LY503430, a novel alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor potentiator with functional, neuroprotective and neurotrophic effects in rodent models of Parkinson's disease.
Glutamate is the major excitatory transmitter in the brain. Recent developments in the molecular biology and pharmacology of the alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) subtype of glutamate receptors have led to the discovery of selective, potent, and systemically active AMPA receptor potentiators. These molecules enhance synaptic transmission and play important roles in plasticity and cognitive processes. In the present study, we first characterized a novel AMPA receptor potentiator, (R)-4'-[1-fluoro-1-methyl-2-(propane-2-sulfonylamino)-ethyl]-biphenyl-4-carboxylic acid methylamide (LY503430), on recombinant human GLUA1-4 and native preparations in vitro and then evaluated the potential neuroprotective effects of the molecule in rodent models of Parkinson's disease. Results indicated that submicromolar concentrations of LY503430 selectively enhanced glutamate-induced calcium influx into human embryonic kidney 293 cells transfected with human GLUA1, GLUA2, GLUA3, or GLUA4 AMPA receptors. The molecule also potentiated AMPA-mediated responses in native cortical, hippocampal, and substantia nigra neurons. We also report here that LY503430 provided dose-dependent functional and histological protection in animal models of Parkinson's disease. The neurotoxicity after unilateral infusion of 6-hydroxydopamine into either the substantia nigra or the striatum of rats and that after systemic 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine in mice were reduced. Interestingly, LY503430 also had neurotrophic actions on functional and histological outcomes when treatment was delayed until well after (6 or 14 days) the lesion was established. LY503430 also produced some increase in brain-derived neurotrophic factor in the substantia nigra and a dose-dependent increases in growth associated protein-43 (GAP-43) expression in the striatum. Therefore, we propose that AMPA receptor potentiators offer the potential of a new disease modifying therapy for Parkinson's disease.
Murray
Tracey K
TK
Eli Lilly & Co Ltd, Lilly Research Centre, Surrey, UK.
Whalley
Katherine
K
Robinson
Christine S
CS
Ward
Mark A
MA
Hicks
Caroline A
CA
Lodge
David
D
Vandergriff
Jim L
JL
Baumbarger
Polly
P
Siuda
Edward
E
Gates
Mary
M
Ogden
Ann M
AM
Skolnick
Phil
P
Zimmerman
Dennis M
DM
Nisenbaum
Eric S
ES
Bleakman
David
D
O'Neill
Michael J
MJ
D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine / Q000494:pharmacology; D000577:Amides / Q000494:pharmacology*; D000818:Animals; D001713:Biphenyl Compounds / Q000494:pharmacology*; D002478:Cells, Cultured; D003342:Corpus Striatum / Q000187:drug effects; D004149:Dioxoles / Q000494:pharmacology; D004195:Disease Models, Animal; D018690:Excitatory Amino Acid Agonists / Q000494:pharmacology; D019922:GAP-43 Protein / Q000494:pharmacology; D006624:Hippocampus / Q000166:cytology; D006801:Humans; D008297:Male; D009474:Neurons / Q000187:drug effects* / Q000378:metabolism; D018696:Neuroprotective Agents / Q000494:pharmacology*; D016627:Oxidopamine / Q000494:pharmacology; D010300:Parkinson Disease / Q000378:metabolism*; D010880:Piperidines / Q000494:pharmacology; D017397:Prefrontal Cortex / Q000166:cytology; D051381:Rats; D017207:Rats, Sprague-Dawley; D018091:Receptors, AMPA / Q000819:agonists*; D017470:Receptors, Glutamate / Q000378:metabolism; D013378:Substantia Nigra / Q000166:cytology*; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / Q000494:pharmacology
C476678:(R)-4'-(1-fluoro-1-methyl-2-(propane-2-sulfonylamino)-ethyl)-biphenyl-4-carboxylic acid methylamide; C097396:1-(quinoxalin-6-ylcarbonyl)piperidine; D000577:Amides; D001713:Biphenyl Compounds; D004149:Dioxoles; D018690:Excitatory Amino Acid Agonists; D019922:GAP-43 Protein; D018696:Neuroprotective Agents; D010880:Piperidines; D018091:Receptors, AMPA; D017470:Receptors, Glutamate; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; D016627:Oxidopamine; D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine