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Hosseini H, Yi L, Kanellakis P, Cao A, Tay C, Peter K, Bobik A, Toh BH, Kyaw T. Anti-TIM-1 Monoclonal Antibody (RMT1-10) Attenuates Atherosclerosis By Expanding IgM-producing B1a Cells. J Am Heart Assoc 2018; 7:JAHA.117.008447. [PMID: 29936416 PMCID: PMC6064881 DOI: 10.1161/jaha.117.008447] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Background Peritoneal B1a cells attenuate atherosclerosis by secreting natural polyclonal immunoglobulin M (IgM). Regulatory B cells expressing T‐cell immunoglobulin mucin domain‐1 (TIM‐1) expanded through TIM‐1 ligation by anti‐TIM‐1 monoclonal antibody (RMT1‐10) induces immune tolerance. Methods and Results We examined the capacity of RMT1‐10 to expand peritoneal B1a cells to prevent atherosclerosis development and retard progression of established atherosclerosis. RMT1‐10 treatment selectively doubled peritoneal B1a cells, tripled TIM‐1+ B1a cells and increased TIM‐1+IgM+interleukin (IL)‐10+ by 3‐fold and TIM‐1+IgM+IL‐10− B1a cells by 2.5‐fold. Similar expansion of B1a B cells was observed in spleens. These effects reduced atherosclerotic lesion size, increased plasma IgM and lesion IgM deposits, and decreased oxidatively modified low‐density lipoproteins in lesions. Lesion CD4+ and CD8+ T cells, macrophages and monocyte chemoattractant protein‐1, vascular cell adhesion molecule‐1, expression of proinflammatory cytokines monocyte chemoattractant protein‐1, vascular cell adhesion molecule‐1, IL1β, apoptotic cell numbers and necrotic cores were also reduced. RMT1‐10 treatment failed to expand peritoneal B1a cells and reduce atherosclerosis after splenectomy that reduces B1a cells, indicating that these effects are B1a cell‐dependent. Apolipoprotein E‐KO mice fed a high‐fat diet for 6 weeks before treatment with RMT1‐10 also increased TIM‐1+IgM+IL‐10+ and TIM‐1+IgM+IL‐10− B1a cells and IgM levels and attenuated progression of established atherosclerosis. Conclusions RMT1‐10 treatment attenuates atherosclerosis development and progression by selectively expanding IgM producing atheroprotective B1a cells. Antibody‐based in vivo expansion of B1a cells could be an attractive approach for treating atherosclerosis.
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Affiliation(s)
- Hamid Hosseini
- Baker Heart and Diabetes Institute, Melbourne, Australia.,Centre for Inflammatory Diseases, Department of Medicine, Southern Clinical School, Monash University, Melbourne, Australia
| | - Li Yi
- Baker Heart and Diabetes Institute, Melbourne, Australia.,Centre for Inflammatory Diseases, Department of Medicine, Southern Clinical School, Monash University, Melbourne, Australia
| | | | - Anh Cao
- Baker Heart and Diabetes Institute, Melbourne, Australia
| | - Christopher Tay
- Baker Heart and Diabetes Institute, Melbourne, Australia.,Centre for Inflammatory Diseases, Department of Medicine, Southern Clinical School, Monash University, Melbourne, Australia
| | | | - Alex Bobik
- Baker Heart and Diabetes Institute, Melbourne, Australia.,Department of Immunology, Faculty of Medicine Nursing and Health Sciences, Monash University, Melbourne, Australia
| | - Ban-Hock Toh
- Centre for Inflammatory Diseases, Department of Medicine, Southern Clinical School, Monash University, Melbourne, Australia
| | - Tin Kyaw
- Baker Heart and Diabetes Institute, Melbourne, Australia .,Centre for Inflammatory Diseases, Department of Medicine, Southern Clinical School, Monash University, Melbourne, Australia
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