Dietary supplementation with isoflavones prevents muscles wasting in tumor-bearing mice

Katsuya Hirasaka, Shinobu Saito, Saki Yamaguchi, Riho Miyazaki, Yao Wang, Marie Haruna, Shigeto Taniyama, Atsushi Higashitani, Junji Terao, Takeshi Nikawa, Katsuyasu Tachibana

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Summary Proinflammatory cytokines contribute to the progression of muscle wasting caused by ubiquitin-proteasome-dependent proteolysis. We have previously demonstrated that isoflavones, such as genistein and daidzein, prevent TNF-α-induced muscle atrophy in C2C12 myotubes. In this study, we examined the effect of dietary flavonoids on the wasting of muscle. Mice were divided into the following four groups: vehicle-injected (control) mice fed the normal diet (CN); tumor-bearing mice fed the normal diet (TN); control mice fed the isoflavone diet (CI); and tumor-bearing mice fed the isoflavone diet (TI). There were no significant differences in the intake of food or body weight gain among these four groups. The wet weight and myofiber size of gastrocnemius muscle in TN significantly decreased, compared with those in CN. Interestingly, the wet weight and myofiber size of gastrocnemius muscle in TI were nearly the same as those in CN and CI, although isoflavone supplementation did not affect the increased tumor mass or concentrations of proinflammatory cytokines, such as TNF-α and IL-6, in the blood. Moreover, increased expression of muscle-specific ubiquitin ligase genes encoding MAFbx/Atrogin-1 and MuRF1 in the skeletal muscle of TN was significantly inhibited by the supplementation of isoflavones. In parallel with the expression of muscle-specific ubiquitin ligases, dietary isoflavones significantly suppressed phosphorylation of ERK in tumor-bearing mice. These results suggest that dietary isoflavones improve muscle wasting in tumor-bearing mice via the ERK signaling pathway mediated-suppression of ubiquitin ligases in muscle cells.

Original languageEnglish
Pages (from-to)178-184
Number of pages7
JournalJournal of nutritional science and vitaminology
Volume62
Issue number3
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • Isoflavone
  • Muscle wasting
  • Tumor
  • Ubiquitin ligase

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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