Evidence map›Paper›PMID 21278621›Full record

ArticlePharmacogenetics and genomics2011

Identification of novel functional organic anion-transporting polypeptide 1B3 polymorphisms and assessment of substrate specificity.

Ute I Schwarz, Henriette E Meyer zu Schwabedissen, Rommel G Tirona, Atsuko Suzuki, Brenda F Leake, Younes Mokrab, Kenji Mizuguchi, Richard H Ho, Richard B Kim

Abstract read
In one paragraph

Article in Pharmacogenetics and genomics, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.

0numbers the graph read from it
0cells of the map it votes in
35citing papers in PubMed
3.5field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

35 citing papers in PubMed, 89 citations in OpenAlex.

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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

9 authors at 6 institutions in 4 countries.

Ute I SchwarzDivision of Clinical Pharmacology, Department of Medicine, University of Western Ontario, Canada.
Henriette E Meyer zu Schwabedissen
Rommel G Tirona
Atsuko Suzuki
Brenda F Leake
Younes Mokrab
Kenji Mizuguchi
Richard H Ho
Richard B Kim
Western University · CANational Institute of Biomedical Innovation, Health and Nutrition · JPSuzuki (Japan) · JPTohoku University · JPUniversity of Cambridge · GBVanderbilt University · US

Funding

HEPATIC DRUG TRANSPORTERS IN DRUG DISPOSITIONR01GM054724 · NIGMS · VANDERBILT UNIVERSITY · PI RODEN, DAN M · 1998 to 2006
$2.2M
MRP2, BSEP, and BCRP Transporter Polymorphisms and Chemotherapy DispositionK08GM081363 · NIGMS · VANDERBILT UNIVERSITY · PI HO, RICHARD HSINSHIN · 2007 to 2011
$706k
HEPATIC DRUG TRANSPORTERS IN DRUG DISPOSITIONR55GM054724 · NIGMS · VANDERBILT UNIVERSITY · PI KIM, RICHARD B · 1997 to 1997
–
CIHR MOP-89753NIGMS NIH HHS GM54724NIGMS NIH HHS GM81363NIGMS NIH HHS K08 GM081363NIGMS NIH HHS R01 GM054724
6 · The paper itself

Abstract

objectiveThe uptake carrier organic anion-transporting polypeptide 1B3 (OATP1B3, gene SLCO1B3) is involved in the hepatic clearance of xenobiotics including statins, taxanes, and mycophenolic acid. We thought to assess the SLCO1B3 coding region for yet unidentified polymorphisms and to analyze their functional relevance.

methodsWe used DNA of ethnically diverse individuals for polymerase chain reaction, and determined polymorphisms by sequencing or temperature-dependent capillary electrophoresis. We then created variant OATP1B3 expression plasmids by site-directed mutagenesis, which were transiently expressed and functionally characterized in human cervical carcinoma (HeLa) cells using radiolabeled substrates.

resultsWe identified six nonsynonymous polymorphisms including novel variants such as 439A>G (Thr147Ala), 767G>C (Gly256Ala), 1559A>C (His520Pro), and 1679T>C (Val560Ala). Allelic frequencies occurred to be ethnicity-dependent, with the latter observed only in African-Americans (3.6%). After expression in HeLa cells, His520Pro, Val560Ala, and Met233Ile or Met233Ile_Ser112Ala haplotype variants showed decreased uptake activity compared with wild type for cholecystokinin-8 and rosuvastatin, but not for atorvastatin. Kinetic cholecystokinin-8 analysis showed reduced Vmax without altering Km. His520Pro and Val560Ala exhibited decreased total and plasma membrane protein expressions. Val560 mapped onto a structural model of OATP1B3 showed that this is a key region for substrate-transporter interaction. His520 resides in a predicted extracellular region thought to be critical to the pH-dependent component of OATP1B3 activity. Loss of activity at pH 7.4 and 8.0 relative to pH 6.5 was significantly greater for the Pro520 variant.

conclusionOATP1B3 polymorphisms that result in altered expression, substrate specificity, and pH-dependent activity may be of potential relevance to hepatic clearance of substrate drugs in vivo.

Indexed as

Amino Acid SequenceAmino Acid SubstitutionAtorvastatinFluorobenzenesGene ExpressionHeLa CellsHeptanoic AcidsHumansHydroxymethylglutaryl-CoA Reductase InhibitorsLiverMolecular Sequence DataMutagenesis, Site-DirectedOrganic Anion Transporters, Sodium-IndependentPolymorphism, GeneticProtein ConformationPyrimidinesAtorvastatinFluorobenzenesHeptanoic AcidsHydroxymethylglutaryl-CoA Reductase InhibitorsOrganic Anion Transporters, Sodium-IndependentPyrimidinesPyrrolesRosuvastatin CalciumSincalideSLCO1B3 protein, humanSolute Carrier Organic Anion Transporter Family Member 1B3Sulfonamides

Identifiers

PMID21278621
PMCPMC3044558
OpenAlexW2012727770

What OpenQuestion holds

Textmetadata
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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.