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Updated: Aug 5, 2026
The Monoiodoacetate Model of Osteoarthritis Pain in the Mouse
Published on: May 16, 2016
Neoagarohexaose Attenuates Inflammatory and Oxidative Joint Injury in MIA/CIOA Mouse Models of Osteoarthritis
Nan Wu1, Yating Du1, Chaocheng Wu1
1Technology Innovation Center for Exploitation of Marine Biological Resources, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China.
Abstract:
Osteoarthritis (OA) is a prevalent chronic joint disease lacking disease-modifying drugs. Animal models with distinct pathogenic mechanisms-monosodium iodoacetate (MIA) for metabolic toxicity and collagenase-induced osteoarthritis (CIOA) for matrix degradation-are essential for therapeutic evaluation. In this study, topical application of neoagarohexaose (NA6) at 5 and 10 mg/kg twice daily was assessed in MIA- and CIOA-induced mouse OA models. NA6 at both doses reduced paw swelling, improved serum oxidative stress markers (catalase (CAT), malondialdehyde (MDA), myeloperoxidase (MPO)), ameliorated cartilage damage and Osteoarthritis Research Society International (OARSI) scores, and decreased inflammatory cell infiltration. Immunohistochemistry showed that NA6 downregulated interleukin-1β (IL-1β) and interleukin-6 (IL-6), upregulated NAD(P)H:quinone oxidoreductase 1 (NQO1), and restored the compensatorily elevated heme oxygenase-1 (HO-1) toward baseline levels. The high-dose NA6 (10 mg/kg) showed comparable or favorable efficacy at the tested doses relative to the positive control diclofenac. These results demonstrate that NA6 exerts anti-inflammatory, antioxidant, and chondroprotective effects in both OA models, supporting its potential as a topical therapeutic candidate for OA symptom management and structural protection.
Insights
Neoagarohexaose (NA6) demonstrates significant anti-inflammatory and antioxidant effects, effectively reducing osteoarthritis symptoms and cartilage damage in mouse models. This compound shows promise for managing osteoarthritis and protecting joint structure.
Area of Science:
- Biomedical research
- Pharmacology
- Orthopedics
Background:
- Osteoarthritis (OA) is a widespread degenerative joint disease with no current disease-modifying treatments.
- Effective therapeutic evaluation relies on animal models like monosodium iodoacetate (MIA) and collagenase-induced osteoarthritis (CIOA) to mimic distinct OA pathologies.
- Developing novel therapeutic agents for OA management is a critical unmet medical need.
Purpose of the Study:
- To investigate the therapeutic potential of topical neoagarohexaose (NA6) in established mouse models of osteoarthritis.
- To assess the anti-inflammatory, antioxidant, and chondroprotective effects of NA6 in both metabolic toxicity (MIA) and matrix degradation (CIOA) OA models.
- To compare the efficacy of NA6 with a positive control, diclofenac.
Main Methods:
- Topical administration of NA6 (5 and 10 mg/kg twice daily) to mice with MIA- or CIOA-induced osteoarthritis.
- Evaluation of paw edema, serum oxidative stress markers (catalase, malondialdehyde, myeloperoxidase), cartilage integrity, and Osteoarthritis Research Society International (OARSI) scores.
- Immunohistochemical analysis to assess the expression of key inflammatory and antioxidant markers, including IL-1β, IL-6, NQO1, and HO-1.
Main Results:
- NA6 treatment significantly reduced paw swelling and inflammatory cell infiltration in both OA models.
- Serum oxidative stress markers (CAT, MDA, MPO) were improved by NA6 administration.
- NA6 ameliorated cartilage damage, improved OARSI scores, downregulated IL-1β and IL-6, upregulated NQO1, and normalized HO-1 levels.
- High-dose NA6 (10 mg/kg) exhibited efficacy comparable or superior to diclofenac.
Conclusions:
- Neoagarohexaose (NA6) demonstrates potent anti-inflammatory, antioxidant, and chondroprotective properties in preclinical OA models.
- NA6 effectively manages OA symptoms and mitigates structural joint damage.
- Topical NA6 presents a promising therapeutic candidate for osteoarthritis management and structural protection.
