Learn More
The mechanisms underlying seizure-induced changes in gene expression are unclear. Using a chromatin immunoprecipitation assay, we found that acetylation of histone H4 in rat hippocampal CA3 neurons was reduced at the glutamate receptor 2 (GluR2; GRIA2) glutamate receptor promoter but increased at brain-derived neurotrophic factor promoter P2 as soon as 3 hr(More)
Many genes whose expression is restricted to neurons in the brain contain a silencer element (RE1/NRSE) that limits transcription in nonneuronal cells by binding the transcription factor REST (also named NRSF or XBR). Although two independent domains of REST are known to confer repression, the mechanisms of transcriptional repression by REST remain obscure.(More)
Postsynaptic AMPA receptor (AMPAR) trafficking mediates some forms of synaptic plasticity that are modulated by NMDA receptor (NMDAR) activation and N-ethylmaleimide sensitive factor (NSF). We report that NSF is physiologically S-nitrosylated by endogenous, neuronally derived nitric oxide (NO). S-nitrosylation of NSF augments its binding to the AMPAR GluR2(More)
Prevailing views of neurotrophin action hold that the transcription factor CREB is constitutively bound to target genes with transcriptional activation occurring via CREB phosphorylation. However, we report that within several CRE-containing genes, CREB is not constitutively bound. Upon exposure of neurons to brain-derived neurotrophic factor (BDNF), CREB(More)
To understand how neurons control the expression of the AMPA receptor subunit GluR2, we cloned the 5' proximal region of the rat gene and investigated GluR2 promoter activity by transient transfection. RNase protection and primer extension of rat brain mRNA revealed multiple transcription initiation sites from -340 to -481 bases upstream of the GluR2 AUG(More)
Lipid rafts are special microdomains enriched in cholesterol, sphingolipids and certain proteins, and play important roles in a variety of cellular functions including signal transduction and protein trafficking. We report that in cultured cortical and hippocampal neurons the distribution of lipid rafts is development-dependent. Lipid rafts in mature(More)
Inositol phosphates are well-known signaling molecules, whereas the inositol pyrophosphates, such as diphosphoinositol pentakisphosphate (InsP7/IP7) and bis-diphosphoinositol tetrakisphosphate (InsP8/IP8), are less well characterized. We demonstrate physiologic regulation of Dictyostelium chemotaxis by InsP7 mediated by its competition with PtdIns(3,4,5)P3(More)
Neurons regulate the expression of genes essential to individual neuron function through elegant combinatorial interactions among a limited number of transcription factors. In addition, an economy of regulatory control is practiced within the nucleus that belies conceptual divisions of transcription factors into "repressors" and "activators." Studies of the(More)
Previous studies have identified multiple transcription initiation sites for the glutamate receptor 2 (GluR2) gene, resulting in a heterogeneous population of GluR2 transcripts in vivo that differ in the length of their 5'-untranslated leaders (5'-UTR). We designed a series of monocistronic and dicistronic GluR2 cDNA constructs that model the natural in(More)
Neuronal activity influences protein synthesis and neuronal growth. Availability of nutrients, especially leucine and arginine, regulates the mammalian target of rapamycin (mTOR) pathway that controls cell growth. We show that NMDA receptor activation markedly reduces arginine transport by decreasing surface expression of the cationic amino acid(More)