Abstract
Background
The mechanisms underlying the loss of self-tolerance in systemic lupus erythematosus (SLE) are incompletely deciphered. TGF-β plays a key role in self-tolerance demonstrated by the onset of a fatal autoimmune syndrome associated with lupus autoantibodies in mice lacking a functional TGF-β receptor. The present work aims to define whether resistance to TGF-β might contribute to the pathogenesis of SLE.
Methods
Twenty-two patients with active SLE, 16 with other connective tissue diseases, and 10 healthy controls were prospectively included in this study. The effects of exogenous TGF-β1 on IL-2-dependent T-cell proliferation, IFN-γ secretion, and target gene transcription were analyzed on peripheral blood mononuclear cells.
Results
Our results showed that 75% of patients with SLE or other connective tissue diseases were totally or partially resistant to the effects of TGF-β1. The responses to the anti-proliferative and transcriptional effects of TGF-β were, however, discordant in a high proportion of our patients. Hence, we distinguish three distinct profiles of resistance to TGF-β1 and suggest that patients may exhibit different defects affecting distinct points of TGF-β1 signaling pathways.
Conclusion
Our data demonstrate the presence of an impaired response of peripheral cells to TGF-β1 in patients with active SLE that may participate to the pathogenesis of the disease. Further studies will be necessary to delineate the mechanisms underlying the lymphocyte resistance to TGF-β1 in SLE.
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Asma Elbeldi-Ferchiou and Mélika Ben Ahmed contributed equally to this work.
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Elbeldi-Ferchiou, A., Ben Ahmed, M., Smiti-Khanfir, M. et al. Resistance to Exogenous TGF-β Effects in Patients with Systemic Lupus Erythematosus. J Clin Immunol 31, 574–583 (2011). https://doi.org/10.1007/s10875-011-9531-9
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DOI: https://doi.org/10.1007/s10875-011-9531-9