Intact MDCK cells and their membrane fragments significantly inhibited COM crystal growth (22.6% and 25.2% decreases in size, respectively) and significantly reduced COM total crystal mass (23.1% and 25.6% decreases, respectively).
In contrast, both of them markedly promoted crystal aggregation (1.9-fold and
3.2-fold increases, respectively).
Moreover, both intact cells and membrane fragments could transform
COM to calcium oxalate dihydrate (COD) crystals. Finally, COM crystal growth inhibitory activities of both membrane forms were successfully confirmed by a spectrophotometric oxalate-depletion assay.
Our data provide the first direct evidence to demonstrate the dual modulatory effects of MDCK membranes on COM crystals.
Although growth of individual COM crystals was inhibited, their aggregation
was promoted.
These findings provide additional insights into the mechanisms of COM kidney stone
formation.
Intact MDCK cells and their membrane fragments significantly inhibited COM crystal growth (22.6% and 25.2% decreases in size, respectively) and significantly reduced COM total crystal mass (23.1% and 25.6% decreases, respectively). In contrast, both of them markedly promoted crystal aggregation (1.9-fold and3.2-fold increases, respectively). Moreover, both intact cells and membrane fragments could transformCOM to calcium oxalate dihydrate (COD) crystals. Finally, COM crystal growth inhibitory activities of both membrane forms were successfully confirmed by a spectrophotometric oxalate-depletion assay.Our data provide the first direct evidence to demonstrate the dual modulatory effects of MDCK membranes on COM crystals. Although growth of individual COM crystals was inhibited, their aggregationwas promoted. These findings provide additional insights into the mechanisms of COM kidney stoneformation.
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