Ultrapure dialysate reduces plasma levels of beta2-microglobulin and pentosidine in hemodialysis patients.
BACKGROUND
beta2-Microglobulin (beta2MG) and carbonyl stress are reported to contribute to the development of dialysis-related amyloidosis. The aim of this study was to determine whether the purity of dialysate affects plasma levels of beta2MG and pentosidine (a surrogate marker of carbonyl stress) in hemodialysis patients.


METHODS
Sixteen patients on hemodialysis with a polysulfone membrane participated in this study. We switched the dialysate from conventional dialysate (endotoxin level 0.055-0.066 endotoxin units (EU)/ml) to ultrapure dialysate (endotoxin level <0.001 EU/ml), followed patients for 6 months, and then switched back to conventional dialysate once again. Plasma levels of beta2MG, pentosidine, CRP and interleukin-6 (IL-6) were determined before the switch to ultrapure dialysate, 1 and 6 months after the switch to ultrapure dialysate, and 1 month after the switch back to conventional dialysate.


RESULTS
The switch from conventional to ultrapure dialysate significantly decreased plasma levels of beta2MG, from 30.1 +/- 1.4 to 27.1 +/- 1.4 mg/dl (p < 0.05) and pentosidine, from 1,535.8 +/- 107.5 to 1,267.6 +/- 102.9 nmol/l (p < 0.01) after 1 month of use. The change of dialysate also significantly decreased plasma levels of CRP, from 0.28 +/- 0.09 to 0.14 +/- 0.05 mg/dl (p < 0.05) and IL-6, from 9.4 +/- 2.7 to 3.5 +/- 0.8 pg/ml (p < 0.01) over the 1-month period. These changes in plasma levels of beta2MG, pentosidine, CRP and IL-6 were maintained over 6 months after switching to ultrapure dialysate and returned to basal levels by switching back to a conventional dialysate.


CONCLUSIONS
Ultrapure dialysate decreases plasma levels of beta2MG, pentosidine and inflammatory markers in hemodialysis patients. The use of ultrapure dialysate might be useful in preventing and/or treating complications of dialysis, such as dialysis-related amyloidosis, atherosclerosis and malnutrition.
Furuya
Ryuichi
R
Renal Division, Department of Internal Medicine, Iwata City Hospital, Iwata, Japan.
Kumagai
Hiromichi
H
Takahashi
Masaaki
M
Sano
Koji
K
Hishida
Akira
A
D000368:Aged; D000686:Amyloidosis / Q000517:prevention & control; D001120:Arginine / Q000031:analogs & derivatives* / Q000097:blood; D002097:C-Reactive Protein / Q000378:metabolism; D004731:Endotoxins / Q000032:analysis; D005260:Female; D015312:Hemodialysis Solutions / Q000592:standards*; D006801:Humans; D015850:Interleukin-6 / Q000097:blood; D007676:Kidney Failure, Chronic / Q000097:blood / Q000628:therapy*; D008239:Lysine / Q000031:analogs & derivatives* / Q000097:blood; D008297:Male; D008875:Middle Aged; D006435:Renal Dialysis / Q000009:adverse effects; D001613:beta 2-Microglobulin / Q000097:blood*
D004731:Endotoxins; D015312:Hemodialysis Solutions; D015850:Interleukin-6; D001613:beta 2-Microglobulin; D002097:C-Reactive Protein; D001120:Arginine; C062187:pentosidine; D008239:Lysine