Chronic treatment with a MEK inhibitor reverses enhanced excitatory field potentials in Syngap1+/- mice

Pharmacological Reports : PR
Maksym V KopanitsaNoboru H Komiyama

Abstract

Synaptic Ras-GTPase-activating protein 1 (SYNGAP1) is an abundant brain-specific protein localized at the postsynaptic density of mammalian excitatory synapses. SYNGAP1 functions as a crucial regulator of downstream intracellular signaling triggered by N-methyl-d-aspartate receptor activation. One of the most important signaling pathways regulated by SYNGAP1 is the Ras-Raf-MEK-ERK pathway. SYNGAP1 deficiency is associated with hyperphosphorylation of MEK and ERK kinases and with altered synaptic function in Syngap1+/- mice. Loss-of-function mutations in the SYNGAP1 gene have been documented in many human cognitive and neurological disorders. However, there are currently no approaches that reverse the phenotypes of SYNGAP1 deficiency. Using electrophysiological recordings of field responses in hippocampal slices, we examined if disturbances of synaptic physiology in the hippocampus of 7-8-month old Syngap1+/- mice were sensitive to the effect of the MEK inhibitor PD-0325901 given orally for 6days. We found that in hippocampal slices from vehicle-treated Syngap1+/- mice, basal synaptic responses were higher and their long-term potentiation (LTP) was lower than in slices from wild-type littermates. Chronic administration of PD-032...Continue Reading

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Related Concepts

PD 0325901
Biochemical Pathway
SYNGAP1
Neurologic Manifestations
Hyperphosphorylation
Protoplasm
Resting Potentials
Action Potentials
Synaptic Transmission
Molecular_function

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