Abstract:
:Quinones undergo redox cycling and/or arylation reactions with key biomolecules involved with cellular Ca2+ regulation. The present study utilizes nanomolar quantities of the fluorogenic maleimide 7-diethylamino-3-(4'-maleimidylphenyl)-4-methylcoumarin (CPM) to measure the reactivity of hyperreactive sulfhydryl moieties on sarcoplasmic reticulum (SR) membranes in the presence and absence of quinones by analyzing the kinetics of forming CPM-thioether adducts and localization of fluorescence by SDS-polyacrylamide gel electrophoresis. Doxorubicin, 1,4-naphthoquinone (NQ), and 1, 4-benzoquinone (BQ) are found to selectively and dose-dependently interact with a class of hyperreactive sulfhydryl groups localized on ryanodine-sensitive Ca2+ channels [ryanodine receptor (RyR)], and its associated protein, triadin, of skeletal type channels. NQ and BQ are the most potent compounds tested for reducing the rate of CPM labeling of hyperreactive SR thiols (IC50 = 0.3 and 1.8 microM, respectively) localized on RyR and associated protein. The reduced forms of quinone, tert-butylhydroquinone, and 5-imino-daunorubicin do not alter significantly the pattern or kinetics of CPM labeling up to 100 microM, demonstrating that the quinone group is essential for modulating the state of hyperreactive SR thiols. Nanomolar NQ is shown to enhance the association of [3H]ryanodine for its high-affinity binding site and directly enhance channel-open probability in bilayer lipid membrane in a reversible manner. By contrast, micromolar NQ produces a time-dependent biphasic action on channel function, leading to irreversible channel inactivation. These results provide evidence that nanomolar quinone selectively and reversibly alters the redox state of hyperreactive sulfhydryls localized in the RyR/Ca2+ channel complex, resulting in enhanced channel activation. The Ca2+-dependent cytotoxicities observed with reactive quinones formed at the microsomal surface by oxidative metabolism may be related to their ability to selectively modify hyperreactive thiols regulating normal functioning of microsomal Ca2+ release channels.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Feng W,Liu G,Xia R,Abramson JJ,Pessah INkeywords:
subject
Has Abstractpub_date
1999-05-01 00:00:00pages
821-31issue
5eissn
0026-895Xissn
1521-0111journal_volume
55pub_type
杂志文章abstract::The possibility that vasoactive intestinal polypeptide (VIP) may facilitate the nicotine-mediated induction of adrenal medullary tyrosine hydroxylase (TH) was investigated with primary cultures (5-7 days in vitro) of bovine adrenal chromaffin (BAC) cells. Exposure of BAC cells to 100 microM nicotine led to only a marg...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-03-01 00:00:00
abstract::Pharmacological studies suggest a role for CB1 cannabinoid receptors (CB1R) in regulating neurogenesis in the adult brain. To investigate this possibility, we measured neurogenesis by intraperitoneal injection of bromodeoxyuridine (BrdU), which labels newborn neurons, in wild-type and CB1R-knockout (CB1R-KO) mice. CB1...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.66.2.204
更新日期:2004-08-01 00:00:00
abstract::The diphosphoinositol polyphosphates ("inositol pyrophosphates") are a specialized subgroup of the inositol phosphate signaling family. This review proposes that many of the current data concerning the metabolic turnover and biological effects of the diphosphoinositol polyphosphates are linked by a common theme: these...
journal_title:Molecular pharmacology
pub_type: 杂志文章,评审
doi:10.1124/mol.109.055897
更新日期:2009-08-01 00:00:00
abstract::Activation of alpha 1-adrenergic receptors (alpha 1-AR) increases Na+/H+ exchange (NHE) in proximal tubule. NHE mediates the majority of active Na+ absorption in the proximal tubule. Three alpha 1-AR subtypes have been detected in kidney by molecular and binding techniques. We detected message for all three alpha 1-AR...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.52.6.1010
更新日期:1997-12-01 00:00:00
abstract::Variant neuroblastoma cell clones were selected for resistance to the cytotoxic effects of neurotoxins that cause persistent activation of sodium channels. Three classes of variant clones were obtained: sodium channel-deficient clones, which have markedly reduced numbers of functional sodium channels; scorpion toxin-r...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1982-07-01 00:00:00
abstract::Neuronal cell lines provide a source of pure populations of neurons and allow the properties of many neurotransmitter receptors to be studied. However, none of these cells have been reported to express functional gamma-aminobutyric acid (GABA)A receptors. Indeed, there have been no reports of cell lines expressing fun...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-08-01 00:00:00
abstract::The dissociation constants (Kd values) of substance P (SP), physalaemin, kassinin, and SP analogues acting on SP receptors in guinea pig ileal longitudinal muscle strips were determined by the pharmacological procedures of Furchgott [Adv. Drug Res. 3:21-55 (1966)]. This method involves analysis of the concentration-re...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1983-05-01 00:00:00
abstract::Cyclic nucleotide analogs were used to study relaxation of pig coronary arteries and guinea pig tracheal smooth muscle in an attempt to determine the roles of cAMP- and cGMP-dependent protein kinases (cA-K and cG-K). In pig coronary artery strips, cGMP analogs were generally more effective than cAMP analogs in promoti...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1988-10-01 00:00:00
abstract::The precise mechanism by which the cellular uptake of the endocannabinoid anandamide (AEA) occurs has been the source of much debate. In the current study, we show that neuronal differentiated CAD (dCAD) cells accumulate anandamide by a process that is inhibited in a dose-dependent manner by N-(4-hydroxyphenyl)arachid...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.108.044834
更新日期:2008-07-01 00:00:00
abstract::We studied the ability of norepinephrine to stimulate [3H]inositol trisphosphate production and calcium mobilization in rat-1 fibroblasts stably expressing the cloned alpha 1-adrenergic subtypes and their sensitivity to phorbol-12-myristate-13-acetate (PMA). It was observed that the three subtypes were able to activat...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-07-01 00:00:00
abstract::Large-conductance Ca(2+)-activated K(+) (BK(Ca)) channels encoded by the Slo1 gene are ubiquitously expressed, and they play a role in regulation of many cell types. In excitable cells, BK(Ca) channels and voltage-activated Ca(2+) channels often form functional complexes that allow the cytoplasmic domains of BK(Ca) ch...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.040733
更新日期:2008-02-01 00:00:00
abstract::The peroxisome proliferator-activated receptors (PPARs) represent pharmacological target molecules to improve insulin resistance in type 2 diabetes mellitus. Here we assessed a functional connection between pharmacological activation of PPAR and vascular endothelial growth factor (VEGF) expression in keratinocytes and...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.108.049395
更新日期:2008-10-01 00:00:00
abstract::The dopamine (DA) transporter (DAT) mediates the removal of released DA. DAT is the major molecular target responsible for the rewarding properties and abuse potential of the psychostimulant amphetamine (AMPH). AMPH has been shown to reduce the number of DATs at the cell surface, and this AMPH-induced cell surface DAT...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.106.023952
更新日期:2006-08-01 00:00:00
abstract::Cultured murine hepatoma 1c1c7 cells were treated with either the actin filament-disrupting drug cytochalasin D or the microtubule inhibitors colchicine and nocadazole (NOC) to assess the role of the cytoskeleton in the process of cytochrome P450 Cyp1a-1 induction. Indirect fluorescence analyses demonstrated that micr...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1994-05-01 00:00:00
abstract::We show here that arsenite (As(3+)) elicits multiple effects on gene control, such as the interruption of cell cycle control by initiating G(2)/M arrest as well as inhibiting the aryl hydrocarbon (Ah) receptor-mediated 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-inducible expression of CYP1A1. This raises the question ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.006130
更新日期:2005-04-01 00:00:00
abstract::Voltage-gated potassium (Kv) channels regulate many physiological functions and represent important therapeutic targets in the treatment of several clinical disorders. Although some of these channels have been well-characterized, the study of others, such as Kv3 channels, has been hindered because of limited pharmacol...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.105.011064
更新日期:2005-05-01 00:00:00
abstract::The human caudate and putamen contain two high affinity binding sites for [3H]spiroperidol. Both of these affinity states exhibit dopaminergic selectivity. Ascorbic acid, at 0.1 mM, induces a slow loss of the low affinity component of [3H]spiroperidol binding in these tissues. The addition of guanyl nucleotides to the...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1988-02-01 00:00:00
abstract::Regulator of G protein signaling (RGS) proteins are a family of approximately 20 proteins that negatively regulate signaling through heterotrimeric G protein-coupled receptors. The RGS proteins act as GTPase-activating proteins (GAPs) for certain Galpha subunits and as effector antagonists for Gqalpha. Mouse RGS14 enc...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.58.3.569
更新日期:2000-09-01 00:00:00
abstract::Smad4, a key transcription factor in the transforming growth factor-β signaling pathway, is involved in a variety of cell physiologic and pathologic processes. Here, we characterized megakaryocyte/platelet-specific Smad4 deficiency in mice to elucidate its effect on platelet function. We found that megakaryocyte/plate...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.116.107417
更新日期:2017-09-01 00:00:00
abstract::Cocaine use poses a major health problem not only because of the dependence it causes but also because of the generation of life-threatening cardiac arrhythmias following overdose. Elucidating the molecular mechanisms of action of cocaine, therefore, remains a critical step in developing treatment for cocaine addictio...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.56.6.1138
更新日期:1999-12-01 00:00:00
abstract::UDP-glucuronosyltransferase (UGT) 1A1 (UGT1A1) catalyzes the glucuronidation of bilirubin in liver. Among all UGT isoforms identified to date, it is the only relevant bilirubin-glucuronidating enzyme in human. Because glucuronoconjugation is the major route of bilirubin elimination, any genetic alteration that affects...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.56.3.526
更新日期:1999-09-01 00:00:00
abstract::The highly conserved Arg in the so-called DRY motif (Asp-Arg-Tyr) at the intracellular end of transmembrane helix 3 is in general considered as an essential residue for G protein coupling in rhodopsin-like seven transmembrane (7TM) receptors. In the open reading frame 74 (ORF74) receptor encoded by equine herpesvirus ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.105.011239
更新日期:2005-07-01 00:00:00
abstract::In saturation studies with [3H]dihydromorphine, unlabeled D-Ala2-D-Leu5-enkephalin (1 nM) inhibited the high-affinity binding component far more potently than the lower-affinity one. Similarly, morphine (1 nM) inhibited the higher-affinity binding of 3H-D-Ala2-D-Leu5-enkephalin to a greater extent than its lower-affin...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
abstract::The human dopamine and norepinephrine transporters (hDAT and hNET, respectively) control neurotransmitter levels within the synaptic cleft and are the site of action for amphetamine (AMPH) and cocaine. We investigated the role of a threonine residue within the highly conserved and putative phosphorylation sequence RET...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.110.069039
更新日期:2011-03-01 00:00:00
abstract::2-Hydroxy-4(-2,2,3,3,3-pentafluoropropoxy)-benzoic acid (UR-1505), a new molecule chemically related to salicylic acid, has immunomodulator properties and is currently under clinical development for treatment of atopic dermatitis. The present work describes the immunomodulatory profile of UR-1505. UR-1505 targets T ce...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.035212
更新日期:2007-08-01 00:00:00
abstract::The effect of relatively nontoxic levels of HgCl2 on semiconservative DNA synthesis and on DNA repair induced following treatment of intact cells with X-ray or ultraviolet (UV) light has been studied in cultured Chinese hamster ovary cells. In the presence of 1 microM HgCl2 the repair of DNA strand breaks induced by 4...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1986-02-01 00:00:00
abstract::Matrix metalloproteinases (MMPs) are synthesized in response to diverse stimuli, including cytokines, growth factors, hormones, and oxidative stress. Here we show that the nitric oxide (NO) donor 2-(N,N-diethylamino)-diazenolate-2-oxide (DEA-NO) and NO from murine macrophages transcriptionally regulate MMP-13 expressi...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.62.4.927
更新日期:2002-10-01 00:00:00
abstract::Most anticancer drugs have their origin in traditional medicinal plants. We describe here a flavone, 5,3'-dihydroxy-3,6,7,8,4'-pentamethoxyflavone (PMF), from the leaves of the Thai plant Gardenia obtusifolia, that has anti-inflammatory and anticancer potential. Because the nuclear factor-κB (NF-κB) pathway is linked ...
journal_title:Molecular pharmacology
pub_type: 杂志文章,收录出版
doi:10.1124/mol.110.067512
更新日期:2011-02-01 00:00:00
abstract::We cloned and expressed a human metabotropic glutamate receptor 1 alpha (HmGluR1 alpha) in a novel cell line. The human mGluR1 alpha cDNA was found to be 86% identical to rat mGluR1 alpha, and the predicted protein sequence was found to be 93% identical to rat mGluR1 alpha. We expressed HmGluR1 alpha in AV12-664, an a...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1995-10-01 00:00:00
abstract::Phosphorylation of tau protein promotes stability of the axonal cytoskeleton; aberrant tau phosphorylation is implicated in the biogenesis of paired helical filaments (PHF) seen in Alzheimer's disease. Protein kinases and phosphatases that modulate tau phosphorylation have been identified using in vitro techniques; ho...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1999-04-01 00:00:00