Abstract:
:Two genes (MAT1A and MAT2A) encode for the essential enzyme methionine adenosyltransferase (MAT). MAT1A is silenced in hepatocellular carcinoma (HCC), and absence of MAT1A leads to spontaneous development of HCC in mice. Previous report correlated promoter methylation to silencing of MAT1A but definitive proof was lacking. Here we investigated the role of methylation in regulating MAT1A expression. There are three MspI/HpaII sites from -1,913 to +160 of the human MAT1A gene (numbered relative to the translational start site) at position -977, +10, and +88. Bisulfite treatment and DNA sequencing, and Southern blot analysis showed that methylation at +10 and +88, but not -977, correlated with lack of MAT1A expression. MAT1A promoter construct methylated at -977, +10 or +88 position has 0.7-fold, 3-fold, and 1.6-fold lower promoter activity, respectively. Methylation at -977 and +10 did not inhibit the promoter more than methylation at +10 alone; while methylation at +10 and +88 reduced promoter activity by 60%. Mutation of +10 and +88 sites also resulted in 40% reduction of promoter activity. Reactivation of MAT1A correlated with demethylation of +10 and +88. In vitro transcription assay showed that methylation or mutation of +10 and +88 sites reduced transcription. In conclusion, our data support the novel finding that methylation of the MAT1A coding region can inhibit gene transcription. This represents a key mechanism for decreased MAT1A expression in HCC and a target for therapy. To our knowledge, this is the first example of coding region methylation inhibiting transcription of a mammalian gene.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Tomasi ML,Li TW,Li M,Mato JM,Lu SCdoi
10.1002/jcp.22875subject
Has Abstractpub_date
2012-04-01 00:00:00pages
1583-91issue
4eissn
0021-9541issn
1097-4652journal_volume
227pub_type
杂志文章abstract::The hypothesis of functional hemizygosity has been examined for the alpha-amanitin resistant (AmaR, a codominant marker) locus in a series of Chinese hamster cell lines. AmaR mutants were obtained from different cell lines, e.g., CHO, DHW, M3- 1 and CHO-Kl, at similar frequencies. After fractionation of different RNA ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1040970321
更新日期:1978-12-01 00:00:00
abstract::Insulin-like growth factor-I receptor (IGF-IR) is often overexpressed in malignant tumors, and is involved in the establishment and maintenance of malignant phenotypes. Tyrosine kinase receptor endocytosis is commonly triggered by ligand binding and occurs via clathrin-coated vescicles that transfer the receptor to th...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20670
更新日期:2006-08-01 00:00:00
abstract::Hyaluronan (HA) accumulates in vascular disease but its functional role is not fully understood. To investigate the impact of HA enriched extracellular matrices (ECM) on cell phenotype, arterial smooth muscle cells (ASMCs) were transduced with retroviral constructs (LXSN) encoding murine has-1, has-2, and has-3. HA sy...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20468
更新日期:2006-02-01 00:00:00
abstract::Heart failure is a major cause of death throughout the world. Hyperthyroidism has been shown to induce cardiac hypertrophy, which is a contributing factor to heart failure. However, the mechanism underling effect of thyroid hormone is not completely clear. The present study investigates the role of peroxisome prolifer...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.24015
更新日期:2012-09-01 00:00:00
abstract::Nucleotide receptors signaling affects cell proliferation, with possible implications on tumorigenic processes. However, molecular targets and action mechanisms of the extracellular nucleotides are still poorly elucidated. We have previously shown in ARO cells that APE1/Ref-1, a transcriptional coactivator responsible...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20704
更新日期:2006-10-01 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::p53-mediated apoptosis involves multiple mechanisms. A number of p53-regulated apoptosis-related genes have been identified. Some of these genes encode proteins that are important in controlling the integrity of mitochondria while the others code for membrane death receptors. p53 may also induce apoptosis by interferi...
journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
doi:10.1002/(SICI)1097-4652(200002)182:2<171::AID-JCP5
更新日期:2000-02-01 00:00:00
abstract::The transcriptional factors implicated in the expression of the intermediate filament protein nestin in cardiomyocytes during embryogenesis remain undefined. In the heart of 9,5-10,5 day embryonic mice, nestin staining was detected in atrial and ventricular cardiomyocytes and a subpopulation co-expressed Tbx5. At late...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.26165
更新日期:2018-04-01 00:00:00
abstract::[3H]Ouabain specifically bound at sublethal concentrations to Na,K-ATPase on the surface of HeLa cells is taken up (internalized) by the cells at a rate of three membrane equivalents of labeled sites per generation. Immediately following a pulse label with the glycoside, codistribution of radioactivity with the surfac...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041100114
更新日期:1982-01-01 00:00:00
abstract::Galectins play key roles in the inflammatory cascade. In this study, we aimed to analyze the effect of galectin-1 (Gal-1) in the function of intestinal epithelial cells (IECs) isolated from healthy and inflamed mucosa. IECs isolated from mice or patients with inflammatory bowel diseases (IBD) were incubated with diffe...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.25249
更新日期:2016-07-01 00:00:00
abstract::Histone deacetylases (HDACs) play a crucial role in the regulation of gene expression through remodeling of chromatin structures. However, the molecular mechanisms involved in this event remain unknown. In this study, we sought to examine whether HDAC inhibition-mediated protective effects involved HDAC4 sumoylation, ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.24871
更新日期:2015-06-01 00:00:00
abstract::Estrogens mediate gene transcription and signaling of numerous cellular processes in a variety of tissues, including the bone, breast, and endometrium, through binding and activation of estrogen receptors (ERs). Estrogen-mediated ER agonist activity has shown benefit in conditions related to estrogen deficiency in wom...
journal_title:Journal of cellular physiology
pub_type: 杂志文章,评审
doi:10.1002/jcp.24324
更新日期:2013-07-01 00:00:00
abstract::Growth-contingent alterations in potassium and sodium fluxes, ouabain binding, and potassium ion content were examined following serum stimulation of quiescent, density-inhibited chicken embryo fibroblasts. Serum stimulation resulted in very rapid 1.5- to 1.8-fold increases in ouabain-sensitive potassium influx and le...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041030222
更新日期:1980-05-01 00:00:00
abstract::The possibility that one or both of the synthetic triamines, 1,3,6-triaminohexane and 1,4,7-triaminoheptane, could substitute for the naturally occurring polyamines in the growth of SV-3T3 cells was investigated. It was found that these triamines did lead to a restoration of growth in cells in which spermidine content...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041270219
更新日期:1986-05-01 00:00:00
abstract::Dietary fiber has been suggested to suppress colorectal cancer development, although the mechanisms contributing to this beneficial effect remain elusive. Butyrate, a fermentation product of fiber, has been shown to have anti-proliferative and pro-apoptotic effects on colorectal cancer cells. The metabolic fate of but...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.25287
更新日期:2016-08-01 00:00:00
abstract::This study investigated whether brain-derived neurotrophic factor (BDNF) regulates the L-glutamate/L-aspartate transporter (GLAST) and glutamine synthetase (GS) in mouse retinal Müller cells (RMCs) under normal and hypoxic conditions. Mouse RMCs were treated with recombinant human BDNF (50, 75, 100, 125, or 150 ng/ml...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22762
更新日期:2012-02-01 00:00:00
abstract::Simian Virus 40 (SV40), a monkey polyomavirus, was administered to human populations by early anti-poliomylitis vaccines contaminated by this small DNA tumor virus. Data on SV40 infection in humans remain controversial. Elderly subjects represent an interesting cohort to investigate, because they were not immunized wi...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.25405
更新日期:2017-01-01 00:00:00
abstract::Osteoclasts are multinucleated cells formed by fusion of preosteoclasts (POCs) derived from cells of the monocyte/macrophage lineage. We have reported a culture system that supports the formation of POCs from stroma-depleted rat bone marrow cells. Global gene expression analysis of this culture system identified genes...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.26147
更新日期:2018-04-01 00:00:00
abstract::Despite the advantages of transplantation of umbilical cord blood's (UCB's) hematopoietic stem cells (uHSCs) for hematologic malignancy treatment, there are two major challenges in using them: (a) Insufficient amount of uHSCs in a UCB unit; (b) a defect in uHSCs homing to bone marrow (BM) due to loose binding of their...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.28825
更新日期:2019-12-01 00:00:00
abstract::This study examined the role of agonist-induced Rho kinase (ROCK) involvement in the morphological outcome of pulmonary-derived fibroblasts. Normal human lung fibroblasts (NHLF) spontaneously differentiate into network-like structures in a two-dimensional growth factor reduced Matrigel matrix-based assay. Sphingosine ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.20939
更新日期:2007-05-01 00:00:00
abstract::The role of individual supplements necessary for the long-term self-renewal of embryonic stem (ES) cells is poorly characterized in feeder/serum-free culture systems. This study sought to characterize the relationship between the effects of glucose on ES cell proliferation and fibronectin (FN) synthesis, and to assess...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22048
更新日期:2010-05-01 00:00:00
abstract::The beneficial effects of light-emitting diode (LED) irradiation have been reported in various pathologies, including cancer. However, its effect in pancreatic cancer cells remains unclear. Herein, we demonstrated that blue LED of 460 nm regulated pancreatic cancer cell proliferation and apoptosis by suppressing the e...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.29943
更新日期:2021-02-01 00:00:00
abstract::Cells from kidney proximal tubules have been successfully isolated, characterized, and cultured from male Fischer 344 rats between 150-400 g using a two-step collagenase perfusion. The cells undergo high levels of DNA synthesis and mitosis in both serum free media (with an without hormone supplementation) and media co...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041310116
更新日期:1987-04-01 00:00:00
abstract::Plasminogen activator inhibitor-1 (PAI-1) is known as an inhibitor of fibrinolytic system. Previous studies suggest that PAI-1 is involved in the pathogenesis of osteoporosis induced by ovariectomy, diabetes, and glucocorticoid excess in mice. However, the roles of PAI-1 in early-stage osteogenic differentiation have ...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.27655
更新日期:2019-06-01 00:00:00
abstract::Arginine vasopressin (AVP) regulates glomerular hemodynamics, alters extracellular matrix production, and induces proliferation of glomerular mesangial cells (MCs). Therefore, AVP may play a role in glomerular sclerosis and the progression of chronic renal failure. To investigate changes in early gene expression which...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041590214
更新日期:1994-05-01 00:00:00
abstract::Fluorescence anisotropy measurements are widely used as sensitive indicators of cell membrane fluidity. 1-[4-(trimethylamino)phenyl]-6-phenyl hexa-1,3,5-triene (TMA-DPH) is a cationic fluorescent aromatic hydrocarbon that anchors at the lipid-water interface of membrane lipid bilayers. Its uptake into porcine pulmonar...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041340114
更新日期:1988-01-01 00:00:00
abstract::The endocannabinoid system (ECS) is activated at the onset of obesity and diverse metabolic diseases. Endocannabinoids mediate their physiological and behavioral effects by activating specific cannabinoid receptors, mainly cannabinoid receptor 1 (CB(1)R). Diabetic nephropathy (DN) is induced by hyperlipidemia, and ren...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22255
更新日期:2010-11-01 00:00:00
abstract::Erythropoietin (EPO), the key hormone for erythropoiesis, also increases nitric oxide (NO) bioavailability in endothelial cells (ECs), yet the definitive mechanisms are not fully understood. Increasing evidence has demonstrated that β common receptor (βCR) plays a crucial role in EPO-mediated non-hematopoietic effects...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.22678
更新日期:2011-12-01 00:00:00
abstract::Leukemic cells in the myeloblastic stage from a murine myeloid leukemia cell line (M1) were induced to differentiate to macrophages by lipopolysaccharide (LPS) from Gram-negative bacteria. A granulocyte-macrophage colony-stimulating factor (CSF) was produced only during differentiation. After induction of differentiat...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.1041020307
更新日期:1980-03-01 00:00:00
abstract::Optimal stimulation of signal transduction and biological functions by IGF-I in porcine smooth muscle cells (pSMC) requires ligand occupancy of the alphaVbeta3 integrin. Binding of heparin-binding domain (HBD) of vitronectin (VN) to the cysteine loop (C-loop) region of beta3 is required for pSMC to respond optimally t...
journal_title:Journal of cellular physiology
pub_type: 杂志文章
doi:10.1002/jcp.21196
更新日期:2008-02-01 00:00:00