Simplified estimates of ion-activity products of calcium oxalate and calcium phosphate in mouse urine

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dc.contributor.authorTiselius, Hans-Goran
dc.contributor.authorNogueira Ferraz, Renato Ribeiro [UNIFESP]
dc.contributor.authorHeilberg, Ita Pfeferman [UNIFESP]
dc.contributor.institutionKarolinska Inst
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2016-01-24T14:27:30Z
dc.date.available2016-01-24T14:27:30Z
dc.date.issued2012-08-01
dc.description.abstractThis study aimed at formulating simplified estimates of ion-activity products of calcium oxalate (AP(CaOx)) and calcium phosphate (AP(CaP)) in mouse urineto find the most important determinants in order to limit the analytical work-up. Literature data on mouse urine composition was used to determine the relative effect of each urine variable on the two ion-activity products. AP(CaOx) and AP(CaP) were calculated by iterative approximation with the EQUIL2 computerized program. the most important determinants for AP(CaOx) were calcium, oxalate and citrate and for AP(CaP) calcium, phosphate, citrate, magnesium and pH. Urine concentrations of the variables were used. A simplified estimate of AP(CaOx) (AP(CaOx)-index(MOUSE)) that numerically approximately corresponded to 10(8) x AP(CaOx) was given the following expression:AP(CaOx)-index(MOUSE) = 0.70 x Calcium(1.05) x Oxalate(0.95)(0.90-0.0225 x Citrate) + (6.6 x 10(-8) x Citrate(3.98))For a series of urine samples with various composition the coefficient of correlation between AP(CaOx)-index(MOUSE) and 10(8) x AP(CaOx) was 0.99 (p = 0.00000). A similar estimate of AP(CaP) (AP(CaP)-index(MOUSE)) was formulated so that it approximately would correspond numerically to 10(14) x AP(CaP) taking the following form:Ap(CaP)-index(MOUSE) = 0.05 x Calcium(1.17) x Phosphate(0.85) x Magnesium(0.18) x (pH - 4.5)(6.8) / Citrate(0.76)For a series of variations in urine composition the coefficient of correlation was 0.95 (p = 0.00000). the two approximate estimates shown in this article are simplified expressions of AP(CaOx) and AP(CaP). the intention of these theoretical calculations was not to get methods for accurate information on the saturation levels in urine, but to have mathematical tools useful for rough conclusions on the outcome of different experimental situations in mice. It needs to be emphasized that the accuracy will be negatively influenced if urine variables not included in the formulas differ very much from basic concentrations.en
dc.description.affiliationKarolinska Inst, Dept Clin Sci Intervent & Technol, Div Urol, Stockholm, Sweden
dc.description.affiliationUniversidade Federal de São Paulo, Div Nephrol, São Paulo, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Div Nephrol, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.format.extent285-291
dc.identifierhttp://dx.doi.org/10.1007/s00240-011-0443-1
dc.identifier.citationUrological Research. New York: Springer, v. 40, n. 4, p. 285-291, 2012.
dc.identifier.doi10.1007/s00240-011-0443-1
dc.identifier.issn0300-5623
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/35118
dc.identifier.wosWOS:000306439900002
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofUrological Research
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dc.subjectMouseen
dc.subjectUrine concentrationsen
dc.subjectCalcium oxalateen
dc.subjectCalcium phosphateen
dc.subjectIon-activity productsen
dc.subjectEQUIL2en
dc.subjectTheoretical calculationsen
dc.subjectCitrateen
dc.subjectPhosphateen
dc.subjectpHen
dc.titleSimplified estimates of ion-activity products of calcium oxalate and calcium phosphate in mouse urineen
dc.typeinfo:eu-repo/semantics/article
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