LY 404187

LY-404187 is a potent, selective and centrally active positive allosteric modulator of AMPA receptors, with the EC50s of 5.65, 0.15, 1.44, 1.66 and 0.21 µM for GluR1i, GluR2i, GluR2o, GluR3i and GluR4i, respectively. LY-404187 has therapeutic potential in a number of psychiatric disorders and neurodegenerative diseases[1][2].

Signaling Pathways >> Neuronal Signaling >> iGluR

Research Areas >> Neurological Disease

Signaling Pathways >> Membrane Transporter/Ion Channel >> iGluR

EC50: 5.65 µM (GluR1i), 0.15 µM (GluR2i), 1.44 µM (GluR2o), 1.66 µM (GluR3i), 0.21 µM (GluR4i)[2]

LY-404187 (3-10 nM) potentiates glutamate-evoked inward currents in human GluR4 transfected HEK293 cells[2]. LY-404187 (0.03-10 µM) selectively enhances glutamate-evoked currents through AMPA receptor/channels of acutely isolated pyramidal neurons with considerably greater potency (EC50=1.3±0.3 µM) and efficacy (Emax=45.3±8.0-fold increase) [3]. LY-404187 does not affect the magnitude or time course of wholecell K+ or Na+ currents in pre frontal cortex (PFC) pyramidal neurons at concentrations of 10 µM[3].

LY-404187 (0.5 mg/kg; s.c for 11 days) can prevents MPTP-induced neurotoxicity in mice[4]. LY-404187 (0.5 mg/kg; s.c. for 28 days) attenuates apomorphine-induced contraversive rotations and affords significant protection against the loss of tyrosine hydroxylase positive nigral cell bodies[4]. LY-404187 (0.1 or 0.5 mg/kg; s.c. for 14 days) affords functional, neurochemical and histological protection after infusion of 6-hydroxydopamine into the substantia nigra in rats[4]. LY-404187 (0.5 mg/kg; s.c. for 14 days) delayed treatment provides functional and histological improvement, suggesting a trophic action as administration is initiated after cell death[4]. LY-404187 (0.1 and 0.5 mg/kg; s.c. for 14 days) increases GAP-43 immunoreactivity in the striatum in a dose-dependent manner[4]. Animal Model: Male C57BL/6J mice (20-25 g) are challenged with MPTP on day 8[4] Dosage: 0.5 mg/kg Administration: S.c; twice daily on weekdays and once daily at weekends for 11 days Result: Attenuated the loss of tyrosine hydroxylase immunoreactivity in the substantia nigra. No significant change in tyrosine hydroxylase immunoreactivity in the dorsal and ventral striatum.

[1]. Quirk JC, et, al. LY404187: a novel positive allosteric modulator of AMPA receptors. CNS Drug Rev. Fall 2002; 8(3): 255-82.

[2]. Miu P, et, al. Novel AMPA receptor potentiators LY392098 and LY404187: effects on recombinant human AMPA receptors in vitro. Neuropharmacology. 2001 Jun; 40(8): 976-83.

[3]. Baumbarger PJ, et, al. Positive modulation of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors in prefrontal cortical pyramidal neurons by a novel allosteric potentiator. J Pharmacol Exp Ther. 2001 Jul; 298(1): 86-102.

[4]. O'Neill MJ, et, al. Neurotrophic actions of the novel AMPA receptor potentiator, LY404187, in rodent models of Parkinson's disease. Eur J Pharmacol. 2004 Feb 20; 486(2): 163-74.