Abstract:
:The existing cytometric methodologies do not allow one to directly correlate, within the same cells, functional cell attributes that are revealed supravitally with features that require cell fixation to be detected or measured. Taking advantage of the "file merge" feature of the laser-scanning cytometer, we have been able to correlate the supravital changes that occur during apoptosis, namely the drop in mitochondrial transmembrane potential (Delta Psim) and generation of the reactive oxygen intermediates (ROIs), with features revealed by analysis of fixed cells: the cell cycle position and DNA fragmentation. The cell cycle position was established based on the cell's stainability with propidium iodide while DNA fragmentation was assessed by in situ DNA strand break labeling using exogenous terminal deoxynucleotidyltransferase. During apoptosis of HL-60 cells induced by the DNA topoisomerase I inhibitor camptothecin (CPT), the dissipation of Delta Psim occurred preferentially in S-phase cells and preceded the appearance of DNA strand breaks. Essentially all cells with DNA strand breaks had dissipated Delta Psim. Compared to the decrease of Delta Psim, the CPT-induced rise in ROIs during apoptosis was less restricted to S-phase cells. Furthermore, no elevation of ROIs was detected in a significant proportion of cells with DNA strand breaks. The data suggest that DNA fragmentation may occur in some cells prior to the increase in ROIs and thus, unlike the dissipation of Delta Psim, the oxidative stress may not be a prerequisite for activation of an endonuclease. Alternatively, the oxidative stress may be a transient event, occupying a narrow "time window" during the apoptotic process. The approach opens a possibility to study direct relationships, within the same cells, between cellular changes (e.g., occurring during apoptosis, mitogenesis, differentiation, etc.) detected by functional assays of live cells and changes that cannot be analyzed supravitally.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Li X,Darzynkiewicz Zdoi
10.1006/excr.1999.4525keywords:
subject
Has Abstractpub_date
1999-06-15 00:00:00pages
404-12issue
2eissn
0014-4827issn
1090-2422pii
S0014-4827(99)94525-1journal_volume
249pub_type
杂志文章abstract::We previously identified a novel centrosomal protein CPAP, which carries a 112-residue motif that is essential for microtubule destabilization. In this report, we define both the microtubule (MT) binding and destabilizing domains in human CPAP and analyze the mutations that affect its MT-destabilizing activity. Analys...
journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1016/j.yexcr.2008.05.012
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abstract::Developmental studies have demonstrated that the vascular smooth muscle cells (VSMC) present within the elastic arteries are differentiated from two definitive origins, the neural crest and the mesoderm. Cells from these distinct progenitors differ in their ability to determine long-range spatial order of the extracel...
journal_title:Experimental cell research
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journal_title:Experimental cell research
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journal_title:Experimental cell research
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doi:10.1006/excr.2002.5501
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journal_title:Experimental cell research
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journal_title:Experimental cell research
pub_type: 杂志文章
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journal_title:Experimental cell research
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1016/j.yexcr.2008.06.001
更新日期:2008-08-15 00:00:00
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journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1006/excr.2002.5669
更新日期:2003-01-01 00:00:00
abstract::In dog thyrocytes in primary culture, thyrotropin (TSH), acting through cyclic AMP, induces proliferation and differentiation expression, while tetradecanoylphorbol acetate (TPA) or epidermal growth factor (EGF) induces proliferation and dedifferentiation. In this work, we have investigated the regulation of mRNA expr...
journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1006/excr.1994.1294
更新日期:1994-10-01 00:00:00
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journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1006/excr.1996.0123
更新日期:1996-04-10 00:00:00
abstract::The structure of a tissue engineering scaffold plays an important role in modulating tissue growth. A novel gelatin-chitosan (Gel-Cs) scaffold with a unique structure produced by three-dimensional printing (3DP) technology combining with vacuum freeze-drying has been developed for tissue-engineering applications. The ...
journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1016/j.yexcr.2014.02.028
更新日期:2014-05-01 00:00:00
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journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1016/0014-4827(84)90197-6
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abstract::Cisplatin resistance in cancer cells is due to a pleiotropic phenotype transition that allows cells to resist cell death. miRNAs have been shown to be reliable markers of phenotype, critical in cell differentiation, and dysregulated in cancer and other pathologies. Here we investigate the influence of miRNA on cisplat...
journal_title:Experimental cell research
pub_type: 杂志文章
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更新日期:2013-02-15 00:00:00
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journal_title:Experimental cell research
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journal_title:Experimental cell research
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journal_title:Experimental cell research
pub_type: 杂志文章
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journal_title:Experimental cell research
pub_type: 杂志文章,评审
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更新日期:1999-11-25 00:00:00
abstract::A new beta 1-containing integrin was isolated from rat liver by affinity chromatography on Sepharose conjugated with the peptide GRGDSPC. The interaction was weakened but not abolished when the arginine and/or aspartic acid in the peptide were replaced with lysine and glutamic acid, respectively. In contrast, the cyst...
journal_title:Experimental cell research
pub_type: 杂志文章
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abstract::K252a, a protein kinase inhibitor, acts as a neurotrophic factor in several neuronal cells. In this study we show that K252a enhanced the differentiation of C2C12 myoblasts as well as tyrosine phosphorylation of several focal adhesion-associated proteins including p130(Cas), focal adhesion kinase, and paxillin. The ty...
journal_title:Experimental cell research
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abstract::Calcium-tolerant myocytes were isolated from adult rat hearts by collagenase perfusion and plated on various substrates in serum-free medium and their adhesion to various extracellular matrix (ECM) components was determined. The myocytes attached readily to dishes coated with collagen type IV (C-IV), laminin (LN), and...
journal_title:Experimental cell research
pub_type: 杂志文章
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journal_title:Experimental cell research
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journal_title:Experimental cell research
pub_type: 杂志文章,评审
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abstract::Local regulation of the cortical cytoskeleton controls cell surface dynamics. GAP-43 and MARCKS are two abundant cytosolic protein kinase C substrates that are anchored to the cell membrane via acyl groups and interact with the cortical cytoskeleton. Each of them has been implicated in several forms of motility involv...
journal_title:Experimental cell research
pub_type: 杂志文章
doi:10.1006/excr.1997.3709
更新日期:1997-10-10 00:00:00