Proteomic analysis of serum, outflow dialysate and adsorbed protein onto dialysis membranes (polysulfone and pmma) during hemodialysis treatment using SELDI-TOF-MS.
OBJECTIVE
Alterations in the profiling of peptides and proteins in the serum, outflow dialysate and adsorbed protein on the dialysis membrane were investigated.


METHODS
Alterations in the protein profiling of routine hemodialysis using polysulfone (TS-UL) and PMMA (moderate flux membrane of polymethylmethacrylate: BK-U) in 8 patients and that of adsorption onto polysulfone and PMMA membranes in 4 patients were evaluated by SELDI-TOF-MS and ProteinChip array. Mass-to-charge ratios (m/z) between 2,000 and 120,000 were analyzed.


RESULTS
The protein with a relative intensity of m/z 11,730 measured by SELDI-TOF-MS was present in a small amount in the outflow dialysate and in a large amount in adsorption (identified as beta2-microglobulin) onto PMMA membrane. Unexpectedly, 68 molecular masses of peptides that were adsorbed more onto polysulfone than onto PMMA membrane were observed. There were more peptides less than m/z 11,730 adsorbed onto polysulfone membrane than onto PMMA membrane. Dominant peaks, m/z 6,629 and 6,431 adsorbed onto polysulfone membrane were identified as apolipoprotein CI and truncated apolipoprotein CI, respectively. 37 proteins with molecular weights larger than m/z 11,730 showed greater filtration through PMMA membrane than through polysulfone membrane. 149 molecular masses that were adsorbed onto PMMA or more onto PMMA membrane than onto polysulfone membrane were observed.


CONCLUSIONS
This experiment suggests that membrane adsorption is an important mechanism for the removal of middle-molecular-weight proteins by hemodialysis using not only PMMA membrane but also polysulfone membrane. Adsorption of peptide or protein onto a dialysis membrane may depend not only on the membrane material, but also on the peptide or protein.
Ishikawa
Isao
I
Division of Nephrology, Department of Internal Medicine, Dialysis Center, Asanogawa General Hospital, Kanazawa, Ishikawa, Japan. isikawai@kanazawa-med.ac.jp
Chikazawa
Yoshihiro
Y
Sato
Kazumasa
K
Nakagawa
Masaru
M
Imamura
Hidetsugu
H
Hayama
Satoshi
S
Yamaya
Hideki
H
Asaka
Mitsuhiro
M
Tomosugi
Naohisa
N
Yokoyama
Hitoshi
H
Matsumoto
Keiji
K
D000327:Adsorption; D001798:Blood Proteins / Q000032:analysis*; D005260:Female; D015312:Hemodialysis Solutions / Q000737:chemistry*; D006801:Humans; D008297:Male; D008567:Membranes, Artificial; D008875:Middle Aged; D011108:Polymers / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D011485:Protein Binding; D020543:Proteome / Q000032:analysis*; D006435:Renal Dialysis; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013450:Sulfones / Q000737:chemistry*
D001798:Blood Proteins; D015312:Hemodialysis Solutions; D008567:Membranes, Artificial; D011108:Polymers; D020543:Proteome; D013450:Sulfones; C017662:polysulfone P 1700; D019904:Polymethyl Methacrylate