Abstract:
:Studies have shown that the renal tubular epithelium adapts to alterations in the sulfur amino acid composition of the diet. The renal adaptive response has been described in man, mouse, rat, dog, and pig. The observed phenomenon involves increased or decreased initial rate activity of the NaCl-dependent taurine transporter at the brush border membrane surface of the proximal tubule following dietary manipulation of taurine. A cDNA encoding a taurine transporter has been isolated from LLC-PK1 cells, designated pTAUT, and its functional properties have been examined in Xenopus laevis oocytes. The nucleotide sequence of the clone predicts a 621-amino acid protein with about 90% homology to other cloned taurine transporter cDNAs. When expressed in oocytes the transporter displays a Km of 25 microM and is dependent on the presence of external sodium and chloride, characteristics similar to taurine uptake by LLC-PK1 cells. The abundance of pTAUT mRNA and protein were up-regulated in cells cultured in taurine-free medium as compared with cells cultured in medium containing 500 microM taurine. Activation of PKC by PMA had no effect on adaptive regulation of pTAUT mRNA and protein, indicating that down-regulation of LLC-PK1 cell taurine transport activity by PMA occurs at the post-translational level.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Han X,Budreau AM,Chesney RWdoi
10.1007/978-1-4899-0117-0_33subject
Has Abstractpub_date
1998-01-01 00:00:00pages
261-8eissn
0065-2598issn
2214-8019journal_volume
442pub_type
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