Related Experiment Video
Updated: Aug 17, 2026
A Pre-Clinical Model of Synovitis Using Ex vivo Human Synovial Tissue with Preserved Function and Architecture
Published on: March 20, 2026
Treatment for HTLV-I associated arthropathy: a case study and synovial tissue culture analysis
Toshiaki Takahashi1, Shigeki Takemoto, Katsuhito Kiyasu
1Department of Orthopaedics, Kochi Medical School, Kochi University, Nankoku, Kochi 783-8505, Japan. takahast@m.ehime-u.ac.jp
Objective:
There are few reports regarding the treatment of HTLV-I associated arthropathy (HAAP). This is a case study describing the treatment of a patient diagnosed with HAAP. We also analyzed the effects of various agents on cultured synovial tissue explants from the patient.
Methods:
Arthroscopic synovectomy of the left knee was performed. We investigated the effects of pirarubicin (THP), bestatin, betamethasone, and hyaluronic acid (HA) in synovial tissue culture to evaluate the efficacy of these medications.
Results:
Swelling and pain of the left knee was transiently diminished after synovectomy. However, bilateral swelling of the knees and C reactive protein (CRP) concentrations were increased. In the explant culture experiments, CD8+ cells decreased with the addition of bestatin, betamethasone, and HA. The structure of synovial cells was preserved by the addition of HA. However, the addition of THP induced fibrosis of synovial tissues, increased cells without nuclei, and diminished fascin-expressing cells.
Conclusion:
THP inhibited, but HA preserved the structure of hypertrophic synovial cells. Scopic synovectomy effectively improved joint effusion and pain; however, the effect was transient, and additional treatment with predonisolone was required. Therefore, it is important to develop a more effective treatment for HAAP.