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G-protein inwardly rectifying potassium (GIRK) channels mediate the synaptic actions of numerous neurotransmitters in the mammalian brain and play an important role in the regulation of neuronal excitability in most brain regions through activation of various G-protein-coupled receptors such as the serotonin 5-HT(1A) receptor. In this report we describe the(More)
The present study describes a complete and detailed neuroanatomical distribution map of the phospholipase C beta1 (PLCβ1) isoform along the adult rat neuraxis, and defines the phenotype of cells expressing PLCβ1, along with its subcellular localization in cortical neurons as assessed by double-immunofluorescence staining and confocal laser scanning.(More)
5-HT(1A) receptors were studied via [(3)H]WAY-100635 and [(3)H]8-OH-DPAT binding to rat brain cortical membranes. We characterized the effect of zinc (Zn(2+)) on the binding properties of the 5-HT(1A) receptor. The allosteric ternary complex model was applied to determine the dissociation constant (K(A)) of Zn(2+) and their cooperativity factors (alpha)(More)
In this report, we describe the localization of diacylglycerol lipase-α (DAGLα) in nuclei from adult cortical neurons, as assessed by double-immunofluorescence staining of rat brain cortical sections and purified intact nuclei and by western blot analysis of subnuclear fractions. Double-labeling assays using the anti-DAGLα antibody and NeuN combined with(More)
To investigate changes in muscarinic receptor-stimulated phospholipase C-beta (PLC-beta) activity during brain development, we examined the functional coupling of each of the three major protein components of the phosphoinositide system (M1, M3, and M5 muscarinic receptor subtypes; Gq/11 proteins; PLC-beta1-4 isoforms) in membrane preparations from(More)
Stimulation of phospholipase Cbeta by receptor agonists and G proteins has been characterized in crude cerebral membrane preparations, but little is known about their presynaptic localizations and little information is currently available for human brain tissue. The characteristics of phosphoplipase C transmembrane signaling were studied in crude and(More)
Phosphoinositide (PtdIns) signaling involves the generation of lipid second messengers in response to stimuli in a receptor-mediated manner at the plasma membrane. In neuronal cells of adult brain, the standard model proposes that activation of metabotropic receptors coupled to Phospholipase C-β1 (PLC-β1) is linked to endocannabinoid signaling through the(More)
RATIONALE One of the major pathways for neurotransmitter signaling involves phosphoinositide-specific and G-protein-dependent phospholipase C-beta (PLC-beta), which stimulates the formation of inositol 1,4,5-trisphosphate and diacylglycerol. Serotonergic and muscarinic-cholinergic signals in the brain are largely mediated through the hydrolysis of(More)
In the present study, we report on the application of two specific polyclonal antibodies to different intracellular domains of the CB1 cannabinoid receptor to define the expression of the neural CB1 cannabinoid receptor at the histochemical level in frontal cortex and related limbic areas of the obese Zucker rats. Higher levels of CB1 receptor expression in(More)
Agonist- and guanine-nucleotide-stimulated phospholipase C-beta (PLC) activity was characterized in crude plasma membrane preparations from cerebral cortex, hippocampus and cerebellum of Ts65Dn mice, a model for Down syndrome, and their control littermates. The levels of expression of PLC-beta((1-4)) isoforms and G-protein alpha(q/11) subunits were also(More)