1
|
Guglielmo C, Bin S, Cantarelli C, Hartzell S, Angeletti A, Donadei C, Cumpelik A, Anderson L, Cody E, Sage PT, La Manna G, Fiaccadori E, Heeger PS, Cravedi P. Erythropoietin Reduces Auto- and Alloantibodies by Inhibiting T Follicular Helper Cell Differentiation. J Am Soc Nephrol 2021; 32:2542-2560. [PMID: 34261755 PMCID: PMC8722788 DOI: 10.1681/asn.2021010098] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 06/16/2021] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Although high-affinity IgG auto- and alloantibodies are important drivers of kidney inflammation that can result in ESKD, therapeutic approaches that effectively reduce such pathogenic antibodies remain elusive. Erythropoietin (EPO) has immunomodulatory functions, but its effects on antibody production are unknown. METHODS We assessed the effect and underlying mechanisms of EPO/EPO receptor (EPOR) signaling on primary and secondary, T cell-dependent and T-independent antibody formation using in vitro culture systems, murine models of organ transplantation and lupus nephritis, and mice conditionally deficient for the EPOR expressed on T cells or B cells. RESULTS In wild-type mice, recombinant EPO inhibited primary, T cell-dependent humoral immunity to model antigens and strong, polyclonal stimuli, but did not alter T-independent humoral immune responses. EPO also significantly impaired secondary humoral immunity in a potent allogeneic organ transplant model system. The effects required T cell, but not B cell, expression of the EPOR and resulted in diminished frequencies of germinal center (GC) B cells and T follicular helper cells (TFH). In vitro and in vivo experiments showed that EPO directly prevented TFH differentiation and function via a STAT5-dependent mechanism that reduces CD4+ T cell expression of Bcl6. In lupus models, EPO reduced TFH, GC B cells, and autoantibody production, and abrogated autoimmune glomerulonephritis, demonstrating clinical relevance. In vitro studies verified that EPO prevents differentiation of human TFH cells. CONCLUSIONS Our findings newly demonstrate that EPO inhibits TFH-dependent antibody formation, an observation with potential implications for treating antibody-mediated diseases, including those of the kidney.
Collapse
Affiliation(s)
- Chiara Guglielmo
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York,Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Sofia Bin
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York,Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Chiara Cantarelli
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York,Nephrology Unit, University Hospital of Parma, Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Susan Hartzell
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Andrea Angeletti
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York,Division of Nephrology, Dialysis, Transplantation, Giannina Gaslini Children's Hospital, Genoa, Italy
| | - Chiara Donadei
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York,Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Arun Cumpelik
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Lisa Anderson
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Evan Cody
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Peter T. Sage
- Transplantation Research Center, Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Gaetano La Manna
- Department of Experimental, Diagnostic and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Enrico Fiaccadori
- Nephrology Unit, University Hospital of Parma, Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Peter S. Heeger
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Paolo Cravedi
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, New York
| |
Collapse
|
2
|
Phagocyte respiratory burst activates macrophage erythropoietin signalling to promote acute inflammation resolution. Nat Commun 2016; 7:12177. [PMID: 27397585 PMCID: PMC4942576 DOI: 10.1038/ncomms12177] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 06/08/2016] [Indexed: 12/12/2022] Open
Abstract
Inflammation resolution is an active process, the failure of which causes uncontrolled inflammation which underlies many chronic diseases. Therefore, endogenous pathways that regulate inflammation resolution are fundamental and of wide interest. Here, we demonstrate that phagocyte respiratory burst-induced hypoxia activates macrophage erythropoietin signalling to promote acute inflammation resolution. This signalling is activated following acute but not chronic inflammation. Pharmacological or genetical inhibition of the respiratory burst suppresses hypoxia and macrophage erythropoietin signalling. Macrophage-specific erythropoietin receptor-deficient mice and chronic granulomatous disease (CGD) mice, which lack the capacity for respiratory burst, display impaired inflammation resolution, and exogenous erythropoietin enhances this resolution in WT and CGD mice. Mechanistically, erythropoietin increases macrophage engulfment of apoptotic neutrophils via PPARγ, promotes macrophage removal of debris and enhances macrophage migration to draining lymph nodes. Together, our results provide evidences of an endogenous pathway that regulates inflammation resolution, with important implications for treating inflammatory conditions.
Collapse
|
3
|
Li K, Dan Z, Gesang L, Wang H, Zhou Y, Du Y, Ren Y, Shi Y, Nie Y. Comparative Analysis of Gut Microbiota of Native Tibetan and Han Populations Living at Different Altitudes. PLoS One 2016; 11:e0155863. [PMID: 27232599 PMCID: PMC4883765 DOI: 10.1371/journal.pone.0155863] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 05/05/2016] [Indexed: 12/15/2022] Open
Abstract
The factors driving the composition of gut microbiota are still only partly understood but appear to include environmental, cultural, and genetic factors. In order to obtain more insight into the relative importance of these factors, we analyzed the microbiome composition in subjects of Tibetan or Han descent living at different altitudes. DNA was isolated from stool samples. Using polymerase chain reaction methodology, the 16S rRNA V1-V3 regions were amplified and the sequence information was analyzed by principal coordinates analysis and Lefse analyses. Contrasting the Tibetan and Han populations both living at the 3600 m altitude, we found that the Tibetan microbiome is characterized by a relative abundance of Prevotella whereas the Han stool was enriched in Bacteroides. Comparing the microbiome of Han stool obtained from populations living at different altitudes revealed a more energy efficient flora in samples from those living at higher altitude relative to their lower-altitude counterparts. Comparison of the stool microbiome of Tibetan herders living at 4800 m to rural Tibetans living at 3600 m altitude shows that the former have a flora enriched in butyrate-producing bacteria, possibly in response to the harsher environment that these herders face. Thus, the study shows that both altitude and genetic/cultural background have a significant influence on microbiome composition, and it represents the first attempt to compare stool microbiota of Tibetan and Han populations in relation to altitude.
Collapse
Affiliation(s)
- Kang Li
- Department of Gastroenterology, Guangzhou First People’s Hospital of Guangzhou Medical University, Guangzhou, 510180, Guangdong Province, China
- High Altitude Medical Research Institute, People’s Hospital of Tibet Autonomous Region, Lhasa, 850000, China
| | - Zeng Dan
- High Altitude Medical Research Institute, People’s Hospital of Tibet Autonomous Region, Lhasa, 850000, China
| | - Luobu Gesang
- High Altitude Medical Research Institute, People’s Hospital of Tibet Autonomous Region, Lhasa, 850000, China
| | - Hong Wang
- Department of Gastroenterology, Guangzhou First People’s Hospital of Guangzhou Medical University, Guangzhou, 510180, Guangdong Province, China
| | - Yongjian Zhou
- Department of Gastroenterology, Guangzhou First People’s Hospital of Guangzhou Medical University, Guangzhou, 510180, Guangdong Province, China
| | - Yanlei Du
- Department of Gastroenterology, Guangzhou First People’s Hospital of Guangzhou Medical University, Guangzhou, 510180, Guangdong Province, China
| | - Yi Ren
- Shanghai Major Bio-pharm Technology Co., Ltd., Shanghai, 201203, China
| | - Yixiang Shi
- Shanghai Major Bio-pharm Technology Co., Ltd., Shanghai, 201203, China
| | - Yuqiang Nie
- Department of Gastroenterology, Guangzhou First People’s Hospital of Guangzhou Medical University, Guangzhou, 510180, Guangdong Province, China
| |
Collapse
|