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Inhibition of osteoclast activation by phloretin through disturbing αvβ3 integrin-c-Src pathway

Eun-Jung Lee1, Jung-Lye Kim1, Ju-Hyun Gong1

  • 1Department of Food Science and Nutrition, Hallym University, Chuncheon 200-702, Republic of Korea.

Biomed Research International
|April 3, 2015
PubMed

Insights

Phloretin inhibits osteoclast actin organization by disrupting key signaling pathways, including αvβ3 integrin-c-Src-Pyk2/Syk. This finding reveals phloretin

Area of Science:

  • Cell Biology
  • Biochemistry
  • Pharmacology

Background:

  • Osteoclast differentiation and function are regulated by complex signaling pathways.
  • Disruption of actin cytoskeletal organization is crucial for osteoclast activity.
  • Phloretin's effects on cellular signaling are not fully understood.

Purpose of the Study:

  • To investigate the inhibitory effects of phloretin on actin cytoskeletal organization in osteoclasts.
  • To elucidate the specific signaling pathways targeted by phloretin in osteoclasts.

Main Methods:

  • In vitro studies using RAW 264.7 macrophages stimulated with RANKL.
  • In vivo studies involving ovariectomized (OVX) C57BL/6 mice treated with phloretin.
  • Analysis of actin podosome formation, vinculin activation, and expression of key signaling molecules.

Main Results:

  • Phloretin inhibited RANKL-induced actin podosome formation and vinculin activation in macrophages.
  • Oral phloretin administration reduced gelsolin and vinculin induction in OVX mice.
  • Phloretin suppressed αvβ3 integrin induction, Pyk2 phosphorylation, c-Src, c-Cbl, paxillin, Syk phosphorylation, and phospholipase Cγ induction.

Conclusions:

  • Phloretin acts as an inhibitor of actin podosomes and sealing zones in osteoclasts.
  • Phloretin disrupts the αvβ3 integrin-c-Src-Pyk2/Syk signaling pathway regulating actin organization.
  • Phloretin demonstrates potential as a therapeutic agent for conditions involving osteoclast dysfunction.

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