Related Experiment Video
Updated: Aug 8, 2026
Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity
Published on: November 8, 2016
CD81 inhibition with the cytoplasmic RNA vector producing anti-CD81 antibodies suppresses arthritis in a rat CIA
Yuta Fujii1, Yuji Arai2, Shuji Nakagawa2
1Department of Orthopaedics, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Objective:
Cluster of differentiation 81 (CD81) is a tetraspanin membrane protein consisting of 4 transmembrane domains and 2 outer membrane loops. CD81 inhibition is a potential treatment for rheumatoid arthritis (RA). Here, we investigated the therapeutic effects of the cytoplasmic RNA vector expressing anti-CD81 antibodies (the anti-CD81 vector) on the ankle joint synovium in collagen-induced arthritis (CIA) rats.
Methods:
Body weight, paw volume, and clinical scores were measured on days 0, 7, and 10 and daily thereafter. On day 28, the ankle joints of the rats were removed and stained with haematoxylin, eosin, and Safranin O. Arthritic changes such as inflammatory cell infiltration, synovial proliferation, articular cartilage destruction, and bone erosion were evaluated by histological scoring.
Results:
Symptom onset was delayed in the right lower limbs of the rats administered the cytoplasmic RNA vector (CIA + anti-CD81) compared with that in the control group (CIA + control). The CIA + anti-CD81 rats were heavier than the CIA + control rats. The paw volume and clinical scores were significantly lower in the CIA + anti-CD81 than in the CIA + control. The histological scores indicated significantly milder manifestations of RA in the CIA + anti-CD81 than in the CIA + control.
Conclusions:
Administration of the cytoplasmic RNA vector expressing anti-CD81 antibodies suppressed arthritis and joint destruction in CIA rats. Our findings suggest that the cytoplasmic RNA vector can be used to treat RA.
Insights
A novel cytoplasmic RNA vector targeting CD81 (Cluster of Differentiation 81) effectively suppressed arthritis and joint damage in collagen-induced arthritis (CIA) rats, suggesting a potential new treatment for rheumatoid arthritis (RA).
Area of Science:
- Immunology
- Rheumatology
- Molecular Biology
Background:
- Cluster of differentiation 81 (CD81) is a tetraspanin protein implicated in immune responses.
- CD81 inhibition presents a potential therapeutic strategy for rheumatoid arthritis (RA).
Purpose of the Study:
- To investigate the therapeutic efficacy of a cytoplasmic RNA vector expressing anti-CD81 antibodies in a rat model of collagen-induced arthritis (CIA).
Main Methods:
- Rats with CIA were administered the anti-CD81 RNA vector.
- Clinical parameters including body weight, paw volume, and disease scores were monitored.
- Ankle joints were analyzed histologically on day 28 to assess arthritic changes.
Main Results:
- The anti-CD81 vector delayed symptom onset and improved clinical scores in CIA rats.
- Histological analysis revealed significantly reduced inflammation, synovial proliferation, cartilage destruction, and bone erosion compared to controls.
- CIA rats treated with the anti-CD81 vector exhibited better body weight and reduced paw volume.
Conclusions:
- The cytoplasmic RNA vector expressing anti-CD81 antibodies demonstrates significant therapeutic effects in suppressing arthritis and joint destruction in CIA rats.
- These findings support the potential of this vector as a novel treatment modality for rheumatoid arthritis.
