Effects of Human Urine on the Aggregation of Calcium Oxalate Crystals: Normal Persons Versus Stone-Formers

1985 ◽  
pp. 875-878 ◽  
Author(s):  
G. W. Drach ◽  
K. Springman ◽  
B. Gottung ◽  
A. Randolph
Keyword(s):  
Calcium Oxalate ◽  
Human Urine ◽  
Calcium Oxalate Crystals ◽  
Oxalate Crystals ◽  
Stone Formers

scholarly journals Effect of Dolichos biflorus Seeds Based Functional Beverage on In Vitro Calcium Oxalate Crystallization in Human Urine

2021 ◽  
Vol 12 (5) ◽  
pp. 5836-5844
Keyword(s):  
Antioxidant Activity ◽  
Calcium Oxalate ◽  
Human Urine ◽  
Crystallization Process ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Calcium Oxalate Crystals ◽  
Dolichos Biflorus ◽  
Oxalate Crystals

Calcium oxalate is the most common type of urolithiasis. The crystallization process includes nucleation, growth, and the aggregation of crystals. This study has used Dolichos biflorus seeds as a functional beverage to explore the role of its bioactive substances on the crystallization process of calcium oxalate in managing urolithiasis. A human urine model of in vitro calcium oxalate crystals was used in the study. Phytochemical screening of Functional beverage of Dolichos biflorus seeds was performed, and antioxidant activity was evaluated by measuring DPPH radical-scavenging activity, reducing power assay, and Hydrogen peroxide scavenging activity. Functional beverage of Dolichos biflorus seeds inhibited crystallization process by reducing aggregation of calcium oxalate crystals. The reduction in crystals aggregation helps prevent urolithiasis by keeping the crystals dispersed in the urine, controlling their size, and facilitating expulsion from the urinary tract. The results showed that the Functional beverage of Dolichos biflorus seeds has a significant quantity of flavonoids, glycosides, etc., and also possesses a significant antioxidant activity as evaluated by employing different antioxidant assays. Therefore, our findings suggested that the functional beverage of Dolichos biflorus seeds exhibited antiurolithiatic activity through inhibition of the crystallization process of the calcium oxalate process and significant antioxidant potential.

The Effect of Ethane-1-Hydroxy-1,1-Diphosphonate (EHDP) on Calcium Oxalate Crystalluria in Recurrent Renal Stone-Formers

1974 ◽  
Vol 47 (1) ◽  
pp. 13-22 ◽  
Author(s):  
W. G. Robertson ◽  
M. Peacock ◽  
R. W. Marshall ◽  
F. Knowles
Keyword(s):  
Calcium Oxalate ◽  
Stone Formation ◽  
Basal Diet ◽  
Sodium Oxalate ◽  
Calcium Oxalate Crystals ◽  
Calcium Oxalate Dihydrate ◽  
Calcium Oxalate Stone ◽  
Oxalate Crystals ◽  
Stone Formers

1. The volume, size and type of calcium oxalate crystals excreted in the urine of a group of patients with recurrent ‘idiopathic’ stones were studied on a controlled basal diet, after an oral supplement of sodium oxalate and after oral administration of ethane-1-hydroxy-1,1-diphosphonate (EHDP) for 4 weeks. 2. Before administration of EHDP the stone-formers passed the large crystals and aggregates of calcium oxalate dihydrate characteristic of recurrent calcium oxalate stone-formers. For the same level of urine saturation and crystalluria EHDP caused a significant reduction in the proportion of large crystals and aggregates excreted. Studies by light-microscopy confirmed that EHDP caused a striking change in the size and habit of calcium oxalate crystals in some but not all of the urine samples examined. 3. The decrease in average crystal size during the administration of EHDP was attributed to the observed increase in the ability of urine to inhibit the growth and aggregation of calcium oxalate crystals as measured by a growth system in vitro. 4. The possible use of EHDP as a therapeutic agent in the treatment of calcium oxalate stone-formation is discussed.

CYSTINE: A PROMOTER OF THE GROWTH AND AGGREGATION OF CALCIUM OXALATE CRYSTALS IN NORMAL UNDILUTED HUMAN URINE

2002 ◽  
Vol 167 (1) ◽  
pp. 317-321 ◽  
Author(s):  
MARIA C. MARTINS ◽  
ANTHONY A. MEYERS ◽  
NATALIE A. WHALLEY ◽  
ALLEN L. RODGERS
Keyword(s):  
Calcium Oxalate ◽  
Human Urine ◽  
Calcium Oxalate Crystals ◽  
Oxalate Crystals

Urate Does Not Influence the Formation of Calcium Oxalate Crystals in Whole Human Urine at pH 5·3

1982 ◽  
Vol 62 (4) ◽  
pp. 421-425 ◽  
Author(s):  
P. C. Hallson ◽  
G. A. Rose ◽  
S. Sulaiman
Keyword(s):  
Calcium Oxalate ◽  
Human Urine ◽  
Opposite Effect ◽  
Crystal Formation ◽  
Calcium Oxalate Crystals ◽  
Calcium Oxalate Crystal ◽  
Quantitative Microscopy ◽  
Calcium Oxalate Stones ◽  
Oxalate Crystals

1. Samples of fresh human urine were treated with immobilized uricase to lower urate concentration. Urate was added to yield low, normal and high urate samples. 2. Each sample was rapidly evaporated at pH 5.3 to standard osmolality and the yield of calcium oxalate crystals measured either by semi-quantitative microscopy or fully quantitative radioisotope techniques. 3. Increase of urinary urate did not increase the calcium oxalate crystals formed and may even have had an opposite effect. 4. Allantoin was without significant effect upon calcium oxalate crystal formation. 5. These data provide no support for the suggestion that reducing urate concentrations in the urine may be of value in treatment of patients with calcium oxalate stones.

Effect of Seed Crystals of Uric Acid and Monosodium Urate on the Crystallization of Calcium Oxalate in Undiluted Human Urine in Vitro

1997 ◽  
Vol 92 (2) ◽  
pp. 205-213 ◽  
Author(s):  
Phulwinder K. Grover ◽  
Rosemary L. Ryall
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Uric Acid ◽  
Calcium Oxalate ◽  
Human Urine ◽  
Monosodium Urate ◽  
Calcium Oxalate Crystals ◽  
Seed Crystals ◽  
Oxalate Crystals ◽  
Scanning Electron

1. The aim of this study was to determine whether seed crystals of uric acid or monosodium urate promote the epitaxial deposition of calcium oxalate in undiluted human urine. The effects of seed crystals of uric acid, monosodium urate or calcium oxalate on calcium oxalate crystallization induced in pooled 24-h urine samples collected from six healthy men were determined by [14C]oxalate deposition and Coulter counter particle analysis. The precipitated crystals were examined by scanning electron microscopy. 2. Seed crystals of uric acid, monosodium urate and calcium oxalate increased the precipitated particle volume in comparison with the control containing no seeds by 13.6%, 56.8% and 206.5% respectively, whereas the deposition of [14C]oxalate in these samples relative to the control was 1.4% (P < 0.05), 5.2% (P < 0.01) and 54% (P < 0.001) respectively. The crystalline particles deposited in the presence of monosodium urate seeds were smaller than those in the control samples. Scanning electron microscopy showed that large aggregates of calcium oxalate were formed in the presence of calcium oxalate seeds, which themselves were not visible. In contrast, monosodium urate and, to a lesser extent, uric acid seeds were scattered free on the membrane surfaces and attached like barnacles upon the surface of the calcium oxalate crystals. 3. It was concluded that seed crystals of monosodium urate and uric acid do not promote calcium oxalate deposition to a physiologically significant degree in urine. Howsever, binding of monosodium urate and uric acid crystals and their subsequent enclosure within actively growing calcium oxalate crystals might occur in vivo, thereby explaining the occurrence of mixed urate/oxalate stones.

Effects of Human Urine on Aggregation of Calcium Oxalate Crystals

1986 ◽  
Vol 135 (1) ◽  
pp. 69-71 ◽  
Author(s):  
Kurt E. Springmann ◽  
George W. Drach ◽  
Beth Gottung ◽  
Alan D. Randolph
Keyword(s):  
Calcium Oxalate ◽  
Human Urine ◽  
Calcium Oxalate Crystals ◽  
Oxalate Crystals

Calcium Oxalate Crystalluria and Inhibitors of Crystallization in Recurrent Renal Stone-Formers

1972 ◽  
Vol 43 (4) ◽  
pp. 499-506 ◽  
Author(s):  
W. G. Robertson ◽  
M. Peacock
Keyword(s):  
Calcium Oxalate ◽  
Stone Formation ◽  
Sodium Oxalate ◽  
Calcium Oxalate Crystals ◽  
Oxalate Crystals ◽  
Stone Formers ◽  
Large Particles ◽  
Recurrent Stone ◽  
Recurrent Stone Formers

1. The particle size distributions of calcium oxalate crystals were measured at 37°C in fresh urine from recurrent, idiopathic stone-formers and their controls under the same conditions of dietary and fluid intake. The crystals excreted by the controls were small and belonged to a unimodal distribution, whereas those excreted by the stone-formers belonged to a distribution which contained a second peak of much larger particles. The proportion of large crystals in the urines of the stone-formers was significantly higher than in the urines of the controls. 2. The difference in the proportion of large particles passed by the two groups was accentuated by adding a small quantity of sodium oxalate to their diets. Whereas the controls continued to excrete only small crystals of calcium oxalate, the stone-formers passed most of their crystals as large particles. 3. Further investigations showed that the urines of the controls contained a potent inhibitor of the growth and aggregation of calcium oxalate crystals in vitro and that the inhibitor was deficient in the urines of the recurrent stone-formers. 4. It is suggested that the inhibitor in normal urine may allow calcium oxalate to be passed harmlessly in the form of small particles, whereas the lower inhibitory activity in the urines of the recurrent stone-formers is insufficient to prevent the growth of the primary crystals into the large aggregates seen in these urines. By blocking the formation of abnormally large crystals and aggregates the inhibitor may therefore play an important role in preventing crystalluria leading to stone formation.

The Urinary F1 Activation Peptide of Human Prothrombin is a Potent Inhibitor of Calcium Oxalate Crystallization in Undiluted Human Urine in Vitro

1995 ◽  
Vol 89 (5) ◽  
pp. 533-541 ◽  
Author(s):  
Rosemary L. Ryall ◽  
Phulwinder K. Grover ◽  
Alan M. F. Stapleton ◽  
Dianne K. Barrell ◽  
Yulu Tang ◽  
...  
Keyword(s):  
Calcium Oxalate ◽  
Human Urine ◽  
Stone Formation ◽  
Calcium Oxalate Crystals ◽  
Particle Volume ◽  
Calcium Oxalate Crystallization ◽  
Oxalate Crystals ◽  
Activation Peptide ◽  
Dose Dependent Decrease

1. The urinary F1 activation peptide of prothrombin is the predominant protein incorporated into calcium oxalate crystals precipitated from human urine. The aim of this study was to examine the effect of pure urinary prothrombin F1 on calcium oxalate crystallization in human urine. 2. Urinary prothrombin F1 was purified from demineralized calcium oxalate crystals precipitated from human urine, and its effects on calcium oxalate crystallization induced by addition of an oxalate load were tested in undiluted, ultrafiltered urine from healthy men, at final concentrations of 0 to 10 mg/l. 3. Urinary prothrombin F1 did not affect the amount of oxalate required to induce crystallization, but the volume of material deposited increased in proportion to increasing concentrations of urinary prothrombin F1. However, the mean particle size decreased in reverse order: this was confirmed by scanning electron microscopy, which showed it to be the result of a reduction in crystal aggregation rather than in the size of individual crystals. Analysis of 14C-oxalate data revealed a dose-dependent decrease in calcium oxalate deposition with an increase in urinary prothrombin F1 concentration, indicating that the increase in particle volume recorded by the Coulter Counter resulted from inclusion of urinary prothrombin F1 into the crystalline architecture, rather than increased deposition of calcium oxalate. 4. It was concluded that urinary prothrombin F1 may be an important macromolecular determinant of stone formation.

Sign in / Sign up

Export Citation Format

Share Document