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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Renal+Physiol
2014 ; 307
(1
): F1-F11
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pH-responsive, gluconeogenic renal epithelial LLC-PK1-FBPase+cells: a versatile
in vitro model to study renal proximal tubule metabolism and function
#MMPMID24808535
Curthoys NP
; Gstraunthaler G
Am J Physiol Renal Physiol
2014[Jul]; 307
(1
): F1-F11
PMID24808535
show ga
Ammoniagenesis and gluconeogenesis are prominent metabolic features of the renal
proximal convoluted tubule that contribute to maintenance of systemic acid-base
homeostasis. Molecular analysis of the mechanisms that mediate the coordinate
regulation of the two pathways required development of a cell line that
recapitulates these features in vitro. By adapting porcine renal epithelial
LLC-PK1 cells to essentially glucose-free medium, a gluconeogenic subline, termed
LLC-PK1-FBPase(+) cells, was isolated. LLC-PK1-FBPase(+) cells grow in the
absence of hexoses and pentoses and exhibit enhanced oxidative metabolism and
increased levels of phosphate-dependent glutaminase. The cells also express
significant levels of the key gluconeogenic enzymes, fructose-1,6-bisphosphatase
(FBPase) and phosphoenolpyruvate carboxykinase (PEPCK). Thus the altered
phenotype of LLC-PK1-FBPase(+) cells is pleiotropic. Most importantly, when
transferred to medium that mimics a pronounced metabolic acidosis (9 mM HCO3 (-),
pH 6.9), the LLC-PK1-FBPase(+) cells exhibit a gradual increase in NH4 (+) ion
production, accompanied by increases in glutaminase and cytosolic PEPCK mRNA
levels and proteins. Therefore, the LLC-PK1-FBPase(+) cells retained in culture
many of the metabolic pathways and pH-responsive adaptations characteristic of
renal proximal tubules. The molecular mechanisms that mediate enhanced expression
of the glutaminase and PEPCK in LLC-PK1-FBPase(+) cells have been extensively
reviewed. The present review describes novel properties of this unique cell line
and summarizes the molecular mechanisms that have been defined more recently
using LLC-PK1-FBPase(+) cells to model the renal proximal tubule. It also
identifies future studies that could be performed using these cells.