Abstract
While β-hemolytic streptococcus (β-HS) infections are known to predispose patients to acute poststreptococcal glomerulonephritis, there is evidence that implicates α-hemolytic streptococcus (α-HS) in IgA nephropathy (IgAN). The alternative pathway of the complement system has also been implicated in IgAN. We aimed to explore the association between α-HS and complement activation in human tonsillar mononuclear cells (TMCs) in IgAN. In our study, α-HS induced higher IgA levels than IgG levels, while β-HS increased higher IgG levels than IgA levels with more activation-induced cytidine deaminase, in TMCs in the IgAN group. Aberrant IgA1 O-glycosylation levels were higher in IgAN patients with α-HS. C3 and C3b expression was decreased in IgAN patients, but in chronic tonsillitis control patients, the expression decreased only after stimulation with β-HS. Complement factor B and H (CFH) mRNA increased, but the CFH concentration in culture supernatants decreased with α-HS. The percentage of CD19 + CD35 + cells/complement receptor 1 (CR1) decreased with α-HS more than with β-HS, while CD19 + CD21 + cells/complement receptor 2 (CR2) increased more with β-HS than with α-HS. The component nephritis-associated plasmin receptor (NAPlr) of α-HS was not detected on tonsillar or kidney tissues in IgAN patients and was positive on cultured TMCs and mesangial cells. We concluded that α-HS induced the secretion of aberrantly O-glycosylated IgA while decreasing the levels of the inhibitory factor CFH in culture supernatants and CR1 + B cells. These findings provide testable mechanisms that relate α-HS infection to abnormal mucosal responses involving the alternative complement pathway in IgAN.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- TMCs:
-
Tonsillar mononuclear cells
- α-HS:
-
α-Hemolytic streptococcus
- β-HS:
-
β-Hemolytic streptococcus
- IgAN:
-
IgA nephropathy
- CT:
-
Chronic tonsillitis
- AID:
-
Activation-induced cytidine deaminase
- CFH:
-
Complement factor H
- CR1:
-
Complement receptor 1
- CR2:
-
Complement receptor 2
- NAPlr:
-
Nephritis-associated plasmin receptor
- APSGN:
-
Acute poststreptococcal glomerulonephritis
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- SEM:
-
Standard error of the mean
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Funding
This work was supported by the National Natural Science Foundation of China (NSFC): 81770714, 81470947, and 81373227.
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HL, YP, and MY contributed to the design and conception of the study. MY, ChW, LL, and QZh performed the experiments. MY and ChW analyzed the data. MY wrote the paper. HL and YP provided financial support. All authors have read and approved the manuscript.
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The procedures were performed in accordance with the Clinical Ethics Committee at the Second Xiangya Hospital of Central South University and with the Declaration of Helsinki. Written informed consent was obtained from all participants. Ethics approval number: 2015 S061.
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Ye, M., Wang, C., Li, L. et al. The influences of α-hemolytic Streptococcus on class switching and complement activation of human tonsillar cells in IgA nephropathy. Immunol Res 70, 86–96 (2022). https://doi.org/10.1007/s12026-021-09223-2
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DOI: https://doi.org/10.1007/s12026-021-09223-2