Abstract:
:Both human ether-à-go-go-related gene (hERG1) and the closely related human ether-à-go-go (hEAG1) channel are aberrantly expressed in a large proportion of human cancers. In the present study, we demonstrate that transfection of hERG1 into mouse fibroblasts is sufficient to induce many features characteristic of malignant transformation. An important finding of this work is that this transformation could be reversed by chronic incubation (for 2-3 weeks) with the hERG channel blocker dofetilide (100 nM), whereas more acute applications (for 1-2 days) were ineffective. The hERG1 expression resulted in a profound loss of cell contact inhibition, multiple layers of overgrowing cells, and high saturation densities. Cells also changed from fibroblast-like to a more spindle-shaped morphology, which was associated with a smaller cell size, a dramatic increase in cell polarization, a reduction in the number of actin stress fibers, and less punctate labeling of focal adhesions. Analysis of single-cell migration and scratch-wound closure clearly demonstrated that hERG1-expressing cells migrated more rapidly than vector-transfected control cells. In contrast to previous studies on hEAG1, there were no increases in rates of proliferation, or loss of growth factor dependency; however, hERG1-expressing cells were capable of substrate-independent growth. Allogeneic transplantation of hERG1-expressing cells into nude mice resulted in an increased incidence of tumors. In contrast to hEAG1, the mechanism of cellular transformation is dependent on ion conduction. Trafficking-deficient and conduction-deficient hERG1 mutants also prevented cellular transformation. These results provide evidence that hERG1 expression is sufficient to induce cellular transformation by a mechanism distinct from hEAG1. The most important conclusion of this study is that selective hERG1 channel blockers have therapeutic potential in the treatment of hERG1-expressing cancers.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Pier DM,Shehatou GS,Giblett S,Pullar CE,Trezise DJ,Pritchard CA,Challiss RA,Mitcheson JSdoi
10.1124/mol.113.091439subject
Has Abstractpub_date
2014-08-01 00:00:00pages
211-21issue
2eissn
0026-895Xissn
1521-0111pii
mol.113.091439journal_volume
86pub_type
杂志文章abstract::Analysis of the distribution of mRNA encoding the serotonin (5-hydroxytryptamine) 5-HT(2A) receptor and the mu opioid peptide receptor in rat brain demonstrated their coexpression in neurons in several distinct regions. These regions included the periaqueductal gray, an area that plays an important role in morphine-in...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.108.048272
更新日期:2008-11-01 00:00:00
abstract::Recently we demonstrated that the effects of beta 2-adrenoceptor (AR) stimulation to augment Ca2+ current (ICa), cytosolic Ca2+ (Cai) transients, and contractility in rat ventricular myocytes are largely dissociated from its effect to increase cellular cAMP levels. This result suggested that beta 2ARs might be coupled...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1995-02-01 00:00:00
abstract::Multidrug resistance protein (MRP) 4 transports a variety of endogenous and xenobiotic organic anions. MRP4 is widely expressed in the body and specifically localized to the renal apical proximal tubule cell membrane, where it mediates the excretion of these compounds into urine. To characterize the MRP4 substrate-bin...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.043661
更新日期:2008-10-01 00:00:00
abstract::Stimulatory effects of spermine at heteromeric N-methyl-D-aspartate (NMDA) receptors expressed from cloned subunits were studied by voltage-clamp recording in Xenopus oocytes. At NR1A/NR2B receptors, in the presence of a saturating concentration of glycine, the magnitude of spermine stimulation was dependent on the co...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1994-07-01 00:00:00
abstract::Mouse embryonic spinal cord neurons in culture exhibit spontaneous calcium oscillations from day in vitro (DIV) 6 through DIV 10. Such spontaneous activity in developing spinal cord contributes to maturation of synapses and development of pattern-generating circuits. Here we demonstrate that these calcium oscillations...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.111.071456
更新日期:2011-06-01 00:00:00
abstract::The endogenous bronchodilator, S-nitrosoglutathione (GSNO), increases expression, maturation, and function of both the wild-type and the DeltaF508 mutant of the cystic fibrosis transmembrane conductance regulatory protein (CFTR). Though transcriptional mechanisms of action have been identified, GSNO seems also to have...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.106.023242
更新日期:2006-10-01 00:00:00
abstract::The cardiac action potential is generated by a concerted action of different ion channels and transporters. Dysfunction of any of these membrane proteins can give rise to cardiac arrhythmias, which is particularly true for the repolarizing potassium channels. We suggest that an increased repolarization current could b...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.105.015859
更新日期:2006-01-01 00:00:00
abstract::Dilute formalin injected into the rat hindpaw as a nociceptive stimulus increases neurokinin-1 receptor (NK-1R) mRNA levels in the dorsal horn of the spinal cord. Increased NK-1R mRNA levels could result from increased mRNA stability or an increased rate of NK-1R mRNA transcription. In this study, RNA samples prepared...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1996-11-01 00:00:00
abstract::The ligand specificity of rat adenohypophyseal vasopressin receptors was directly compared to that of peripheral receptors of the V1 and V2 types. For this purpose a series of 15 recently designed vasopressin antagonists was used. The affinities of these antagonists for rat adenohypophyseal membranes were deduced from...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1986-08-01 00:00:00
abstract::Cell-penetrating peptides are amphipathic or cationic oligopeptides able to transport covalently attached cargoes across cell membranes. Peptide aptamers are polypeptide fragments of endogenous proteins that mimic and thus perturb interactions with other cellular proteins. Combining aptamer and CPP technology can gene...
journal_title:Molecular pharmacology
pub_type: 评论,杂志文章
doi:10.1124/mol.105.011429
更新日期:2005-04-01 00:00:00
abstract::We have synthesized and characterized a high-affinity alpha 1-adrenergic receptor probe, 4-amino-6,7-dimethoxy-2[4'- [5"(3"'-125I-iodo-4"'-aminophenyl)pentanoyl]-1'-piperazinyl] quinazoline (125I-A55453). This ligand binds reversibly to rat hepatic plasma membranes with high affinity (KD = 77 +/- 6 pM), and it labels ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-09-01 00:00:00
abstract::The exchange of tritium into water from saxitoxin molecules that were radiolabeled at the C-11 methylene position was measured at 37 degrees in solution and in suspensions of brain membranes. High concentrations of membrane receptors were used to assure that more than 80% of the total saxitoxin (STX) present was speci...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1982-03-01 00:00:00
abstract::The relationship between the phospholipase-stimulating and immunosuppressive properties of cyclosporin A (CsA) has been investigated in vitro. At concentrations of 0.025 microM and upwards, CsA caused dose-related inhibition of both mitogen- and alloantigen-stimulated uptake of tritiated thymidine by human mononuclear...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1993-09-01 00:00:00
abstract::To study the functional role of individual alpha1-adrenergic (AR) subtypes in blood pressure (BP) regulation, we used mice lacking the alpha1B-AR and/or alpha1D-AR with the same genetic background and further studied their hemodynamic and vasoconstrictive responses. Both the alpha1D-AR knockout and alpha1B-/alpha1D-AR...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.104.007500
更新日期:2005-03-01 00:00:00
abstract::We reported previously the formation of a glutathionyl conjugate of the active metabolite (AM) of clopidogrel and the covalent modification of a cysteinyl residue of human cytochrome P450 2B6 in a reconstituted system (Mol Pharmacol 80:839-847, 2011). In this work, we extended our studies of the metabolism of clopidog...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.112.079061
更新日期:2012-08-01 00:00:00
abstract::alpha 1-Adrenergic receptor (alpha 1-AR) agonists elevate the intracellular calcium concentration ([Ca2+]i) in 60-80% of astroglia in vitro. Likewise, 60-70% of astroglia exhibit specific binding sites for the alpha 1-AR-selective antagonist (+-)-125I-[beta-(4-hydroxyphenyl)-ethylaminomethyl]tetralone. The density of ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1993-08-01 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::Systematic series of monoamines, diamines, and triamines were used to define the structural requirements for interaction at the polyamine recognition site of the N-methyl-D-aspartate receptor complex. Effects of amines on binding of [3H]MK-801 to washed synaptic plasma membranes were measured in the presence of L-glut...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-04-01 00:00:00
abstract::Based on their relative affinities for cholecystokinin octapeptide (26-33) (CCK-8), cholecystokinin tetrapeptide (30-33) (CCK-4), desulfated CCK-8, and gastrin, cholecystokinin (CCK) receptors have been classified as CCK-A (alimentary) and CCK-B (brain). Selective nonpeptide antagonists of CCK-A and CCK-B receptors, a...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1991-03-01 00:00:00
abstract::Mammalian A2-adenosine receptor binding subunits (A2AR) can be visualized by covalent labeling with the photoaffinity crosslinking ligand 125I-2-[4-[2-[2-[(4-aminophenyl)methylcarbonylamino] ethylaminocarbonyl]ethyl]phenyl]ethylamino-5'-N-ethylcarboxamidoad enosine or directly with the azide derivative described in th...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1990-08-01 00:00:00
abstract::The cannabinoid analog abnormal cannabidiol [abn-cbd; (-)-4-(3-3,4-trans-p-menthadien-[1,8]-yl)-olivetol] does not bind to CB(1) or CB(2) receptors, yet it acts as a full agonist in relaxing rat isolated mesenteric artery segments. Vasorelaxation by abn-cbd is endothelium-dependent, pertussis toxin-sensitive, and is i...
journal_title:Molecular pharmacology
pub_type: 评论,杂志文章
doi:10.1124/mol.63.3.699
更新日期:2003-03-01 00:00:00
abstract::The gonadotropin-releasing hormone receptor (GnRH-R) of the African catfish couples to phospholipase C and belongs to the large family of G protein-coupled receptors. We recently demonstrated that removal of the carboxyl-terminal tail (S331-Q379) from the catfish GnRH-R results in a loss of agonist binding; the curren...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.56.6.1229
更新日期:1999-12-01 00:00:00
abstract::Previous studies have shown that at least two subtypes of somatostatin (SRIF) receptors (SRIF1 and SRIF2) are expressed in mammalian cells. SRIF1 receptors have high affinity for MK 678, whereas SRIF2 receptors have no affinity for MK 678 but selectively bind peptides with structures similar to that of CGP 23996. Rece...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1992-07-01 00:00:00
abstract::The aim of this study was to create and characterize constitutively active mutant (CAM) histamine H(1) receptors (H(1)R) using random mutagenesis methods to further investigate the activation process of the rhodopsin-like family of G protein-coupled receptors (GPCRs). This approach identified position 6.40 in TM 6 as ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.107.038547
更新日期:2008-01-01 00:00:00
abstract::Although nonsteroidal anti-inflammatory drugs (NSAIDs) are used as cancer chemopreventative agents, their mechanism is unclear because NSAIDs have cyclooxygenase-independent actions. We investigated an alternative target for NSAIDs, peroxisome proliferator-activated receptor-gamma (PPARgamma), activation of which decr...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.61.1.7
更新日期:2002-01-01 00:00:00
abstract::PC-12 cells, derived from a rat pheochromocytoma, were found to take up tritiated serotonin ([3H]5-HT) from the external medium by means of a saturable mechanism which follows Michaelis-Menten kinetics. The apparent Km of uptake was 0.39 microM and the Vmax was 0.40 pmole/min/10(6) cells. The uptake was temperature-de...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1982-03-01 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::In previous studies, it was shown that the overexpression of beta2-adrenoceptor (beta2AR) in the hearts of transgenic mice (Tg) leads to agonist-independent activation of adenylate cyclase and enhanced myocardial function. Here, we measured the physical coupling of beta2AR and Gs by evaluating the coimmunoprecipitatio...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.52.2.187
更新日期:1997-08-01 00:00:00
abstract::Previous studies have demonstrated that the quinone group may play an important role in modulating the alkylating activity of quinone alkylating agents. Introduction of a quinone moiety markedly increased the alkylating activity and cytotoxic activity of the model quinone alkylating agents benzoquinone mustard and ben...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:
更新日期:1991-09-01 00:00:00
abstract::The highly conserved aspartate residue in the second transmembrane domain of G protein-coupled receptors is present in position 113 in the type 1 neurotensin receptor (NTR1) but is replaced by an Ala residue in position 79 in the type 2 neurotensin receptor (NTR2). NTR1 couples to Galphaq to stimulate phospholipase C ...
journal_title:Molecular pharmacology
pub_type: 杂志文章
doi:10.1124/mol.55.2.210
更新日期:1999-02-01 00:00:00