K. Suzuki et R. Tsugawa, ANALYSIS OF GLYCOSAMINOGLYCANS INDUCED IN NEWLY FORMED CALCIUM-OXALATE CRYSTALS USING AN UNDILUTED URINE SYSTEM, Scanning microscopy, 9(4), 1995, pp. 1089-1096
The aim of this study was to examine the effect of sodium pentosan pol
ysulfate (SPP) in an undiluted urine system and to study its relative
affinity to calcium oxalate (CaOx) crystals in the presence or absence
of heparan sulfate (HS). CaOx crystals were induced with an overload
of oxalate above the metastable limit in spun and filtered urine (SF)
and ultrafiltered urine (UF). Then, the crystals were dissolved with E
DTA (ethylenediaminetetraacetic acid), electrodialysed and lyophilized
. The polyanions, HS or SPP were added to the UF prior to the addition
of oxalate. Polyanions in crystal matrices were examined by cellulose
acetate electrophoresis. Crystal volume and size were suppressed acco
rding to the increase of the concentration of SPP when compared with t
hose of the UF. Scanning electron microscopy (SEM) showed marked aggre
gation of the crystals in the UF and no aggregation in the presence of
SPP. HS was the only polyanion found in CaOx crystals formed after ov
erload of oxalate in SF. Crystals formed in UF did not contain any pol
yanions. When SPP was added to UF, SPP appeared in the crystal matrix
in accordance with its concentration. Once HS in physiological concent
ration was added to the UF containing SPP, HS and SPP obtained from cr
ystals were strongly stained with Alcian blue in electrophoretic study
, where SPP is stained stronger than HS. These results suggest that SP
P strongly binds to CaOx crystals as well as HS and that HS and SPP co
mpetitively bind to the crystal, then, as a result, they are incorpora
ted into the crystals. The fact that SPP suppressed the aggregation of
CaOx crystals in undiluted urine showed the possibility that SPP migh
t be one of the useful drugs for preventing CaOx urolithiasis.