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Published in: BMC Cancer 1/2008

Open Access 01-12-2008 | Research article

Metabolic and morphological alterations induced by proteolysis-inducing factor from Walker tumour-bearing rats in C2C12myotubes

Authors: Claudia L Yano, Gislaine Ventrucci, William N Field, Michael J Tisdale, Maria Cristina C Gomes-Marcondes

Published in: BMC Cancer | Issue 1/2008

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Abstract

Background

Patients with advanced cancer suffer from cachexia, which is characterised by a marked weight loss, and is invariably associated with the presence of tumoral and humoral factors which are mainly responsible for the depletion of fat stores and muscular tissue.

Methods

In this work, we used cytotoxicity and enzymatic assays and morphological analysis to examine the effects of a proteolysis-inducing factor (PIF)-like molecule purified from ascitic fluid of Walker tumour-bearing rats (WF), which has been suggested to be responsible for muscle atrophy, on cultured C2C12 muscle cells.

Results

WF decreased the viability of C2C12 myotubes, especially at concentrations of 20–25 μg.mL-1. There was an increase in the content of the pro-oxidant malondialdehyde, and a decrease in antioxidant enzyme activity. Myotubes protein synthesis decreased and protein degradation increased together with an enhanced in the chymotrypsin-like enzyme activity, a measure of functional proteasome activity, after treatment with WF. Morphological alterations such as cell retraction and the presence of numerous cells in suspension were observed, particularly at high WF concentrations.

Conclusion

These results indicate that WF has similar effects to those of proteolysis-inducing factor, but is less potent than the latter. Further studies are required to determine the precise role of WF in this experimental model.
Appendix
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Metadata
Title
Metabolic and morphological alterations induced by proteolysis-inducing factor from Walker tumour-bearing rats in C2C12myotubes
Authors
Claudia L Yano
Gislaine Ventrucci
William N Field
Michael J Tisdale
Maria Cristina C Gomes-Marcondes
Publication date
01-12-2008
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2008
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-8-24

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