Exploring the in vivo anti-inflammatory actions of simvastatin-loaded porous microspheres on inflamed tenocytes in a collagenase-induced animal model of achilles tendinitis

Chandong Jeong, Sung Eun Kim, Kyu Sik Shim, Hak Jun Kim, Mi Hyun Song, Kyeongsoon Park, Hae Ryong Song

Research output: Contribution to journalArticle

8 Citations (Scopus)


Tendon rupture induces an inflammatory response characterized by release of pro-inflammatory cytokines and impaired tendon performance. This study sought to investigate the therapeutic effects of simvastatin-loaded porous microspheres (SIM/PMSs) on inflamed tenocytes in vitro and collagenase-induced Achilles tendinitis in vivo. The treatment of SIM/PMSs in lipopolysaccharide (LPS)-treated tenocytes reduced the mRNA expressions of pro-inflammatory cytokines (Matrix metalloproteinase-3 (MMP-3), cyclooxygenase-2 (COX-2), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α)). In addition, the local injection of SIM/PMSs into the tendons of collagenase-induced Achilles tendinitis rat models suppressed pro-inflammatory cytokines (MMP-3, COX-2, IL-6, TNF-α, and MMP-13). This local treatment also upregulated anti-inflammatory cytokines (IL-4, IL-10, and IL-13). Furthermore, treatment with SIM/PMSs also improved the alignment of collagen fibrils and effectively prevented collagen disruption in a dose-dependent manner. Therefore, SIM/PMSs treatment resulted in an incremental increase in the collagen content, stiffness, and tensile strength in tendons. This study suggests that SIM/PMSs have great potential for tendon healing and restoration in Achilles tendinitis.

Original languageEnglish
Article number820
JournalInternational Journal of Molecular Sciences
Issue number3
Publication statusPublished - 2018 Mar 12



  • Achilles tendinitis
  • Anti-inflammation
  • Porous microspheres
  • Simvastatin
  • Tendon healing

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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