRONTIERS IN IMMUNOLOGY},
  keywords     = {KAPPA-B ACTIVATION,PARACASPASE MALT1,EFFECTOR T,COMBINED,IMMUNODEFICIENCY,UBIQUITIN LIGASE,CTLA-4,CLEAVAGE,MICE,INACTIVATION,INHIBITOR,autoimmunity,inflammation,Treg,Breg,CTLA-4,paracaspase,protease,lymphocyte},
  language     = {eng},
  pages        = {13},
  title        = {MALT1 proteolytic activity suppresses autoimmunity in a T cell intrinsic manner},
  url          = {http://dx.doi.org/10.3389/fimmu.2019.01898},
  volume       = {10},
  year         = {2019},
}

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