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Organic anion transporter and gene coding for the same

a technology of organic anion transporter and gene, applied in the field of genes and their encoding polypeptides, can solve the problems of limitations in the previous techniques for precise analysis of organic anion transpor

Inactive Publication Date: 2006-03-16
FUJI BIOMEDIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide new genes and their products that are involved in the kidneys' transport of organic anions. The technical effects of this invention include the discovery of new genes and their functions in the kidneys' transport of organic anions, which can help in the development of new treatments for kidney-related diseases.

Problems solved by technology

There are, however, limitations in the previous techniques for precise analysis of the organic anions transport, such as the networks of transport between different transporters and the drug-drug interaction against a single molecule.

Method used

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  • Organic anion transporter and gene coding for the same
  • Organic anion transporter and gene coding for the same
  • Organic anion transporter and gene coding for the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Cloning of rat Organic Anion Transporter

(1) cDNA Cloning of Rat Sodium-Dicarboxylate Co-Transporter (rNaDC-1), and the Preparation of rNaDC-1 cRNA

[0057] A non-directional cDNA library was prepared from rat kidney poly(A)+ RNA using commercially available kit (Superscript Choice system, GIBCO BRL) and was ligated to λZipLox EcoRI arms (GIBCO BRL). A PCR product corresponding to nucleotides 1323 1763 of the rabbit sodium dicarboxylate transporter (NaDC-1) (Pajor, A. M. (1995) J. Biol. Chem. 270, 5779-5785 ) was labeled with 32P-dCTP. A rat cDNA library was screened with this probe at low stringency. Hybridization was done overnight in the hybridization solution at 37° C. and filters were washed finally at 37° C. in 0.1×SSC / 0.1% SDS. The hybridization solution contains 5×SSC, 3×Denhardt's solution, 0.2% SDS, 10% dextran sulfate, 50% formamide, 0.01% Antifoam B, 0.2 mg / ml denatured salmon sperm DNA, 2.5 mM sodium pyrophosphate and 25 mM MES, pH 6.5. cDNA inserts in positive λZipLox p...

example 2

Functional Characterization of Organic Anion Transporter 1 (OAT1)

(1) The Effect of the Preincubation of Glutarate on the Transport Activity of OAT1

[0077] The effect of the preincubation of glutarate was investigated in the uptake experiment using the oocytes expressed with OAT1.

[0078] The uptake experiment using PAH was performed as described in the methods of EXAMPLE 1-(2). Oocytes injected with rat OAT1 cRNA only, or both rat OAT1 and rNaDC-1 cRNA were incubated in the ND96 solution containing 14C-PAH for 1 hour after preincubated them in the ND96 solution with and without 1 mM of glutarate.

[0079]FIG. 5 shows the dependence of OAT 1-mediated 14C-PAH uptake on the intracellular dicarboxylate (glutarate) concentration. The rate of 14C-PAH uptake by oocytes via OAT1 is increased by preincubation of the oocytes with 1 mM glutarate. When oocytes co-expressing rNaDC-1 and OAT1 are preincubated with glutarate, hey showed a further increase in the rate of 14C-PAH uptake. This trans-s...

example 3

Cloning of the Human Organic Anion Transporter

[0091] Using rat OAT1 cDNA obtained in EXAMPLE 1-(2), human cDNA library was screened. Human cDNA library was constructed from human kidney poly (A)+ RNA (Clontech).

[0092] Sequence of the isolated cDNA clone (human OAT1 cDNA) was determined according to the methods described in Example 1. The coding region of the human OAT1 cDNA and the deduce amino acid sequence was determined as well.

[0093] The sequence of human OAT1 in both nucleotide and amino acid level is shown in the SEQ ID NO 2.

[0094] The sequence homology between rat OAT1 and human OAT1 was approximately 85% and 79%, in amino acid level and nucleotide level, respectively.

Industrial Applicability

[0095] The present invention, organic anion transporter 1 (OAT1) and the gene encoding OAT1 , is considered to be useful to clarify the molecular mechanisms underlying the pharmacokinetics and toxicokinetics, such as the drug elimination and drug-drug interaction. In addition, the s...

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Abstract

A protein capable of transporting organic anions having amino acid sequences represented by SEQ ID NO: 1 or 2 or amino acid sequences derived therefrom by deletion, substitution or addition of one or more amino acid residues; and a gene coding for the protein. The protein and gene therefor are useful in vitro analysis of drug release and drug-drug interactions and development of methods for screening drugs useful for preventing nephrotoxicity.

Description

TECHNICAL FIELD [0001] The present invention is related to the genes and their encoding polypeptides, which are related to the transport of organic anions. BACKGROUND ART [0002] The kidney plays important roles in the excretion of endogenous compounds and xenobiotics. Anionic substances including drugs are excreted via carrier-mediated pathway(s) into the urine. The first step of this secretion is the uptake of organic anion from the peritubular plasma across the basolateral membrane of the proximal tubule cells. [0003] The basolateral uptake of the organic anions has been studied using several techniques, such as perfusion of excised kidney, or membrane vesicles of isolated tubule cells. In these studies, para-aminohippurate (PAH) has been widely used as a test substrate. During these studies, it has been supposed that the organic anion transporter responsible for the basolateral uptake of organic anions was an organic anion / dicarboxylate exchanger. [0004] There are, however, limit...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07K14/705C07H21/04C12P21/06C07K14/47C12N15/12
CPCC07K14/47
Inventor ENDOU, HITOSHIKANAI, YOSHIKATSUSEKINE, TAKASHIHOSOYAMADA, MAKOTO
Owner FUJI BIOMEDIX
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