Abstract
The potential for inhibitors of nuclear factor-κB (NF-κB) activation to act as inhibitors of muscle protein degradation in cancer cachexia has been evaluated both in vitro and in vivo. Activation of NF-κB is important in the induction of proteasome expression and protein degradation by the tumour factor, proteolysis-inducing factor (PIF), since the cell permeable NF-κB inhibitor SN50 (18 μM) attenuated the expression of 205 proteasome α-subunits, two subunits of the 195 regulator MSSI and p42, and the ubiquitin-conjugating enzyme, E214k, as well as the decrease in myosin expression in murine myotubes. To assess the potential therapeutic benefit of NF-κB inhibitors on muscle atrophy in cancer cachexia, two potential inhibitors were employed; curcumin (50 μM) and resveratrol (30 μM). Both agents completely attenuated total protein degradation in murine myotubes at all concentrations of PIF, and attenuated the PIF-induced increase in expression of the ubiquitin-proteasome proteolytic pathway, as determined by the 'chymotrypsin-like' enzyme activity, proteasome subunits and E2 14k. However, curcumin (150 and 300 mg kg-1) was ineffective in preventing weight loss and muscle protein degradation in mice bearing the MAC16 tumour, whereas resveratrol (1 mg kg-1) significantly attenuated weight loss and protein degradation in skeletal muscle, and produced a significant reduction in NF-κB DNA-binding activity. The inactivity of curcumin was probably due to a low bioavailability. These results suggest that agents which inhibit nuclear translocation of NF-κB may prove useful for the treatment of muscle wasting in cancer cachexia.
Original language | English |
---|---|
Pages (from-to) | 1742-1750 |
Number of pages | 9 |
Journal | British Journal of Cancer |
Volume | 91 |
Issue number | 9 |
DOIs | |
Publication status | Published - 26 Oct 2004 |
Bibliographical note
© 2004 Cancer Research UK Creative Commons Attribution-NonCommercial-Share-Alike 3.0 licence, subject to the conditions listed at http://creativecommons.org/licences/by-nc-sa/3.0/Keywords
- cancer cachexia
- muscle wasting
- NF-κB
- proteasome expression
Fingerprint
Dive into the research topics of 'Induction of proteasome expression in skeletal muscle is attenuated by inhibitors of NF-κB activation'. Together they form a unique fingerprint.Student theses
-
Cellular signalling pathways involved in muscle atrophy in cancer cachexia
Wyke, S. M. (Author), Tisdale, M. J. (Supervisor), Sept 2004Student thesis: Doctoral Thesis › Doctor of Philosophy
File