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Title of article :
Protein breakdown on whole-body and organ level in non-cachectic tumour-bearing mice undergoing surgery
Author/Authors :
Yvonne L.J. Vissers، نويسنده , , Maarten F. von Meyenfeldt، نويسنده , , Josep M. Argilés، نويسنده , , Yvette C. Luiking، نويسنده , , Cornelis H.C. Dejong، نويسنده , , Nicolaas E.P. Deutz، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
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Abstract :
Background & aims Since both cancer and surgery are known to alter protein turnover, we investigated how the presence of tumour affects post-operative protein breakdown. Methods Controls and tumour-bearing non-cachectic mice were studied, both with and without laparotomy (n=8 per group). One day after laparotomy, stable isotopes of phenylalanine and 3-methylhistidine were used in a steady-state protocol to assess total protein breakdown on whole-body level and in muscle, intestines, liver and kidney, in addition to whole-body myofibrillar protein breakdown and body composition. Proteasomal chymotrypsin-like activity was measured to determine activity of the ATP-dependent ubiquitin pathway. Results On whole-body level, the presence of tumour increased total protein breakdown from 47±6 to 58±4 nmol/10 g/min (p<0.05) and myofibrillar protein breakdown from 0.70±0.04 to 1.22±0.14 nmol/10 g/min (p<0.05) without affecting protein breakdown in organs, body composition or proteasomal activity. Laparotomy increased myofibrillar protein breakdown in controls (from 0.70±0.04 to 0.98±0.12 nmol/10 g/min, p<0.05) and tumour-bearing mice (from 1.22±0.14 to 1.54±0.22 nmol/10 g/min, p=0.15) to a similar extent. Conclusions Whole-body total protein breakdown, total protein breakdown across organs, body composition or proteasomal activity were not affected by laparotomy. Tumour-bearing mice had increased total and myofibrillar protein breakdown on whole-body level even before weight loss was obvious. However, this did not affect the post-operative response in protein breakdown or body composition.
Keywords :
Protein breakdown , CANCER , Myofibrillar protein , proteasome , body composition , Amino acid , stable isotopes , surgery
Journal title :
Clinical Nutrition
Journal title :
Clinical Nutrition
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