WO2004086036A1 - Abcタンパク質と相互作用する物質のスクリーニング方法 - Google Patents
Abcタンパク質と相互作用する物質のスクリーニング方法 Download PDFInfo
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- WO2004086036A1 WO2004086036A1 PCT/JP2004/004093 JP2004004093W WO2004086036A1 WO 2004086036 A1 WO2004086036 A1 WO 2004086036A1 JP 2004004093 W JP2004004093 W JP 2004004093W WO 2004086036 A1 WO2004086036 A1 WO 2004086036A1
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- abc
- protein
- abc protein
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6872—Intracellular protein regulatory factors and their receptors, e.g. including ion channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
- B01L3/5025—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures for parallel transport of multiple samples
- B01L3/50255—Multi-well filtration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2500/00—Screening for compounds of potential therapeutic value
- G01N2500/02—Screening involving studying the effect of compounds C on the interaction between interacting molecules A and B (e.g. A = enzyme and B = substrate for A, or A = receptor and B = ligand for the receptor)
Definitions
- the present invention relates to a method for screening a substance that interacts with an ABC (ATP Binding Cassette) protein (ABC transposer), a method for measuring the transporter viability of an ABC protein, and a method for screening these substances.
- the present invention relates to a kit for measuring the transporter activity of ABC protein, which can be advantageously used for the measurement method.
- Cells maintain their cell functions by transporting ions and nutrients and excreting waste and toxins through the membranes of organelles such as the plasma membrane, endoplasmic reticulum, and mitochondria.
- the transport of these substances is selectively carried out by membrane transport proteins called channels and transporters.
- membrane transport proteins called channels and transporters.
- ABC protein eg, CF Higgins, Ann. Rev. Cell Biol. , 8, 67 (1992)
- ABC proteins are differentiated into a variety of functions, such as trans-transport, channels, and receptors (regi-yu-re-ichi), and play important physiological functions in each organism, all of which have similar secondary structures.
- the ABC protein is one of the largest gene families distributed in a wide variety of organisms, from bacteria to yeast, plants and mammals. More than 50 ABC evenings are currently in humans
- the ABC protein has also been referred to as the ABC transposer since the protein genes have been identified and most of these proteins are involved in active transport of molecules across membranes.
- APC proteins convert the energy of ATP hydrolysis into structural changes in protein molecules, which in turn couple drugs to and from the cell, resulting in a pharmacokinetic profile of the drug (absorption, Distribution, metabolism, excretion, and effective concentration of the drug at the target site), and is also said to affect the overall pharmacological effect of the drug. For example, it is expressed in small intestinal epithelial cells and cerebrovascular endothelial cells These ABC transporters greatly affect the bioavailability of orally administered drugs and drug transfer to the central nervous system. It is also said that abnormalities in the ABC protein gene are associated with diseases, and it has been revealed that abnormalities in the ABC protein cause various diseases, especially in humans. Its importance as a mechanism is being understood. For example, overexpression of P-glycoprotein (MDR1) or MRP1 belonging to the ABC protein family makes cancer cells resistant by excreting many anticancer drugs out of the cell. Well-known in the field of therapy
- the mechanism by which the ABC protein transports a drug as a transporter through the cell membrane is considered as follows.
- the ABC protein is present in the membrane across both sides of the cell membrane (inside and outside of the cell).
- a new ATP molecule binds to the ABC protein from the inside of the cell, and this ATP is decomposed into ADP and phosphate, and the energy is released, and this energy causes deformation in (2) above. The shape of the recovered ABC protein is restored.
- At-Pase activity of P-glycoprotein when the substrate is added to the membrane where P-glycoprotein is expressed has been attracting the most attention among the ABC transporters.
- the method of measuring the amount is used by many pharmaceutical companies. Specifically, in the above cycle, ATP binds to ABC protein due to the presence of the drug to be transported in step (2) above, and is decomposed into ADP. By measuring the ADP in a state in which the APC has been removed, a drug recognized by the ABC protein can be detected. Therefore, by labeling ATP and measuring the labeled ABC protein (ie, the ABC protein to which the labeled ADP is bound), the drug or inhibitor transported by the ABC protein can be detected. can do.
- the advantages of this method include the extremely low cost of reagents and the ability to process large amounts of samples.
- it is practically difficult to measure labeled ABC proteins because the transport system is rotating and in a dynamic state.
- the background may be slightly higher due to the intrinsic ATPase activity of the membrane itself, and the sensitivity is relatively low because the amount of decomposition of the phosphate concentration is measured. Therefore, as an alternative to the technique for measuring the ATPase activity described above, Atssey applying the vanadate method was devised.
- the vanadate method is a method that has been reported in papers since 1995, and when the ABC transporter decomposes ATP, the phosphate ion is replaced by vanadate.
- the membrane protein and ABC protein are released from the cell membrane, the released ABC protein is separated from other proteins by electrophoresis, and the label (i.e., Labeled ADP) was measured.
- the label i.e., Labeled ADP
- the present inventors have developed a method for screening a substrate for an ABC-binding cassette (ABC) protein, wherein a cell membrane fraction expressing the ABC protein, labeled ATP and vanadic acid, Mixing and incubating the sample, adding the mixture to a support on which an antibody against the ABC protein is immobilized, or mixing and incubating a labeling reagent and a test sample on the support; and
- a screening method for ABC protein substrates that measures immobilized label or non-immobilized label was proposed (see International Publication No. WO 02 / 52,622, pamphlet).
- the cell membrane fraction expressing the ABC transporter was bound to a support (for example, a 96-well microphone plate) via an antibody and bound to the ABC transporter [ 32].
- a support for example, a 96-well microphone plate
- ADP [P] ATP
- a substrate or an inhibitor for the ABC transporter can be screened very efficiently, and application to high throughput screening is possible.
- the cell membrane fraction expressing the ABC transposer after immobilization to the support via the antibody has unstable physiological activity, and can be adsorbed per 1 ⁇ l.
- the amount of the cell membrane fraction was limited, and the reproducibility of the experimental data was inconvenient. For this reason, it was necessary to construct a more practical experimental system capable of stable data analysis.
- the present inventors have conducted intensive research to solve the above-mentioned problems, and have made improvements to the existing vanadate method (see International Publication No. WO 02/052 262 pamphlet) by the present inventors.
- a reaction buffer containing vanadic acid and [ 3 H] ATP pre-incubation is performed, and then the test compound is added and reacted.
- the reaction solution was added to a 96-well type glass filter, and the amount of [ 3 H] ADP adsorbed on the P-glycoprotein-expressing membrane in one step was measured using the suction washing method. Even when samples are used, data fluctuation is small and reproducibility is good, and many samples can be measured simultaneously and easily. And found that the present invention was completed. Disclosure of the invention
- the present invention provides a method for substituting a membrane fraction in which an ABC (ATP Binding Cassette) protein is expressed, a labeled nucleoside triphosphate or a derivative thereof, and a phosphate ion of the nucleoside triphosphate or a derivative thereof.
- ABC ATP Binding Cassette
- a method for screening for a substance that interacts with ABC protein which comprises the step of measuring the labeling of ABC (claim 1); 2.
- Claim 2 or the method for screening a substance that interacts with the ABC protein according to Claim 1 or 2, wherein the nucleoside diphosphate immobilized substance is vanadic acid.
- a beta C evening protein that interacts with substances (claim 6), characterized in that the, A The membrane fraction expressing the BC protein is a mammalian or insect cell membrane fraction expressing the ABC protein, and interacts with the ABC protein according to any one of claims 1 to 6.
- a method for screening a substance that interacts with the C protein (Claim 8), and wherein the substance that interacts with the ABC protein is an inhibitor of the ABC protein.
- AB CE Subfamily 10 A method for screening a substance that interacts with an ABC protein according to any one of claims 1 to 9, wherein the method is a human ABC protein belonging to L., AB CF subfamily or ABCG subfamily. (Claim 10).
- the present invention provides a membrane fraction in which an ABC (ATP Binding Cassette) protein is expressed, a labeled nucleoside triphosphate or a derivative thereof, and a phosphate ion of the nucleoside triphosphate or a derivative thereof.
- ABC ATP Binding Cassette
- kits for measuring the transporter activity of ABC protein (claim 11), characterized in that it has a filter and a filter that can be filtered and separated by suction filtration and Z or centrifugal filtration means.
- the kit according to claim 1 or 2 wherein the substance is vanadic acid, and the kit for measuring transport activity of the ABC protein according to claim 1 or claim 2 or the nucleoside triphosphate is ATP.
- the kit for measuring the activity of ABC protein for transport according to any one of claims 11 to 13 (claim 14), and the label is a radioactive label, a fluorescent label, or an optical label.
- the membrane fraction is the mammalian or insect cell membrane fraction in which ABC protein is expressed.
- the kit for measuring the transporter activity of ABC protein according to any one of claims 11 to 16 (Claim 17), and a substance that interacts with ABC protein is ABCC.
- the present invention provides a membrane fraction in which an ABC (ATP Binding Cassette) protein is expressed, a labeled nucleoside triphosphate or a derivative thereof, A nucleoside diphosphate immobilizing substance that forms a complex with nucleoside diphosphoric acid by substituting the phosphate ion of nucleoside triphosphate or a derivative thereof and maintains the binding between nucleoside diphosphoric acid and membrane protein; A step of contacting the protein with a substrate; washing the membrane fraction in which the membrane protein is expressed with a washing solution; and filtering at least unreacted labeled nucleoside triphosphate or a derivative thereof through a filter. And a method for measuring the label on the filter and / or the label in the filtrate (claim 21).
- FIG. 1 shows that when verapamil was added to the P-glycoprotein-expressing membrane ( ⁇ : P_gpZV er. (+)), Verapamil was not added to the P-glycoprotein-expressing membrane ( ⁇ : P-gp / Ver. (1)), when verapamil was added to the Sf9 control membrane (Country: Contro1 / Ver. (+)), And when verapamil was not added to the Sf9 control membrane
- FIG. 4 is a diagram showing the time course of [ 3 H] ATP binding activity when ( ⁇ : Contro 1 ZVer. (+)).
- Fig. 2 shows the amount of the P-glycoprotein-expressing membrane used, and shows the results when verapamil was added to 5 itg, 2.5 g or 1 g of the P-glycoprotein-expressing membrane (Verapami 1 (+)) Or a diagram showing the change in [ 3 H] ATP binding activity when not added (Verapami 1 (1)).
- FIG. 3 is a graph showing the concentration dependence of verapamil on P-glycoprotein.
- Fig. 4 shows the binding activity of various test substances to P-glycoprotein. It is.
- FIG. 5 is a diagram showing the examination results of the washing conditions.
- a combination of the washing with the reaction buffer A and the blocking method with the PVP (Buf.A + PVP), and the washing with the reaction buffer A (Buf. A) shows the results of studies on the combination of washing with PBS and the blocking method with PVP (PBS + PVP), and washing with PBS (PBS).
- FIG. 6 shows A; j6-estradiol-17- ( ⁇ -didalcuronide) and ;; human MR ⁇ 2 expressing Sf9 membrane by vanadet method when sulfobromophthalein was added.
- FIG. 3 is a view showing the results of measuring the amount of [ 3 H] ADP binding to OH.
- a membrane fraction expressing the ABC protein, a labeled nucleoside triphosphate or a derivative thereof, and a nucleoside triphosphate or a derivative thereof are used.
- a membrane fraction in which the ABC protein is expressed As a method for measuring the transporter activity of the ABC protein, a membrane fraction in which the ABC protein is expressed, a labeled nucleoside triphosphate or a derivative thereof, and a phosphate ion of the nucleoside triphosphate or a derivative thereof are used.
- a nucleoside diphosphoric acid To form a complex with nucleoside diphosphoric acid
- a nucleoside diphosphate immobilizing substance which forms and maintains the binding of nucleoside diphosphate to the membrane protein, with a substrate of the ABC protein; and a membrane fraction in which the membrane protein is expressed.
- the method is not particularly limited as long as it is a method, and the kit for measuring the activity of the ABC protein transposon overnight includes a membrane fraction expressing the ABC protein, a label The nucleoside triphosphate or its derivative and the phosphate ion of the nucleoside triphosphate or its derivative to form a complex with nucleoside diphosphate And a nucleoside diphosphate immobilizing substance that maintains the binding between nucleoside diphosphate and membrane protein, and a filter that filters and separates at least unreacted labeled nucleoside triphosphate or a derivative thereof.
- the measurement kit There is no particular limitation on the measurement kit.
- the ABC protein transports substances and controls channels, driven by the energy obtained by the hydrolysis of ATP.
- ABC protein has a characteristic ATP-binding site, and its primary structure is well preserved across ABC proteins, across species, and throughout evolution.
- the ATP binding site of the ABC protein has a conserved amino acid residue sequence as compared with the primary structure of the transmembrane portion and the like.
- Rev. Walker A and Walker B motifs (Walker, JE, Saraste, ⁇ , Runswick, MJ, Gay, NJ (1982) EMBO J 1, 945-941) and ABCs ignature motifs (Higgins, CF (1992) Annu. Rev. Cell Biol. 8, 67-113) exists almost exclusively as an amino acid residue sequence common to its ATP binding site.
- the ABC protein refers to the WalkerA motif (Gly-XX- Gly-X-Gly ⁇ Lys-Ser- [Ser, Thr, Gin] (SEQ ID NO: 1) and WalkerB motif ([Leu, He, Phe]-[Ile, Leu, Val] -X-Asp- [Glu , Asp, Ser]) (SEQ ID NO: 2) and the following ABC signature motif ([Leu, He, Val, Met, Phe, Tyr, Cys]-[Ser, Ala]-[Ser, Ala, Pro, Gly, Leu, Val, Phe, Tyr, Lys, Gin, His) -Gly- [Asp, Glu, Asn, Gin, Met, Trp]-[Lys, Arg, Gin, Ala, Ser, Pro, Cys , Leu, lie, Met, Phe, Trp]-[Lys, Arg, Asn, Gin, Ser, Thr, Ala, Val, Met]-[Leu, lie, Met, P
- ABC proteins include ABCA1 (also known as ABC1, TGD, HDLDT1), ABCA2 (also known as ABC2), and ABCA3 (also known as ABC3, ABCC, CEST1). 1 1 6 5 3), AB CA4 (alias ST GD I, RP 19, FFM, ST GD), AB CA 5 (alias EST 9 0 6 2 5), ABCA 6 (alias EST 1 5 5 0 5 1) , AB CA 7, AB CA 8, AB CA 9, AB CA 10 (alias EST 6 9 8 7 3 9), ABCA 1 1 (alias EST 1 1 3 3 5 3 0), ABCA 1 2 (DKF ZP 4 Human ABC protein belonging to the ABCA subfamily (also known as ABC1 subfamily) such as 34 G232) or ABCB1 (also known as MDR1, P—gp, PGY1); TAP1 (also known as PSF1) , ING 4, D 6 S 1 1 4 E), TAP 2 (also known as PSF 2, RING 11, D 6 S 2 17 E)
- AB CB 7 (alias EST 14 0 5 3 5, A tm 1, ABC 7), AB CB 8 (alias EST 3 2 8 1 2 8, M— AB C l), AB CB 9 (alias EST 1 2 2 2 3 4), ABCB 10 (alias EST 2 0 2 3 7), AB CB 1 0 P (alias M—AB C 2, M AB C 2) , AB CB 1 1 (also known as SP GP, PFIC-2, BSEP, P GY 4.) and other human ABC proteins belonging to the AB CB subfamily (also known as MDRZTAP subfamily 1), and AB CC 1 (also known as MR P 1, MRP, GS-X), ABCC2 (also known as MRP2, cMOAT, cMRP), ABCC3 (also known as MRP3, cMOAT2, EST 9 0 757, MLP 2, MO AT-D), ABCC 4 (also known as MRP 4, EST 17 0
- ABC C5 also known as MRP5
- SMRP SMRP
- EST 2771 45 MOAT-C
- ABCCC6 also known as MRP6, EST
- the human ABC protein belonging to the AB CF subfamily 1 (also known as GCN20 subfamily 1) such as 201 864 and the AB CG 1 (also known as WHITE, AB C 8) and AB CG 2 (also known as EST 1 5 7 4 8 1, MX R, BCRP, AB CP), A ⁇ CG 3 (alias A bcp 2, M xr 2), ABCG 4 (alias WH ITE 2), AB CG 5, AB CG 8, etc.
- Human ABC proteins belonging to the CG subfamily 1 (also known as WHITE subfamily 1) can be mentioned. Among them, P-glycoprotein (P-gp), MRP1, MRP2, CFTR, S UR l, ABC 1, TAP 1 and the like can be suitably exemplified.
- the membrane fraction expressing the ABC protein described above may be any fraction of a biological membrane in which the ABC protein gene is introduced and the ABC protein is expressed.
- a biological membrane include cell membranes, endoplasmic reticulum, and membranes of intracellular organelles such as mitochondria.
- the origin of these biological membranes is not particularly limited, but bacterial prokaryotic cells such as Escherichia coli, Streptomyces Bacillus subtilis, Streptococcus, S. phylococcus, eukaryotic cells such as yeast and Aspergillus, and Drosophila S.
- insect cells such as Spodoptera Sf9, L cells, CHO cells, C0S cells, HeLa cells, C127 cells, BALBZc3T3 cells, BHK21 cells, HEK293 cells, VERO cells, CV-1 cells, MDCK cells, Bowes melanoma cells, animal and plant cells such as oocyte cells such as African frogs, and the like. Insect cells such as Spodoptera Sf9 are preferred. ⁇
- the method for preparing the membrane fraction expressing the ABC protein includes preparing cells expressing the ABC protein and expressing the ABC protein.
- a method for preparing a membrane fraction from cells for example, a cDNA encoding the ABC protein is incorporated into an expression vector having a selection marker, and cultured for mammalian cells, insect cells, yeast, bacteria, and the like. Examples of the method include transfection of cells.
- an expression vector having a selection ability for example, a vector having a gene conferring resistance to a specific antibiotic such as neomycin, puromycin, hygromycin is used, and the transfected cells are subjected to antibiotics. By culturing in the presence of the substance, only cells having the ABC protein expression vector are selected.
- the ABC protein-expressing cells thus obtained are cultured in large quantities.
- a method for preparing a membrane fraction from cells expressing ABC protein for example, centrifugation of the above culture of ABC protein-expressing cells, collection of cells expressing ABC protein, , Crushing by osmotic pressure treatment, collecting the membrane fraction by centrifugation, suspending the collected membrane fraction in a buffer, and isolating and purifying the cell membrane fraction by sucrose gradient centrifugation.
- the cell membrane fraction be instantaneously frozen at a liquid nitrogen temperature and stored at 180 ° C.
- the label in the labeled nucleoside triphosphate or a derivative thereof is not particularly limited as long as it is detectable, but a radioactive label using a radioactive isotope such as 32 P, 33 P, 35 S, 14 C, 3 ⁇ , etc.
- fluorescent labels using fluorescein isothiocyanate, phycopyriprotein, rare earth metal chelates, dansyl chloride, tetramethylrhodamine isothiocyanate, and photoaffinity labeling using azide group, benzophenone, etc.
- radioactive labels can be particularly preferably exemplified.
- nucleoside triphosphate in the labeled nucleoside triphosphate or a derivative thereof examples include ATP, GTP, ITP, UTP, and CTP. Among them, ATP is particularly preferred. can do.
- Derivatives of nucleoside triphosphates, for example, ATP derivatives include [ 35 S] ATP r S, and i3-methylene ATP, 8-azido ATP.
- nucleoside diphosphate immobilizing substance in the present invention examples include forming a complex with nucleoside diphosphate by substituting the phosphate ion of nucleoside triphosphate or a derivative thereof to form a bond between nucleoside diphosphate and a membrane protein.
- the chemical substance to be maintained is not particularly limited, and examples thereof include vanadic acid and salts thereof.
- the filter used in the present invention is not particularly limited as long as it is a filter capable of filtering and separating unreacted labeled nucleoside triphosphate or a derivative thereof.
- ultrafiltration means are preferred in terms of filtration and separation efficiency.
- a plate having a built-in filter at the bottom and a suction filtration means below the filter are preferred.
- Microplate “unifilter” with a built-in filter at the bottom No. 770-330, Whatman
- Multiscreen Plate manufactured by MILLIPORE
- silent screen plate manufactured by Nalge Nunc
- a candidate substance of a drug such as an antitumor agent can be suitably exemplified.
- the transporter activity of the ABC protein of the present invention can be evaluated.
- the ABC protein substrate in the measurement method when the ABC protein is a P-glycoprotein, verapamil ( ⁇ sorane), quinidine, rhodamine 123, doxorubicin, digoxin, vincristine, vinblastine, daunorubicin, folate, cortisol, aldos Some steroids such as teron, etc. can be mentioned.
- the ABC protein is MRP 2,] 3-estradiol-17- ( ⁇ - ⁇ -Darc-mouth), sulfobromophthalein, etc. Can be mentioned.
- ABC protein is P-saccharide protein, and labeled nucleoside triphosphate is radioactive.
- labeled AT P 3 ⁇ 4 nucleoside diphosphate immobilizing substance is vanadic acid.
- the membrane fraction expressing P-glycoprotein, radiolabeled ATP, vanadic acid, and the test substance [substrate of P-glycoprotein] were combined with Tris-HC1, phosphate buffer, etc. React in reaction buffer.
- the pH of the reaction buffer is preferably 6 to 8, particularly preferably ⁇ 7 to 7.5.
- the reaction time is preferably 10 seconds to 3 hours, for example, about 1 to 30 minutes.
- the reaction is stopped, for example, by adding an excess amount of the buffer solution cooled to 0 (for example, 20 to 100 times the volume of the reaction solution) to the reaction solution and mixing.
- the reaction solution after the completion of the reaction is added, for example, to a 96-L L-Glass fill, and suction washing is performed.
- buffer solution was previously ice-cooled to 4.
- the substance is a substrate for P-glycoprotein.
- the transporter activity of the P-glycoprotein is low, it can be determined that the substance is a P-glycoprotein inhibitor.
- [ 3 H] ATP (NET-420, manufactured by PerkinElmer life science) was used as the radioisotope.
- S f 9 membrane a human P-glycoprotein (Pgpor MDR1) -expressing membrane (No. 4532228, manufactured by Daiichi Pure Chemicals) and an Sf9 control membrane (No. 4532) 00, manufactured by Daiichi Pure Chemicals Co., Ltd.).
- Pgpor MDR1 human P-glycoprotein
- Sf9 control membrane No. 4532 00, manufactured by Daiichi Pure Chemicals Co., Ltd.
- MicroScint registered trademark
- the amount of the reaction membrane per 1 ⁇ l can be freely set. Therefore, in order to find the optimal reaction membrane amount, the membrane amount per well was varied in three stages (5 zg, 2.5 g> 1 g), and the reaction was performed using verabamil as the compound. The final concentration of verapamil was 20 M. The result is shown in figure 2. From Fig. 2, it became clear that the detection range expanded as the amount of membrane used increased. Therefore, it was judged that the use amount of membrane of 5 ⁇ g was appropriate under these conditions, and the use amount of the membrane expressing P-saccharide protein used in the following experiments was set to 5 sig per 1 ⁇ l.
- verapamil was measured [3 H] AD P binding amount in the vanadate method in one three compounds.
- the reaction conditions were a reaction time of 5 minutes, a reaction temperature of 37 ° C., and a substrate addition concentration of 0.05 mM. Measurement results are subtracted from the control membrane background.
- Fig. 4 shows the results. From Figure 4, it can be seen that Verapamil, quinidine Quinidine, hinfurastin Vinbrastine, pink listin Vincristine, digoxin Digoxin, rhodamine 123, doxorubicin Doxorubicin, which are generally considered as substrates for P-glycoprotein.
- the blocking method using PVP polyvinylpyrrolidone
- the washing method using PBS which are generally considered to be effective, were examined.
- the final concentration of verapamil was 20M.
- the blocking method using PVP is specifically used for cleaning
- the cDNA encoding human MRP2 which has been cloned by a conventional method using the PCR method, is transcribed into a baculovirus vector pFASTBac 1 (BAC-T0-BAC R Bacu 1 ov irus Express ion Systems (Invit. rogen, 10359-016)) and transfected into Sf9 cells (Sf9 Frozen Cel Is B825-0 K Invitrogen) by the lipofection method.
- Baculovirus was recovered from the transfected cells, and cells expressing the MRP2 protein were obtained by further infecting Sf9 cells with the baculovirus ( and expression of MRP2 was analyzed by Western blotting).
- the MRP2-expressing S ⁇ 9 cells obtained by confirmation by the blot method were used at 27 ° C in serum-free insect medium (SF900II-SFM, manufactured by Invitrogen).
- MfP2 expressing Sf9 cells were collected by centrifugation (3 min at 300 rpm) and disrupted by sonication (10 min in a sonicator). Then, the membrane fraction of human MRP2-expressing Sf9 cells was collected by centrifugation (30 minutes at 100,000 rpm), and the separated membrane fraction was washed with PBS buffer (pH 7. 4) The cell membrane fraction was isolated and purified by sucrose gradient centrifugation. At body nitrogen temperature Instantly frozen and stored at 180 ° C.
- MRP2 is a type of ABCC transposon that is highly expressed in the bile duct side of the liver and excretes many drugs from the liver to the large intestine, which plays an important role in the liver detoxification mechanism. Therefore, we attempted to construct a method for measuring the amount of [ 3 H] ADP adsorbed on a human MRP2 expression membrane in one step using a 96-well type glass filter and aspiration and washing method. The measurement was performed in the same manner as in Example 1 except that the human MRP2-expressing Sf9 membrane prepared in Example 7 was used instead of the human P-glycoprotein expressing membrane.
- ⁇ -estradiol—17-(/ 3D-dalcuronide) a representative compound that is well known to be transported to MRP2 ⁇ -Estradiol-17-(/ 3-D-glucuronide)
- the amount of [ 3 H] ADP bound by the vanadate method was measured at the time of addition of sulfobromophthalein and sulfobromophthalein.
- the reaction conditions were a reaction time of 5 minutes, a reaction temperature of 37 ° C., and a substrate addition concentration of 0.1 mM.
- Fig. 6 shows the results.
- A represents 3-estradiol-17- ( ⁇ -D-dalcuronide)
- ⁇ represents sulfobromophthalein
- C no substrate added.
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EP04722949A EP1615033A4 (en) | 2003-03-25 | 2004-03-24 | METHOD OF SCREENING A SUBSTANCE INTERACTING WITH AN ABC PROTEIN |
US11/234,035 US20060141496A1 (en) | 2003-03-25 | 2005-09-23 | Method of screening substance interacting with ABC protein |
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JP2003083686A JP2005024245A (ja) | 2003-03-25 | 2003-03-25 | Abcタンパク質と相互作用する物質のスクリーニング方法 |
JP2003-083686 | 2003-03-25 |
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WO2006005975A3 (en) * | 2004-07-08 | 2006-06-01 | Solvo Biotechnology | Homo and heterodimer proteins of the abcg family, methods for detection and screening modulators thereof |
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EP2115139B8 (en) * | 2007-01-29 | 2015-03-18 | Teknologian tutkimuskeskus VTT Oy | Method for producing novel ige based reagents |
JP4929462B2 (ja) | 2007-01-29 | 2012-05-09 | 国立大学法人高知大学 | 細胞膜上分子と相互作用する化合物の検出方法 |
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Citations (4)
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JPS635265A (ja) * | 1986-06-25 | 1988-01-11 | Toshiba Corp | 免疫分析方法 |
JPS63238559A (ja) * | 1987-03-27 | 1988-10-04 | インストルメンテーション・ラボラトリー・ソチエタ・ペル・アチオーニ | 粒子上およびフイルタ−もしくは膜上の結合対員子を用いるアツセイ法 |
JPH09274039A (ja) * | 1996-04-03 | 1997-10-21 | Matsushita Electric Ind Co Ltd | 免疫学的手法を利用した診断装置 |
WO2002052262A1 (fr) * | 2000-12-25 | 2002-07-04 | The Circle For The Promotion Of Science And Engineering | Procédé et nécessaire de criblage de protéine de cassette abc |
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US5849733A (en) * | 1996-05-10 | 1998-12-15 | Bristol-Myers Squibb Co. | 2-thio or 2-oxo flavopiridol analogs |
-
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- 2003-03-25 JP JP2003083686A patent/JP2005024245A/ja active Pending
-
2004
- 2004-03-24 EP EP04722949A patent/EP1615033A4/en not_active Withdrawn
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS635265A (ja) * | 1986-06-25 | 1988-01-11 | Toshiba Corp | 免疫分析方法 |
JPS63238559A (ja) * | 1987-03-27 | 1988-10-04 | インストルメンテーション・ラボラトリー・ソチエタ・ペル・アチオーニ | 粒子上およびフイルタ−もしくは膜上の結合対員子を用いるアツセイ法 |
JPH09274039A (ja) * | 1996-04-03 | 1997-10-21 | Matsushita Electric Ind Co Ltd | 免疫学的手法を利用した診断装置 |
WO2002052262A1 (fr) * | 2000-12-25 | 2002-07-04 | The Circle For The Promotion Of Science And Engineering | Procédé et nécessaire de criblage de protéine de cassette abc |
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Cited By (1)
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WO2006005975A3 (en) * | 2004-07-08 | 2006-06-01 | Solvo Biotechnology | Homo and heterodimer proteins of the abcg family, methods for detection and screening modulators thereof |
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JP2005024245A (ja) | 2005-01-27 |
EP1615033A4 (en) | 2006-10-18 |
EP1615033A1 (en) | 2006-01-11 |
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