Abstract
Background
IgA nephropathy (IgAN) is the most common primary chronic glomerulonephritis; however, its precise initiating pathogenesis remains unclear. Streptococcus mutans is a major pathogen of human dental caries. S. mutans strains with the cnm gene encoding Cnm, a collagen-binding protein, have been reported to contribute to the development of systemic diseases. However, the contribution of S. mutans with Cnm in the development of IgAN has not been reported. The aim of this study was to investigate the prevalence of cnm-positive S. mutans in IgAN patients and clarify the effects of cnm-positive S. mutans on the histological pathology of IgAN.
Methods
We identified the cnm gene in S. mutans isolated in saliva specimens, which were collected from IgAN patients (n = 53) and control subjects (n = 50). We evaluated the collagen-binding properties of S. mutans in IgAN patients and controls. The clinical parameters and histological scores were also assessed in IgAN patients.
Results
The rates of S. mutans isolation in IgAN and control groups were 84.0 and 84.9 %, respectively, not significantly dfferent. cnm-positive strains were significantly more prevalent in the IgAN group than in controls (32.1 vs. 14.0 %, p < 0.05). With regard to collagen-binding assays, the binding rates of cnm-positive strains were significantly higher in the IgAN group than in controls (96.6 vs. 30.0, p < 0.05). In addition, the segmental glomerulosclerosis scores were significantly higher in cnm-positive patients with IgAN than in cnm-negative patients with IgAN (0.94 vs. 0.57, p < 0.05).
Conclusion
cnm-positive S. mutans strains are potentially associated with the pathogenesis of IgAN.
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Acknowledgments
The authors thank Prof. Howard K. Kuramitsu, State University of New York at Buffalo, for editing the manuscript. This study was supported by Osaka University Graduate School of Dentistry.
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The authors state that they have no conflict of interest (COI).
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Misaki, T., Naka, S., Kuroda, K. et al. Distribution of Streptococcus mutans strains with collagen-binding proteins in the oral cavity of IgA nephropathy patients. Clin Exp Nephrol 19, 844–850 (2015). https://doi.org/10.1007/s10157-014-1072-0
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DOI: https://doi.org/10.1007/s10157-014-1072-0