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WO1996038728A1 - Procede permettant de mesurer l'activite de liaison au recepteur a2a de composes d'utilite pharmacologique, a l'aide du ligand tritie (3h)-sch 58261 - Google Patents

Procede permettant de mesurer l'activite de liaison au recepteur a2a de composes d'utilite pharmacologique, a l'aide du ligand tritie (3h)-sch 58261 Download PDF

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Publication number
WO1996038728A1
WO1996038728A1 PCT/EP1996/002348 EP9602348W WO9638728A1 WO 1996038728 A1 WO1996038728 A1 WO 1996038728A1 EP 9602348 W EP9602348 W EP 9602348W WO 9638728 A1 WO9638728 A1 WO 9638728A1
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WIPO (PCT)
Prior art keywords
compound
receptors
brain tissue
receptor
mammalian brain
Prior art date
Application number
PCT/EP1996/002348
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English (en)
Inventor
Cristina Zocchi
Pier Giovanni Baraldi
Barbara Cacciari
Silvio Dionisotti
Ennio Ongini
Original Assignee
Schering-Plough S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schering-Plough S.P.A. filed Critical Schering-Plough S.P.A.
Priority to AU61238/96A priority Critical patent/AU6123896A/en
Publication of WO1996038728A1 publication Critical patent/WO1996038728A1/fr

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/94Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving narcotics or drugs or pharmaceuticals, neurotransmitters or associated receptors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/566Immunoassay; Biospecific binding assay; Materials therefor using specific carrier or receptor proteins as ligand binding reagents where possible specific carrier or receptor proteins are classified with their target compounds
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/573Immunoassay; Biospecific binding assay; Materials therefor for enzymes or isoenzymes
    • G01N33/5735Immunoassay; Biospecific binding assay; Materials therefor for enzymes or isoenzymes co-enzymes or co-factors, e.g. NAD, ATP
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2500/00Screening for compounds of potential therapeutic value

Definitions

  • Adenosine modulates a wide range of physiological functions by interaction with different receptor subtypes named Al, A2a, A2b and A3 [Pharmacol. Rev., 46, 143, (1994)]. While the availability of Al receptor ligands led to rapid progress in the characterization of this receptor subtype, the pharmacology of A2a adenosine receptors was hampered by the lack of selective ligands [Med. Res. Rev., 12, 423, (1992)]. In the past, using different strategies to block the interaction with Al receptors [Naunyn-Schmiedeberg's Arch. Pharmacol., 325, 218, (1984); Mol.
  • the A2a selective antagonist ( 3 H)-(E,18%-Z,82%)-8-(3,4-dimethoxystyryl)-l,3-dipro- pylxanthine [( 3 H)-KF 17837S] has been indicated to interact directly with the A2a adenosine receptor in rat striatal tissue, showing a specific binding of 60-70% [Mol. Pharmacol., 46, 817, (1995)].
  • One aspect of the present invention is the preparation of the labeled compound 5-amino-7-[2- (2 1 ,4' ,5' 3 H) ⁇ henetyl]-2-(2-furyl)-pyrazolo-[4,3-e]- -1,2,4-triazolo[l,5-c]pyrimidine (hereinafter referred to as ( 3 H)-Compound) .
  • the preferred label of the invention has the purpose of facilitating the measurement of the relative binding affinity values, preferably by introducing tritium ( H) atoms, and more preferably, located on the phenethyl group at the positions 2', 4' and 5'.
  • the second aspect of the invention is a method for determining the adenosine A2a receptor binding affinity of a test compound; said method consisting in:
  • test compound may be synthesized and/or purified from natural source such as animal or plant tissue.
  • kit for determining the A2a binding activity of a test compound comprising:
  • the tissue was homogenised in a Polytron PTA 10 Probe (setting 5, 20 sec) in 25 volumes (v/v) of 50 mM Tris-HCl buffer, pH 7,4, centrifuged at 48,000 x g for 10 min at 4°C and resuspended in Tris-HCl containing 2 units/ml of adenosine deaminase. After 30 min of incubation at 37°C, the membranes were centrifuged and pellet was stored at -70°C.
  • Binding Assay Saturation binding experiments were carried out in polypropylene test tubes containing an aliquot of striatal membranes (100 ug of protein /assay) in incubation buffer (50 mM Tris-HCl, pH 7.4) and 11 different concentrations of ( 3 H)-Compound (0.0625-64 nM) , in a final volume of 0.5 ml Non specific binding was defined in the presence of NECA 50 uM. All assays were performed at 25°C for 30 min, the separation of the free radioligand from the one bound to the receptor was carried out by fast filtration through Whatman GF/B filters using the Brandel cell harvester (Gaithersburg, MD, USA) .
  • Binding parameters were estimated by using the computerized program LIGAND [Anal. Biochem. , 107, 220, (1980)]. Results
  • ( 3 H)-Compound labeling directly the adenosine A2a striatal receptor, proves to be an excellent means for studying this adenosine A2a receptor subtype in mammalian brain.
  • Clear advantages over other A2a antagonist radioligand proposed for this purpose are the high receptor affinity and the low non specific binding.
  • a kit containing the necessary components to perform the assays as described above, as well as a method to utilize such kit, can be considered essential for evaluating the interaction of a test compound with A2a adenosine receptors in mammalian brain tissues.
  • the ( 3 H)-Compound has the characteristics to become a useful tool for the investigation of A2a receptors distributed in peripheral tissues, such as vascular preparations, platelets and neutrophils, in which their presence has been clearly demonstrated [TiPS, 14, 360, (1993)].

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Molecular Biology (AREA)
  • Urology & Nephrology (AREA)
  • Hematology (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Pathology (AREA)
  • Cell Biology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Biotechnology (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Saccharide Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Abstract

L'invention concerne un procédé permettant d'évaluer l'affinité de liaison du récepteur A2a d'adénosine de composés d'utilité pharmacologique. L'invention concerne en outre des réactifs et un kit particulièrement approprié aux mesures précitées.
PCT/EP1996/002348 1995-06-02 1996-06-01 Procede permettant de mesurer l'activite de liaison au recepteur a2a de composes d'utilite pharmacologique, a l'aide du ligand tritie (3h)-sch 58261 WO1996038728A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61238/96A AU6123896A (en) 1995-06-02 1996-06-01 A method for measuring the a2a receptor binding activity of compounds of pharmacological interest by the use of the trit iated ligand (3h)-sch 58261

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI95A001155 1995-06-02
ITMI951155A IT1275420B (it) 1995-06-02 1995-06-02 Metodo per misurare l'affinita' di legame al recettore a2a dell'adenosina di componenti di interesse farmacologico mediante l'uso del ligando triziato (3h)-sch 58261

Publications (1)

Publication Number Publication Date
WO1996038728A1 true WO1996038728A1 (fr) 1996-12-05

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Application Number Title Priority Date Filing Date
PCT/EP1996/002348 WO1996038728A1 (fr) 1995-06-02 1996-06-01 Procede permettant de mesurer l'activite de liaison au recepteur a2a de composes d'utilite pharmacologique, a l'aide du ligand tritie (3h)-sch 58261

Country Status (3)

Country Link
AU (1) AU6123896A (fr)
IT (1) IT1275420B (fr)
WO (1) WO1996038728A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6407236B1 (en) 1998-09-16 2002-06-18 Medco Research, Inc. Adenosine A3 receptor modulators
WO2004079329A3 (fr) * 2003-03-07 2004-12-09 Cambridge Biotechnology Ltd Identification de composes therapeutiques
US6921825B2 (en) 1998-09-16 2005-07-26 King Pharmaceuticuals Research & Development, Inc. Adenosine A3 receptor modulators
WO2007038284A1 (fr) 2005-09-23 2007-04-05 Schering Corporation 7-[2-[4-(6-FLUORO-3-MÉTHYL-1,2-BENZISOXAZOL-5-YL)-1-PIPÉRAZINYL]ÉTHYL]-2-(1-PROPYNYL)-7H-PYRAZOLO-[4,3-e]-[1,2,4]-TRIAZOLO-[1,5-c]-PYRIMIDIN-5 AMINE
US7759321B2 (en) 2003-03-07 2010-07-20 Cambridge Biotechnology Ltd Compounds for the treatment of pain
US7790698B2 (en) 2003-03-07 2010-09-07 Cambridge Biotechnology Ltd Use of adenosine receptor agonists in therapy
US8252766B2 (en) 2002-12-09 2012-08-28 Cbt Development Limited Use of spongosine for the treatment of pain
WO2018089901A3 (fr) * 2016-11-14 2019-06-06 Joslin Diabetes Center Système de livraison par des exosomes

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
A. NEGRETTI ET AL.: "In vitro pharmacological profile of the new non-xanthine A2a adenosine antagonist 8FB-PTP", RESEARCH COMMUNICATIONS IN MOLECULAR PATHOLOGY AND PHARMACOLOGY, vol. 87, no. 1, 1 January 1995 (1995-01-01), WSETBURY NY USA, pages 87 - 88, XP000603784 *
C. ZOCCHI ET AL.: "Binding of the radioligand (3H)-SCH 58261, a new non-xanthine A2a adenosine receptor antagonist, to rat striatal membranes", BRITISH JOURNAL OF PHARMACOLOGY, vol. 117, no. 7, 1 April 1996 (1996-04-01), LONDON UK, pages 1381 - 1386, XP000603818 *
P.G. BARALDI ET AL.: "Synthesis of new pyrazolo(4,3-e)1,2,4-triazolo(1,5-c) pyrimidine and 1,2,3-triazolo(4,5-c)pyrimidine displaying potent and selective activity as A2a adenosine receptor antagonists.", BIOORGANIC & MEDICINAL CHEMISTRY LETTERS, vol. 4, no. 21, 1 January 1994 (1994-01-01), LONDON UK, pages 2539 - 2544, XP000603773 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6407236B1 (en) 1998-09-16 2002-06-18 Medco Research, Inc. Adenosine A3 receptor modulators
US6448253B1 (en) 1998-09-16 2002-09-10 King Pharmaceuticals Research And Development, Inc. Adenosine A3 receptor modulators
US6921825B2 (en) 1998-09-16 2005-07-26 King Pharmaceuticuals Research & Development, Inc. Adenosine A3 receptor modulators
US8252766B2 (en) 2002-12-09 2012-08-28 Cbt Development Limited Use of spongosine for the treatment of pain
WO2004079329A3 (fr) * 2003-03-07 2004-12-09 Cambridge Biotechnology Ltd Identification de composes therapeutiques
JP2006519602A (ja) * 2003-03-07 2006-08-31 ケンブリッジ・バイオテクノロジー・リミテッド 治療用化合物の同定
US7759321B2 (en) 2003-03-07 2010-07-20 Cambridge Biotechnology Ltd Compounds for the treatment of pain
US7790698B2 (en) 2003-03-07 2010-09-07 Cambridge Biotechnology Ltd Use of adenosine receptor agonists in therapy
WO2007038284A1 (fr) 2005-09-23 2007-04-05 Schering Corporation 7-[2-[4-(6-FLUORO-3-MÉTHYL-1,2-BENZISOXAZOL-5-YL)-1-PIPÉRAZINYL]ÉTHYL]-2-(1-PROPYNYL)-7H-PYRAZOLO-[4,3-e]-[1,2,4]-TRIAZOLO-[1,5-c]-PYRIMIDIN-5 AMINE
WO2018089901A3 (fr) * 2016-11-14 2019-06-06 Joslin Diabetes Center Système de livraison par des exosomes
US11519008B2 (en) 2016-11-14 2022-12-06 Joslin Diabetes Center Exosome delivery system

Also Published As

Publication number Publication date
ITMI951155A1 (it) 1996-12-02
AU6123896A (en) 1996-12-18
IT1275420B (it) 1997-08-05
ITMI951155A0 (it) 1995-06-02

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