Genetic analysis of interleukin-10 promoter region in patients with systemic lupus erythematosus in Taiwan.
Overproduction of interleukin-10 (IL-10) may play an important role in the development of systemic lupus erythematosus (SLE) or lupus nephritis. There is also a polymorphic dinucleotide repeat in the human IL-10 promoter region (IL-10PR). Our aim was to study whether or not the IL-10PR alleles contributed to the susceptibility to SLE or lupus nephritis. One hundred SLE patients and 103 healthy controls were studied for IL-10PR by PCR and electrophoretic analysis. The distribution of IL-10PR alleles, genotypes and the sum of both alleles (SBA) from different groups or subgroups were analyzed. SLE patients showed no difference in the distribution of IL-10PR alleles, genotypes and SBA, as compared to healthy controls. Lupus nephritis patients (N = 49) also showed no difference in IL-10PR alleles, genotypes and SBA, as compared to SLE patients without nephritis (N = 51). Of 49 lupus nephritis patients, ten developed end-stage renal disease (ESRD) and four of them were found to suffer from rapid progressive renal failure (RPRF). Patients with RPRF presented much smaller SBA than other ESRD patients (p = 0.005). Lupus nephritis patients carrying small SBA (< 18) suffered from a higher prevalence of RPRF than lupus nephritis patients without small SBA (50% V.S. 0%, p < 0.001, relative risk 82). Our data provide the first evidence of a strong association between IL-10PR and severe progression of lupus nephritis in human patients. In the future, a prospective genetic analysis of IL-10PR for patients with lupus nephritis is recommended. It might be helpful for physicians to identify the lupus nephritis subgroup with a high risk of developing RPRF early, because this might lead to a better therapy and prognosis for these patients.
Ou
T T
TT
Department of Internal Medicine, Chung-Ho Memorial Hospital, Kaohsiung, Republic of China.
Tsai
W C
WC
Chen
C J
CJ
Chang
J G
JG
Yen
J H
JH
Wang
W S
WS
Lin
C H
CH
Tsai
J J
JJ
Liu
H W
HW
D000328:Adult; D000368:Aged; D005260:Female; D005838:Genotype; D006801:Humans; D016753:Interleukin-10 / Q000235:genetics*; D007676:Kidney Failure, Chronic / Q000235:genetics; D008180:Lupus Erythematosus, Systemic / Q000235:genetics*; D008181:Lupus Nephritis / Q000235:genetics; D008297:Male; D008875:Middle Aged; D011401:Promoter Regions, Genetic
D016753:Interleukin-10