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-resistant clones, which have sodium channels with an altered interaction with scorpion toxin; and parental-type clones, which have functional sodium channels similar to the ones from N18 cells but have other heritable alterations that confer toxin resistance. The frequency of conversion to all three variant phenotypes was enhanced by treatment with the missense mutagen N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), suggesting that all three variant phenotypes are the result of mutational events. Incorporation of [35S]methionine into the alpha-subunit of the sodium channel (Mr = 270,000; pI = 5.8 +/- 0.2) was studied in normal and variant clones by affinity chromatography on wheat germ agglutinin/Sepharose followed by analysis of labeled polypeptides by 1- and 2-dimensional gel electrophoresis. Sodium channel-deficient clones do not synthesize the alpha-subunit of the sodium channel, suggesting that mutations in these clones block expression of the gene for this protein subunit. The scorpion toxin-resistant clone LV10 synthesizes an alpha-subunit which has a molecular weight and pI similar to those of the parental clones within the resolution of the methods used.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Costa MR,Catterall WAsubject
Has Abstractpub_date
1982-07-01 00:00:00pages
196-203issue
1eissn
0026-895Xissn
1521-0111journal_volume
22pub_type
杂志文章abstract::Although G protein-coupled receptors are often categorized in terms of their primary coupling to a given type of Gα protein subunit, it is now well established that many show promiscuous coupling and activate multiple signaling pathways. Furthermore, some agonists selectively activate signaling pathways by promoting i...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.110.067454
更新日期:2011-02-01 00:00:00
abstract::In the present study, we have elucidated the functional characteristics and mechanism of action of methaqualone (2-methyl-3-o-tolyl-4(3H)-quinazolinone, Quaalude), an infamous sedative-hypnotic and recreational drug from the 1960s-1970s. Methaqualone was demonstrated to be a positive allosteric modulator at human α1,2...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.115.099291
更新日期:2015-08-01 00:00:00
abstract::Amitriptyline is a classic tricyclic antidepressant (TCA) and has been used to treat the depression and anxiety of patients with cancer, but its relevance to cancer cell apoptosis is not known. In the present study, we demonstrated that amitriptyline inhibited cyclin D2 transactivation and displayed potential antimyel...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.110.068122
更新日期:2011-04-01 00:00:00
abstract::Cannabinoids have been implicated in the reduction of glioma growth. The present study investigated a possible relationship between the recently shown induction of cyclooxygenase (COX)-2 expression by the endocannabinoid analog R(+)methanandamide [R(+)-MA] and its effect on the viability of H4 human neuroglioma cells....
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.002618
更新日期:2004-12-01 00:00:00
abstract::Previous studies revealed that phenylhistamines and histaprodifens possess higher potency and affinity at guinea pig histamine H(1)-receptor (gpH(1)R) than at human histamine H(1)-receptor (hH(1)R). However, we recently identified an imidazolylpropylguanidine [N(1)-(3-cyclohexylbutanoyl)-N(2)-[3-(1H-imidazol-4-yl)-pro...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.108.053009
更新日期:2009-03-01 00:00:00
abstract::Estrogenic and carcinogenic activity are shown to be separable properties. 2-Fluoroestradiol, a modified estrogen, did not induce renal clear-cell carcinoma in male Syrian hamsters despite its estrogenic potency, which is comparable to that of estradiol. 4-Fluoroestradiol, also a potent estrogen, did induce renal clea...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1983-03-01 00:00:00
abstract::4-Methyl-5-(2-pyrazinyl)-1,2-dithiole-3-thione (oltipraz), a prototype drug candidate containing a 1,2-dithiole-3-thione moiety, has been widely studied as a cancer chemopreventive agent. Oltipraz and other novel 1,2-dithiole-3-thione congeners have the capability to prevent insulin resistance via AMP-activated protei...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.108.051128
更新日期:2009-01-01 00:00:00
abstract::Although both second messenger response systems are fully functional in both cell lines, activation of muscarinic cholinergic receptors only results in inhibition of adenylate cyclase in NG108-15 neuroblastoma X glioma cells and stimulation of phosphoinositide hydrolysis in 1321N1 human astrocytoma cells. Muscarinic r...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1987-10-01 00:00:00
abstract::Identifying novel mechanisms to enhance glucagon-like peptide-1 (GLP-1) receptor signaling may enable nascent medicinal chemistry strategies with the aim of developing new orally available therapeutic agents for the treatment of type 2 diabetes mellitus. Therefore, we tested the hypothesis that selectively modulating ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.112.080432
更新日期:2012-12-01 00:00:00
abstract::The regulation of cellular responsiveness to dopamine via the D2 dopamine receptor was investigated in mouse fibroblast Ltk-cells stably expressing the rat D2-short receptor [Nature (Lond.) 336:783-787 (1988)]. Dopamine inhibited forskolin-stimulated cAMP levels in these cells (half-maximal inhibition at 3.9 +/- 1.1 n...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1991-01-01 00:00:00
abstract::We have previously reported that, depending on the dose, nitric oxide (NO)-generating agents exert a dual facilitatory and inhibitory action on glutamatergic transmission on the rostral ventrolateral medulla (RVLM) neurons. The molecular mechanisms underlying the NO-mediated synaptic inhibition have not yet been defin...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.000554
更新日期:2004-09-01 00:00:00
abstract::Increasing data indicate that brain endocannabinoid system plays a role in the effects of antidepressant medications. Here we examined the effect of in vivo exposure to the selective serotonin uptake inhibitor fluoxetine on cannabinoid type 1 (CB(1)) receptor density and functionality in the rat prefrontal cortex (PFC...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.109.060079
更新日期:2010-03-01 00:00:00
abstract::Hypertriglyceridemia is a frequent complication accompanying the treatment of patients with either retinoids or rexinoids, [retinoid X receptor (RXR)-selective retinoids]. To investigate the cellular and molecular basis for this observation, we have studied the effects of rexinoids on triglyceride metabolism in both n...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.59.2.170
更新日期:2001-02-01 00:00:00
abstract::A polyamine component of Agelenopsis aperta spider venom designated FTX is reported to be a selective antagonist of P-type calcium channels in the mammalian brain. Consequently, this component has frequently been used as a pharmacological tool to determine the presence, distribution, and function of P-type channels in...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-10-01 00:00:00
abstract::The epithelial sodium channel (ENaC) is believed to represent the rate-limiting step for sodium absorption in the renal collecting duct. Consequently, ENaC is a central effector affecting systemic blood volume and pressure. Sodium and water transport are dysregulated in diabetes mellitus. Peroxisome proliferator-activ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.109.056911
更新日期:2009-12-01 00:00:00
abstract::The present study investigates mRNA and protein levels of A3 adenosine receptors in resting (R) and activated (A) human lymphocytes. The receptors were evaluated by the antagonist radioligand [3H]5-N-(4-methoxyphenyl-carbamoyl)amino-8-propyl-2(2furyl)-pyrazolo-[4,3e]-1,2,4-triazolo-[1,5-c]-pyrimidine ([3H]MRE 3008F20)...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.65.3.711
更新日期:2004-03-01 00:00:00
abstract::In order to elucidate the key atoms and/or stereostructures necessary for the inhibitory emergence of aldose reductase, crystal structure determinations were carried out for 11 oxazolecarbamate analogues, which have similar chemical and physicochemical properties but different inhibitory activities. The molecular conf...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1988-09-01 00:00:00
abstract::Molecular cloning of membrane-spanning mammalian adenylyl cyclases (ACs) has led to the discovery of nine different isotypes, making ACs potentially useful therapeutic targets. This study investigated the mechanism by which fungicidal nitroimidazole compounds modulate AC activity. Current evidence indicates that biolo...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.63.3.624
更新日期:2003-03-01 00:00:00
abstract::Cytochrome P450 (P450) enzymes are responsible for metabolizing drugs. Expression of P450s can directly affect drug metabolism, resulting in various outcomes in therapeutic efficacy and adverse effects. Several nuclear receptors are transcription factors that can regulate expression of P450s at both basal and drug-ind...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.118.112235
更新日期:2018-07-01 00:00:00
abstract::A human recombinant L-type Ca2+ channel (alpha1C,77) was coexpressed with the rat angiotensin AT1A receptor in Xenopus laevis oocytes. In oocytes expressing only alpha1C,77 channels, application of human angiotensin II (1-10 microM) did not affect the amplitude or kinetics of Ba2+ currents (IBa). In sharp contrast, in...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.54.6.1106
更新日期:1998-12-01 00:00:00
abstract::Several reports have been published recently demonstrating a beneficial effect of epidermal growth factor receptor (EGFR) inhibitors in improving pathologic and behavioral conditions in neurodegenerative diseases (NDDs) such as Alzheimer's disease and Amyotrophic Lateral Sclerosis (ALS) as well as the brain and spinal...
journal_title:Molecular pharmacology
pub_type: 杂志文章,评审
doi:10.1124/mol.120.119909
更新日期:2020-07-01 00:00:00
abstract::A Walker 256 rat carcinoma cell line (WR) has been shown to be resistant to a broad spectrum of bifunctional nitrogen mustards (NM) in cell culture. The parent cell line (WS) from which the WR cells were selected retains marked sensitivity to this class of drugs. Karyotype analysis showed that the parent WS had a chro...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1982-05-01 00:00:00
abstract::Many Gi-coupled receptors are known to interact with the pertussis toxin (PTX)-insensitive Gz protein. Given that the alpha subunits of Gi and Gz share only 60% identity in their amino acid sequences, their receptor-interacting domains must be highly similar. By swapping the carboxyl termini of alpha i2 and alpha z wi...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.52.1.38
更新日期:1997-07-01 00:00:00
abstract::The effect of cyanomorpholinyldoxorubicin, morpholinyldoxorubicin, doxorubicin, and Actinomycin D were studied on purified mouse leukemia (L1210) DNA topoisomerases I and II. DNA unwinding and cross-linking were also studied. It was found that 1) morpholinyldoxorubicin, cyanomorpholinyldoxorubicin, and Actinomycin D (...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1990-07-01 00:00:00
abstract::The in vitro binding of [3H]LY354740, the first high affinity group II-selective metabotropic glutamate (mGlu) receptor radioligand, was characterized in rat cortical, hippocampal, and thalamic membranes as well as in rat brain sections. [3H]LY354740 binding was saturable in all regions investigated. Nonspecific bindi...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00
abstract::In an effort to combine the benefits of fibrinolytics, such as staphylokinase, with those of thrombin inhibitors for the prevention of vessel reocclusion after vascular injury, we have produced several chimeric proteins with plasminogen-activating and thrombin-inhibiting properties. Fusion proteins were constructed co...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.62.2.203
更新日期:2002-08-01 00:00:00
abstract::G protein-coupled receptor (GPCR) kinases (GRKs) play a key role in terminating signals initiated by agonist-bound GPCRs. However, chronic stimulation of GPCRs, such as that which occurs during heart failure, leads to the overexpression of GRKs and maladaptive downregulation of GPCRs on the cell surface. We previously...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.119.118661
更新日期:2020-06-01 00:00:00
abstract::Stimulation of N-methyl-D-aspartate (NMDA) receptors is believed to underlie long-term memory formation, and excessive NMDA receptor activation has been linked to several neuropathological conditions. Phosphorylation and activation of p42/44 mitogen-activated protein kinase (ERK) is believed to mediate many of these e...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.005447
更新日期:2005-04-01 00:00:00
abstract::Previous studies have shown that neural stimulation of brown adipose tissue (BAT) reorganizes the expression and activity of signaling proteins in the beta-adrenergic adenylyl cyclase pathway. Cold stress increases neural stimulation of BAT and increases alpha1-adrenergic receptor number; however, the alpha1 receptor ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.51.4.644
更新日期:1997-04-01 00:00:00
abstract::Large conductance, Ca(2+)-activated K+ channels are believed to underlie interburst intervals and, thus, contribute to the control of hormone release from neurohypophysial terminals. Because ethanol inhibits the release of vasopressin and oxytocin, we studied its effects on large conductance, Ca(2+)-activated K+ chann...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-01-01 00:00:00