| Apoptosis induced by interferon-alpha and antagonized by EGF is regulated by caspase-3-mediated cleavage of gelsolin in human epidermoid cancer cells. | |
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MedLine Citation:
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PMID: 15281090 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We have previously reported that interferon-alpha (IFNalpha) induces apoptosis and EGF can antagonize this effect in human epidermoid cancer KB cells. Since apoptosis occurs together with cytoskeleton reorganization we have evaluated if IFNalpha and EGF could modulate cell remodeling in our experimental conditions. We have found that 48 h 1,000 IU/ml IFNalpha induced structural reorganization of stress fibers and membrane delocalization and partial capping of the actin severing protein gelsolin. The transfection of KB cells with both a wild type (WT) or a C-terminal truncated form of gelsolin caused overexpression of the protein and an increase of both the spontaneous and IFNalpha-induced apoptosis and cell cytoskeletal modifications. In fact, after 48 h of treatment IFNalpha induced 45% of apoptotic cell death in parental cells while an approximately 80% of cell population was apoptotic in transfected cells. These effects occurred together with an increase of the expression and consequent degradation of gelsolin. Again the addition of EGF to IFNalpha-treated transfected cells caused a recovery of the apoptosis. Notably, IFNalpha and EGF did not modify the expression of other molecules associated to cytoskeleton such as focal adhesion kinase and vinculin. In the same experimental conditions IFNalpha induced also gelsolin cleavage that occurred together with caspase-3 activation and release of cytochrome c. All these effects were antagonized by the exposure of IFNalpha-treated KB to 10 nM EGF for the last 12 h. Moreover, the specific inhibition of caspase-3 with 20 microM DEVD completely abrogated apoptosis and gelsolin cleavage induced by IFNalpha. In conclusion, our data are the first demonstration that IFNalpha can induce morphological cell changes that are peculiar of apoptosis onset through the caspase-3-mediated cleavage of gelsolin. Furthermore, we have demonstrated that EGF is able to antagonize these effects through the inhibition of caspase-3 activation. |
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Authors:
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M Boccellino; G Giuberti; L Quagliuolo; M Marra; A M D'Alessandro; H Fujita; A Giovane; Alberto Abbruzzese; Michele Caraglia |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cellular physiology Volume: 201 ISSN: 0021-9541 ISO Abbreviation: J. Cell. Physiol. Publication Date: 2004 Oct |
Date Detail:
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Created Date: 2004-07-28 Completed Date: 2004-10-20 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0050222 Medline TA: J Cell Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 71-83 Citation Subset: IM |
Affiliation:
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Dipartimento di Biochimica e Biofisica, Seconda Università di Napoli, Naples, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Antineoplastic Agents
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pharmacology* Apoptosis / drug effects, physiology* Carcinoma, Squamous Cell* Caspase 3 Caspases / metabolism Cell Line, Tumor / cytology, drug effects Cytochromes c / metabolism Epidermal Growth Factor / pharmacology* Gelsolin / genetics, metabolism* Gene Expression Humans Interferon-alpha / pharmacology* Oropharyngeal Neoplasms* |
| Chemical | |
Reg. No./Substance:
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0/Antineoplastic Agents; 0/Gelsolin; 0/Interferon-alpha; 62229-50-9/Epidermal Growth Factor; 9007-43-6/Cytochromes c; EC 3.4.22.-/CASP3 protein, human; EC 3.4.22.-/Caspase 3; EC 3.4.22.-/Caspases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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