A novel PAI-1 inhibitor prevents ageing-related muscle fiber atrophy

Aidehamu Aihemaiti, Naoki Yamamoto, Jinying Piao, Takuya Oyaizu, Hiroki Ochi, Shingo Sato, Atsushi Okawa, Toshio Miyata, Kunikazu Tsuji, Yoichi Ezura, Yoshinori Asou

Research output: Contribution to journalArticlepeer-review


Sarcopenia is among the most common medical problems of the aging population worldwide and a major social concern. Here, we explored the therapeutic potential of TM5484, a novel orally available PAI-1 inhibitor, to prevent sarcopenia. The sarcopenic phenotypes of the calf muscle of 12- and 6-month-old middle-aged mice were compared. Although significant decline of isometric gastrocnemius muscle force was detected in the older untreated mice, those administered TM5484 had significantly greater calf muscle force, as determined using isometric measurements by electrical stimulation. Histological analysis indicated that cross-sectional gastrocnemius muscle fibers in untreated older mice were thinner than those in younger mice; however, TM5484-treated group showed thicker fibers than younger mice. Treatment with TM5484 for 6 months enhanced Igf1, Atrogin-1, Mt-Co1, and Chrna1 mRNA expression in the mice gastrocnemius muscle, with increased serum IGF-1 concentration. TM5484 induced dose-dependent Igf1, Atrogin-1, and Chrna1 expression in C2C12 myoblastic cells, confirming cell autonomous effect. Further, the presence of plasmin for 72 h caused significantly increased Igf1 expression in C2C12 cells. These findings suggest that oral PAI-1 inhibitors represent a promising therapeutic candidate for preventing sarcopenia progression in humans.

Original languageEnglish
Pages (from-to)849-856
Number of pages8
JournalBiochemical and biophysical research communications
Publication statusPublished - 2021 Jan 1


  • Igf1
  • PAI-1 inhibitor
  • Sarcopenia
  • TM5484

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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