Diabetes Care, Vol 19, Issue 10 1103-1107, Copyright © 1996 by American Diabetes Association
LDL apheresis reduces the susceptibility of LDL to in vitro oxidation in a diabetic patient with hemodialysis treatment
I Inoue, K Takahashi, C Kikuchi and S Katayama
Fourth Department of Internal Medicine, Saitama Medical School, Japan.
OBJECTIVE: We studied whether LDL apheresis would alter the susceptibility
of LDL to in vitro oxidative modification induced by copper ion in a
diabetic patient undergoing hemodialysis treatment. RESEARCH DESIGN AND
METHODS: Isolated LDL was dialyzed against phosphate-buffered saline and
resuspended at a concentration of 0.3 mg cholesterol mass/ml buffer LDL
oxidation was then initiated by addition of 1.66 mumol/l CuSO4, and the
formation of conjugated dienes was continuously monitored
spectrophotometrically at 234 nm. RESULTS: The duration of the lag phase of
LDL obtained after LDL apheresis was markedly longer than that of LDL
obtained before LDL apheresis. The propagation rate and the maximum
conjugated diene formation of LDL oxidation were not changed after LDL
apheresis. CONCLUSIONS: A LDL subfraction that was susceptible to oxidation
was removed by LDL apheresis, resulting in reduction of susceptibility of
LDL to in vitro oxidation remaining in plasma. LDL apheresis may be of
clinical importance for preventing atherosclerotic disease in diabetic
patients undergoing hemodialysis.