Abstract: FR-PO827
Patients with ANCA-Associated Vasculitis (AAV) Display Major Phenotypic Signs of T-Cell Dysfunction
Session Information
- Glomerular Diseases: Immunology, Inflammation - I
November 08, 2019 | Location: Exhibit Hall, Walter E. Washington Convention Center
Abstract Time: 10:00 AM - 12:00 PM
Category: Glomerular Diseases
- 1202 Glomerular Diseases: Immunology and Inflammation
Authors
- Manrique, Joaquin, Complejo Hospital de Navarra, Pamplona, Spain
- Hartzell, Susan, Icahn School of Medicine at Mount Sinai, New York, New York, United States
- Chan, Emilie, Mount Sinai Hospital, New York, New York, United States
- Tassiulas, Ioannis, Mount Sinai Hospital, New York, New York, United States
- Angeletti, Andrea, Sant'Orsola-Malpighi Hospital, Bologna, Italy
- Cantarelli, Chiara, Università di Parma, Parma, Italy
- Guglielmo, Chiara, Icahn School of Medicine at Mount Sinai, New York, New York, United States
- Andrighetto, Sofia, Icahn School of Medicine at Mount Sinai, New York, New York, United States
- Anderson, Lisa, Icahn School of Medicine at Mount Sinai, New York, New York, United States
- Cravedi, Paolo, Icahn School of Medicine at Mount Sinai, New York, New York, United States
Background
In chronic infection and tumors, persistent T cell stimulation results in functional T cell exhaustion and anergy but limited data are available on the association between chronic inflammation in AAV and T cell dysfunction.
Methods
We performed a comprehensive flow-cytometric analyses of major T cell markers of T cells dysfunction, including exhaustion (KLRG1+PD1+CD57-), and anergy (KLRG1+PD1-CD57+) in 20 patients with AAV with renal involvement (at clinical onset, before immunosuppressive therapy initiation) and 12 healthy controls (HC). We also measured CD4+CD25+CD127low regulatory T cells (Treg) and intracellular IFN-g, IL-4, and IL-17 production in the same study groups.
Results
We found a remarkable and statistically significant increase in CD4+ and C8+ T cells with exhausted and anergic phenotype in AAV patients compared to HC (Fig. 1A-D). AAV patients also displayed significantly higher levels of circulating Treg (Fig. 1E). Despite Treg increase, we did not record a significant difference in intracellular cytokine production.
Conclusion
Patients with AAV display a unique immune phenotype characterized by extensive T cell dysfunction, associated with increased Treg, suggesting the existence of chronic inflammation before clinical onset of the disease.
Fig. 1. Percentages of CD4+ (A-B) and CD8+ T (C-D) cells with exhausted or anergic phenotype and regulatory T cells (Treg) (E) according to disease group and in healty controls (HC). *P〈0.05.