Advanced materials (Deerfield Beach, Fla.)Aug 19, 2024

Targeted Hydrogel Microspheres Provide Precise Lubrication and Protection for Cartilage Damage

Regenerative Health Weekly Brief ↗PubMed ↗DOI ↗

Updated Apr 6, 2026

Abstract

Injecting targeted hydrogel microspheres (T-G/S HMS) into rats with early osteoarthritis significantly slows disease progression.

Osteoarthritis is characterized by decreased cartilage lubrication, leading to irreversible damage.
Current bio-lubricants do not effectively target small inflammatory lesions in early-stage osteoarthritis.
T-G/S HMS incorporates an antibody that targets cartilage injury sites, enhancing lubrication precision.
The hydrophilicity and dynamic interactions of T-G/S HMS with cartilage injury sites support effective lubrication.
This approach represents a promising technique for treating early-stage osteoarthritis.

Simplified

Osteoarthritis (OA) is a degenerative bone and joint disease characterized by decreased cartilage lubrication, leading to continuous wear and ultimately irreversible damage. This situation is particularly challenging for early-stage OA, as current bio-lubricants lack precise targeting for small inflammatory lesions. In this work, an antibody-mediated targeting hydrogel microspheres (HMS) is developed to precisely lubricate the local injury site of cartilage and prevent the progression of early OA. Anti-Collagen type I (Anti-Col1) is an antibody that targets cartilage injury sites in early OA stages. It is anchored on a HMS matrix made of Gelatin methacrylate (GelMA) and poly (sulfobetaine methacrylate) (PSBMA) to create targeted HMS (T-G/S HMS). The T-G/S HMS's high hydrophilicity, along with the dynamic interaction between its surficial Anti-Col1 and the Col1 on cartilage injury site, ensures its precise and effective lubrication of early OA lesions. Consequently, injecting T-G/S HMS into rats with early OA significantly slows disease progression and reduces symptoms. In conclusion, the developed injectable targeted lubricating HMS and the precisely targeted lubrication strategy represent a promising, convenient technique for treating OA, particularly for slowing the early-stage OA progression.

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Targeted Hydrogel Microspheres Provide Precise Lubrication and Protection for Cartilage Damage

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