Kat7 accelerates osteoarthritis disease progression through the TLR4/NF-κB signaling pathway

Area of Science:

• Biochemistry
• Molecular Biology
• Orthopedics

Background:

• Osteoarthritis (OA) is a prevalent degenerative joint disease with incompletely understood mechanisms.
• Current treatments for OA lack clinical efficacy, highlighting the need for novel therapeutic targets.

Purpose of the Study:

• To investigate the role of histone acetyltransferase Kat7 in osteoarthritis pathogenesis.
• To explore Kat7 as a potential therapeutic target for osteoarthritis treatment.

Main Methods:

• Assessed Kat7 expression in human OA cartilage and a mouse OA model.
• Utilized chondrocyte-specific knockdown of Kat7 in vitro and in vivo.
• Investigated the effect of Kat7 on chondrocyte function, cartilage metabolism, and OA progression.
• Examined the involvement of the TLR4/NF-κB signaling pathway.

Main Results:

• Kat7 expression was elevated in OA cartilage and induced by joint instability.
• Chondrocyte-specific Kat7 knockdown protected articular cartilage integrity.
• Kat7 promoted cartilage catabolism, chondrocyte senescence, and apoptosis.
• Silencing Kat7 enhanced cartilage anabolism, prevented damage, and slowed OA progression in vivo.
• Kat7 activated the TLR4/NF-κB pathway, which mediated its catabolic effects.

Conclusions:

• Kat7 plays a critical role in osteoarthritis development and progression.
• Targeting Kat7, potentially through inhibition of the TLR4/NF-κB pathway, offers a promising therapeutic strategy for osteoarthritis.