Ubiquitin was significantly upregulated in muscle of gastric cancer compared with the control muscles. Over expression of ubiquitin in muscle of gastric cancer were associated with TNM stage and weight loss. Skeletal muscle wasting

is a major reason for morbidity and mortality in many chronic disease states, disuse conditions and aging. The ubiquitin-proteasome and autophagy-lysosomal systems are the two major proteolytic pathways involved in regulation of both physiological and pathological muscle wasting. The study demonstrate that the expression level of tumor necrosis factor (α) receptor adaptor protein 6 (TRAF6), a protein involved in receptor-mediated activation of several signaling pathways, is enhanced in skeletal muscle during atrophy [9, 10]. To explore the relation of TRAF6 expression in the skeletal #buy PF-04929113 randurls[1|1|,|CHEM1|]# muscle of gastric cancer patients. We assessed the expression of TRAF6 in 29 control muscles and 102 patient muscles. TRAF6 was significantly upregulated in muscle of gastric cancer compared with the control muscles, Overexpression of TRAF6 in muscle of gastric cancer were associated with TNM MK-4827 in vivo stage, the level of serum albumin and percent of weight loss. The study showed overexpression

of TRAF6 may play important role in gastric cancer cachexia. Paul’s study discover that TRAF6 possesses E3 ubiquitin ligase activity causing lysine-63-linked polyubiquitination of target proteins. Muscle-wasting stimuli could up regulate the expression of TRAF6 and auto-ubiquitination. Muscle-specific depletion of TRAF6 preserves skeletal muscle mass in a

mouse model of cancer cachexia or denervation. Inhibition of TRAF6 also blocks the expression of the components of the ubiquitin-proteasome system (UPS) and auto phagosome formation in atrophying skeletal ever muscle [15]. We also examined TRAF6 expression in skeletal muscle with gastric cancer and its correlation with ubiquitin status. We found a positive correlation between TRAF6 and ubiquitin expression, suggesting that TRAF6 may up regulates ubiquitin activity in cancer cachexia. While more investigations are required to understand its mechanisms of TRAF6 and ubiquitin in skeletal muscle. Correct the catabolic-anabolic imbalance is essential for the effective treatment of cancer cachexia. Acknowledgments Work was supported by Zhejiang Provincial Department of Science and Technology Research Foundation (2011C33009). References 1. Gullett N, Rossi P, Kucuk O, Johnstone PA: Cancer-induced cachexia: a guide for the oncologist. J Soc Integr Oncol 2009,7(4):155–169.PubMed 2. Evans WJ: Skeletal muscle loss: cachexia, sarcopenia, and inactivity. Am J Clin Nutr 2010,91(4):1123S-1127S.PubMedCrossRef 3. Evans WJ, Morley JE, Argilés J, et al.: Cachexia: a new definition. Clin Nutr 2008,27(6):793–799.PubMedCrossRef 4. Dodson S, Baracos VE, Jatoi A, et al.