Abstract:
:Active oxygen species are generated in cells during pathophysiologic conditions such as inflammation and postischemic reperfusion. If oxygen radical scavengers are added before reperfusion, then the magnitude of injury is reduced. We investigated whether free radicals generated following exposure to hypoxia and reoxygenation activate voltage-dependent K+ ion channels in tumor cells in vitro. Using the technique of whole cell voltage clamping, we recorded currents from two families of potassium (K+) channels that were activated following reoxygenation. One of these groups possessed the electrophysical characteristics of a tetraethylammonium (TEA)-sensitive delayed rectifier channel and the other possessed characteristics of a Tea-insensitive slow inactivating channel. We present evidence which suggests that K+ channels are activated following reoxygenation but not during the hypoxia phase. The K+ currents decayed with time following reoxygenation. The decay characteristics of the K+ currents depended on the duration and level of hypoxia to which the cells were exposed. To determine whether activation of K+ channels by reoxygenation was initiated by free radicals, we pretreated cells with N-Acetyl L-Cysteine (NAC), a free radical scavenger, and found that this pretreatment abolished the currents induced by reoxygenation. We also present evidence that free radicals do not directly act on the channel itself, but activate a protein kinase which, in turn, activates the K+ channels. Taken together, these results indicate that one of the early responses to oxidative stress is the activation of K+ currents.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Koong AC,Giaccia AJ,Hahn GM,Saad AHdoi
10.1002/jcp.1041560217subject
Has Abstractpub_date
1993-08-01 00:00:00pages
341-7issue
2eissn
0021-9541issn
1097-4652journal_volume
156pub_type
杂志文章abstract::Colon cancer remains one of the lethal malignancies in the world. Aberrant activation of canonical Wnt/β-catenin signaling pathway has been observed in colon cancer. In contrast, the non-canonical Wnt signaling functions remain obscure. Wnt5a is a representative non-canonical Wnt ligand which has gained extensive atte...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.24566
更新日期:2014-12-01 00:00:00
abstract::The biosynthesis and assembly of the peripheral sector (V1) of the vacuolar proton-translocating adenosine triphosphatase (V-ATPase) was studied in a bovine kidney epithelial cell line. Monolayer cultures of cells were metabolically radiolabeled with Tran35S-label and the V-ATPase subsequently immunoprecipitated using...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041560106
更新日期:1993-07-01 00:00:00
abstract::The human cervical cancer (CC) has been identified as one of the most common tumors in women, and the molecular regulation in CC still remains unclear. The dysregulation of periostin has been found in a variety of cancers, but whether it is involved in the regulation of CC is unknown. The present study aimed to invest...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.28113
更新日期:2019-08-01 00:00:00
abstract::Platelet-derived growth factor (PDGF) is mitogenic and chemotactic for vascular smooth muscle cells cultured in vitro, and, thus, may play a role in the smooth muscle cell proliferation and migration that occurs during atherosclerotic lesion development. Two related PDGF polypeptides, designated as the A and B chains,...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041470116
更新日期:1991-04-01 00:00:00
abstract::Type 1 diabetes is inhibited in diabetes-prone BioBreeding (BBdp) rats fed a low-antigen hydrolyzed casein (HC) diet. In cereal-fed BBdp rats, islet expansion is defective accompanied by a futile upregulation of islet neogenesis without increased islet mass, due to a subtle blockage in islet cell cycle. We hypothesize...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22151
更新日期:2010-08-01 00:00:00
abstract::We have previously shown that 24,25-(OH)2D3 plays a major role in resting zone (RC) chondrocyte differentiation and that this vitamin D metabolite regulates protein kinase C (PKC). The aim of the present study was to identify the signal transduction pathway used by 24,25-(OH)2D3 to stimulate PKC activation. Confluent,...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4652(199612)169:3<509::AID-JCP1
更新日期:1996-12-01 00:00:00
abstract::Adrenoreceptors (ARs) are widely expressed and play essential roles throughout the body. Different subtype adrenoceptors elicit distinct effects on cell proliferation, but knowledge remains scarce about the subtype-specific effects of β2-ARs on the proliferation of embryonic pluripotent stem (PS) cells that represent ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.24937
更新日期:2015-11-01 00:00:00
abstract::Osteosarcoma (OS) is an ultra-rare highly malignant tumor of the skeletal system affecting mainly children and young adults and it is characterized by an extremely aggressive clinical course. OS patients are currently treated with chemotherapy and complete surgical resection of cancer tissue. However, resistance to ch...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.26330
更新日期:2018-06-01 00:00:00
abstract::The caspase recruitment domain (CARD)-containing proteins CARMA1-3 share high degree of sequence, structure and functional homology. Whereas CARMA1 and CARMA3 have been identified as crucial components of signal transduction pathways that lead to activation of NF-κB transcription factor, little is known about the func...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22667
更新日期:2011-12-01 00:00:00
abstract::We have described recently that expression of CD44 exon v10 (CD44v10) is down-regulated upon metastasis of squamous cell carcinoma, whereas it is up-regulated in skin metastases of malignant melanoma. The striking regulation of CD44v10 prompted us to generate a murine CD44v10-specific monoclonal antibody to define exp...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4652(199706)171:3<305::AID-JCP9
更新日期:1997-06-01 00:00:00
abstract::Cell-based cartilage resurfacing requires ex vivo expansion of autologous articular chondrocytes. Defined culture conditions minimize expansion-dependent phenotypic alterations but maintenance of the cells' differentiation potential must be carefully assessed. Transforming growth factor β-1 (TGF β-1) positively regula...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.24024
更新日期:2012-09-01 00:00:00
abstract::Inhibition of the gap-filling, polymerizing step of excision repair by 1-beta-D-arabinofuranosylcytosine (ara-C) after irradiation with ultraviolet light in human diploid fibroblasts resulted in the formation of persistent DNA strand breaks in G1, G2, and plateau phase cells, but not in S phase cells. Addition of hydr...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041080207
更新日期:1981-08-01 00:00:00
abstract::To clarify the manner by which erythropoietin (EP), stem cell factor (SCF), or insulin-like growth factor I (IGF-I) regulate erythropoiesis, apoptosis of human erythroid progenitor cells was investigated. Human burst-forming units-erythroid (BFU-E) partially purified from peripheral blood were cultured for 6 days to g...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041560207
更新日期:1993-08-01 00:00:00
abstract::Serine/threonine protein phosphatase (PP) 2A regulates many biological processes, however it remains unclear whether PP2A participates in cadherin-mediated cell-cell adhesion. We show here that the core enzyme of PP2A (PP2A-AC) is localized in the cell-cell adhesion sites between adjacent cells and associated with the...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20524
更新日期:2006-03-01 00:00:00
abstract::The development of resistance accounts for therapy failure in the majority of advanced cases of neuroblastoma in children. A new transplantable murine C-1300 neuroblastoma cell line was developed in vitro, by repeated exposure of a sensitive cell line to increasing, but sublethal, doses of Homoharringtonine (HHT). The...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041480319
更新日期:1991-09-01 00:00:00
abstract::For malignant cells cultured from a human astrocytoma, electrophysiological characteristics of the plasma membrane included specific resistivity of 446.82 +/- 279.5 ohm . cm2, specific capacitance of 0.758 +/- 0.52 microfarads/cm2, time constant 0.318 +/- 0.10 msec. The resting membrane potential averaged--14.07 +/- 7...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041050321
更新日期:1980-12-01 00:00:00
abstract::Using S1 nuclease protection assays, we have examined the representation of cell cycle-dependent H4 histone RNAs in the nuclear matrix and nonmatrix nuclear fractions of human cells. Cytoplasmic and nuclear fractions were prepared from exponentially growing HeLa S3 cells by double detergent (sodium deoxycholate and NP...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041280229
更新日期:1986-08-01 00:00:00
abstract::Suppression of PKC activity can selectively induce apoptosis in cells expressing a constitutively activated p21Ras protein. We demonstrate that continued expression of p21Ras activity is required in PKC-mediated apoptosis because farnesyltransferase inhibitors abrogated the loss of viability in p21Ras-transformed cell...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.10409
更新日期:2004-02-01 00:00:00
abstract::Aberrant glycosylation changes on many glycoproteins are often related to cancer progression and metastasis. sp2 -Iminosugar-type castanospermine analogues, inhibitors of α-glucosidases, have been reported to exhibit antitumor activity. However, their effects on cell migration and the underlying molecular mechanism ar...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.25832
更新日期:2017-12-01 00:00:00
abstract::Preincubation of human neutrophils with phorbol esters or soluble diglycerides enhances subsequent f-Met-Leu-Phe (fMLP)-stimulated arachidonate mobilization and leukotriene B4 (LTB4) synthesis. We have recently reported that 1,3-dioctanoylglycerol (1,3-diC8) is equipotent with 1,2-sn-dioctanoylglycerol (1,2-diC8) as p...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041600315
更新日期:1994-09-01 00:00:00
abstract::At 37 degrees C, undifferentiated murine teratocarcinoma cells (PCC4) are resistant to infection with SV40 and Polyoma virus. When infection is carried out at 31 degrees C, these cells become fully susceptible to a variety of polyoma virus strains, including wt, ts-a, and hr-t; they also display an increased susceptib...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041050104
更新日期:1980-10-01 00:00:00
abstract::Small hepatocytes (SHs) are a subpopulation of hepatocytes that have high growth potential in culture and can differentiate into mature hepatocytes (MHs). The activin (Act)/follistatin (Fst) system critically contributes to homeostasis of cell growth in the normal liver. ActA and ActB consist of two disulfide-linked I...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22971
更新日期:2012-06-01 00:00:00
abstract::Cell division in fertilized sea urchin eggs was reversibly inhibited when the ketoaldehyde phenyl glyoxal (PG) at a concentration of 0.1 mM was added to eggs for ten minutes prior to the formation of the mitotic spindle. We investigated whether inhibition of mitosis was due to PG binding to the cell surface (as previo...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041000119
更新日期:1979-07-01 00:00:00
abstract::NIH-3T3 cells transformed by the EJ-ras oncogene display reduced platelet-derived growth factor (PDGF)-stimulated phospholipase C activity as measured by inositol 1,4,5-triphosphate (IP3) synthesis and Ca2+ mobilization. The lack of PDGF-stimulated Ca2+ mobilization in EJ-ras transformed cells is not due to a loss of ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041390216
更新日期:1989-05-01 00:00:00
abstract::Proteolytic cleavage of extracellular matrix (ECM) and disruption of tissue architecture are fundamental features of tumor cell invasion. The proteolytic activity is focused in close proximity to the tumor cells. Here, we describe the possibility to quantify local proteolytic activity in the microenvironment of larger...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20168
更新日期:2005-03-01 00:00:00
abstract::The basic fibroblast growth factor (FGF) is a potent mitogen that has vascular endothelium as one of its principle target cells. Recent work has provided both the complete amino acid sequence of basic FGF and the nucleotide sequence of the genes for both human and bovine basic FGF. Although capillary endothelial cells...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041380116
更新日期:1989-01-01 00:00:00
abstract::Tumor ischemia participates in angiogenesis and cancer progression through cellular responses to hypoxia and nutrient deprivation. However, the contribution of amino acids limitation to this process remains poorly understood. Using serum-free cell culture conditions, we tested the impact of L-glutamine deprivation on ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21044
更新日期:2007-08-01 00:00:00
abstract::CRSBP-1 (mammalian LYVE-1) is a membrane glycoprotein highly expressed in lymphatic endothelial cells (LECs). It has multiple ligands, including hyaluronic acid (HA) and growth factors/cytokines (e.g., PDGF-BB and VEGF-A) containing CRS motifs (clusters of basic amino-acid residues). The ligand binding activities are ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.26159
更新日期:2018-04-01 00:00:00
abstract::Extracellular high K(+) (75 mM) increased intracellular Ca(2+) concentrations in cultured rat hippocampal astrocytes, and the Ca(2+) rise was abolished by deleting extracellular Ca(2+) or cadmium, a non-selective inhibitor of voltage-dependent calcium channels (VDCCs). In the reverse transcription-polymerase chain rea...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22231
更新日期:2010-11-01 00:00:00
abstract::Interleukin (IL)-37 diminishes a variety of inflammatory responses through ligation to its receptor IL-1R8/Sigirr. Sigirr is a Toll like receptor/IL-1R family member. We have shown that Sigirr is not stable in response to IL-37 treatment. IL-37-induced Sigirr degradation is mediated by the ubiquitin-proteasome system,...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.30253
更新日期:2021-01-05 00:00:00