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Kyrklund M, Kaski H, Akhi R, Nissinen AE, Kummu O, Bergmann U, Pussinen P, Hörkkö S, Wang C. Existence of natural mouse IgG mAbs recognising epitopes shared by malondialdehyde acetaldehyde adducts and Porphyromonas gingivalis. Innate Immun 2021; 27:158-169. [PMID: 33445998 PMCID: PMC7882809 DOI: 10.1177/1753425920981133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Natural Abs are produced by B lymphocytes in the absence of external Ag stimulation. They recognise self, altered self and foreign Ags, comprising an important first-line defence against invading pathogens and serving as innate recognition receptors for tissue homeostasis. Natural IgG Abs have been found in newborns and uninfected individuals. Yet, their physiological role remains unclear. Previously, no natural IgG Abs to oxidation-specific epitopes have been reported. Here, we show the cloning and characterisation of mouse IgG mAbs against malondialdehyde acetaldehyde (MAA)-modified low-density lipoprotein. Sequence analysis reveals high homology with germline genes, suggesting that they are natural. Further investigation shows that the MAA-specific natural IgG Abs cross-react with the major periodontal pathogen Porphyromonas gingivalis and recognise its principle virulence factors gingipain Kgp and long fimbriae. The study provides evidence that natural IgGs may play an important role in innate immune defence and in regulation of tissue homeostasis by recognising and removing invading pathogens and/or modified self-Ags, thus being involved in the development of periodontitis and atherosclerosis.
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MESH Headings
- Acetaldehyde/chemistry
- Acetaldehyde/metabolism
- Animals
- Antibodies, Monoclonal/isolation & purification
- Antibodies, Monoclonal/metabolism
- Clone Cells
- Epitopes, B-Lymphocyte/metabolism
- Fimbriae Proteins/metabolism
- Gingipain Cysteine Endopeptidases/metabolism
- Immunity, Innate
- Immunoglobulin G/isolation & purification
- Immunoglobulin G/metabolism
- Lipoproteins, LDL/chemistry
- Lipoproteins, LDL/metabolism
- Malondialdehyde/chemistry
- Malondialdehyde/metabolism
- Mice
- Mice, Knockout
- Oxidation-Reduction
- Periodontitis/immunology
- Porphyromonas gingivalis/physiology
- Receptors, LDL/genetics
- Receptors, Pattern Recognition/isolation & purification
- Receptors, Pattern Recognition/metabolism
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Affiliation(s)
- Mikael Kyrklund
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
- Medical Research Centre and Nordlab Oulu, University Hospital and University of Oulu, Finland
| | - Heidi Kaski
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
| | - Ramin Akhi
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
- Medical Research Centre and Nordlab Oulu, University Hospital and University of Oulu, Finland
| | - Antti E Nissinen
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
- Medical Research Centre and Nordlab Oulu, University Hospital and University of Oulu, Finland
| | - Outi Kummu
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
- Medical Research Centre and Nordlab Oulu, University Hospital and University of Oulu, Finland
| | - Ulrich Bergmann
- Protein Analysis Core Facility, Biocentre Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Finland
| | - Pirkko Pussinen
- Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Finland
| | - Sohvi Hörkkö
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
- Medical Research Centre and Nordlab Oulu, University Hospital and University of Oulu, Finland
| | - Chunguang Wang
- Medical Microbiology and Immunology, Research Unit of Biomedicine, Faculty of Medicine, University of Oulu, Finland
- Medical Research Centre and Nordlab Oulu, University Hospital and University of Oulu, Finland
- Minerva Foundation Institute for Medical Research, Biomedicum Helsinki 2U, Finland
- Chunguang Wang, Cardiovascular Research Unit, Minerva Foundation Institute for Medical Research, Biomedicum Helsinki 2U, Tukholmankatu 8, Helsinki 00290, Finland.
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