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The miR-548d-5p/SP1 signaling axis regulates chondrocyte proliferation and inflammatory responses in osteoarthritis

Yusheng Li1, Wenqing Xie2, Yizi Zheng3

  • 1Department of Orthopedics, Xiangya Hospital, Central South University, Changsha 410008, Hunan, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha 410008, Hunan, China.

International Immunopharmacology
|August 18, 2022
PubMed

Insights

MicroRNA-548d-5p is downregulated in osteoarthritis (OA). Restoring miR-548d-5p levels protects against OA by inhibiting the protein SP1, reducing chondrocyte damage and inflammation.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Orthopedics

Background:

  • Osteoarthritis (OA) involves chondrocyte apoptosis and dysfunction.
  • Non-coding RNAs, including microRNAs, are implicated in OA pathogenesis.
  • MicroRNA-548d-5p (miR-548d-5p) role in OA requires further elucidation.

Purpose of the Study:

  • Investigate the role of miR-548d-5p in osteoarthritis.
  • Determine the mechanism by which miR-548d-5p affects chondrocytes.
  • Evaluate miR-548d-5p as a potential therapeutic target for OA.

Main Methods:

  • Analysis of miR-548d-5p expression in OA patient samples and IL-1β-stimulated chondrocytes.
  • In vitro experiments overexpressing miR-548d-5p in chondrocytes.
  • In vivo study using a rat model of OA induced by papain.
  • Identification of SP1 as a direct downstream target of miR-548d-5p.

Main Results:

  • miR-548d-5p was significantly downregulated in OA samples and IL-1β-treated chondrocytes.
  • Overexpression of miR-548d-5p protected chondrocytes from IL-1β-induced damage, reducing apoptosis and inflammation, and improving extracellular matrix deposition.
  • miR-548d-5p overexpression ameliorated cartilage damage in an OA rat model.
  • Specificity protein 1 (SP1) was confirmed as a direct target, and its overexpression counteracted the protective effects of miR-548d-5p.

Conclusions:

  • miR-548d-5p is abnormally downregulated in osteoarthritis.
  • miR-548d-5p exerts protective effects against IL-1β-induced chondrocyte damage.
  • The protective mechanism involves the direct inhibition of SP1 by miR-548d-5p.
Keywords:
ChondrocyteMicroRNA-548d-5pOsteoarthritisSpecificity protein 1

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