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01-09-2020 | Dexamethasone | Original Paper

EGCG down-regulates MuRF1 expression through 67-kDa laminin receptor and the receptor signaling is amplified by eriodictyol

Authors: Motoki Murata, Yuki Shimizu, Yuki Marugame, Ayaka Nezu, Konatsu Fujino, Shuhei Yamada, Motofumi Kumazoe, Yoshinori Fujimura, Hirofumi Tachibana

Published in: Journal of Natural Medicines | Issue 4/2020

Abstract

(–)-epigallocatechin-3-O-gallate (EGCG) is a bioactive polyphenol in green tea. Previous studies have demonstrated the beneficial effects of EGCG on muscle mass and muscle atrophy. In the current study, we investigated the mechanisms underlying effect of EGCG on muscle atrophy. It was demonstrated that EGCG suppressed muscle-specific ubiquitin ligase, muscle RING Finger 1 (MuRF1) expression through 67-kDa laminin receptor (67LR). Previous studies have shown that eriodictyol potentiates the anti-tumor activities of EGCG by amplifying 67LR signaling. Therefore, we investigated the effects of EGCG and eriodictyol on the MuRF1 expression in C2C12 myotubes. The combined treatment of EGCG and eriodictyol significantly suppressed MuRF1 expression in dexamethasone-treated C2C12 myotubes. Tail suspension was maintained for 10 consecutive days using C57BL6/J mice, and during this time EGCG and eriodictyol were orally administered. In the gastrocnemius muscle, the muscle mass loss was inhibited by the combination of EGCG and eriodictyol. Therefore, EGCG may prevent muscle atrophy by inducing 67LR signaling and eriodictyol amplifies this pathway.

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Title: EGCG down-regulates MuRF1 expression through 67-kDa laminin receptor and the receptor signaling is amplified by eriodictyol
Authors: Motoki Murata
Yuki Shimizu
Yuki Marugame
Ayaka Nezu
Konatsu Fujino
Shuhei Yamada
Motofumi Kumazoe
Yoshinori Fujimura
Hirofumi Tachibana
Publication date: 01-09-2020
Publisher: Springer Singapore
Keyword: Dexamethasone
Published in: Journal of Natural Medicines / Issue 4/2020
Print ISSN: 1340-3443
Electronic ISSN: 1861-0293
DOI: https://doi.org/10.1007/s11418-020-01417-6

At a glance: The STEP trials

Springer Medicine

EGCG down-regulates MuRF1 expression through 67-kDa laminin receptor and the receptor signaling is amplified by eriodictyol

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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