Biochemical characterization of renal epithelial cell cultures (LLC-PK1 and MDCK).
The expression of enzymes in LLC-PK1 and MDCK cells was used to study the retention of differentiated properties of the renal epithelial cell lines by a biochemical approach. Activities of marker enzymes, for which intracellular and intranephron localization is known, were determined from crude cell homogenates of LLC-PK1 and MDCK monolayer cultures. The activity patterns of the particular enzymes found were then compared with the in vivo distribution of the enzymes along the rat nephron. LLC-PK1 cells exhibit high activities of apical membrane enzymes when compared with MDCK cells, whereas in the latter high activity of Na-K-ATPase could be detected. The activities of lysosomal enzymes, mitochondrial enzymes, and transaminases were higher in LLC-PK1 than in MDCK cells. Glycolytic enzymes, however, displayed identical activity levels in both the LLC-PK1 and MDCK cells, which may be due to the fact that these are continuous cell lines and to the culture conditions used, since glucose is a major energy source in the culture media.
D000818:Animals; D002460:Cell Line; D002462:Cell Membrane / Q000201:enzymology; D005947:Glucose / Q000378:metabolism; D007668:Kidney / Q000166:cytology / Q000201:enzymology*; D008247:Lysosomes / Q000201:enzymology; D008830:Microbodies / Q000201:enzymology; D008928:Mitochondria / Q000201:enzymology; D051381:Rats; D000637:Transaminases / Q000378:metabolism
D000637:Transaminases; D005947:Glucose