Abstract:
:We describe the isolation and characterization of a Chinese hamster ovary cell line selected for resistance to N-carbamoyloxyurea. Using the mammalian cell permeabilization assay developed in our laboratory, a detailed analysis of the target enzyme, ribonucleotide reductase (EC 1.17.4.1), was carried out. Both drug-resistant and parental wild-type cells required the same optimum conditions for enzyme activity. The Ki values for N-carbamoyloxyurea inhibition of CDP reduction were 2.0 mM for NCR-30A cells and 2.3 mM for wild-type cells, while the Ki value for ADP reduction was 2.3 mM for both cell lines. Although the Ki values remained essentially unchanged, the Vmax values for NCR-30A cells were 1.01 nmoles dCDP formed/5 X 10(6) cells/hour and 1.83 nmoles dADP/5 X 10(6) cells/hour, while those for the wild-type cells were 0.49 nmoles dCDP produced/5 X 10(6) cells/hour and 1.00 nmoles dADP/5 X 10(6) cells/hour. This approximate twofold increase in reductase activity as least partially accounts for a 2.6-fold increase in D10 value for cellular resistance to N-carbamoyloxyurea exhibited by NCR-30A cells. The NCR-30A cell line was also cross-resistant to the antitumor agents, hydroxyurea and guanazole. No differences in Ki values for inhibition of CDP and ADP reduction by these two drugs were detected and cellular resistance could be entirely accounted for by the elevation in activity of the reductase in the NCR-30A cell line. The properties of N-carbamoyloxyurea-resistance cells indicate they should be useful for further investigations into the regulation of mammalian enzyme activity.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Hards RG,Wright JAdoi
10.1002/jcp.1041060218subject
Has Abstractpub_date
1981-02-01 00:00:00pages
309-19issue
2eissn
0021-9541issn
1097-4652journal_volume
106pub_type
杂志文章abstract::A variant of the hypoxanthine-guanine phosphoribosyltransferase deficient, and adenine phosphoribosyltransferase deficient mouse resistant to 6-azauridine. These cells are not only resistant to 6-azauridine (5 X 10(-4) M), but also to adenosine (10(-3) M). Resistance persists indefinitely even in the absence of both c...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1040860202
更新日期:1975-10-01 00:00:00
abstract::Activation of the epidermal growth factor receptor (EGFR) contributes to the pathogenesis of non-small-cell lung carcinomas (NSCLC) and gefitinib, a selective reversible EGFR inhibitor, is effective in treating patients with NSCLC. However, clinical resistance to gefitinib is a frequent occurrence highlighting the nee...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20906
更新日期:2007-02-01 00:00:00
abstract::Excessive generation of mitochondrial reactive oxygen species (ROS) is considered to be initiating event in the development of diabetic nephropathy (DN). Mitochondrial biosynthesis mediated by coactivator PGC-1α and its downstream transcription factors NRF1 and TFAM may be a key target in maintaining mitochondrial fun...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.27306
更新日期:2019-04-01 00:00:00
abstract::Estrogen has been shown to protect osteoblastic cells from apoptosis. Similarly, estrogen treatment preceding heat shock elevates heat shock protein 27 (hsp27) expression and increases thermoresistance in the murine estrogen receptor-transformed SMER14 osteoblastic cell line. Forced expression of hsp27 expression in o...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/1097-4652(200012)185:3<401::AID-JCP10>3.0.
更新日期:2000-12-01 00:00:00
abstract::Dermal fibroblasts exposed to low oxygen tension show upregulated synthesis of transforming growth factor-beta 1 (TGF-beta 1), an established stimulatory peptide in the formation of extracellular matrix proteins. In this report, procollagen synthesis was measured in cultures of confluent adult human dermal fibroblasts...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041570225
更新日期:1993-11-01 00:00:00
abstract::The toxicity of cationic fluorescent dye, rhodamine 123, towards a number of independently established cell lines from three different species, namely human, mouse, and Chinese hamster, has been examined. All of the cell lines from any one species that were examined were found to exhibit similar sensitivities towards ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041300303
更新日期:1987-03-01 00:00:00
abstract::Stimulation of amiloride-sensitive sodium (Na+) influx and the subsequent activation of NA+, K+-ATPase by serum or growth factors have been implicated as early events leading to initiation of cell proliferation. We recently demonstrated that amiloride inhibits thrombin-initiated DNA synthesis not by inhibiting an earl...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041200305
更新日期:1984-09-01 00:00:00
abstract::Protein sorting through vesicular compartments is highly regulated to maintain the integrity and signaling of intracellular organelles in eukaryotic cells. Sorting Nexin-2 (SNX2) is involved in protein sorting in the trans-Golgi network, endosome, and/or lysosome compartments, with loss of function leading to defect i...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20285
更新日期:2005-07-01 00:00:00
abstract::We have examined the transport of amino acids by the sodium-dependent "A" and "ASC" system in thymic- and splenic-derived lymphocytes from the Long-Evans rat. Lymphocytes derived from the thymus transport amino acids by both the "A" and "ASC" systems, whereas lymphocytes from the spleen transport amino acids by the "A...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1040970205
更新日期:1978-11-01 00:00:00
abstract::The unique vascular supply of the retina, the ability to visualize the vasculature in vivo, and the ability to selectively express genes in the retina make the retina an ideal model system to study molecular mechanisms of angiogenesis. In addition, this area of investigation has great clinical significance, because re...
journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
doi:10.1002/1097-4652(200009)184:3<301::AID-JCP3>3.0.C
更新日期:2000-09-01 00:00:00
abstract::Invasion of tumor cells is the primary cause of therapeutic failure in the treatment of malignant chondrosarcomas. Glial cell-derived neurotrophic factor (GDNF) plays a crucial role in migration and metastasis of human cancer cells. Integrins are the major adhesive molecules in mammalian cells. Here we found that GDNF...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21802
更新日期:2009-08-01 00:00:00
abstract::As a natural metabolite of limonoids from Dictamnus dasycarpus, fraxinellone has been reported to be neuroprotective and anti-inflammatory. However, its influence on cellular metabolism remains largely unknown. In the present study, we investigated the effect of fraxinellone on cellular senescence-induced by oxidative...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.26169
更新日期:2018-05-01 00:00:00
abstract::Release of transcellular tension upon disruption of actin stress fibers with cytochalasin D (CD) and associated changes in cell morphology are reflected in the rapid transcription of "deformation-responsive" genes. For certain genes (e.g., urokinase plasminogen activator and its type-1 inhibitor PAI-1), de novo mRNA s...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.10247
更新日期:2003-06-01 00:00:00
abstract::The neuropeptide pituitary adenylate cyclase-activating polypeptide (PACAP), a member of the glucagon/vasoactive intestinal peptide (VIP) superfamily, stimulates cyclic AMP accumulation initiating a variety of biological processes such as: neurotropic actions, immune and pituitary function, learning and memory, catech...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21831
更新日期:2009-10-01 00:00:00
abstract::Endoplasmic reticulum (ER) stress, a common cellular stress response, is closely related to the activation of autophagy that is an important and evolutionarily conserved mechanism for maintaining cellular homeostasis. Autophagy induced by ER stress mainly includes the ER stress-mediated autophagy and ER-phagy. The ER ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
doi:10.1002/jcp.26137
更新日期:2018-05-01 00:00:00
abstract::We have previously observed major differences in the phosphorylation of membrane proteins in sparse, proliferating versus confluent, quiescent pig aortic endothelial cells (EC) (Kazlauskas and DiCorleto, 1987). In the present study we examined whether EC growth state can influence the activity of a specific phosphoryl...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041360306
更新日期:1988-09-01 00:00:00
abstract::As a typical hibernator, the Daurian ground squirrel (Spermophilus dauricus) spends considerable time in a state of reduced activity with prolonged fasting. Despite this, they experience little muscle atrophy and have thus become an interesting anti-disuse muscle atrophy model. The IKKβ/NF-κB signaling pathway is sign...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.26751
更新日期:2018-11-01 00:00:00
abstract::rac-1-O-Myristoyl-2-O-acetylglycerol, rac-1-O-palmitoyl-2-O-acetylglycerol, and rac-1-O-oleoyl-2-O-acetylglycerol acted like phorbol myristate acetate and mezerein in stimulating human neutrophil aggregation. Responses to these agents were equally influenced by cytochalasin B, extracellular calcium and magnesium, arac...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041250204
更新日期:1985-11-01 00:00:00
abstract::The pregnane X receptor (PXR, NR1I2) is a ligand-activated nuclear receptor which plays an essential role in organism's metabolic detoxification system by sensing the presence of xenobiotics and triggering detoxification responses. In addition to its role in xenobiotic metabolism, PXR has pleiotropic functions in regu...
journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
doi:10.1002/jcp.24838
更新日期:2015-04-01 00:00:00
abstract::The present study extends our previous observation (Kasambalides and Lanks, J. Cell. Physiol., 114:93-98, 1983), that dexamethasone inhibits the alterations in heat shock protein (HSP) and glucose-regulated protein (GRP) synthesis caused by glucose deprivation. We now show that insulin, even in the presence of high ex...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041230220
更新日期:1985-05-01 00:00:00
abstract::Studies were conducted to explore hormonal and nutritional factors that might be involved in the regulation of retinol-binding protein (RBP) synthesis and secretion by the liver. The studies employed primary cultures of hepatocytes from normal rats. When cells were cultured in Dulbecco's modified Eagle's medium alone,...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041300103
更新日期:1987-01-01 00:00:00
abstract::Proteasome inhibitors represent a promising therapy for the treatment of relapsed and/or refractory multiple myeloma, a disease that is concomitant with osteolysis and enhanced osteoclast formation. While blockade of the proteosome pathway has been recently shown to influence osteoclast formation and function, the pre...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21787
更新日期:2009-08-01 00:00:00
abstract::Differentiation commitment events are essential for the initiation of hemopoiesis and, in one form or another, occur continuously during adult hemopoiesis. The most studied type of differentiation commitment decision a hemopoietic cell can make involves the alternative choice of self-renewal versus the formation of pr...
journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
doi:10.1002/(SICI)1097-4652(199711)173:2<131::AID-JCP9
更新日期:1997-11-01 00:00:00
abstract::Five-week-old female mice supplemented with estradiol and progesterone are able to respond to epidermal growth factor (EGF) and EGF-like growth factors (alpha-transforming growth factor [alpha-TGF] and crude mammary-derived growth factor) with local lobuloalveolar development when these growth factors are directly int...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041320324
更新日期:1987-09-01 00:00:00
abstract::Transforming growth factor beta type 1 (TGF-beta 1) was reacted with NHS-biotin to yield a derivative of TGF-beta 1 which was biotinylated on lysine residues. The biotinylated form of TGF-beta 1 was separated from the unreacted material by reverse phase chromatography. In three separate bioassays, the derivatized pept...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041410125
更新日期:1989-10-01 00:00:00
abstract::Scatchard analysis of binding of 125I-basic fibroblast growth factor (FGF) to baby hamster kidney (BHK) cells revealed the presence of two binding sites: a high affinity site with KD of 20 pM and 80,000 sites per cell and a low affinity site with KD of about 2 nM and 600,000 sites per cell. The binding to the two site...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041310118
更新日期:1987-04-01 00:00:00
abstract::Cell cycle-related changes in the ability to regulate cell volume following hyposmotic swelling were studied in mouse fibroblasts using videomicroscopy and the whole-cell patch clamp technique. Regulatory volume decrease (RVD) and volume-sensitive Cl- conductance (G(Cl,vol)) were measured: (1) in proliferating cells o...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/1097-4652(200104)187:1<65::AID-JCP1052>3.0
更新日期:2001-04-01 00:00:00
abstract::Neuronal activity-dependent gene transcription is a key feature of long-lasting synaptic strengthening associated with learning and memory, as well as activity-dependent neuroprotection. To comprehensively determine the molecular alterations, we carried out genome-wide microarray analysis in cultured rat cortical neur...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21008
更新日期:2007-07-01 00:00:00
abstract::The plasma membrane of erythrocytes, as of other cells, is thought to act as the barrier responsible for maintaining intracellular gradients of most ions and small molecular species between the cell and its environment. Controlled application of the nonionic detergent Brij 58 effectively opened the erythrocyte plasma ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041590202
更新日期:1994-05-01 00:00:00
abstract::Dose-response curves for the inhibition of heterogeneous nuclear RNA (hnRNA) synthesis in HeLa cells by 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole (DRB; 5-100 microM; 30 min) are biphasic and indicate the existence of two subpopulations of hnRNA molecules, one highly sensitive and the other completely resistant,...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041160106
更新日期:1983-07-01 00:00:00