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- Title
CTLA-4 Polymorphisms in Patients with IgA Nephropathy Correlate with Proteinuria.
- Authors
Jacob, Marius; Ohl, Kim; Goodarzi, Tannaz; Harendza, Sigrid; Eggermann, Thomas; Fitzner, Christina; Hilgers, Ralf-Dieter; Bolte, Anna; Floege, Jürgen; Rauen, Thomas; Tenbrock, Klaus
- Abstract
<bold><italic>Background/Aims:</italic></bold> IgA nephropathy (IgAN) is the most common form of primary glomerulonephritis and still constitutes one of the most important causes of end-stage renal disease. Abnormal T cell responses may play a role in IgAN pathogenesis. Co-stimulatory molecules such as cytotoxic T lymphocyte-associated antigen 4 (CTLA-4) are important for naive T cells to initiate and terminate immune responses. Single nucleotide polymorphisms (SNPs) in the CTLA4 gene locus are associated with several autoimmune diseases. <bold><italic>Methods:</italic></bold> We aimed to investigate the occurrence of the SNPs -318C/T, +49A/G and CT60 G/A within the CTLA4 locus in healthy blood donors (n=455) and IgAN patients (n=252) recruited from the recently published STOP-IgAN trial. The presence of these SNPs was then associated with baseline proteinuria in IgAN patients. <bold><italic>Results:</italic></bold> We observed a significantly increased frequency of the CTLA4 -318C/T genotype in IgAN patients as compared to controls (CC vs. CT+TT: OR 1.65, 95%-CI 1.03-2.65, p=0.035). No significant associations, neither with the +49A/G nor for the CT60 G/A SNP, were detected. However, when we stratified for proteinuria at time of inclusion into the STOP-IgAN trial (<1 g/day vs. >1 g/day), we observed significant differences in the frequencies of the CT60 G/A genotype, i.e. a significantly increased risk for higher proteinuria in patients carrying the G allele (OR 2.81, 95%-CI 1.03-7.64, p=0.042). <bold><italic>Conclusion:</italic></bold> The CTLA4 -318/C/T SNP was associated with an increased risk to develop IgAN, while the CT60 G/A genotype significantly associated with the risk for higher proteinuria suggesting a possible role for CTLA-4 in IgAN.
- Subjects
PROTEINURIA; SINGLE nucleotide polymorphisms; DIABETIC nephropathies; CYTOTOXIC T lymphocyte-associated molecule-4; NEPHROTIC syndrome
- Publication
Kidney & Blood Pressure Research, 2018, Vol 43, Issue 2, p360
- ISSN
1420-4096
- Publication type
Article
- DOI
10.1159/000488069