국내기사
Stimulation of AMPK activation and glucose uptake by ethanol extracts of Lespedeza cuneata in L6 myotubes = 비수리(Lespedeza cuneate) 에탄올 추출물에 의한 AMPK 활성화 및 포도당 흡수 촉진
저자명
Buyng Su Hwang, Min Jin Kim, Young Taek Oh, Ji Su Choi, Dae Won Jeong, Bongsoo Lee, Yong Tae Jeong
Type 2 diabetes mellitus is characterized by impaired glucose uptake in skeletal muscle, and the AMP-activated protein kinase (AMPK) is a relevant target for metabolic improvement. This study evaluated whether ethanol extracts and polarity-based solvent fractions of Lespedeza cuneata enhance AMPK activation and glucose uptake in differentiated L6 myotubes and whether extraction ethanol ratio relates to bioactivity. Whole-plant material was extracted with 70% ethanol and partitioned to obtain solvent fractions, including a hexane fraction (LC-H). The AMPK signaling was assessed by Western blot analysis of phosphorylated AMPK and acetyl-CoA carboxylase (ACC), and glucose uptake was quantified using the glucose uptake assay kit. Ethanol extracts increased p-AMPK and p-ACC relative to control, and LC-H induced concentration-dependent phosphorylation of AMPK/ACC. Consistently, LC-H increased glucose uptake in a dose-dependent manner, with the greatest effect at 200 μg/ml (21.4% over control). In addition, extracts prepared with higher ethanol content tended to elicit greater glucose-uptake activity than those prepared with lower ethanol content, indicating that extraction solvent composition and fraction polarity influence recovery of active constituents. Collectively, these findings suggest that L. cuneata ethanol extracts and the hexane fraction enhance AMPK signaling and increase glucose uptake in L6 myotubes, supporting L. cuneata as a candidate natural resource for skeletal-muscle-targeted metabolic improvement and providing a basis for subsequent constituent identification and mechanism-oriented studies.