1. Membrane Transporter/Ion Channel
    Neuronal Signaling
  2. iGluR
  3. GYKI53655 hydrochloride

GYKI53655 hydrochloride 

Cat. No.: HY-103228 Purity: 99.01%
Handling Instructions

GYKI53655 hydrochloride is an α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) antagonist.

For research use only. We do not sell to patients.

GYKI53655 hydrochloride Chemical Structure

GYKI53655 hydrochloride Chemical Structure

CAS No. : 143692-48-2

Size Price Stock Quantity
Free Sample (0.5-1 mg)   Apply now  
10 mM * 1 mL in DMSO USD 158 In-stock
Estimated Time of Arrival: December 31
5 mg USD 144 In-stock
Estimated Time of Arrival: December 31
10 mg USD 204 In-stock
Estimated Time of Arrival: December 31
50 mg USD 828 In-stock
Estimated Time of Arrival: December 31
100 mg USD 1440 In-stock
Estimated Time of Arrival: December 31
200 mg   Get quote  
500 mg   Get quote  

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GYKI53655 hydrochloride is an α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) antagonist.

IC50 & Target


In Vitro

GYKI53655 hydrochloride (LY300168) inhibits α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) (10 μM)-induced responses with IC50 value of 5.9±0.1 μM. GYKI53655 hydrochloride inhibits AMPA (10 μM) responses in recombinant G1uR4 expressing HEK293 cells with IC50 value of 4.6±0.4 μM. Using 3 μM cyclothiazide the inhibition produced by GYKI53655 hydrochloride is 79±2% (n=4 cells). GYKI53655 hydrochloride produces only small inhibitions of kainate-induced currents at 30 μM and inhibits kainate-induced currents at a concentration of 100 μM by 12±2 (n=4) and 18±4 (n=4), respectively. GYKI53655 hydrochloride inhibits AMPA receptor-mediated responses in cerebella Purkinje neurons with an IC50 value of 1.5±0.1 μM[1].

In Vivo

GYKI53655 hydrochloride (4 mg/kg) is found to have a short-lasting depressant effect on neuronal responses to iontophoretic α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA), with a half-recovery time of approximately 7 min. GYKI53655 hydrochloride (4 and 8 mg/kg) substantially depresses or completely abolishes AMPA responses. Results demonstrate the dose-dependence of GYKI53655 hydrochloride (2 to 8 mg/kg) in depressing responses to AMPA. At the highest doses tested, GYKI53655 hydrochloride reduces AMPA responses to a comparable degree[2]. Tonic fit and death are completely prevented by GYKI53655 hydrochloride at dose over 5.0 mg/kg. The ED50 value of GYKI53655 hydrochloride is 2.2 mg/kg i.p. The maximal effects of GYKI53655 hydrochloride lasts 3 h then the exit inhibition effect of GYKI53655 hydrochloride falls to 20% 1 h later[3].

Powder -20°C 3 years
  4°C 2 years
In solvent -80°C 6 months
  -20°C 1 month
Solvent & Solubility
In Vitro: 

DMSO : ≥ 160 mg/mL (411.47 mM)

H2O : 8 mg/mL (20.57 mM; Need ultrasonic and warming)

*"≥" means soluble, but saturation unknown.

Stock Solutions
Concentration Solvent Mass 1 mg 5 mg 10 mg
1 mM 2.5717 mL 12.8584 mL 25.7169 mL
5 mM 0.5143 mL 2.5717 mL 5.1434 mL
10 mM 0.2572 mL 1.2858 mL 2.5717 mL
*Please refer to the solubility information to select the appropriate solvent.
Cell Assay

Whole-cell voltage clamp recordings are made from single cells with use of the tight seal whole cell configuration of the patch-clamp technique. Experiments are performed at room temperature (20 to 22°C) and recorded on an amplifier. GYKI53655 hydrochloride application is via a series of perfusion lines to a multi-barrelled applicator and exchange of solutions under the present recording conditions is approximately 100 msec. For the acutely isolated cerebella Purkinje neurons, GYKI53655 hydrochloride application is by bath perfusion and occurs within approximately 15 sec. Curve fitting to data points is based upon the equationy=100(Dn/(Dn+IC50n)), where the slope of the line n is fixed to a value of 1 and D is the antagonist concentration. Statistical significance is determined by one-way ANOVA followed by Student- Newman-Keulstest[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Animal Administration

Experiments are performed on 27 male Wistar rats (260 to 350 g). Briefly, rats are anaesthetized with halothane in O2 and tracheal, carotid and jugular cannulae are inserted. The lumbo-thoracic spinal cord is exposed and cut at T9-T11 and the animal is prepared for extracellular recordings of single dorsal horn neurone action potentials. Anaesthesia after surgery is maintained with α-chloralose. Jugular cannulae are inserted. GYKI53655 hydrochloride is administered intravenously. The effect of GYKI53655 hydrochloride is expressed quantitatively as percentages of control excitatory amino acids (EAA) responses, where control is taken as the mean of the last 3 pre-drug counts; mean values±s.e.mean are indicated. No corrections for spontaneous activity are made[2].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

Molecular Weight









Room temperature in continental US; may vary elsewhere

Purity: 99.01%

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Product Name:
GYKI53655 hydrochloride
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GYKI53655 hydrochloride

Cat. No.: HY-103228