Calcium phosphate crystal formation in Escherichia coli from human urine: An in vitro study

M. S. Cohen, C. P. Davis, E. W. Czerwinski, M. M. Warren

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Escherichia coli with no demonstrable urease activity was inoculated into filter sterilized urine obtained from a healthy volunteer subject with no history of stone disease and then incubated at 37C. Bacteria were recovered at intervals between 1 and 10 days. Urinary pH was stable as compared to control urines and spontaneous crystal precipitation was not noted in controls. Recovered organisms were analyzed by x-ray powder diffractometry. An uncharacterized mineral phase (UMP) was first evident after 6 days. Calcium phosphate in the form of brushite and hydroxyapatite was apparent at 7 and 10 days respectively. This suggests a role for bacteria in calcium phosphate crystal formation in urine apart from urease activity and may contribute to the calcium phosphate component of urinary calculi.

Original languageEnglish (US)
Pages (from-to)184-185
Number of pages2
JournalJournal of Urology
Volume127
Issue number1
DOIs
StatePublished - 1982
Externally publishedYes

ASJC Scopus subject areas

  • Urology

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