Escape from apoptosis after prolonged serum deprivation is associated with the regulation of the mitochondrial death pathway by Bcl-x(l)

Zhang, Xiao-Ju, Yan, Jun, Cuttle, Leila, Endre, Zoltan, & Gobe, Glenda (2000) Escape from apoptosis after prolonged serum deprivation is associated with the regulation of the mitochondrial death pathway by Bcl-x(l). Biochemical and Biophysical Research Communications, 277(2), pp. 487-493.

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Abstract

Bcl-x(l) and Bax play important roles in the regulation of apoptosis. This study investigated the involvement of the mitochondrial death pathway and the role of Bcl-x(l) and Bax in the escape from apoptosis after prolonged serum deprivation in Madin-Darby canine kidney (MDCK) cells. Low level apoptosis and basal activity of the mitochondrial death pathway were detectable in normal cell growth. In serum deprivation, mitosis was partially suppressed, and the mitochondrial activity was stimulated. The level of apoptosis continuously rose over 48 h. This rise was concomitant with the increasing presence of cytochrome c in cytosol. However, both apoptosis and cytosolic cytochrome c fell dramatically at 72 h. Elevation of whole cell Bcl-x(l) and redistribution of Bcl-x(l) protein from cytosol to the membrane at 48 h and 72 h was observed. Redistribution of Bax protein from the membrane to cytosol occurred at 24 h, and remained steady to 72 h. Bax/Bcl-x(l) coimmunoprecipitation by anti-Bax antibody showed reduced Bax/Bcl-x(l) interaction at the membrane at 72 h, but not at 24 or 48 h. These results suggest that apoptosis upon serum withdrawal results from the leakage of cytochrome c to cytosol. Amelioration of the leakage of cytochrome c and apoptosis requires not only the increase of Bcl-x(l)/Bax ratio, but also the release of Bcl-x(l) from Bax at the membrane.

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18 citations in Web of Science®
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ID Code: 67229
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Animals, *Apoptosis, Blotting, Western, Cell Division, Cell Line, Coloring Agents/pharmacology, Culture Media, Serum-Free, Cytochrome c Group/metabolism, Cytosol/metabolism, Dogs, Mitochondria/*metabolism, Mitosis, Precipitin Tests, Proliferating Cell Nuclear Antigen/metabolism, Protein Binding, Proto-Oncogene Proteins/*metabolism, Proto-Oncogene Proteins c-bcl-2/*metabolism, Tetrazolium Salts/pharmacology, Thiazoles/pharmacology, Time Factors, bcl-2-Associated X Protein, bcl-X Protein
DOI: 10.1006/bbrc.2000.3699
ISSN: 0006-291X
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Deposited On: 26 Feb 2014 00:44
Last Modified: 26 Feb 2014 00:44

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