Despite the benefit of insulin, blockade of autoimmune attack and regeneration of pancreatic islets are ultimate goals for the complete cure of type 1 diabetes (T1D). Long-term consumption of ω-3 polyunsaturated fatty acids (PUFAs) is known to suppress inflammatory processes, making these fatty acids candidates for the prevention and amelioration of autoimmune diseases. Here, we explored the preventative and therapeutic effects of ω-3 PUFAs on T1D. In NOD mice, dietary intervention with ω-3 PUFAs sharply reduced the incidence of T1D, modulated the differentiation of Th cells and Tregs, and decreased the levels of IFN-γ, IL-17, IL-6, and TNF-α. ω-3 PUFAs exerted similar effects on the differentiation of CD4+ T cells isolated from human peripheral blood mononuclear cells. The regulation of CD4+ T cell differentiation was mediated at least in part through ω-3 PUFA eicosanoid derivatives and by mTOR complex 1 (mTORC1) inhibition. Importantly, therapeutic intervention in NOD mice through nutritional supplementation or lentivirus-mediated expression of an ω-3 fatty acid desaturase, m
Xinyun Bi, Fanghong Li, Shanshan Liu, Yan Jin, Xin Zhang, Tao Yang, Yifan Dai, Xiaoxi Li, Allan Zijian Zhao
Genetic variations in the
Mohd Hafeez Faridi, Samia Q. Khan, Wenpu Zhao, Ha Won Lee, Mehmet M. Altintas, Kun Zhang, Vinay Kumar, Andrew R. Armstrong, Carmelo Carmona-Rivera, Jessica M. Dorschner, Abigail M. Schnaith, Xiaobo Li, Yogita Ghodke-Puranik, Erica Moore, Monica Purmalek, Jorge Irizarry-Caro, Tingting Zhang, Rachael Day, Darren Stoub, Victoria Hoffmann, Shehryar Jehangir Khaliqdina, Prachal Bhargava, Ana M. Santander, Marta Torroella-Kouri, Biju Issac, David J. Cimbaluk, Andrew Zloza, Rajeev Prabhakar, Shashank Deep, Meenakshi Jolly, Kwi Hye Koh, Jonathan S. Reichner, Elizabeth M. Bradshaw, JianFeng Chen, Luis F. Moita, Peter S. Yuen, Wanxia Li Tsai, Bhupinder Singh, Jochen Reiser, Swapan K. Nath, Timothy B. Niewold, Roberto I. Vazquez-Padron, Mariana J. Kaplan, Vineet Gupta
B cells contribute to multiple aspects of autoimmune disorders and may play a role in triggering disease. Thus, targeting B cells may be a promising strategy for treating autoimmune disorders. Better understanding of the B cell subsets that are responsible for the development of autoimmunity will be critical for developing efficient therapies. Here we have reported that B cells expressing the transcription factor T-bet promote the rapid appearance of autoantibodies and germinal centers in spontaneous murine models of systemic lupus erythematosus (SLE). Conditional deletion of T-bet from B cells impaired the formation of germinal centers and mitigated the development of kidney damage and rapid mortality in SLE mice. B cell–specific deletion of T-bet was also associated with lower activation of both B cells and T cells. Taken together, our results suggest that targeting T-bet–expressing B cells may be a potential target for therapy for autoimmune diseases.
Kira Rubtsova, Anatoly V. Rubtsov, Joshua M. Thurman, Johanna M. Mennona, John W. Kappler, Philippa Marrack
MicroRNAs (miRs) are tightly regulated in the immune system, and aberrant expression of miRs often results in hematopoietic malignancies and autoimmune diseases. Previously, it was suggested that elevated levels of miR-27 in T cells isolated from patients with multiple sclerosis facilitate disease progression by inhibiting Th2 immunity and promoting pathogenic Th1 responses. Here we have demonstrated that, although mice with T cell–specific overexpression of miR-27 harbor dysregulated Th1 responses and develop autoimmune pathology, these disease phenotypes are not driven by miR-27 in effector T cells in a cell-autonomous manner. Rather, dysregulation of Th1 responses and autoimmunity resulted from a perturbed Treg compartment. Excessive miR-27 expression in murine T cells severely impaired Treg differentiation. Moreover, Tregs with exaggerated miR-27–mediated gene regulation exhibited diminished homeostasis and suppressor function in vivo. Mechanistically, we determined that miR-27 represses several known as well as previously uncharacterized targets that play critical roles in controlling multiple aspects of Treg biology. Collectively, our data show that miR-27 functions as a key regulator in Treg development and function and suggest that proper regulation of miR-27 is pivotal to safeguarding Treg-mediated immunological tolerance.
Leilani O. Cruz, Somaye Sadat Hashemifar, Cheng-Jang Wu, Sunglim Cho, Duc T. Nguyen, Ling-Li Lin, Aly Azeem Khan, Li-Fan Lu
Alterations in the apoptosis of immune cells have been associated with autoimmunity. Here, we have identified a homozygous missense mutation in the gene encoding the base excision repair enzyme Nei endonuclease VIII-like 3 (
Michel J. Massaad, Jia Zhou, Daisuke Tsuchimoto, Janet Chou, Haifa Jabara, Erin Janssen, Salomé Glauzy, Brennan G. Olson, Henner Morbach, Toshiro K. Ohsumi, Klaus Schmitz, Markianos Kyriacos, Jennifer Kane, Kumiko Torisu, Yusaku Nakabeppu, Luigi D. Notarangelo, Eliane Chouery, Andre Megarbane, Peter B. Kang, Eman Al-Idrissi, Hasan Aldhekri, Eric Meffre, Masayuki Mizui, George C. Tsokos, John P. Manis, Waleed Al-Herz, Susan S. Wallace, Raif S. Geha
Although necrosis and necroinflammation are central features of many liver diseases, the role of programmed necrosis in the context of inflammation-dependent hepatocellular death remains to be fully determined. Here, we have demonstrated that the pseudokinase mixed lineage kinase domain–like protein (MLKL), which plays a key role in the execution of receptor-interacting protein (RIP) kinase–dependent necroptosis, is upregulated and activated in human autoimmune hepatitis and in a murine model of inflammation-dependent hepatitis. Using genetic and pharmacologic approaches, we determined that hepatocellular necrosis in experimental hepatitis is driven by an MLKL-dependent pathway that occurs independently of RIPK3. Moreover, we have provided evidence that the cytotoxic activity of the proinflammatory cytokine IFN-γ in hepatic inflammation is strongly connected to induction of MLKL expression via activation of the transcription factor STAT1. In summary, our results reveal a pathway for MLKL-dependent programmed necrosis that is executed in the absence of RIPK3 and potentially drives the pathogenesis of severe liver diseases.
Claudia Günther, Gui-Wei He, Andreas E. Kremer, James M. Murphy, Emma J. Petrie, Kerstin Amann, Peter Vandenabeele, Andreas Linkermann, Christopher Poremba, Ulrike Schleicher, Christin Dewitz, Stefan Krautwald, Markus F. Neurath, Christoph Becker, Stefan Wirtz
Patients with mutations in
Tineke Cantaert, Jean-Nicolas Schickel, Jason M. Bannock, Yen-Shing Ng, Christopher Massad, Fabien R. Delmotte, Natsuko Yamakawa, Salome Glauzy, Nicolas Chamberlain, Tuure Kinnunen, Laurence Menard, Aubert Lavoie, Jolan E. Walter, Luigi D. Notarangelo, Julie Bruneau, Waleed Al-Herz, Sara Sebnem Kilic, Hans D. Ochs, Charlotte Cunningham-Rundles, Mirjam van der Burg, Taco W. Kuijpers, Sven Kracker, Hideo Kaneko, Yujin Sekinaka, Shigeaki Nonoyama, Anne Durandy, Eric Meffre
Studies of the genetic factors associated with human autoimmune disease suggest a multigenic origin of susceptibility; however, how these factors interact and through which tolerance pathways they operate generally remain to be defined. One key checkpoint occurs through the activity of the autoimmune regulator
Irina Proekt, Corey N. Miller, Marion Jeanne, Kayla J. Fasano, James J. Moon, Clifford A. Lowell, Douglas B. Gould, Mark S. Anderson, Anthony L. DeFranco
Eleftheria Lefkou, Apostolos Mamopoulos, Themistoklis Dagklis, Christos Vosnakis, David Rousso, Guillermina Girardi
Systemic lupus erythematosus (SLE) is a devastating multisystemic autoimmune disorder. However, the molecular mechanisms underlying its pathogenesis remain elusive. Some patients with Noonan syndrome, a congenital disorder predominantly caused by gain-of-function mutations in the protein tyrosine phosphatase SH2 domain–containing PTP (SHP2), have been shown to develop SLE, suggesting a functional correlation between phosphatase activity and systemic autoimmunity. To test this directly, we measured SHP2 activity in spleen lysates isolated from lupus-prone MRL/
Jianxun Wang, Masayuki Mizui, Li-Fan Zeng, Roderick Bronson, Michele Finnell, Cox Terhorst, Vasileios C. Kyttaris, George C. Tsokos, Zhong-Yin Zhang, Maria I. Kontaridis
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