as-605240 and 3-4-dihydroxyphenylglycol

Phosphatidylinositol 3-kinase (PI3K) has been implicated in synaptic plasticity and other neural functions in the brain. However, the role of individual PI3K isoforms in the brain is unclear. We investigated the role of PI3Kγ in hippocampal-dependent synaptic plasticity and cognitive functions. We found that PI3Kγ has a crucial and specific role in NMDA receptor (NMDAR)-mediated synaptic plasticity at mouse Schaffer collateral-commissural synapses. Both genetic deletion and pharmacological inhibition of PI3Kγ disrupted NMDAR long-term depression (LTD) while leaving other forms of synaptic plasticity intact. Accompanying this physiological deficit, the impairment of NMDAR LTD by PI3Kγ blockade was specifically correlated with deficits in behavioral flexibility. These findings suggest that a specific PI3K isoform, PI3Kγ, is critical for NMDAR LTD and some forms of cognitive function. Thus, individual isoforms of PI3Ks may have distinct roles in different types of synaptic plasticity and may therefore influence various kinds of behavior.

Topics: Analysis of Variance; Animals; Behavior, Animal; Biophysics; Chromones; Class Ib Phosphatidylinositol 3-Kinase; Conditioning, Classical; Electric Stimulation; Environment; Enzyme Inhibitors; Excitatory Amino Acid Agents; Excitatory Postsynaptic Potentials; Exploratory Behavior; Extinction, Psychological; Fear; Female; Gene Expression Regulation; Glycogen Synthase Kinase 3; Glycogen Synthase Kinase 3 beta; Hippocampus; In Vitro Techniques; Long-Term Synaptic Depression; Male; Maze Learning; Methoxyhydroxyphenylglycol; Mice; Mice, Inbred C57BL; Mice, Knockout; Morpholines; Neurons; Oncogene Protein v-akt; Phosphorylation; Quinoxalines; Receptors, N-Methyl-D-Aspartate; RNA, Messenger; Signal Transduction; Thiazolidinediones; Time Factors