Effects of type II collagen hydrolysates on osteoarthritis through the NF-κB, Wnt/β-catenin and MAPK pathways

Area of Science:

• Biochemistry
• Orthopedics
• Nutraceuticals

Background:

• Osteoarthritis (OA) is a prevalent degenerative joint disease demanding effective therapeutic strategies.
• Current treatments often focus on symptom management rather than disease modification.

Purpose of the Study:

• To investigate the chondroprotective effects of bovine cartilage hydrolysates rich in type II collagen peptides (BIIP).
• To elucidate the molecular mechanisms underlying BIIP's action in an OA rat model.

Main Methods:

• Establishment of a rat model of osteoarthritis via medial meniscus resection (MMx) and anterior cruciate ligament (ACL) transection.
• Histological analysis to assess cartilage degeneration.
• Proteomic analysis to identify BIIP targets.
• mRNA and protein expression analysis of key signaling pathways (NF-κB, Wnt/β-catenin, MAPK).

Main Results:

• Oral administration of BIIP (200 and 500 mg kg^-1 d^-1) significantly ameliorated cartilage degeneration.
• BIIP downregulated the expression of pro-inflammatory and OA-related molecules including IL-6, RUNX2, NF-κB p65, HIF-2α, β-catenin, and p-JNK.
• Proteomic and pathway analyses identified key molecular targets modulated by BIIP.

Conclusions:

• BIIP demonstrates significant chondroprotective effects in an experimental OA model.
• BIIP's mechanism involves the modulation of critical signaling pathways, suggesting its potential as a functional food ingredient for osteoarthritis prevention.