Abstract：
OBJECTIVES:To determine why the incidence of pediatric urolithiasis is less than that of adult urolithiasis, we investigated the difference in inhibition of calcium oxalate (CaOX) crystallization between pediatric and adult urinary macromolecules (UMMs). METHODS:Urinary parameters in relation to urolithiasis, the inhibition of CaOX crystallization of original urine and urine from which UMMs (greater than 3 kDa) had been removed, and the inhibition of CaOX crystal growth and aggregation of UMMs alone were measured. These inhibitory activities were compared between children and adults. RESULTS:In the original urine, the inhibition of CaOX crystallization was significantly stronger for children than for adults, but was the same in urine from which the UMMs had been removed. The inhibition of CaOX crystal growth by UMMs alone showed no significant differences between children and adults; their inhibition of CaOX crystal aggregation was significantly stronger for children than for adults. Much more glycosaminoglycan (GAG) was included in pediatric UMMs than in adult UMMs, although there was no difference in UMM concentration between urine from children and urine from adults. CONCLUSIONS:The lower incidence of CaOX lithiasis in children may be attributed, among other factors, to the stronger inhibition of CaOX crystal aggregation by pediatric UMMs, which in turn might be affected by the higher concentration of GAGs in children's urine.
journal_name
Urologyjournal_title
Urologyauthors
Miyake O,Yoshimura K,Tsujihata M,Yoshioka T,Koide T,Takahara S,Okuyama Adoi
10.1016/s0090-4295(99)00004-7subject
Has Abstractpub_date
1999-06-01 00:00:00pages
1229-34issue
6eissn
0090-4295issn
1527-9995pii
S0090429599000047journal_volume
53pub_type
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