Complement in patients receiving maintenance hemodialysis: functional screening and quantitative analysis.
BACKGROUND
The complement system is vital for innate immunity and is implicated in the pathogenesis of inflammatory diseases and the mechanism of host defense. Complement deficiencies occasionally cause life-threatening diseases. In hemodialysis (HD) patients, profiles on complement functional activity and deficiency are still obscure. The objectives of the present study were to measure the functional complement activities of the classical pathway (CP), lectin pathway (LP) and alternative pathway (AP) using a novel method and consequently to elucidate the rates of deficiencies among HD patients.


METHODS
In the present study, 244 HD patients at one dialysis center and 204 healthy controls were enrolled. Functional complement activities were measured simultaneously using the Wielisa®-kit. The combination of the results of these three pathway activities allows us to speculate which candidate complement is deficient; subsequently, the deficient complement was determined.


RESULTS
All three functional complement activities were significantly higher in the HD patients than in the control group (P < 0.01 for all cases). After identifying candidates in both groups with complement deficiencies using the Wielisa®-kit, 16 sera (8.8%) with mannose-binding lectin (MBL) deficiency, 1 serum (0.4%) with C4 deficiency, 1 serum (0.4%) with C9 deficiency, and 1 serum (0.4%) with B deficiency were observed in the HD group, and 18 sera (8.8%) with MBL deficiency and 1 serum (0.5%) with B deficiency were observed in the control group. There were no significant differences in the 5-year mortality rate between each complement-deficient group and the complement-sufficient group among the HD patients.


CONCLUSIONS
This is the first report that profiles complement deficiencies by simultaneous measurement of functional activities of the three complement pathways in HD patients. Hemodialysis patients frequently suffer from infections or malignancies, but functional complement deficiencies do not confer additional risk of mortality.
Division of Nephrology, Department of Internal Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan.
Hiroyuki
H
Inoshita
Isao
I
Ohsawa
Gaku
G
Kusaba
Masaya
M
Ishii
Kisara
K
Onda
Satoshi
S
Horikoshi
Hiroyuki
H
Ohi
Yasuhiko
Y
Tomino
D003167:Complement Activation / Q000235:genetics / Q000276:immunology*; D003165:Complement System Proteins / Q000172:deficiency / Q000378:metabolism / Q000502:physiology*; D006801:Humans; D008403:Mass Screening / Q000379:methods; D011446:Prospective Studies; D006435:Renal Dialysis / Q000379:methods
D003165:Complement System Proteins