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Abstract γ-Aminobutyric acid A (GABA A ) receptors (GABARs) are responsible for most fast inhibitory neurotransmission in the mammalian brain. The GABARs contain several allosteric modulatory sites, many of which are useful clinically. The activity of most of these modulators depends upon the...
Abstract To investigate the role of cAMP response element-binding protein (CREB) in the adaptive responses to psychotropic drugs, we have developed inducible, brain region-specific CREB transgenic mice using the tetracycline-regulated gene expression system. The tetracycline transactivator (tTA)...
Abstract The pS2 promoter is complex with binding sites for a number of protein factors that may participate in modulating its activity. The pS2 gene was transcriptionally activated by estrogens in HepG2 cells transformed (HepER3) to express the estrogen receptor α (ERα). The phorbol ester...
Abstract Activation of protein kinase C (PKC) stimulates nicotine-induced catecholamine secretion. PKC down-regulation by prolonged pretreatment with phorbol 12-myristate 13-acetate diminished nicotine-induced catecholamine secretion only slightly (∼16%), suggesting substantial PKC independence...
Abstract The response of myeloid leukemia cells to treatment with 1-β- d -arabinofuranosylcytosine (ara-C) includes activation of the c-Abl protein tyrosine kinase and the stress-activated protein kinase (SAPK). The present studies demonstrate that treatment of human U-937 leukemia cells with...
Abstract Presynaptic metabotropic glutamate receptors (mGluRs) often act as feedback inhibitors of synaptic transmission and serve important roles in defining the activity of glutamatergic synapses. Recent investigations have begun to identify novel interactions of presynaptic mGluRs, especially...
Abstract The first three transmembrane segments (M1–M3) of human nicotinic acetylcholine receptors (nAChRs) have been implicated in determining the efficacy of nicotine by studies of α3/α4 subunit chimeras ( Kuryatov et al., 2000a ). Nicotine has full efficacy on the α4β2 nAChR and partial...
Abstract The present study investigated the role of nitric oxide (NO)/cGMP signal transduction in the M 3 muscarinic acetylcholine receptor (mAChR)-stimulated increase in aquaporin-5 (AQP5) levels in the apical plasma membrane (APM) of rat parotid glands. Pretreatment of rat parotid tissue with...
Abstract Receptors have well-conserved regions that are recognized and activated by hormones and neurotransmitters. Most drugs bind to these sites and mimic or block the action of the native ligands. Using a high-throughput functional screen, we identified a potent and selective M 1 muscarinic...
Abstract Human P-glycoprotein (P-gp), an integral membrane transport protein, is responsible for the efflux of various drugs, including cytostatics from cancer cells leading to multidrug resistance. P-gp is composed of two homologous half domains, each carrying one nucleotide binding site. The...
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