ISSN:
1434-0879
Keywords:
Key words LLC-PK1
;
Water transport
;
Oxalate Stone salts
;
; Nephrolithiasis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract LLC-PK1 cells were cultured on a permeable support in a two-compartment culture system. Confluent monolayers received an ultrafiltrate-like solution at the apical side and a plasma-like solution at the basolateral side. The distribution of various solutes, including phosphate, calcium, and oxalate over both compartments was measured in time. The transport of water was monitored by alterations in fluid concentrations of radiolabeled inulin. Bicarbonate, glucose, and phosphate were transported rapidly from the apical to basolateral side of the monolayer. Sodium and chloride were reabsorbed without major consequences for the osmolality in the apical and basal fluid. Calcium and potassium were also reabsorbed, but to a smaller extent than sodium. The luminal concentration of oxalate gradually increased to values that were at least three times higher (12.0 ± 0.4 μmol/l) than those in the contraluminal fluid (3.8 ± 0.1 μmol/l). However, since the luminal rise of oxalate completely matched the rise of inulin in the apical fluid this appeared to be the passive consequence of active water reabsorption rather than of net directed oxalate transport. The LLC-PK1 model could prove useful to study the regulation of proximal tubule water transport and its effect on luminal stone salt concentrations under different physiological conditions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002400050096
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