101
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England K, Cotter T. Identification of carbonylated proteins by MALDI-TOF mass spectroscopy reveals susceptibility of ER. Biochem Biophys Res Commun 2004; 320:123-30. [PMID: 15207711 DOI: 10.1016/j.bbrc.2004.05.144] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2004] [Indexed: 11/16/2022]
Abstract
Reactive oxygen species are produced by metabolism over time, but can also be produced in more acute conditions of cell stress such as treatment with cytotoxic drugs. Treatment of HL-60 cells with peroxide results in cell death and protein carbonylation, a non-enzymatic protein modification that typically results from oxidative stress within cells. It has recently become clear that protein carbonylation during ageing is confined to specific proteins. It is therefore of interest to be able to identify which proteins are susceptible to protein carbonylation. Here we demonstrate immunoprecipitation of carbonylated proteins coupled with 2D-gel electrophoresis to identify carbonylated proteins by MALDI-TOF m/s fingerprinting. The results show that some ER proteins are readily carbonylated in response to peroxide treatment of HL-60 cells. This is likely to have implications for the induction of cell death in such cells.
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Affiliation(s)
- K England
- Department of Biochemistry, Biosciences Institute, University College Cork, Cork, Ireland.
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102
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Hayashi Y, Kondo T, Zhao QL, Ogawa R, Cui ZG, Feril LB, Teranishi H, Kasuya M. Signal transduction of p53-independent apoptotic pathway induced by hexavalent chromium in U937 cells. Toxicol Appl Pharmacol 2004; 197:96-106. [PMID: 15163545 DOI: 10.1016/j.taap.2004.02.011] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2003] [Accepted: 02/24/2004] [Indexed: 11/21/2022]
Abstract
It has been reported that the hexavalent chromium compound (Cr(VI)) can induce both p53-dependent and p53-independent apoptosis. While a considerable amount of information is available on the p53-dependent pathway, only little is known about the p53-independent pathway. To elucidate the p53-independent mechanism, the roles of the Ca(2+)-calpain- and mitochondria-caspase-dependent pathways in apoptosis induced by Cr(VI) were investigated. When human lymphoma U937 cells, p53 mutated cells, were treated with 20 microM Cr(VI) for 24 h, nuclear morphological changes and DNA fragmentation were observed. Production of hydroxyl radicals revealed by electron paramagnetic resonance (EPR)-spin trapping, and increase of intracellular calcium ion concentration monitored by digital imaging were also observed in Cr(VI)-treated cells. An intracellular Ca(2+) chelator, BAPTA-AM, and calpain inhibitors suppressed the Cr(VI)-induced DNA fragmentation. The number of cells showing low mitochondrial membrane potential (MMP), high level of superoxide anion radicals (O(2)(-)), and high activity of caspase-3, which are indicators of mitochondria-caspase-dependent pathway, increased significantly in Cr(VI)-treated cells. An antioxidant, N-acetyl-l-cysteine (NAC), decreased DNA fragmentation and inhibited the changes in MMP, O(2)(-) formation, and activation of caspase-3 induced by Cr(VI). No increase of the expressions of Fas and phosphorylated JNK was observed after Cr(VI) treatment. Cell cycle analysis revealed that the fraction of G2/M phase tended to increase after 24 h of treatment, suggesting that Cr(VI)-induced apoptosis is related to the G2 block. These results indicate that Ca(2+)-calpain- and mitochondria-caspase-dependent pathways play significant roles in the Cr(VI)-induced apoptosis via the G2 block, which are independent of JNK and Fas activation. The inhibition of apoptosis and all its signal transductions by NAC suggests that intracellular reactive oxygen species (ROS) are important for both pathways in Cr(VI)-induced apoptosis of U937 cell.
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Affiliation(s)
- Yoko Hayashi
- Department of Radiological Sciences, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Toyama 930-0194, Japan
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103
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Matsura T, Kai M, Jiang J, Babu H, Kini V, Kusumoto C, Yamada K, Kagan VE. Endogenously generated hydrogen peroxide is required for execution of melphalan-induced apoptosis as well as oxidation and externalization of phosphatidylserine. Chem Res Toxicol 2004; 17:685-96. [PMID: 15144226 DOI: 10.1021/tx030050s] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrogen peroxide (H(2)O(2)) is generated endogenously during execution of both intrinsic as well as extrinsic apoptotic programs suggesting that it may function as a secondary messenger in apoptotic pathways. In the present study, we investigated the role of endogenously generated H(2)O(2) by using two cell lines-HL-60 cells and its subclone, H(2)O(2) resistant HP100 cells overexpressing catalase (CAT). With the exception of CAT, we found no differences in the expression of other primary antioxidant enzymes (Cu/Zn-superoxide dismutase, Mn-superoxide dismutase, and glutathione peroxidase) or apoptosis-related proteins (Bcl-2 and Bax) in HP100 cells as compared with the parental HL-60 cells. Production of H(2)O(2) was readily detectable as early as 1 h after melphalan (Mel) exposure of HL-60 cells but not HP-100 cells. Biomarkers of apoptosis, such as release of cytochrome c, disruption of mitochondrial transmembrane potential, caspase-3 activation, and chromatin condensation, became apparent much later, 3 h and onward after Mel treatment of HL-60 cells. The emergence of essentially all biomarkers of apoptosis was dramatically delayed in HP100 cells as compared with HL-60 cells. A relatively minor phospholipid species, phosphatidylserine (PS), was markedly oxidized 3 h after Mel treatment in HL-60 cells (but not in HP100 cells) where it was significantly inhibited by exogenously added CAT. The two most abundant classes of membrane phospholipids, phosphatidylcholine and phosphatidyletanolamine, did not undergo any significant oxidation. PS oxidation took place 3 h after exposure of HL-60 cells to Mel and paralleled the appearance of cytochrome c in the cytosol. Neither cytochrome c release nor PS oxidation occurred in Mel-treated HP100 cells, indicating that both endogenous H(2)O(2) and cytochrome c were essential for selective PS oxidation detected in HL-60 cells. Mel-induced PS oxidation was also associated with externalization of PS on the surface of HL-60 cells. Given that 3-amino-1,2,4-triazole, a CAT inhibitor, suppressed the resistance of HP100 cells to apoptosis, production of reactive oxygen species, PS oxidation, and PS externalization induced by Mel, the results from the present study suggest that H(2)O(2) is critical for triggering the Mel-induced apoptotic program as well as PS oxidation and externalization.
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Affiliation(s)
- Tatsuya Matsura
- Division of Medical Biochemistry, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, 86 Nishi-cho, Yonago 683-8503, Japan.
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104
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Bernard D, Gosselin K, Monte D, Vercamer C, Bouali F, Pourtier A, Vandenbunder B, Abbadie C. Involvement of Rel/nuclear factor-kappaB transcription factors in keratinocyte senescence. Cancer Res 2004; 64:472-81. [PMID: 14744759 DOI: 10.1158/0008-5472.can-03-0005] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
After a finite doubling number, normal cells become senescent, i.e., nonproliferating and apoptosis resistant. Because Rel/nuclear factor (NF)-kappaB transcription factors regulate both proliferation and apoptosis, we have investigated their involvement in senescence. cRel overexpression in young normal keratinocytes results in premature senescence, as defined by proliferation blockage, apoptosis resistance, enlargement, and appearance of senescence-associated beta-galactosidase (SA-beta-Gal) activity. Normal senescent keratinocytes display a greater endogenous Rel/NF-kappaB DNA binding activity than young cells; inhibiting this activity in presenescent cells decreases the number of cells expressing the SA-beta-Gal marker. Normal senescent keratinocytes and cRel-induced premature senescent keratinocytes overexpressed manganese superoxide dismutase (MnSOD), a redox enzyme encoded by a Rel/NF-kappaB target gene. MnSOD transforms the toxic O()(2) into H(2)O(2), whereas catalase and glutathione peroxidase convert H(2)O(2) into H(2)O. Neither catalase nor glutathione peroxidase is up-regulated during cRel-induced premature senescence or during normal senescence, suggesting that H(2)O(2) accumulates. Quenching H(2)O(2) by catalase delays the occurrence of both normal and premature cRel-induced senescence. Conversely, adding a nontoxic dose of H(2)O(2) to the culture medium of young normal keratinocytes induces a premature senescence-like state. All these results indicate that Rel/NF-kappaB factors could take part in the occurrence of senescence by generating an oxidative stress via the induction of MnSOD.
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Affiliation(s)
- David Bernard
- UMR 8117 CNRS-Institut Pasteur de Lille-Université Lille 1, Institut de Biologie de Lille, Lille Cedex, France
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105
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Liu CY, Chuang PI, Chou CL, Lin SM, Chen HC, Chou P, Liu YH, Yu CT, Wang CH, Lin HC, Kuo HP. Cytoprotective response of A1, a Bcl-2 homologue expressed in mature human neutrophils and promyelocytic HL-60 cells, to oxidant stress-induced cell death. J Biomed Sci 2004; 11:214-27. [PMID: 14966372 DOI: 10.1007/bf02256565] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2003] [Accepted: 10/16/2003] [Indexed: 12/20/2022] Open
Abstract
The ability to generate reactive oxidative intermediates is one of the quintessential properties of mature human neutrophils. Endogenously generated oxidants have been shown to be an important mechanism underlying neutrophil cell death. In acute lung inflammation, newly recruited neutrophils further encounter external oxidants, including reactive oxygen and nitrogen intermediates. In our present study, we showed that A1, a constitutive and inducible Bcl-2 homologue expressed in mature circulating human neutrophils, might confer the protection from hydrogen peroxide (H(2)O(2))- and peroxynitrite (ONOO)-induced cell death. Utilizing the myeloid precursor cell line, HL-60, we further examined the hypothesis that A1 was capable of conferring cytoprotective activity against these oxidative stresses. Whereas the control-transfected HL-60 cells expressed small amounts of A1 and were sensitive to the biologically relevant, cell death-inducing oxidants, H(2)O(2) and ONOO, the stable transfectants that overexpressed A1 were significantly more tolerant. Furthermore, there was a correlation between the level of A1 expression and the antiapoptotic activity. Thus, our results suggest a cytoprotective role of A1 in mature human neutrophils under oxidant stresses in host defense and inflammation.
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Affiliation(s)
- Chien-Ying Liu
- Department of Thoracic Medicine II, Chang-Gung Memorial Hospital, Taipei, Taiwan.
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106
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Affiliation(s)
- D James Morré
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, Lafayette, Indiana 47907, USA
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107
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England K, O'Driscoll C, Cotter TG. Carbonylation of glycolytic proteins is a key response to drug-induced oxidative stress and apoptosis. Cell Death Differ 2003; 11:252-60. [PMID: 14631408 DOI: 10.1038/sj.cdd.4401338] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Recent work has highlighted the importance of protein post-translational modifications such as phosphorylation (enzymatic) and nitrosylation (nonenzymatic) in the early stages of apoptosis. In this study, we have investigated the levels of protein carbonylation, a nonenzymatic protein modification that occurs in conditions of cellular oxidative stress, during etopside-induced apoptosis of HL60 cells. Within 1 h of VP16 treatment, a number of proteins underwent carbonylation due to oxidative stress. This was inhibited by the antioxidant N-acetyl-L-cysteine. Among the proteins found to be carbonylated were glycolytic enzymes. Subsequently, we found that the rate of glycolysis was significantly reduced, probably due to a carbonylation mediated reduction in enzymatic activity of glycolytic enzymes. Our work demonstrates that protein carbonylation can be rapidly induced through cytotoxic drug treatment and may specifically inhibit the glycolytic pathway. Given the importance of glycolysis as a source of cellular ATP, this has severe implications for cell function.
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Affiliation(s)
- K England
- Tumour Biology Laboratory, Biosciences Institute, Department of Biochemistry, University College Cork, Cork, Republic of Ireland
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108
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Tyurina YY, Serinkan FB, Tyurin VA, Kini V, Yalowich JC, Schroit AJ, Fadeel B, Kagan VE. Lipid antioxidant, etoposide, inhibits phosphatidylserine externalization and macrophage clearance of apoptotic cells by preventing phosphatidylserine oxidation. J Biol Chem 2003; 279:6056-64. [PMID: 14630936 DOI: 10.1074/jbc.m309929200] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Apoptosis is associated with the externalization of phosphatidylserine (PS) in the plasma membrane and subsequent recognition of PS by specific macrophage receptors. Selective oxidation of PS precedes its externalization/recognition and is essential for the PS-dependent engulfment of apoptotic cells. Because etoposide is a potent and selective lipid antioxidant that does not block thiol oxidation, we hypothesized that it may affect PS externalization/recognition without affecting other features of the apoptotic program. We demonstrate herein that etoposide induced apoptosis in HL-60 cells without the concomitant peroxidation of PS and other phospholipids. HL-60 cells also failed to externalize PS in response to etoposide treatment. In contrast, oxidant (H2O2)-induced apoptosis was accompanied by PS externalization and oxidation of different phospholipids, including PS. Etoposide potentiated H2O2-induced apoptosis but completely blocked H2O2-induced PS oxidation. Etoposide also inhibited PS externalization as well as phagocytosis of apoptotic cells by J774A.1 macrophages. Integration of exogenous PS or a mixture of PS with oxidized PS in etoposide-treated HL-60 cells reconstituted the recognition of these cells by macrophages. The current data demonstrate that lipid antioxidants, capable of preventing PS peroxidation, can block PS externalization and phagocytosis of apoptotic cells by macrophages and hence dissociate PS-dependent signaling from the final common pathway for apoptosis.
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Affiliation(s)
- Yulia Y Tyurina
- Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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109
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Tétaud C, Falguières T, Carlier K, Lécluse Y, Garibal J, Coulaud D, Busson P, Steffensen R, Clausen H, Johannes L, Wiels J. Two distinct Gb3/CD77 signaling pathways leading to apoptosis are triggered by anti-Gb3/CD77 mAb and verotoxin-1. J Biol Chem 2003; 278:45200-8. [PMID: 12944404 DOI: 10.1074/jbc.m303868200] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Globotriasosylceramide (Gb3), a neutral glycosphingolipid, is the B-cell differentiation antigen CD77 and acts as the receptor for most Shiga toxins, including verotoxin-1 (VT-1). We have shown that both anti-Gb3/CD77 mAb and VT-1 induce apoptosis in Burkitt's lymphoma cells. We compared the apoptotic pathways induced by these two molecules by selecting cell lines sensitive to only one of these inducers or to both. In all these cell lines (including the apoptosis-resistant line), VT-1 was transported to the endoplasmic reticulum and inhibited protein synthesis similarly, suggesting that VT-1-induced apoptosis is dissociated from these processes. VT-1 triggered a caspase- and mitochondria-dependent pathway (rapid activation of caspases 8 and 3 associated with a loss of mitochondrial membrane potential (Deltapsim) and the release of cytochrome c from mitochondria). In contrast, the anti-Gb3/CD77 mAb-induced pathway was caspase-independent and only involved partial depolarization of mitochondria. Antioxidant compounds had only marginal effects on VT-1-induced apoptosis but strongly protected cells from anti-Gb3/CD77 mAb-induced apoptosis. VT-1- and anti-Gb3/CD77 mAb-treated cells displayed very different features on electron microscopy. These results clearly indicate that the binding of different ligands to Gb3/CD77 triggers completely different apoptotic pathways.
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Affiliation(s)
- Cecile Tétaud
- Laboratoire Interactions Moléculaires et Cancer, CNRS UMR 8126, Institut Gustave Roussy, 94805 Villejuif cedex, France
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110
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Park YD, Kang WH, Yang WS, Shin KS, Sook Bae K, Park HM. LAMMER kinase homolog, Lkh1, is involved in oxidative-stress response of fission yeast. Biochem Biophys Res Commun 2003; 311:1078-83. [PMID: 14623292 DOI: 10.1016/j.bbrc.2003.10.110] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previously, we reported that the LAMMER kinase homolog, Lkh1, is a negative regulator of filamentous growth and asexual flocculation in the fission yeast, Schizosaccharomyces pombe. Here, we report that the lkh1(+) null mutant is sensitive to oxidative stress because of a reduction in the expression of genes for antioxidant enzymes such as catalase (ctt1(+)) and Cu,Zn-superoxide dismutase (sod1(+)). Furthermore, the lkh1(+) null mutant shows increased levels of intracellular peroxides under conditions of oxidative stress compared with wild-type cells. Interestingly, expression of the gene for the transcription factor Atf1 is reduced in the lkh1(+) null mutant under oxidative stress, whereas expression of the transcription factor Pap1 is not. We report the novel finding that Lkh1 is involved in the oxidative-stress response of the fission yeast, S. pombe, and regulates the expression of antioxidant enzymes via the transcription factor Atf1.
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Affiliation(s)
- Yoon-Dong Park
- Department of Microbiology, Chungnam National University, 305-764, Daejeon, Republic of Korea
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111
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Kim GY, Park SK, Lee MK, Lee SH, Oh YH, Kwak JY, Yoon S, Lee JD, Park YM. Proteoglycan isolated from Phellinus linteus activates murine B lymphocytes via protein kinase C and protein tyrosine kinase. Int Immunopharmacol 2003; 3:1281-92. [PMID: 12890426 DOI: 10.1016/s1567-5769(03)00115-2] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Medicinal mushrooms are increasingly used to treat a wide variety of disease processes. Aqueous extract from the fruiting body or mycelia of Phellinus linteus has been reported to produce antitumor and immunomodulatory activities in vivo and in vitro. However, the therapeutic mechanism has not been known. In the present study, we investigated whether proteoglycan (PL) isolated from P. linteus has an effect on the immunomodulatory activities of the murine splenic lymphocytes (MSLs). Treatment with PL caused a four-fold augmentation in [3H]thymidine incorporation compared to untreated control group in MSLs. Flow cytometric analysis indicated that the affected cell population was mainly CD19(+) cells, but not CD3(+) cells. These data suggested that the main target of PL was the B cells, but not T cells. PL also enhanced the expression of co-stimulatory molecules, CD80 and CD86, in murine B cells in a time-dependent manner. Accordingly, we investigated if intracellular [Ca(2+)] and reactive oxygen intermediates (ROI) were the principal downstream components that contributed to PL-induced activation, with respect to both increases of proliferation and induction of co-stimulatory molecules. However, PL has no influence on the [Ca(2+)] concentration and the ROI formation in murine B cells, whereas the genistein, protein tyrosine kinase (PTK) inhibitor or staurosporine, protein kinase C (PKC), blocked the proliferation and the induction of co-stimulatory molecules, CD80 and CD86, in B cells stimulated with PL. Taken together, these data suggest that PL is a biological response modifier that stimulates proliferation and expression of co-stimulatory molecules in B cells, probably by regulating PTK and PKC signaling pathways.
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Affiliation(s)
- Gi-Young Kim
- Department of Microbiology, College of Natural Sciences, Pusan National University, Pusan 609-735, South Korea
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112
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Richert L, Lamboley C, Viollon-Abadie C, Grass P, Hartmann N, Laurent S, Heyd B, Mantion G, Chibout SD, Staedtler F. Effects of clofibric acid on mRNA expression profiles in primary cultures of rat, mouse and human hepatocytes. Toxicol Appl Pharmacol 2003; 191:130-46. [PMID: 12946649 DOI: 10.1016/s0041-008x(03)00231-x] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The mRNA expression profile in control and clofibric acid (CLO)-treated mouse, rat, and human hepatocytes was analyzed using species-specific oligonucleotide DNA microarrays (Affymetrix). A statistical empirical Bayes procedure was applied in order to select the significantly differentially expressed genes. Treatment with the peroxisome proliferator CLO induced up-regulation of genes involved in peroxisome proliferation and in cell proliferation as well as down-regulation of genes involved in apoptosis in hepatocytes of rodent but not of human origin. CLO treatment induced up-regulation of microsomal cytochrome P450 4a genes in rodent hepatocytes and in two of six human hepatocyte cultures. In addition, genes encoding phenobarbital-inducible cytochrome P450s were also up-regulated by CLO in rodent and human hepatocyte cultures. Up-regulation of phenobarbital-inducible UDP-glucuronosyl-transferase genes by CLO was observed in both rat and human but not in mouse hepatocytes. CLO treatment induced up-regulation of L-fatty acid binding protein (L-FABP) gene in hepatocytes of both rodent and human origin. However, while genes of the cytosolic, microsomal, and mitochondrial pathways involved in fatty acid transport and metabolism were up-regulated by CLO in both rodent and human hepatocyte cultures, genes of the peroxisomal pathway of lipid metabolism were up-regulated in rodents only. An up-regulation of hepatocyte nuclear factor 1alpha (HNF1alpha) by CLO was observed only in human hepatocyte cultures, suggesting that this trans-activating factor may play a key role in the regulation of fatty acid metabolism in human liver as well as in the nonresponsiveness of human liver to CLO-induced regulation of cell proliferation and apoptosis.
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Affiliation(s)
- Lysiane Richert
- Laboratoire de Biologie Cellulaire, UFR SMP, 4, place Saint-Jacques, 25030 Besançon, France.
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113
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Jing XB, Li T, Yang QH, Guo GH, Hu H, Chen SZ. Inhibitory mechanism on proliferation of hepatocellular carcinoma cell line by tetrandrine. Shijie Huaren Xiaohua Zazhi 2003; 11:1223-1226. [DOI: 10.11569/wcjd.v11.i8.1223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM To study the mechanism of tetrandrine (TTD) on proliferation and apoptosis of hepatic cell carcinoma (HCC) cell line.
METHODS MTT colorimetry was used to evaluate the influence of TTD on proliferation of cells. Flow cytometry was used to test reactive oxygen species (ROS) levels in cells. Electrophoresis in 1.5% agarose gels was used to assess the DNA laddering.
RESULTS Proliferation rate of HCC cell line stimulated by 10 and 20 μmol/L TTD at 24 h, 48 h, and 72 h was 90.1±1.0%, 77.5±2.0%, 70.2±2.9% and 56.6±1.6%, 61.6±2.0% and 47.2±1.9%, respectively (F = 40.025, P<0.001). O2- and H2O2. generated by HCC cell lines incubated with 0, 10 and 20 μmol/L TTD for 2 hours were 35 and 24.5%, 36.6 and 40.5%, 63.2 and 84.6%, respectively. Typical DNA ladder was observed after the cell line was incubated in 20 μmol/L TTD for 48 hours.
CONCLUSION TTD can induce the apoptosis of ROS of hepatic cell carcinoma cell line by generation of ROS in a dose dependent manner.
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Affiliation(s)
- Xu-Bin Jing
- Department of Gastroenterology, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong Province, China
| | - Tao Li
- Department of Gastroenterology, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong Province, China
| | - Qi-Hua Yang
- Department of Gastroenterology, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong Province, China
| | - Guang-Hua Guo
- Department of Gastroenterology, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong Province, China
| | - Hui Hu
- Department of Gastroenterology, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong Province, China
| | - Su-Zhuan Chen
- Department of Gastroenterology, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong Province, China
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114
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Martin H, Richert L, Berthelot A. Magnesium deficiency induces apoptosis in primary cultures of rat hepatocytes. J Nutr 2003; 133:2505-11. [PMID: 12888628 DOI: 10.1093/jn/133.8.2505] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The effects of extracellular magnesium (Mg) concentration on the rate of apoptosis in rat hepatocytes in primary culture were examined. After overnight attachment, incubations were conducted for up to 72 h in serum-free media containing low (0-0.4 mmol/L), physiological (0.8 mmol/L) or high (2 and 5.6 mmol/L) Mg concentrations. At 72 h, we observed numerous rounded hepatocytes on top of a shrunken cell monolayer at extracellular Mg concentrations < 0.8 mmol/L. These morphological features were associated with Mg-dependent differences in the total protein levels. The various Mg concentrations did not affect DNA synthesis; however, at a concentration < 0.8 mmol/L, the susceptibility of cultured rat hepatocytes to oxidative stress was increased as shown by the reduced glutathione concentration (10.6 +/- 2.8 vs. 37.3 +/- 4.1 nmol/mg protein with 0 and 0.8 mmol/L, respectively; P < 0.05) and increased lipid peroxidation (0.36 +/- 0.03 vs. 0.21 +/- 0.01 nmol malondialdehyde/mg protein with 0 and 0.8 mmol/L, respectively; P < 0.05). Fluorescence microscopy after Hoechst dye staining revealed numerous apoptotic figures in Mg-free monolayers compared with 0.8 and 5.6 mmol/L Mg conditions. These observations were confirmed quantitatively by flow-cytometric analysis after propidium iodide staining. The proportion of subdiploid cells decreased with increasing Mg concentration; for example, it was greater at 72 h in Mg-free cultures (76%) than in cultures containing 0.8 mmol/L or 5.6 mmol/L Mg (28%; P < 0.05). Caspase-3 was highly activated in Mg-free cultures after 48 h of treatment compared with 0.8 and 5.6 mmol/L conditions (P < 0.05). Overall, these results show that extracellular Mg deficiency has a negative effect on the survival of cultured rat hepatocytes by inducing apoptosis; however, supplementation of extracellular Mg did not reduce the spontaneous apoptosis that occurred over time in rat hepatocyte cultures.
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Affiliation(s)
- Hélène Martin
- Laboratoire de Physiologie, UFR des Sciences Médicales et Pharmaceutiques, Besançon, France
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115
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Crowley-Weber CL, Dvorakova K, Crowley C, Bernstein H, Bernstein C, Garewal H, Payne CM. Nicotine increases oxidative stress, activates NF-kappaB and GRP78, induces apoptosis and sensitizes cells to genotoxic/xenobiotic stresses by a multiple stress inducer, deoxycholate: relevance to colon carcinogenesis. Chem Biol Interact 2003; 145:53-66. [PMID: 12606154 DOI: 10.1016/s0009-2797(02)00162-x] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Epidemiologic studies indicate that environmental (smoking) and dietary factors (high fat) contribute to carcinogenesis in many organ systems. The aim of our study was to test the hypothesis that nicotine, a component of cigarette smoke, and sodium deoxycholate (NaDOC), a cytotoxic bile salt that increases in concentration in the gastrointestinal tract after a high fat meal, induce similar cellular stresses and that nicotine may enhance some of the NaDOC-induced stresses. We found that nicotine, at 0.8 microM, the very low sub-micromolar level occurring in the tissues of smokers: (1). increases oxidative stress; (2). activates NF-kappaB, a redox-sensitive transcription factor; (3). activates the 78 kD glucose regulated protein promoter, an indication of endoplasmic reticulum stress; (4). induces apoptosis; (5). enhances the ability of NaDOC to activate the 153 kD growth arrest and DNA damage promoter, an indication of increased genotoxic stress; and (6). enhances the ability of NaDOC to activate the xenobiotic response element. Our findings have applicability to G.I. cancer, in general, since smoking is a risk factor in the development of esophageal, pancreatic, gastric and colon cancer, and these cancers are also promoted by bile acids.
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Affiliation(s)
- Cara L Crowley-Weber
- Department of Microbiology and Immunology, College of Medicine, University of Arizona, Tucson, AZ 85724, USA
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116
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Sancho P, Troyano A, Fernández C, De Blas E, Aller P. Differential effects of catalase on apoptosis induction in human promonocytic cells. Relationships with heat-shock protein expression. Mol Pharmacol 2003; 63:581-9. [PMID: 12606765 DOI: 10.1124/mol.63.3.581] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The administration of the H(2)O(2)-specific scavenger catalase attenuated the generation of apoptosis by the antitumor drugs etoposide, camptothecin, doxorubicin, and cisplatin in U-937 human promonocytic cells. By contrast, the antioxidant potentiated the generation of apoptosis by the inducers of the stress response, heat shock and cadmium, in this and other myeloid cell types. Catalase also increased the heat shock-provoked stimulation of caspase-3 and -9 activities, as well as the release of cytochrome c from mitochondria to the cytosol. The potentiation of cell death by catalase correlated with its capacity to inhibit the stress response, as demonstrated by the suppression of 70- or 27-kDa heat-shock protein expression and the inhibition of heat-shock transcription factor 1 binding activity. Conversely, the toxicity of catalase plus heat shock was attenuated when the cells were preconditioned with a soft heating, which elevated the 70-kDa heat-shock protein levels. By contrast with catalase, the antioxidants superoxide dismutase and probucol did not inhibit heat-shock protein expression or affect apoptosis in U-937 cells. Finally, it was observed that the antitumor drugs did not activate the stress response in U-937 cells and that catalase failed to inhibit HSP expression and to potentiate apoptosis in heat shock-treated RPMI 8866 lymphoblastic cells. Taken together, these results provide the first demonstration of a proapoptotic action of catalase, suggest that H(2)O(2) is a critical regulator of both apoptosis and the stress response, and corroborate the antiapoptotic action of heat-shock proteins in myeloid cells.
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Affiliation(s)
- Patricia Sancho
- Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
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117
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Salmelin C, Vilpo J. Induction of SOS response, cellular efflux and oxidative stress response genes by chlorambucil in DNA repair-deficient Escherichia coli cells (ada, ogt and mutS). Mutat Res 2003; 522:33-44. [PMID: 12517410 DOI: 10.1016/s0027-5107(02)00231-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Chlorambucil (CLB) is a bifunctional alkylating drug widely used as an anticancer agent and as an immunosuppressant. It is known to be mutagenic, teratogenic and carcinogenic. The cellular actions of CLB have remained poorly investigated. It is very likely that DNA damage and its repair are the key elements determining the destiny of CLB-exposed cells. We investigated the role of two specific DNA repair pathways involved in CLB-induced mutagenicity and gene expression changes by using Escherichia coli strains lacking either (i) two DNA methyltransferase functions (O(6)-methylguanine-DNA methyltransferase I (ada) and II (ogt)), or (ii) mismatch repair (MutS (mutS)). Mutagenicity was determined as the development of ciproxin and rifampicin resistance and the gene expression changes were assessed using expression profiling of all E. coli 4290 open reading frames (ORFs) by cDNA array. Chlorambucil-induced mutants in mutS cells, implying the importance of mismatch repair in preventing CLB-induced mutations. It also induced mutants in the ada, ogt strain, but to a lesser extent than in the wild-type strain. The simultaneous upregulation of several genes of the SOS response, cellular efflux and oxidative stress response, was demonstrated in both of the DNA repair-deficient strains but not in the wild-type cells. These and our previous results show that single-gene knock-out cells use specific gene regulation strategies to avoid mutations and cell death induced by agents such as chlorambucil.
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Affiliation(s)
- Camilla Salmelin
- Department of Clinical Chemistry, Tampere University Hospital and Tampere University Medical School, PO Box 2000, FIN-33521 Tampere, Finland.
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118
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Morré DM, Morré DJ. Specificity of coenzyme Q inhibition of an aging-related cell surface NADH oxidase (ECTO-NOX) that generates superoxide. Biofactors 2003; 18:33-43. [PMID: 14695918 DOI: 10.1002/biof.5520180205] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Our laboratories have described a novel class of ectoproteins at the cell surface with both NADH or hydroquinone oxidase (NOX) and protein disulfide-thiol interchange activities (ECTO-NOX proteins). The two activities exhibited by these proteins alternate to generate characteristic patterns of oscillations where the period length is independent of temperature. The period length for the constitutive ECTO-NOX is 24 min. Here we describe a distinctive age-related ECTO-NOX (arNOX) whose activity is blocked by coenzyme Q10. arNOX occurs exclusively in aged cells and tissues. The period length of the oscillations is 26 min. Rather than reducing 1/2 O2 to H2O, electrons are transferred to O2 to form superoxide. Superoxide formation was demonstrated by superoxide dismutase-sensitive reduction of ferricytochrome c and by reduction of a superoxide-specific tetrazolium salt. Quinone inhibition was given by coenzymes Q8, 9 and Q10 but not by Q0, Q2, Q4, Q6 or 7. The arNOX provides a mechanism to propagate reactive oxygen species generated at the cell surface to surrounding cells and circulating lipoproteins of importance to atherogenesis. Inhibition of arNOX by dietary coenzyme Q10 provides a rational basis for dietary coenzyme 10 use to retard aging-related arterial lesions.
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Affiliation(s)
- Dorothy M Morré
- Department of Foods and Nutrition, Purdue University, West Lafayette, IN 47907, USA.
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119
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Fujita T, Maruyama M, Araya J, Sassa K, Kawagishi Y, Hayashi R, Matsui S, Kashii T, Yamashita N, Sugiyama E, Kobayashi M. Hydrogen peroxide induces upregulation of Fas in human airway epithelial cells via the activation of PARP-p53 pathway. Am J Respir Cell Mol Biol 2002; 27:542-52. [PMID: 12397013 DOI: 10.1165/rcmb.4775] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Fas mediates apoptosis following binding with Fas ligand. Fas is expressed in human airway epithelial cells and has a critical role in the pathophysiology of various pulmonary disorders. Hydrogen peroxide (H(2)O(2)) is an important mediator of airway epithelial injury. In this context, we hypothesized that H(2)O(2) would increase the expression of cell surface Fas in human airway epithelial cells. To test this hypothesis, the modulation of Fas expression with H(2)O(2) was assessed in normal human bronchial epithelial cells and A549 cells. The majority of Fas was cytoplasmic in both cell types without any stimulation. Hydrogen peroxide significantly increased Fas in the plasma membrane fraction, while decreasing Fas in the cytoplasmic fraction. Incubation with an agonistic antibody for Fas induced apoptosis in H(2)O(2)-treated cells in proportion to the level of surface Fas expression on those cells. Inhibitors of poly(ADP-ribose) polymerase abrogated the H(2)O(2)-induced Fas translocation to the plasma membrane and p53 activation. Expression of dominant-negative p53 also inhibited the Fas translocation induced by H(2)O(2) in A549 cells. These results indicate that H(2)O(2) induces Fas upregulation by promoting cytoplasmic transport of Fas to the cell surface in human airway epithelial cells, and that the activation of the poly(ADP-ribose) polymerase-p53 pathway may be involved in this mechanism.
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Affiliation(s)
- Tadashi Fujita
- The First Department of Internal Medicine, Faculty of Medicine, Toyama Medical and Pharmaceutical University, Japan
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120
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Moran EC, Kamiguti AS, Cawley JC, Pettitt AR. Cytoprotective antioxidant activity of serum albumin and autocrine catalase in chronic lymphocytic leukaemia. Br J Haematol 2002. [DOI: 10.1046/j.1365-2141.2002.03280.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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121
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Jing X, Ueki N, Cheng J, Imanishi H, Hada T. Induction of apoptosis in hepatocellular carcinoma cell lines by emodin. Jpn J Cancer Res 2002; 93:874-82. [PMID: 12716464 PMCID: PMC5927105 DOI: 10.1111/j.1349-7006.2002.tb01332.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Previous experiments have shown that emodin is highly active in suppressing the proliferation of several tumor cell lines. However, it is not clear that emodin can induce growth inhibition of hepatoma cells. We have found that emodin induces apoptotic responses in the human hepatocellular carcinoma cell lines (HCC) Mahlavu, PLC/PRF/5 and HepG2. The addition of emodin to these three cell lines led to inhibition of growth in a time- and dose-dependent manner. Emodin generated reactive oxygen species (ROS) in these cells which brought about a reduction of the intracellular mitochondrial transmembrane potential (DeltaPsim), followed by the activation of caspase-9 and caspase-3, leading to DNA fragmentation and apoptosis. Our findings demonstrate that ROS and the resulting oxidative stress play a pivotal role in apoptosis. Preincubation of hepatoma cell lines with the hydrogen peroxide-scavenging enzyme, catalase (CAT) and cyclosporin A (CsA), partially inhibited apoptosis. These results demonstrate that enhancement of generation of ROS, DeltaPsim disruption and caspase activation may be involved in the apoptotic pathway induced by emodin.
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Affiliation(s)
- Xubin Jing
- Division of Hepatobiliary and Pancreatic Disease, Department of Internal Medicine, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan
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122
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Abstract
Cells are constantly generating reactive oxygen species (ROS) during aerobic metabolism. As a consequence, each cell is equipped with an extensive antioxidant defence system to combat excessive production of ROS. Oxidative stress occurs in cells when the generation of ROS overwhelms the cell's natural antioxidant defences. There is a growing consensus that oxidative stress and the redox state of a cell plays a pivotal role in regulating apoptosis, a tightly controlled form of cell death in which a cell partakes in its own demise. More recently, a role for reactive nitrogen species (RNI) as both positive and negative regulators of cell death has been established. This review describes the major sources of ROS and RNI in a cell, the control of cell death by these species and the role of antioxidants as regulators of oxidative stress and apoptosis. Finally, the various methods that can be employed in establishing a role for both ROS and RNI in apoptosis will be discussed with particular emphasis on their intracellular detection.
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Affiliation(s)
- James F Curtin
- Tumour Biology Laboratory, Department of Biochemistry, Lee Maltings, University College Cork, Ireland
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123
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Bernard D, Monte D, Vandenbunder B, Abbadie C. The c-Rel transcription factor can both induce and inhibit apoptosis in the same cells via the upregulation of MnSOD. Oncogene 2002; 21:4392-402. [PMID: 12080470 DOI: 10.1038/sj.onc.1205536] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2001] [Revised: 03/11/2002] [Accepted: 03/27/2002] [Indexed: 12/24/2022]
Abstract
Rel/NF-kappaB transcription factors are involved in several physiological processes, including the regulation of apoptosis. These factors were shown to exhibit pro- or anti-apoptotic activities in different cellular models, but at present, the mechanisms underlying these opposite effects are poorly understood. In this study, we show that the constitutive expression of a transcriptionally active member of the Rel/NF-kappaB family, c-Rel, first induces a resistance against TNFalpha-induced apoptosis and later increases the level of spontaneous apoptosis of HeLa cells. Both the anti- and pro-apoptotic effects increase with the level of c-Rel overexpression. The up-regulation by c-Rel of the manganese superoxide dismutase (MnSOD) could explain both the rapid anti-apoptotic effect and the delayed pro-apoptotic one. Indeed, the enzymatic activity of MnSOD is to transform the toxic O(2)(*)(-) in H(2)O(2). Hence, on one hand, its induction helps cells to resist against the apoptogenic burst of O(2)(*)(-) produced upon TNFalpha stimulation, but on the other hand, it leads to a progressive H(2)O(2) accumulation that ultimately results in apoptosis. These results indicate that the anti- and pro-apoptotic effects of Rel/NF-kappaB factors are not necessarily alternative but can occur successively in the same cell, via the up-regulation of the same target gene.
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Affiliation(s)
- David Bernard
- FRE 2353 CNRS/Institut Pasteur de Lille/Université Lille 2, Institut de Biologie de Lille, 1 rue Calmette, 59021 Lille Cedex, France
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124
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Arai Y, Kondo T, Tanabe K, Zhao QL, Li FJ, Ogawa R, Li M, Kasuya M. Enhancement of hyperthermia-induced apoptosis by local anesthetics on human histiocytic lymphoma U937 cells. J Biol Chem 2002; 277:18986-93. [PMID: 11861640 DOI: 10.1074/jbc.m108084200] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The combined effects of hyperthermia at 44 degrees C and local anesthetics on apoptosis in human histiocytic lymphoma U937 cells were investigated. When the cells were exposed to hyperthermia for l0 min marginal DNA fragmentation and nuclear fragmentation were observed. In the presence of amide-type local anesthetics further enhancement was found depending on concentration. The order of the concentration required for maximum induction was the reverse order of the lipophilicity (prilocaine > lidocaine > bupivacaine). Western blotting revealed that in hyperthermia there was initial release of Ca(2+) from the intracellular store site as indicated by increased expression of the type 1 inositol-1,4,5-trisphosphate receptor. However, the combination with lidocaine did not induce any further enhancement. Lidocaine enhanced the decrease in ATP content and the increase in intracellular Ca(2+) concentration in individual cells induced by hyperthermia. In addition, superoxide formation, decrease in the mitochondrial membrane potential, and activation of intracellular caspase-3 were found in the cells treated with hyperthermia and lidocaine. All of these were suppressed in part in the presence of the intracellular Ca(2+) ion chelator BAPTA-AM (bis-(O-aminophenoxy)-ethane-N,N,N',N'-tetraacetic acid-acetoxymethyl). The present results indicate that local anesthetics at optimal concentrations enhance hyperthermia-induced apoptosis via Ca(2+)- and mitochondria-dependent pathways. Initial release of Ca(2+) from intracellular store sites caused by hyperthermia and followed by the subsequent increase in the intracellular Ca(2+) concentration and the additional activation of the mitochondrial caspase-dependent pathway (partly regulated by intracellular Ca(2+) concentration) plays a crucial role in the enhancement of apoptosis induced by the combination of hyperthermia and lidocaine.
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Affiliation(s)
- Yoko Arai
- Department of Public Health and Radiological Sciences, Faculty of Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan
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125
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Troyano A, Fernández C, Sancho P, de Blas E, Aller P. Effect of glutathione depletion on antitumor drug toxicity (apoptosis and necrosis) in U-937 human promonocytic cells. The role of intracellular oxidation. J Biol Chem 2001; 276:47107-15. [PMID: 11602574 DOI: 10.1074/jbc.m104516200] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Treatment with the DNA topoisomerase inhibitors etoposide, doxorubicin, and camptothecin, and with the alkylating agents cisplatin and melphalan, caused peroxide accumulation and apoptosis in U-937 human promonocytic cells. Preincubation with the reduced glutathione (GSH) synthesis inhibitor l-buthionine-(S,R)-sulfoximine (BSO) always potentiated peroxide accumulation. However, although GSH depletion potentiated the toxicity of cisplatin and melphalan, occasionally switching the mode of death from apoptosis to necrosis, it did not affect the toxicity of the other antitumor drugs. Hypoxia or preincubation with antioxidant agents attenuated death induction, apoptotic and necrotic, by alkylating drugs. The generation of necrosis by cisplatin could not be mimicked by addition of exogenous H(2)O(2) instead of BSO and was not adequately explained by caspase inactivation nor by a selective fall in ATP content. Treatment with cisplatin and melphalan caused a late decrease in mitochondrial transmembrane potential (DeltaPsim), which was much greater during necrosis than during apoptosis. The administration of the antioxidant agents N-acetyl-l-cysteine and butylated hydroxyanisole after pulse treatment with cisplatin or melphalan did not affect apoptosis but attenuated necrosis. Under these conditions, both antioxidants attenuated the necrosis-associated DeltaPsim decrease. These results indicate that oxidation-mediated alterations in mitochondrial function regulate the selection between apoptosis and necrosis in alkylating drug-treated human promonocytic cells.
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Affiliation(s)
- A Troyano
- Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Cientificas, Universidad de Alcalá, Velázquez 144, Madrid 28006, Spain
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126
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Koistinen P, Siitonen T, Mäntymaa P, Savolainen ER. p53 and redox state in etoposide-induced acute myeloblastic leukemia cell death. Leuk Res 2001; 25:1099-105. [PMID: 11684284 DOI: 10.1016/s0145-2126(01)00076-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We investigated whether p53, being a redox-sensitive protein, has a role in the responsiveness of AML cells to etoposide. Two subclones of the OCI/AML-2 cell line, the etoposide-sensitive (ES) and the etoposide-resistant (ER), were used as models. Sensitivity to etoposide was measured by trypan blue and annexin V assays. Etoposide-induced peroxide formation was associated with the induction of cell death. Evident expression of mutated p53 was observed in both subclones in basal growth conditions as analysed by Western blotting and flow cytometry. After etoposide exposure for up to 24 hours, some nuclear accumulation of p53 was observed in the ER subclone, as analysed by Western blotting. The conformation of p53, however, was not changed from mutated toward wild-type during exposure in either of the subclones as analysed by flow cytometry. In conclusion, etoposide-induced change in cellular redox state was associated with apoptosis, but was not a sufficient stimulus for p53 to make its conformation active. Thus, mutated p53 seems to have no role in etoposide-induced apoptosis.
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Affiliation(s)
- P Koistinen
- Department of Internal Medicine, University of Oulu, Kajaanintie 50, FIN-90220 Oulu, Finland.
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127
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Jovasevic VM, Mokyr MB. Melphalan-induced expression of IFN-beta in MOPC-315 tumor-bearing mice and its importance for the up-regulation of TNF-alpha expression. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 167:4895-901. [PMID: 11673494 DOI: 10.4049/jimmunol.167.9.4895] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We have previously shown that administration of a low-dose of melphalan (L-phenylalanine mustard; L-PAM) to mice bearing a large s.c. MOPC-315 tumor leads to up-regulation of TNF-alpha expression, which is first evident at the mRNA level at 24 h after the chemotherapy. In this study, we show accumulation of IFN-beta mRNA in the spleen and tumor nodule of such mice as early as 1 h after the chemotherapy followed by elevated production of IFN-beta protein. IFN-beta protein in turn was found to be important for the L-PAM-induced up-regulation of TNF-alpha expression, as neutralization of IFN-beta inhibited the L-PAM-induced up-regulation of TNF-alpha mRNA expression in MOPC-315 tumor cells. In addition, L-PAM failed to up-regulate TNF-alpha expression in spleen cells from mice in which signaling by IFN-beta is deficient. Studies into the mechanism through which L-PAM leads to rapid accumulation of IFN-beta mRNA revealed that it requires de novo RNA synthesis, indicating that the regulation is at the transcriptional level. However, it did not require de novo protein synthesis, indicating that activation of pre-existing transcription factors is sufficient for IFN-beta gene expression. The L-PAM-induced accumulation of IFN-beta mRNA was mimicked with H(2)O(2) and was prevented with the antioxidant N-acetyl-L-cysteine, indicating that reactive oxygen species are involved in the transcriptional regulation of L-PAM-induced IFN-beta gene expression. Thus, the IFN-beta gene is an early response gene that is activated in response to L-PAM via a pathway that involves reactive oxygen species, and IFN-beta in turn plays an important role in L-PAM-induced TNF-alpha up-regulation.
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Affiliation(s)
- V M Jovasevic
- Department of Biochemistry and Molecular Biology, University of Illinois, Chicago, IL 60612, USA
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128
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Galán A, García-Bermejo L, Troyano A, Vilaboa NE, Fernández C, de Blas E, Aller P. The role of intracellular oxidation in death induction (apoptosis and necrosis) in human promonocytic cells treated with stress inducers (cadmium, heat, X-rays). Eur J Cell Biol 2001; 80:312-20. [PMID: 11370746 DOI: 10.1078/0171-9335-00159] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Treatment of U-937 human promonocytic cells with the stress inducers cadmium chloride (2 h at 200 microM), heat (2 h at 42.5 C) or X-rays (20 Gy), followed by recovery, caused death by apoptosis and stimulated caspase-3 activity. In addition, all stress agents caused intracellular oxidation, as measured by peroxide and/or anion superoxide accumulation. However, while pre-incubation with antioxidants (N-acetyl-L-cysteine or butylated hydroxyanisole) inhibited the induction of apoptosis by cadmium and X-rays, it did not affect the induction by heat-shock. Pre-incubation for 24 h with the GSH-depleting agent L-buthionine-[S,R]-sulfoximine (BSO) switched the mode of death from apoptosis to necrosis in cadmium-treated cells. By contrast, BSO only caused minor modifacions in the rate of apoptosis without affecting the mode of death in heat- and X-rays-treated cells. BSO potentiated peroxide accumulation in cells treated with both cadmium and X-rays. However, while the accumulation of peroxides was stable in the case of cadmium, it was transient in the case of X-rays. Moreover, the administration of antioxidants during the recovery period sufficed to prevent necrosis and restore apoptosis in BSO plus cadmium-treated cells. Cadmium and X-rays caused a decrease in intracellular ATP levels, but the decrease was similar in both apoptotic and necrotic cells. Taken together, these results demonstrate that (i) stress inducers cause intracellular oxidation, but oxidation is not a general requirement for apoptosis; and (ii) the duration of the oxidant state seems to be critical in determining the mode of death.
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Affiliation(s)
- A Galán
- Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
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129
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Meyskens FL, McNulty SE, Buckmeier JA, Tohidian NB, Spillane TJ, Kahlon RS, Gonzalez RI. Aberrant redox regulation in human metastatic melanoma cells compared to normal melanocytes. Free Radic Biol Med 2001; 31:799-808. [PMID: 11557318 DOI: 10.1016/s0891-5849(01)00650-5] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Melanocytes and melanoma cells contain melanin, a complex polymer that modulates redox changes in these cells. Relative intracellular hydrogen peroxide levels measured by dichlorodihydrofluorescein are similar in the two cell types, but the levels of superoxide anion measured by dihydroethidium were markedly increased in melanoma cells. Chelator-induced oxidative stress is efficiently suppressed by melanocytes without substantial recruitment of the transcription factors NF-kappaB and AP-1 as measured by electrophoretic mobility shift assay and quantitated by densitometry or by a change in frequency of apoptosis as determined by annexin V binding. In contrast, NF-kappaB in melanoma cells is strongly recruited by changes in redox status and exhibits a correlative relationship to intracellular hydrogen peroxide (but not superoxide anion). However, the response of the NF-kappaB pathway to intracellular hydrogen peroxide is anomalous, including downregulation of p65 and IkappaBalpha RNA expression (Northern blot). Additionally, recruitment of AP-1 binding in melanoma cells was directly correlated with intracellular levels of superoxide anion (but not hydrogen peroxide). Neither the degree of NF-kappaB nor AP-1 binding in melanoma cells was related to the frequency of apoptosis. The responsiveness of NF-kappaB and AP-1 recruitment to intracellular levels of hydrogen peroxide and superoxide anion without concomitant control of apoptosis provides a general mechanism by which these cells can escape noxious injury (e.g., chemotherapy). The marked enhancement of apoptosis in melanoma cells by chelators indicates, however, that this alteration can be circumvented and offers a unique therapeutic window to explore.
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Affiliation(s)
- F L Meyskens
- Department of Medicine, and Chao Family Comprehensive Cancer Center, University of California, Orange, CA 92868, USA.
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130
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Donepudi M, Raychaudhuri P, Bluestone JA, Mokyr MB. Mechanism of melphalan-induced B7-1 gene expression in P815 tumor cells. THE JOURNAL OF IMMUNOLOGY 2001; 166:6491-9. [PMID: 11359799 DOI: 10.4049/jimmunol.166.11.6491] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We have previously shown that exposure of P815 tumor cells to melphalan (L-phenylalanine mustard; L-PAM) leads to up-regulation of B7-1 surface expression, and this L-PAM-induced up-regulation requires de novo RNA synthesis and is associated with accumulation of B7-1 mRNA. Here we show that the effect of L-PAM on B7-1 surface expression can be mimicked by exposing P815 tumor cells to oxidative stress but not to heat shock. Moreover, the antioxidant N-acetyl-L-cysteine prevented the L-PAM-induced accumulation of B7-1 mRNA in P815 tumor cells, suggesting that reactive oxygen species are involved in the transcriptional regulation of L-PAM-induced B7-1 gene expression. Although AP-1 and NF-kappaB are regarded as redox-sensitive transcription factors and the promoter/enhancer region of the B7-1 gene contains an AP-1 and an NF-kappaB binding site, exposure of P815 tumor cells to L-PAM led to rapid and transient activation only of NF-kappaB, but not AP-1, that bound specifically to a probe containing the respective binding site in the murine or human B7-1 gene. Moreover, exposure of P815 tumor cells to a cell-permeable peptide that selectively inhibits NF-kappaB activation by blocking the activation of the IkappaB-kinase complex was found to inhibit the L-PAM-induced B7-1 mRNA accumulation, indicating that NF-kappaB activation is essential for the L-PAM-induced B7-1 gene expression. Taken together, these results indicate that L-PAM leads to activation of B7-1 gene expression by activating NF-kappaB via a pathway that involves reactive oxygen species.
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MESH Headings
- Acetylcysteine/pharmacology
- Amino Acid Sequence
- Animals
- Antigens, CD/biosynthesis
- Antineoplastic Agents, Alkylating/antagonists & inhibitors
- Antineoplastic Agents, Alkylating/pharmacology
- Antioxidants/pharmacology
- B7-1 Antigen/biosynthesis
- B7-1 Antigen/genetics
- B7-2 Antigen
- Binding, Competitive
- Cell Membrane/immunology
- Cell Membrane/metabolism
- Cell Membrane Permeability
- Cell Nucleus/chemistry
- Enhancer Elements, Genetic/drug effects
- Enhancer Elements, Genetic/immunology
- Gene Expression Regulation, Neoplastic/drug effects
- Gene Expression Regulation, Neoplastic/immunology
- Hot Temperature
- Humans
- Hydrogen Peroxide/pharmacology
- I-kappa B Kinase
- Macromolecular Substances
- Mast-Cell Sarcoma/chemistry
- Mast-Cell Sarcoma/genetics
- Mast-Cell Sarcoma/immunology
- Mast-Cell Sarcoma/metabolism
- Melphalan/antagonists & inhibitors
- Melphalan/pharmacology
- Membrane Glycoproteins/biosynthesis
- Mice
- Mice, Inbred BALB C
- Molecular Sequence Data
- Multigene Family/immunology
- NF-kappa B/antagonists & inhibitors
- NF-kappa B/metabolism
- Oligonucleotide Probes/metabolism
- Peptides/genetics
- Peptides/metabolism
- Peptides/pharmacology
- Promoter Regions, Genetic/immunology
- Protein Binding/drug effects
- Protein Binding/genetics
- Protein Binding/immunology
- Protein Serine-Threonine Kinases/antagonists & inhibitors
- Protein Serine-Threonine Kinases/metabolism
- RNA, Messenger/antagonists & inhibitors
- RNA, Messenger/metabolism
- Transcription Factor AP-1/metabolism
- Tumor Cells, Cultured
- Up-Regulation/drug effects
- Up-Regulation/genetics
- Up-Regulation/immunology
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Affiliation(s)
- M Donepudi
- Department of Biochemistry and Molecular Biology, University of Illinois, Chicago, IL 60612
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131
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Donovan M, Carmody RJ, Cotter TG. Light-induced photoreceptor apoptosis in vivo requires neuronal nitric-oxide synthase and guanylate cyclase activity and is caspase-3-independent. J Biol Chem 2001; 276:23000-8. [PMID: 11278285 DOI: 10.1074/jbc.m005359200] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Apoptosis is the mode of photoreceptor cell death in inherited and induced retinal degeneration. However, the molecular mechanisms of photoreceptor cell death in human cases and animal models of retinal dystrophies remain undefined. Exposure of Balb/c mice to excessive levels of white light results in photoreceptor apoptosis. This study delineates the molecular events occurring during and subsequent to the induction of retinal degeneration by exposure to white light in Balb/c mice. We demonstrate an early increase in intracellular calcium levels during photoreceptor apoptosis, an event that is accompanied by significant superoxide generation and mitochondrial membrane depolarization. Furthermore, we show that inhibition of neuronal nitric-oxide synthase (nNOS) by 7-nitroindazole is sufficient to prevent retinal degeneration implicating a key role for neuronal nitric oxide (NO) in this model. We demonstrate that inhibition of guanylate cyclase, a downstream effector of NO, also prevents photoreceptor apoptosis demonstrating that guanylate cyclase too plays an essential role in this model. Finally, our results demonstrate that caspase-3, frequently considered to be one of the key executioners of apoptosis, is not activated during retinal degeneration. In summary, the data presented here demonstrate that light-induced photoreceptor apoptosis in vivo is mediated by the activation of nNOS and guanylate cyclase and is caspase-3-independent.
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Affiliation(s)
- M Donovan
- Tumour Biology Laboratory, Department of Biochemistry, Lee Maltings, University College Cork, Cork, Ireland
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132
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Affiliation(s)
- D E Godar
- Food and Drug Administration, Center for Devices and Radiological Health, Rockville, Maryland 20852, USA
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133
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Shimura M, Osawa Y, Yuo A, Hatake K, Takaku F, Ishizaka Y. Oxidative stress as a necessary factor in room temperature‐induced apoptosis of HL‐60 cells. J Leukoc Biol 2000. [DOI: 10.1189/jlb.68.1.87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
| | - Yutaka Osawa
- Department of Neurology, Neurological Institute, Tokyo Women’s Medical University, Tokyo, Japan
| | - Akira Yuo
- Department of Hematology, International Medical Center of Japan, Tokyo, Japan
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134
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Abstract
Apoptosis is a genetically programmed, physiological method of cell destruction. A variety of genes are now recognised as positive or negative regulators of this process. Expression of inducible heat shock proteins (hsp) is known to correlate with increased resistance to apoptosis induced by a range of diverse cytotoxic agents and has been implicated in chemotherapeutic resistance of tumours and carcinogenesis. Intensive research on apoptosis over the past number of years has provided significant insights into the mechanisms and molecular events that occur during this process. The modulatory effects of hsps on apoptosis are well documented, however, the mechanisms of hsp-mediated protection against apoptosis remain to be fully defined, although several hypotheses have been proposed. Elucidation of these mechanisms should reveal novel targets for manipulating the sensitivity of leukaemic cells to therapy. This review aims to explain the currently understood process of apoptosis and the effects of hsps on this process. Several proposed mechanisms for hsp protection against apoptosis and the therapeutic implications of hsps in leukaemia are also discussed.
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Affiliation(s)
- E M Creagh
- Department of Biochemistry, University College Cork, Lee Maltings, Prospect Row, Ireland
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135
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Creagh EM, Carmody RJ, Cotter TG. Heat shock protein 70 inhibits caspase-dependent and -independent apoptosis in Jurkat T cells. Exp Cell Res 2000; 257:58-66. [PMID: 10854054 DOI: 10.1006/excr.2000.4856] [Citation(s) in RCA: 155] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Heat shock protein 70 (hsp70) is a stress-inducible protein that prevents apoptosis induced by a wide range of cytotoxic agents by an as yet undefined mechanism. The caspase family of cysteine proteases have been attributed a central role in the execution of apoptosis. However, several cases of caspase-independent apoptosis have been recently reported, suggesting that caspases may not be necessary for apoptosis in all cells. This study examines the protective role of hsp70 in both caspase-dependent and -independent apoptosis. Hydrogen peroxide (H2O2) used at low and high concentrations in Jurkat T cells induces caspase-dependent and -independent apoptosis, respectively. A hsp70-transfected Jurkat clone was used to observe the protection mediated by hsp70 during these two forms of apoptosis. Results reveal that hsp70 inhibits both caspase-dependent and -independent apoptosis. Furthermore, measurement of caspase-3 activity during caspase-dependent apoptosis revealed that caspase activation was inhibited in hsp70 transfectants. Early apoptotic events, such as mitochondrial depolarization, cytochrome c release, and increased intracellular calcium, were demonstrated to be common to both caspase-dependent and -independent H2O2-induced apoptosis. The inhibition of these events by hsp70 suggests that hsp70 may be an important anti-apoptotic regulator, functioning at a very early stage in the apoptotic pathway.
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Affiliation(s)
- E M Creagh
- Department of Biochemistry, University College Cork, Ireland
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136
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Kim DK, Cho ES, Um HD. Caspase-dependent and -independent events in apoptosis induced by hydrogen peroxide. Exp Cell Res 2000; 257:82-8. [PMID: 10854056 DOI: 10.1006/excr.2000.4868] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To define the role of caspase-3 in H2O2-induced apoptosis, we introduced caspase-3 cDNA into MCF-7 breast carcinoma cells that otherwise lack caspase-3 expression. H2O2 treatment induced DNA fragmentation and nuclear condensation in the caspase-3-expressing cells, but not in the caspase-3-deficient cells. This indicated that caspase-3 is essential for nuclear events. However, H2O2 induced an externalization of membrane phosphatidylserine (PS) and cell death regardless of caspase-3 expression. These events were not suppressed by Ac-DEVD-CHO and Z-VAD-fmk, which inhibit DEVD-specific caspases and a broad spectrum of caspases, respectively. In Jurkat T cells, these inhibitors abolished H2O2-induced PS relocalization, but not cell death. Therefore, caspases appear to be dispensable for lethality by H2O2, but required for PS redistribution in a cell-type-specific manner.
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Affiliation(s)
- D K Kim
- Laboratory of Cell Biology, Yonsei Medical Research Center, Seoul, Korea
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137
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Aramaki Y, Takano S, Arima H, Tsuchiya S. Induction of apoptosis in WEHI 231 cells by cationic liposomes. Pharm Res 2000; 17:515-20. [PMID: 10888301 DOI: 10.1023/a:1007552529280] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
PURPOSE Liposomes are of considerable interest as drug carriers and immunoadjuvants. However, few investigators have studied the changes exerted by liposomes in the cells with which they interact. The purpose of this study was to investigate whether liposomes induce apoptosis in B cells. METHODS The mouse immature B cell line WEHI 231 cells and mouse splenic B cells were treated with liposomes, and the induction of apoptosis was evaluated by monitoring changes in DNA content, DNA fragmentation and chromatin condensation by flow cytometry, agarose gel electrophoresis and by morphological investigation. RESULTS Cationic liposomes induced apoptosis in WEHI 231 cells, but neutral and anionic liposomes did not. A contact time of 30 min between WEHI 231 cells and cationic liposomes was sufficient to induce apoptosis, and 80% of the cells showed hypodiploid DNA content. Apoptosis induced by cationic liposomes composed of stearylamine was inhibited by addition of the oxidant scavenger, N-acetyl-cysteine. CONCLUSIONS Cationic liposomes induced apoptosis in WEHI 231 cells, and the production of reactive oxygen species is important in the regulation of apoptosis induced by cationic liposomes. It is well known that cationic liposomes show cytotoxicity, and apoptosis may be one of the causes of this toxicity.
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Affiliation(s)
- Y Aramaki
- School of Pharmacy, Tokyo University of Pharmacy and Life Science, Hachioji, Japan.
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138
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Mäntymaa P, Siitonen T, Guttorm T, Säily M, Kinnula V, Savolainen ER, Koistinen P. Induction of mitochondrial manganese superoxide dismutase confers resistance to apoptosis in acute myeloblastic leukaemia cells exposed to etoposide. Br J Haematol 2000; 108:574-81. [PMID: 10759716 DOI: 10.1046/j.1365-2141.2000.01852.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We investigated the possible roles of mitochondrial manganese superoxide dismutase (MnSOD) and bcl-2 in etoposide-induced cell death in acute myeloblastic leukaemia (AML) using two subclones of the OCI/AML-2 cell line, the etoposide-sensitive (ES) and the etoposide-resistant (ER), as models. Cell death after 24 h exposure to 10 micromol/l etoposide was about 60% and 70% in the ES subclone and about 20% and 25% in the ER subclone, when analysed by trypan blue and annexin V respectively. Cytochrome c efflux from mitochondria to cytosol was observed after 4 h of exposure in both subclones, whereas the activation of caspase-3 was not detectable until after 12 h of exposure in the ES subclone and 24 h of exposure in the ER subclone, using Western blotting. The decrease in mitochondrial membrane potential, when analysed by the JC-1 probe fluorocytometrically, also appeared to take place later in the ER than in the ES subclone. Both subclones showed evident basal expression of MnSOD and bcl-2 by Western blotting. Etoposide caused a potent induction of MnSOD, more than 400% at 12 h, in the ER but not in the ES subclone. No significant change in bcl-2 expression could be observed in either of the subclones during exposure to etoposide when analysed by Western blotting or flow cytometry. In conclusion, we suggest that MnSOD might have a special role in the protection of AML cells against etoposide-induced cell death. Although unable to influence the cytochrome c efflux to cytosol, MnSOD might prevent the disruption of mitochondrial membrane potential, which evidently leads to cell death by releasing various activators of apoptosis.
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MESH Headings
- Antineoplastic Agents, Phytogenic/therapeutic use
- Apoptosis/drug effects
- Blotting, Western
- Caspase 3
- Caspases/metabolism
- Cytochrome c Group/metabolism
- Drug Resistance, Neoplasm
- Enzyme Induction/drug effects
- Enzyme Inhibitors/therapeutic use
- Etoposide/therapeutic use
- Humans
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/enzymology
- Leukemia, Myeloid, Acute/metabolism
- Membrane Potentials/drug effects
- Mitochondria/enzymology
- Mitochondria/metabolism
- Proto-Oncogene Proteins c-bcl-2/metabolism
- Superoxide Dismutase/biosynthesis
- Superoxide Dismutase/metabolism
- Tumor Cells, Cultured
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Affiliation(s)
- P Mäntymaa
- Department of Clinical Chemistry, University of Oulu, Finland
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139
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Hill IE, Murray C, Richard J, Rasquinha I, MacManus JP. Despite the internucleosomal cleavage of DNA, reactive oxygen species do not produce other markers of apoptosis in cultured neurons. Exp Neurol 2000; 162:73-88. [PMID: 10716890 DOI: 10.1006/exnr.2000.7322] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The cell death induced by hydroxyl radicals generated by Cu-phenanthroline and peroxynitrite generated by 3-morpholinosydnonimine hydrochloride (SIN-1) in rat primary cortical neuronal cultures was compared with the apoptotic death induced by staurosporine and the necrotic death induced by glutamate. Both SIN-1 and Cu-phenanthroline were capable of generating internucleosomal cleavage of DNA-a hallmark of apoptosis. Other characteristics of this cell death, such as nuclear morphology by light microscopy; DNA breaks by single-cell gel electrophoresis; the effects of the apoptotic inhibitors cycloheximide, aurintricarboxylic acid, and tosyl-l-lysine chloromethyl ketone; the measurement of caspase activity; and the effects of antioxidants, were then analyzed. The conclusion from these hallmarks of apoptosis is that the cell death induced by these reactive oxygen species is not apoptosis.
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Affiliation(s)
- I E Hill
- Institute for Biological Sciences, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada
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140
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Abstract
The effects of liposomes on apoptosis in macrophages were evaluated from DNA content and DNA fragmentation. Cationic liposomes composed of different kinds of cationic lipids induced apoptosis in mouse splenic macrophages and the macrophage-like cell line, RAW264.7 cells. Generation of reactive oxygen radicals from macrophages treated with cationic liposomes was detected using flow cytometry, and further apoptosis was inhibited by the addition of oxidant scavenger, N-acetylcysteine. From these findings, the production of reactive oxygen species may be important in the regulation of apoptosis induced by cationic liposomes.
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Affiliation(s)
- Y Aramaki
- Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo, Japan.
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141
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Suzuki S, Higuchi M, Proske RJ, Oridate N, Hong WK, Lotan R. Implication of mitochondria-derived reactive oxygen species, cytochrome C and caspase-3 in N-(4-hydroxyphenyl)retinamide-induced apoptosis in cervical carcinoma cells. Oncogene 1999; 18:6380-7. [PMID: 10597238 DOI: 10.1038/sj.onc.1203024] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
N-(4-Hydroxyphenyl)retinamide (4HPR) is currently used in cancer prevention and therapy trials. It is thought that its effects result from induction of apoptosis. 4HPR-induced apoptosis in human cervical carcinoma C33A cells involves enhanced generation of reactive oxygen species (ROS). In this study we explored the mechanism by which 4HPR increases ROS and induces apoptosis in these cells. 4HPR induced cytochrome c release from mitochondria to cytoplasm, activated caspase-3, and caused a membrane permeability transition (MPT). All these 4HPR's effects, as well as the induction of apoptosis, were inhibited by antioxidants, which decrease ROS. Thenoyltrifluoroacetone, a mitochondrial respiratory chain (MRC) complex II inhibitor, and carbonylcyanide m-chlorophenyl hydrazone, which uncouples electron transfer and ATP synthesis and inhibits ROS generation by MRC, inhibited 4HPR-induced ROS generation very effectively. Rotenone, an MRC complex I inhibitor was less effective and azide, an MRC complex IV inhibitor, exhibited a marginal effect. In contrast, antimycin A, an MRC complex III inhibitor, enhanced 4HPR-induced ROS generation. These findings suggest that 4HPR enhances ROS generation by affecting a target between complex II and complex III, presumably coenzyme Q. This effect is followed by release of cytochrome c, increased caspase-3 activity, induction of MPT and eventual DNA fragmentation and cell death.
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Affiliation(s)
- S Suzuki
- Department of Thoracic/Head and Neck Medical Oncology, University of Texas MD Anderson Cancer Center, Houston 77030, USA
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142
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Devitt GP, Creagh EM, Cotter TG. The antioxidant 4b,5,9b,10-Tetrahydroindeno[1,2-b]indole inhibits apoptosis by preventing caspase activation following mitochondrial depolarization. Biochem Biophys Res Commun 1999; 264:622-9. [PMID: 10543982 DOI: 10.1006/bbrc.1999.1576] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxidative stress appears to have a central role in the induction of apoptosis following the exposure of cells to a range of cytotoxic insults. The modulation of apoptosis by a diverse range of antioxidants has been reported in many systems. We demonstrate, for the first time, the anti-apoptotic properties of the antioxidant, 4b, 5,9b,10-tetrahydroindeno[1,2-b]indole (THII), in Jurkat T cells subjected to a number of cytotoxic insults. THII was found to inhibit the morphological features of apoptosis in cells treated with the cytotoxic agents camptothecin, actinomycin D and ultraviolet (UV) irradiation. However, THII was unable to inhibit apoptosis induced by anti-Fas IgM. Peroxide and superoxide anion production following UV treatment was monitored, and THII was found to only partially inhibit superoxide anion production. THII was unable to inhibit mitochondrial depolarization in UV, Camptothecin or anti-Fas-treated cells. Further downstream, THII exibited strong inhibition of caspase-3 activation in UV, but not in anti-Fas-treated cells. These results suggest that THII may exert its effects downstream of mitochondrial depolarization, but upstream of caspase-3 activation.
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Affiliation(s)
- G P Devitt
- Tumour Biology Laboratory, Department of Biochemistry, University College Cork, Cork, Ireland
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143
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Siitonen T, Alaruikka P, Mäntymaa P, Savolainen ER, Kavanagh TJ, Krejsa CM, Franklin CC, Kinnula V, Koistinen P. Protection of acute myeloblastic leukemia cells against apoptotic cell death by high glutathione and gamma-glutamylcysteine synthetase levels during etoposide-induced oxidative stress. Ann Oncol 1999; 10:1361-7. [PMID: 10631466 DOI: 10.1023/a:1008382912096] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Etoposide mediates its cytotoxicity by inducing apoptosis. Thus, mechanisms which regulate apoptosis should also affect drug resistance. Oxidants and antioxidants have been shown to participate in the regulation of apoptosis. We were interested in studying whether responsiveness of acute myeloblastic leukemia (AML) cells to etoposide is mediated by oxidative stress and glutathione levels. PATIENTS AND METHODS Two subclones of the OCI/AML-2 cell line which are etoposide-sensitive (ES), and etoposide-resistant (ER), were established by the authors at the University of Oulu, and used as models. Assays for apoptosis included externalization of phosphatidylserine (as evidenced by annexin V binding), and caspase activation as indicated by cleavage of poly(ADP-ribose)polymerase (Western blotting). Peroxide formation was analyzed by flow cytometry. Glutathione and gamma-glutamylcysteine synthetase (gamma-GCS) levels were determined spectrophotometrically and by Western blotting, respectively. RESULTS Etoposide-induced apoptosis was evident 12 hours after treatment in the ES subclone, but was apparent in the ER subclone only after 24 hours. The basal glutathione and gamma-GCS levels were higher in the ER than the ES subclone. Etoposide increased peroxide formation in both subclones after 12-hour exposure. Significant depletion of glutathione was observed in the ES subclone during etoposide exposure, while glutathione levels were maintained in the ER subclone. In neither of the subclones was induction of gamma-GCS observed during 24-hour exposure to etoposide. Furthermore, the catalytic subunit of gamma-GCS was cleaved during apoptosis, concurrent with depletion of intracellular glutathione. When glutathione was depleted by treatment with buthionine sulfoximine, a direct inhibitor of gamma-GCS, the sensitivity to etoposide was increased, particularly in the ER subclone. CONCLUSIONS The results underline the significance of glutathione biosynthesis in the responsiveness of AML cells to etoposide. The molecular mechanisms mediating glutathione depletion during etoposide exposure might include the cleavage of the catalytic subunit of gamma-GCS.
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MESH Headings
- Antineoplastic Agents, Phytogenic/pharmacology
- Apoptosis/physiology
- Blotting, Western
- Drug Resistance, Neoplasm
- Etoposide/pharmacology
- Flow Cytometry
- Glutamate-Cysteine Ligase/drug effects
- Glutamate-Cysteine Ligase/metabolism
- Humans
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/enzymology
- Leukemia, Myeloid, Acute/pathology
- Oxidative Stress/drug effects
- Oxidative Stress/physiology
- Sensitivity and Specificity
- Tumor Cells, Cultured
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Affiliation(s)
- T Siitonen
- Department of Internal Medicine, University of Oulu, Finland
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144
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Pourzand C, Tyrrell RM. Apoptosis, the Role of Oxidative Stress and the Example of Solar UV Radiation. Photochem Photobiol 1999. [DOI: 10.1111/j.1751-1097.1999.tb08239.x] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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145
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Mihalik R, Bauer P, Peták I, Krajcsi P, Marton A, Kun E, Kopper L. Interaction of cytocidal drugs and the inhibition of caspase-3 by 3-nitrosobenzamide. Int J Cancer 1999; 82:875-9. [PMID: 10446456 DOI: 10.1002/(sici)1097-0215(19990909)82:6<875::aid-ijc17>3.0.co;2-t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The effect of 3-nitrosobenzamide (NOBA) on the etoposide, staurosporine and dexamethason induced rapid (4-6 hr), caspase-dependent apoptosis was investigated in thymocytes and lymphoma cells by flow cytometric assay of DNA fragmentation. When NOBA (ED(50) = 4 microM) was added to these cell systems, the rapid onset of apoptosis was prevented. Such apparent protection by NOBA was related to the inactivation of caspase-3, by s-nitrosylation of 1.3 mol -SH per enzyme molecule out of 7 -SH groups. Since NOBA by itself induces DNA fragmentation within 18 hr in lymphoma cells, our results indicate that at least two active cell death pathways exist with apparent dissimilar kinetics and molecular mechanisms.
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Affiliation(s)
- R Mihalik
- I. Institute of Pathology and Experimental Cancer Research, Semmelweis University of Medicine, Budapest, Hungary
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146
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Hijikata M, Matsumoto HN, Kobayashi A, Nifuji A, Noda M, Natori S. Induction of apoptosis of monocyte-macrophage lineage cells by 5-S-GAD. FEBS Lett 1999; 457:405-8. [PMID: 10471818 DOI: 10.1016/s0014-5793(99)01077-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
We found that 5-S-GAD, an insect-derived antibacterial peptide, inhibited murine osteoclast formation in vitro. We examined the specific time point of the inhibitory action of 5-S-GAD on osteoclast formation and found that it mainly suppressed differentiation of osteoclasts in the middle of the culture period. Using HL60 cells that are able to differentiate into multinucleated macrophage-like cells, we found that 5-S-GAD induced apoptosis of HL60 cells by producing H(2)O(2). Thus, the inhibition of osteoclast formation by 5-S-GAD could be, in part, due to apoptosis of the cells of an osteoclast lineage.
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Affiliation(s)
- M Hijikata
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
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147
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Bhaumik S, Anjum R, Rangaraj N, Pardhasaradhi BV, Khar A. Curcumin mediated apoptosis in AK-5 tumor cells involves the production of reactive oxygen intermediates. FEBS Lett 1999; 456:311-4. [PMID: 10456330 DOI: 10.1016/s0014-5793(99)00969-2] [Citation(s) in RCA: 154] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Curcumin, the active ingredient of the rhizome of Curcuma longa has anti-inflammatory, antioxidant and antiproliferative activities. Although its precise mode of action remains elusive, studies have shown that chemopreventive action of curcumin might be due to its ability to induce apoptosis in cancer cells. Curcumin was shown to be responsible for the inhibition of AK-5 tumor (a rat histiocytoma) growth by inducing apoptosis in AK-5 tumor cells via caspase activation. This study was designed to investigate the mechanism leading to the induction of apoptosis in AK-5 tumor cells. Curcumin treatment resulted in the hyperproduction of reactive oxygen species (ROS), loss of mitochondrial membrane potential (delta psi(m)) and cytochrome c release to the cytosol, with the concomitant exposure of phosphatidylserine (PS) residues on the cell surface. This study suggests redox signalling and caspase activation as the mechanisms responsible for the induction of curcumin mediated apoptosis in AK-5 tumor cells.
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Affiliation(s)
- S Bhaumik
- Centre for Cellular and Molecular Biology, Hyderabad, India
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148
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Ikeda M, Kodama H, Fukuda J, Shimizu Y, Murata M, Kumagai J, Tanaka T. Role of radical oxygen species in rat testicular germ cell apoptosis induced by heat stress. Biol Reprod 1999; 61:393-9. [PMID: 10411517 DOI: 10.1095/biolreprod61.2.393] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The present study was designed to clarify the role of radical oxygen species in testicular germ cell apoptosis induced by heat stress. Testicular cells isolated from immature rats were cultured with or without elevated temperature, and occurrence of apoptosis in these cells was defined by the appearance of DNA fragmentation following agarose gel electrophoresis and by flow cytometric quantification of apoptotic cells. At 32.5 degrees C, < 1% of cells showed signs of apoptosis throughout the culture period, whereas under heat stress, the proportion of apoptotic cells increased to 5% at 37 degrees C after 24 h of culture, or to 14% after 1-h exposure at 43 degrees C followed by 23-h culture at 32.5 degrees C. Similar to the effect of heat stress, exogenously supplied oxygen free radicals also induced apoptosis. In contrast, treatment with catalase significantly attenuated heat stress-induced apoptosis. Furthermore, heat stress of testicular cells was associated with an increased intracellular peroxide level as measured by a fluorescent probe, 2', 7'-dichlorofluorescin diacetate. In conclusion, our data indicate the involvement of radical oxygen species during testicular germ cell apoptosis induced by heat stress. This study provides a useful in vitro model for the study of testicular germ cell apoptosis.
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Affiliation(s)
- M Ikeda
- Department of Obstetrics and Gynecology, Akita University School of Medicine, and Akita University College of Allied Medical Science, Akita city, 010-0041 Japan
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149
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Straface E, Natalini B, Monti D, Franceschi C, Schettini G, Bisaglia M, Fumelli C, Pincelli C, Pellicciari R, Malorni W. C3-fullero-tris-methanodicarboxylic acid protects epithelial cells from radiation-induced anoikia by influencing cell adhesion ability. FEBS Lett 1999; 454:335-40. [PMID: 10431834 DOI: 10.1016/s0014-5793(99)00812-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Anoikia is a type of apoptotic cell death that occurs in cells that are substrate-restricted in their growth. Buckminsterfullerenes represent a new class of chemical compounds with wide potential pharmacological antioxidant activity. In this report we provide the first demonstration that a water-soluble fullerene derivative, C3-fullero-tris-methanodicarboxylic acid, synthesized in our laboratories, is capable of inducing anoikia resistance in epithelial cells by a mechanism involving a 'trophic' effect on cell spreading-associated cytoskeletal components, i.e. on actin microfilaments.
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Affiliation(s)
- E Straface
- Department of Ultrastructures, Istituto Superiore di Sanità, Rome, Italy
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150
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Ikeda K, Kajiwara K, Tanabe E, Tokumaru S, Kishida E, Masuzawa Y, Kojo S. Involvement of hydrogen peroxide and hydroxyl radical in chemically induced apoptosis of HL-60 cells. Biochem Pharmacol 1999; 57:1361-5. [PMID: 10353256 DOI: 10.1016/s0006-2952(99)00055-6] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Effects of three kinds of antagonists against reactive oxygen species were evaluated at the same time in chemically induced apoptosis of human leukemic HL-60 cells. Apoptosis of HL-60 cells induced by actinomycin D, H7, 1-beta-D-arabinofuranosylcytosine, and daunorubicin was inhibited significantly by radical scavengers (vitamin E, N-acetyl-L-cysteine, and mercaptoethanol), catalase, and a spin trap, N-t-butyl-alpha-phenylnitrone. These results suggest that hydrogen peroxide and hydroxyl radical are common mediators of apoptosis caused by these chemicals with apparently different functional mechanisms. The consumption of vitamin E to inhibit apoptosis induced by actinomycin D was undetectable, suggesting that the generation of reactive oxygen species during apoptosis was not very extensive. Radicals were suggested to be a mediator of apoptosis of HL-60 cells induced by cisplatin based on the observations that the above inhibitors, except catalase, effectively inhibited apoptosis by the drug.
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Affiliation(s)
- K Ikeda
- Department of Food Science and Nutrition, Nara Women's University, Japan
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