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Leonhardt J, Große S, Marx C, Siwczak F, Stengel S, Bruns T, Bauer R, Kiehntopf M, Williams DL, Wang ZQ, Mosig AS, Weis S, Bauer M, Heller R. Candida albicans β-Glucan Differentiates Human Monocytes Into a Specific Subset of Macrophages. Front Immunol 2018; 9:2818. [PMID: 30555483 PMCID: PMC6284042 DOI: 10.3389/fimmu.2018.02818] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 11/14/2018] [Indexed: 12/12/2022] Open
Abstract
β-Glucan derived from cell walls of Candida albicans is a potent immune modulator. It has been shown to induce trained immunity in monocytes via epigenetic and metabolic reprogramming and to protect from lethal sepsis if applied prior to infection. Since β-glucan-trained monocytes have not been classified within the system of mononuclear phagocytes we analyzed these cells metabolically, phenotypically and functionally with a focus on monocyte-to-macrophage differentiation and compared them with naïve monocytes and other types of monocyte-derived cells such as classically (M1) or alternatively (M2) activated macrophages and monocyte-derived dendritic cells (moDCs). We show that β-glucan inhibits spontaneous apoptosis of monocytes independent from autocrine or paracrine M-CSF release and stimulates monocyte differentiation into macrophages. β-Glucan-differentiated macrophages exhibit increased cell size and granularity and enhanced metabolic activity when compared to naïve monocytes. Although β-glucan-primed cells expressed markers of alternative activation and secreted higher levels of IL-10 after lipopolysaccharide (LPS), their capability to release pro-inflammatory cytokines and to kill bacteria was unaffected. Our data demonstrate that β-glucan priming induces a population of immune competent long-lived monocyte-derived macrophages that may be involved in immunoregulatory processes.
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Affiliation(s)
- Julia Leonhardt
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Anesthesiology and Intensive Care Medicine, Jena University Hospital, Jena, Germany
| | - Silke Große
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Institute of Molecular Cell Biology, Center for Molecular Biomedicine, Jena University Hospital, Jena, Germany
| | - Christian Marx
- Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany
| | - Fatina Siwczak
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Institute of Biochemistry II, Jena University Hospital, Jena, Germany
| | - Sven Stengel
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Internal Medicine IV, Jena University Hospital, Jena, Germany
| | - Tony Bruns
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Internal Medicine IV, Jena University Hospital, Jena, Germany
| | - Reinhard Bauer
- Institute of Molecular Cell Biology, Center for Molecular Biomedicine, Jena University Hospital, Jena, Germany
| | - Michael Kiehntopf
- Institute of Clinical Chemistry and Laboratory Diagnostics Jena University Hospital, Jena, Germany
| | - David L Williams
- Department of Surgery and Center of Excellence in Inflammation, Infectious Disease and Immunity, Quillen College of Medicine, East Tennessee State University, Johnson City, TN, United States
| | - Zhao-Qi Wang
- Leibniz Institute on Aging, Fritz Lipmann Institute, Jena, Germany
| | - Alexander S Mosig
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Institute of Biochemistry II, Jena University Hospital, Jena, Germany
| | - Sebastian Weis
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Anesthesiology and Intensive Care Medicine, Jena University Hospital, Jena, Germany.,Center for Infectious Diseases and Infection Control, Jena University Hospital, Jena, Germany
| | - Michael Bauer
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Anesthesiology and Intensive Care Medicine, Jena University Hospital, Jena, Germany
| | - Regine Heller
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Institute of Molecular Cell Biology, Center for Molecular Biomedicine, Jena University Hospital, Jena, Germany
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