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Theaflavins prevent cartilage degeneration via AKT/FOXO3 signaling in vitro

Jun Li1, Jianping Zheng1

  • 1Department of Orthopedics, Xiangyang Central Hospital, The Affiliated Hospital of Hubei College of Arts and Science, Xiangyang, Hubei 441021, P.R. China.

Molecular Medicine Reports
|December 21, 2018
PubMed

Insights

Theaflavins (TFs) protect cartilage from degeneration by reducing oxidative stress and apoptosis. This study suggests TFs may be a potential drug for preventing cartilage damage through AKT/FOXO3 signaling.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Theaflavins (TFs) are key tea polyphenols with antioxidant properties.
  • Oxidative stress from reactive oxygen species (ROS) disrupts cartilage homeostasis, leading to degeneration.
  • Cartilage degeneration involves catabolic factors, apoptosis, and DNA damage.

Purpose of the Study:

  • To investigate the protective effects of TFs against hydrogen peroxide (H2O2)-induced cartilage degeneration in vitro.
  • To elucidate the molecular mechanisms underlying TF-mediated protection, focusing on oxidative stress, apoptosis, and DNA damage pathways.

Main Methods:

  • Cell viability assessed using Cell Counting kit (CCK-8).
  • ROS generation, apoptosis, and DNA damage detected by flow cytometry.
  • Gene and protein expression analyzed via RT-qPCR and Western blotting.
  • Key signaling pathways (AKT/FOXO3) investigated.

Main Results:

  • TFs reduced expression of catabolic factors (MMP-13, IL-1, GPC-39).
  • TFs inhibited ROS, apoptosis, and DNA damage, downregulating cleaved caspase-3, BAX, ATR, and ATM.
  • TFs enhanced antioxidant enzymes (GPx1, catalase) and modulated AKT/FOXO3 signaling.
  • AKT activation reversed TF-induced protection, confirming the pathway.

Conclusions:

  • TFs prevent cartilage degeneration in vitro by mitigating oxidative stress, apoptosis, and DNA damage.
  • The protective effects of TFs are mediated through the AKT/FOXO3 signaling pathway.
  • TFs show potential as a therapeutic agent for cartilage degeneration prevention.
Keywords:
heaflavinsoxidative stressAKT/Forkhead box O3cartilage degeneration

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