For research use only.

Catalog No.S2790 Synonyms: KW-6002

2 publications

Istradefylline Chemical Structure

CAS No. 155270-99-8

Istradefylline (KW-6002) is a selective adenosine A2A receptor (A2AR) antagonist with Ki of 2.2 nM. Phase 3.

Selleck's Istradefylline has been cited by 2 publications

1 Customer Review

  • The effect of caffeine (CAF) and adenosine A1 and A2A receptor antagonists, DPCPX and KW 6002 (KW) on DA release induced by MDMA in the mouse striatum.KW (1.25 and 2.5 mg/kg) were injected simultaneously with MDMA 20 or 40 mg/kg as indicated with an arrow. Values are the mean ± SEM (n = 6–8 animals). *P < 0.0001 represents a significant difference in comparison to control group; “a” P < 0.0002 represents a significant difference in comparison to MDMA group (repeated measures ANOVA and Tukey’s post-hoc test)

    Neurotox Res, 2015, 27(3):229-45.. Istradefylline purchased from Selleck.

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Biological Activity

Description Istradefylline (KW-6002) is a selective adenosine A2A receptor (A2AR) antagonist with Ki of 2.2 nM. Phase 3.
Adenosine A2A receptor [1]
2.2 nM(Ki)
In vitro

The affinity of Istradefylline for the A2AR is 70-fold greater than that for the A1 receptor with Ki of 2.2 nM versus 150 nM. [1] Exposure of primary rat striatal astrocytes to Istradefylline results in concentration-dependent abolition of bFGF induction of astrogliosis in vitro. [5] Binding affinities (Ki) of Istradefylline for A1 receptor, A2A receptor, and A3 receptor in human are >287 nM, 9.12 nM, and >681 nM, respectively, for A1 receptor and A2A receptor in rat 50.9 nM and 1.57 nM, respectively, and for A1 receptor and A2A receptor in mouse 105.02 nM and 1.87 nM, respectively. [6]

In vivo Istradefylline reverses CGS21680-induced and reserpine-induced catalepsy with ED50 of 0.05 mg/kg and 0.26 mg/kg, respectively. Istradefylline is over 10 times as potent in these models compared to other adenosine antagonists and dopamine agonist drugs. Administration of Istradefylline in combination with L-dopa (50 mg/kg) exerts prominent effects on haloperidol-induced and reserpine-induced catalepsy. [2] Oral administration of Istradefylline at 10 mg/kg to MPTP-treated common marmosets produces an increase in locomotor activity to approximately twice that of control and improves motor disability. Administration of Istradefylline (10 mg/kg, po, 90 minutes before SKF80723/quinpirole/L-DOPA) in combination with SKF80723 (1 mg/kg, ip), quinpirole (0.06 mg/kg ip), or L-DOPA (2.5 mg/kg po) produces a significant additive effect on locomotor activity and improvement of motor disability but not dyskinesia. [3] In the MPTP mice model, Istradefylline significantly attenuates striatal dopamine depletion under various conditions. Pretreatment with Istradefylline (3.3 mg/kg, i.p.) before a single dose of MPTP attenuates the partial dopamine and DOPAC depletions measured in striata 1 week later. [1] Oral administration of Istradefylline protects against the loss of nigral dopaminergic neuronal cells induced by 6-hydroxydopamine in rats, and prevents the functional loss of dopaminergic nerve terminals in the striatum and the ensuing gliosis caused by MPTP in mice. [4] Chronic Istradefylline treatment does not improve the reversal deficits in dopamine-depleted rats. [7] The tremulous jaw movements induced by pimozide are significantly reduced by co-administration of either Istradefylline or tropicamide. Pimozide-induced increases in ventrolateral striatal c-Fos expression are reduced by a behaviorally effective dose of Istradefylline, in contrast to tropicamide by which c-Fos expression in pimozide-treated rats is actually increased. [8]


Animal Research:[2]
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  • Animal Models: Common marmosets (Callithrix jacchus) with MPTP treatment
  • Dosages: 10 mg/kg
  • Administration: Oral gavage
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 6 mg/mL (15.6 mM)
Water Insoluble
Ethanol Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
30% propylene glycol, 5% Tween 80, 65% D5W
For best results, use promptly after mixing.
30 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 384.43


CAS No. 155270-99-8
Storage powder
in solvent
Synonyms KW-6002
Smiles CCN1C2=C(C(=O)N(C1=O)CC)N(C(=N2)C=CC3=CC(=C(C=C3)OC)OC)C

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT02610231 Completed Drug: Istradefylline 20 mg or 40 mg Idiopathic Parkinson''s Disease Kyowa Hakko Kirin Pharma Inc.|Kyowa Kirin Co. Ltd.|Kyowa Kirin Inc. December 2015 Phase 3
NCT02256033 Completed Drug: Istradefylline Hepatic Impairment Kyowa Hakko Kirin Pharma Inc.|Kyowa Kirin Inc. August 2014 Phase 1
NCT00455507 Completed Drug: Istradefylline|Drug: Placebo Parkinson''s Disease Kyowa Kirin Co. Ltd. March 2007 Phase 2
NCT00250393 Completed Drug: Istradefylline (KW-6002) Parkinson''s Disease Kyowa Kirin Co. Ltd. November 2005 Phase 2
NCT00199355 Completed Drug: Istradefylline (KW-6002) Parkinson''s Disease Kyowa Kirin Co. Ltd. April 2005 Phase 2

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID