Abstract:
:The mouse macrophage Fc gamma 2b/gamma 1R has previously been purified with the aid of the monoclonal antibody 2.4G2. That this Fc gamma R functions as a ligand-dependent ion channel is supported by the following evidence. Employing [3H]tetraphenylphosphonium ([3H]Ph4P+) as a probe for membrane potential changes in intact cells, we found a biphasic change in membrane potential following treatment with immune complexes, monoclonal antibody 2.4G2 IgG and 2.4G2 Fab-Sephadex particles. We observed an immediate depolarization followed by prolonged hyperpolarization. [3H]Ph4P+ uptake experiments with plasma membrane vesicles prepared from J774 macrophages showed that binding of ligands to the FcR led to transmembrane monovalent cation flow. Similar [3H]Ph4+ uptake experiments were done with phospholipid vesicles containing purified and reconstituted Fc gamma 2b/gamma. Following challenge with specific ligands, transmembrane monovalent cation flow was observed. Purified FcR was reconstituted into planar lipid bilayers; exposure to ligands led to transient bilayer conductance increase. THe conductance change was resolved into single channel events. Quin-2 measurements showed an increase of free cytosolic calcium levels in macrophages following exposure of cells to different ligands of the FcR. An optimal range of calcium was found to be required for phagocytosis, below and above which inhibition of ingestion occurred.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Young JD,Unkeless JC,Cohn ZAdoi
10.1002/jcb.240290403subject
Has Abstractpub_date
1985-01-01 00:00:00pages
289-97issue
4eissn
0730-2312issn
1097-4644journal_volume
29pub_type
杂志文章,评审abstract::Myelin basic protein (MBP) is a major component of the myelin sheath whose production is developmentally controlled during myelinogenesis. Earlier studies have indicated that programmed expression of the MBP gene is regulated at the level of transcription. Evidently, the MB1 regulatory motif located between nucleotide...
journal_title:Journal of cellular biochemistry
pub_type: 杂志文章
doi:10.1002/(sici)1097-4644(19970915)66:4<524::aid-jcb
更新日期:1997-09-15 00:00:00
abstract::To obtain sufficient numbers of cells for tissue engineering applications, human bone marrow-derived mesenchymal stem cells (hBM-MSC) are commonly cultured as monolayers in incubators containing room air. In this study, we investigated whether three-dimensional (3D) culture conditions and incubator gas concentrations ...
journal_title:Journal of cellular biochemistry
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abstract::Gastric cancer (GC) is the fifth most frequent cancer and the third-leading cause of cancer-related death worldwide. It is a highly heterogeneous disease regarding the morphological and molecular viewpoints. Since it is curable in primary stages, early detection could improve the survival rate. Long noncoding RNAs con...
journal_title:Journal of cellular biochemistry
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abstract::Tetralogy of Fallot (TOF) is the most common form of cyanotic congenital heart disease. To identify endogenous peptides possibly involved in the progression of TOF, we performed comparative peptidomic profiling of maternal serum between normal fetuses and fetuses suffering from TOF. A total of 278 differentially expre...
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journal_title:Journal of cellular biochemistry
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journal_title:Journal of cellular biochemistry
pub_type: 杂志文章
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abstract::Genistein, a natural isoflavone phytoestrogen present in soybeans, caused a dose-dependent growth inhibition of the two hormone-sensitive cell lines T47D and ZR75.1 and of the two hormone-independent cell lines MDAMB-231 and BT20. Flow cytometric analysis of cells treated for 4 days with 15 and 30 microM genistein sho...
journal_title:Journal of cellular biochemistry
pub_type: 杂志文章
doi:
更新日期:2000-09-14 00:00:00
abstract::Individual protein kinase C (PKC) isoforms fulfill distinct roles in the regulation of the commitment to differentiation, cell cycle arrest, and apoptosis in both monocytes and T-cells. The human monocyte like cell line U937 and T-cells were exposed to microgravity, during spaceflight and the translocation (a critical...
journal_title:Journal of cellular biochemistry
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abstract::Platelets are critical regulators of liver regeneration, but the mechanisms are still not fully understood. Platelets have been shown to contain a wide variety of microRNAs (miRNAs) and play an important role in many diseases. However, the mechanism that how the platelet microparticles (PMPs)-derived miRNA regulate th...
journal_title:Journal of cellular biochemistry
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journal_title:Journal of cellular biochemistry
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journal_title:Journal of cellular biochemistry
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abstract::Oxidative stress is an important underlying cause of many disease processes and may arise due to either increasing free radical generation or decreasing antioxidant defense systems. MicroRNAs (miRs) are 22-nucleotide non-coding RNAs that may regulate many intracellular processes; and, more recently, they have been imp...
journal_title:Journal of cellular biochemistry
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abstract::LipN (Rv2970c) belongs to the Lip family of M. tuberculosis H37Rv and is homologous to the human Hormone Sensitive Lipase. The enzyme demonstrated preference for short carbon chain substrates with optimal activity at 45°C/pH 8.0 and stability between pH 6.0-9.0. The specific activity of the enzyme was 217 U/mg protein...
journal_title:Journal of cellular biochemistry
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journal_title:Journal of cellular biochemistry
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journal_title:Journal of cellular biochemistry
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journal_title:Journal of cellular biochemistry
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abstract::Muscular dystrophies are characterized by continuous cycles of degeneration and regeneration that result in extensive fibrosis and a progressive diminution of muscle mass. Cell surface heparan sulfate proteoglycans are found almost ubiquitously on the surface and in the extracellular matrix (ECM) of mammalian cells. T...
journal_title:Journal of cellular biochemistry
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abstract::The conditions favoring expression of a reporter gene microinjected into a male pronucleus of naturally ovulated and fertilized rabbit eggs have been studied. Injection of the reporter gene during S phase of the cell-cycle allows the highest level of expression of the gene. Incorporation of DNA loop anchorage regions ...
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