Linked Life Data

16611857

Source:http://linkedlifedata.com/resource/pubmed/id/16611857

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
2006-6-22
pubmed:abstractText
Telmisartan, a nonpeptide angiotensin II receptor antagonist, is selectively distributed to liver. In the present study, we have characterized the contribution of organic anion transporting polypeptide (OATP) isoforms to the hepatic uptake of telmisartan by isolated rat hepatocytes, human cryopreserved hepatocytes, and human transporter-expressing cells. Because it is difficult to evaluate the transport activity of telmisartan because of its extensive adsorption to cells and culture materials, we performed the uptake study in the presence of human serum albumin. The saturable uptake of telmisartan into isolated rat hepatocytes took place in a Na(+)-independent manner and was inhibited by pravastatin, taurocholate, and digoxin, which are Oatp substrates and inhibitors, but not by organic cation, tetraethylammonium, indicating the involvement of Oatp isoforms in its uptake into rat hepatocytes. To identify which human OATP transporters are important for the hepatic uptake of telmisartan, the uptake assay was carried out using OATP1B1- and OATP1B3-expressing human embryonic kidney 293 cells and cryopreserved human hepatocytes. The uptake of telmisartan by OATP1B3-expressing cells was saturable (K(m) = 0.81 microM) and significantly higher than that by vector-transfected cells. In contrast, no significant uptake was observed in OATP1B1-expressing cells. We also observed the saturable uptake of telmisartan by human hepatocytes. Thirty micromolar estrone-3-sulfate, which can selectively inhibit OATP1B1-mediated uptake compared with OATP1B3, did not inhibit the uptake of telmisartan in human hepatocytes, whereas it could inhibit the uptake of estradiol 17beta-d-glucuronide mediated by OATP1B1. These results suggest that OATP1B3 is predominantly involved in the hepatic uptake of telmisartan in humans.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Angiotensin II Type 1 Receptor..., http://linkedlifedata.com/resource/pubmed/chemical/Benzimidazoles, http://linkedlifedata.com/resource/pubmed/chemical/Benzoates, http://linkedlifedata.com/resource/pubmed/chemical/Estradiol, http://linkedlifedata.com/resource/pubmed/chemical/Estrone, http://linkedlifedata.com/resource/pubmed/chemical/Organic Anion Transporters, http://linkedlifedata.com/resource/pubmed/chemical/Organic Anion Transporters..., http://linkedlifedata.com/resource/pubmed/chemical/SLCO1B1 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/SLCO1B3 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Serum Albumin, http://linkedlifedata.com/resource/pubmed/chemical/Sincalide, http://linkedlifedata.com/resource/pubmed/chemical/estradiol-17 beta-glucuronide, http://linkedlifedata.com/resource/pubmed/chemical/estrone sulfate, http://linkedlifedata.com/resource/pubmed/chemical/telmisartan
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0090-9556
pubmed:author
pubmed:issnType
Print
pubmed:volume
34
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1109-15
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Predominant contribution of OATP1B3 to the hepatic uptake of telmisartan, an angiotensin II receptor antagonist, in humans.
pubmed:affiliation
Department of Pharmacokinetics and Non-Clinical Safety, Kawanishi Pharma Research Institute, Nippon Boehringer Ingelheim Co., Ltd., Hyogo, Japan.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't