Abstract:
:Effects of ethanol on the function of Ca(2+)-activated Cl- channels activated by G protein-coupled serotonin (5-hydroxytryptamine, (5-HT)1c) and muscarinic M1 cholinergic receptors were studied in Xenopus oocytes expressing mouse whole-brain mRNA. Ethanol (25-200 mM) inhibited currents evoked by both 5-HT and acetylcholine (ACh), in a concentration-dependent manner. The maximal effect was obtained with 150 mM ethanol, which produced 65 and 49% inhibition of 5-HT and ACh responses, respectively. In the presence of 100 mM ethanol, the EC50 values for both 5-HT and ACh were increased about 4-fold. In contrast, in oocytes expressing rat cerebellar mRNA, metabotropic glutamate receptor responses were much less sensitive to ethanol. To examine potential postreceptor sites for ethanol inhibition, guanosine-5'-O-(3-thio)triphosphate and myo-inositol-1,4,5-trisphosphate were injected intracellularly. Ethanol (100 mM) did not significantly inhibit the currents produced by either guanosine-5'-O-(3-thio)triphosphate or myo-inositol-1,4,5-trisphosphate. Activation of protein kinase C (PKC) by phorbol-12-myristate-13-acetate markedly inhibited 5-HT-induced responses. Both the PKC inhibitor peptide and staurosporine prevented ethanol inhibition of 5-HT-induced responses. Moreover, ethanol, similarly to phorbol-12-myristate-13-acetate and opposite to PKC inhibitors, enhanced the rate of Ca(2+)-activated Cl- current desensitization induced by repeated applications of 5-HT. These results indicate that certain types of receptor-G protein interactions are more susceptible than others to uncoupling by ethanol and that ethanol inhibition of 5-HT1c receptors requires PKC-mediated phosphorylation. We suggest that ethanol may activate PKC, which phosphorylates the receptors, resulting in inhibition of the responses.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Sanna E,Dildy-Mayfield JE,Harris RAsubject
Has Abstractpub_date
1994-05-01 00:00:00pages
1004-12issue
5eissn
0026-895Xissn
1521-0111journal_volume
45pub_type
杂志文章abstract::Metabotropic glutamate receptor 5 (mGlu5) is a target for the treatment of central nervous system (CNS) disorders, such as schizophrenia and Alzheimer's disease. Furthermore, mGlu5 has been shown to play an important role in hippocampal synaptic plasticity, specifically in long-term depression (LTD) and long-term pote...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.112.082891
更新日期:2013-04-01 00:00:00
abstract::The heart is richly endowed with K(ATP) channels, which function as biological sensors, regulating membrane potentials and electrical excitability in response to metabolic alterations. We recently reported that the cytochrome P450 metabolites of arachidonic acid, epoxyeicosatrienoic acids (EETs), potently activate car...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.62.5.1076
更新日期:2002-11-01 00:00:00
abstract::Lead (Pb(2+)) is a well-known inhibitor of voltage-dependent Ca(2+) channels in their native environments in several types of cells. However, its effects on discrete Ca(2+) channel phenotypes in isolation have not been well studied. We compared how specific subtypes of human neuronal high-voltage-activated Ca(2+) chan...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.62.6.1418
更新日期:2002-12-01 00:00:00
abstract::Regulator of G protein signaling (RGS) proteins accelerate the endogenous GTPase activity of Galpha(i/o) proteins to increase the rate of deactivation of active Galpha-GTP and Gbetagamma signaling molecules. Previous studies have suggested that RGS proteins are more effective on less efficiently coupled systems such a...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.043547
更新日期:2008-05-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.64.3.550
更新日期:2003-09-01 00:00:00
abstract::The effects of 5-hydroxytryptamine (5-HT)2A receptor activation on cAMP formation were studied in a cell line derived from embryonic rat cortex (A1A1). 5-HT (EC50 = 0.87 microM) amplified the amount of cAMP formed in response to 5'-N-ethylcarboxamidoadenosine (an adenosine A2 receptor agonist), cholera toxin, and fors...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1994-05-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.105.014191
更新日期:2005-11-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.036681
更新日期:2007-08-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-07-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-11-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-07-01 00:00:00
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journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:2000-11-01 00:00:00
abstract::The binding of agonists and antagonists to alpha 2-adrenergic receptors of human platelets was studied. The receptors showed homogeneous affinities for antagonists but two affinity states for the agonist (-)-epinephrine, which were modulated by guanine nucleotides. Van't Hoff plots of antagonist binding had a break po...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1986-03-01 00:00:00
abstract::Novel methods of detecting and quantitating cooperative interactions between an agent and both a tritiated (muscarinic) antagonist and the endogenous agonist (acetylcholine), acting at a common (muscarinic) receptor, have been devised. In a semiquantitative protocol, binding data are transformed into affinity ratios (...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1995-08-01 00:00:00
abstract::The clinical abuse of methamphetamine (METH) is a major concern because it can cause long-lasting neurodegenerative effects in humans. Current concepts of the molecular mechanisms underlying these complications have centered on the formation of reactive oxygen species. Herein, we provide cDNA microarray evidence that ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.61.5.1124
更新日期:2002-05-01 00:00:00
abstract::Capsaicin (vanilloid) sensitivity has long served as the functional signature of a subset of nociceptive sensory neurons. Mutagenesis studies have revealed seemingly distinct regions involved in mediating ligand binding and channel activation at the capsaicin binding site. Residue 547 (transmembrane region 4) mediates...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.106.023945
更新日期:2006-09-01 00:00:00
abstract::The initial event upon binding of insulin-like growth factor 1 to the insulin-like growth factor type-I receptor (IGF-1R) is auto-phosphorylation of tyrosine residues within the activation loop of the kinase domain followed by phosphorylation of other receptor tyrosine residues and the subsequent activation of the int...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.040014
更新日期:2008-03-01 00:00:00
abstract::The 5'-flanking region of the mouse mu opioid receptor (MOR) gene has two promoters, referred to as distal and proximal. MOR mRNA is predominantly initiated by the proximal promoter. Previously, several important cis-elements and trans-factors have been shown to play a functional role in the proximal promoter of the M...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.008284
更新日期:2005-05-01 00:00:00
abstract::The powerful analgesic effects of opioid drugs have captivated the interest of physicians and scientists for millennia, and the ability of opioid drugs to produce serious undesired effects has been recognized for a similar period of time (Kieffer and Evans, 2009). Many of these develop progressively with prolonged or ...
journal_title:Molecular pharmacology
pub_type: 杂志文章,评审
doi:10.1124/mol.119.119321
更新日期:2020-10-01 00:00:00
abstract::At sites of inflammation, endothelial cells play a major role in defining the types of leukocytes that are recruited to a specific area. This is accomplished, at least in part, through the cytokine induction of cell surface adhesion molecules, including vascular cell adhesion molecule 1 (VCAM-1). We investigated the r...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-06-01 00:00:00
abstract::Structural changes in the macromolecular targets of pharmacological agents can result in alterations in the efficacy of these agents. In previous studies, we identified a variant structural form of thymidylate synthase (TS) that is associated with relative resistance to 5-fluoro-2'-deoxyuridine, in a human colonic tum...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-08-01 00:00:00
abstract::The response of myeloid leukemia cells to treatment with 1-beta-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 ara-C is associated with transloc...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.61.6.1489
更新日期:2002-06-01 00:00:00
abstract::The aliphatic adenine analogues, D-eritadenine, L-eritadenine, L-threoeritadenine, and 9-(S)-(2,3-dihydroxypropyl)adenine [(S)DHPA] function as inhibitors/inactivators of purified S-adenosylhomocysteine (AdoHcy) hydrolase, but these compounds did not induce reduction of enzyme-bound NAD+. D-Eritadenine, L-eritadenine,...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-11-01 00:00:00
abstract::The organic anions picrate (2,4,6-trinitrophenol) and niflumate (2-[[3-(trifluoromethyl)phenyl]-amino]-3-pyridinecarboxylate) were examined for their effects on radioligand binding to the gamma-aminobutyric acid (GABA)/benzodiazepine receptor complex. Neither organic anion produced the enhancement of [35S] t-butylbicy...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1988-12-01 00:00:00
abstract::The interaction of [3H]acetylcholine ([3H]AcCh) with the muscarinic receptor was studied in seven distinct rat brain regions and in heart atrium by employing 10 microM atropine to define specific binding. The specific binding exhibited by the labeled neurotransmitter was found to be sensitive to muscarinic but not to ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1985-09-01 00:00:00
abstract::(6R)-5,6,7,8-Tetrahydrobiopterin (BH4), which is synthesized intracellularly from GTP, caused a concentration-dependent increase in rat pheochromocytoma (PC12) cell proliferation when added exogenously. Incubation with sepiapterin, which is converted enzymatically to BH4 within cells, also increased PC12 cell prolifer...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-01-01 00:00:00
abstract::The X-ray structure of the bacterial sodium channel NavAb provides a new template for the study of sodium and calcium channels. Unlike potassium channels, NavAb contains P2 helices in the outer-pore region. Because the sequence similarity between eukaryotic and prokaryotic sodium channels in this region is poor, the s...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.112.078212
更新日期:2012-07-01 00:00:00
abstract::2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) was found to activate protein kinases under cell- and nucleus-free conditions in isolated C57 mouse liver cytosol (100,000 x g supernatant). This action of TCDD was found to be aryl hydrocarbon receptor (AHR) dependent, concentration dependent, and inhibited by genistein, a t...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.52.4.667
更新日期:1997-10-01 00:00:00
abstract::Modulation of neuronal ion channels by the cloned rat brain CB1 cannabinoid receptor was investigated with the use of a heterologous neuronal expression system. Transient expression of the rat brain CB1 cannabinoid receptor was accomplished through microinjection of in vitro transcribed cRNA into the cytoplasm of enzy...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-04-01 00:00:00
abstract::The pharmacological preservation of bone in the ovariectomized rat by estrogen, selective estrogen receptor modulators (SERMs), and bisphosphonates has been well described. However, comprehensive molecular analysis of the effects of these pharmacologically diverse antiresorptive agents on gene expression in bone has n...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.105.011478
更新日期:2005-11-01 00:00:00