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논문 기본 정보

자료유형
학술저널
저자정보
Dandan Chen (Wuhan Sports Univ) Ying Zhang (Wuhan Sports Univ) Meng Zhang (Wuhan Sports Univ) Xianjuan Kou (Wuhan Sports Univ)
저널정보
아시아건강운동학회 Journal of Asian Society for Health & Exercise The Journal of Asian Society for Health & Exercise Vol.4 No.2
발행연도
2022.12
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1 - 18 (18page)

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PURPOSE : Our study aims to explore the efficiency of DHM on 6-month-old Senescence-acceleratedprone mice (SAMP8) mice with sarcopenia and to explore the underlying molecular mechanisms.
METHODS : 40 mice were divided into four groups: SAMR1, SAMP8 Control, DHM (at the dose of 15mg/kg/d), DHM+CQ (CQ at the dose of 5mg/kg/d) for 8 weeks. The measurements included: changes in muscle HE pathology, Western blot of Atrogin-1 and MuRF1, autophagy-related proteins, apoptosis, senescence in gastrocnemius.
RESULTS : Compared with the negative control SAMR1, 6-month-old SAMP8 mice presented lower muscle mass/body ratio, cross-sectional area of gastrocnemius muscle. Moreover, the declined mass of gastrocnemius muscle is accompanied by impaired autophagy, excessive senescence, apoptosis as a result of up-regulated Atrogin-1 and MuRF1. However, 8 weeks of DHM intervention suppressed the decline of gastrocnemius accompanied by down-regulated Atrogin-1 and MuRF1, increased autophagy, decreased apoptosis as well as senescence. Additionally, compared with SAMP8 group, DHM activates PI3K-Akt signaling. Interestingly, combination DHM and chloroquine (an autophagy inhibitor, CQ) reversed these changes. Similar with vivo, DHM also inhibited dexamethasone (Dex)-induced up-regulation of Atrogin-1 and MuRF1, apoptosis, cellular senescence as well as decreased LC3 II in mouse skeletal muscle C2C12 myotubes. However, combination DHM and LY294002 (a PI3K specific inhibitor) abolished the protective response of DHM.
CONCLUSIONS : Taken together, DHM-induced autophagy is beneficial for delaying sarcopenia by modulating Akt signal pathways in SAMP8 mice.

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