Abstract:
:The rat organic anion transporter 3 (rOAT3) has recently been identified as the third isoform of the OAT family. The mechanisms that regulate rOAT3's functions remain to be elucidated. rOAT3 contributes for moving a number of negatively charged organic compounds between cells and their extracellular milieu. Caveolin (Cav) also plays a role as a membrane transporter. To address the relationship of these two proteins, we investigated the protein-protein interaction between rOAT3 and Cav-1. The rOAT3 mRNA and protein expression were observed in the rat kidney, and the expressions of Cav-1 mRNA and protein were also detected in the kidney. Confocal microscopy of the immuno-cytochemistry experiments using primary cultured renal proximal tubular cells showed that rOAT3 and Cav-1 were co-localized at the plasma membrane. This finding was confirmed by Western blot analysis using isolated caveolae-enriched membrane fractions from the rat kidney and immuno-precipitation experimentation. When rOAT3's synthesized cRNA of rOAT3 along with the antisense oligo deoxynucleotide ofXenopusCav-1 were co-injected intoXenopusoocytes, the [(3)H] estrone sulfate uptake was significantly decreased. These findings suggest that rOAT3 and caveolin-1 share a cellular expression in the plasma membrane and Cav-1 up-regulates the organic anionic compound uptake via rOAT3 under normal physiological conditions.
journal_name
IUBMB Lifejournal_title
IUBMB lifeauthors
Kwak JO,Kim HW,Song JH,Kim MJ,Park HS,Hyun DK,Kim DS,Cha SHdoi
10.1080/15216540500104750keywords:
subject
Has Abstractpub_date
2005-02-01 00:00:00pages
109-17issue
2eissn
1521-6543issn
1521-6551pii
K25462L0Q0886624journal_volume
57pub_type
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