ArticleJournal of materials science. Materials in medicine2026
Photosensitive and extracellular matrix-mimicking hydrogels promote the tendon-bone healing in rotator cuff injury.
Article in Journal of materials science. Materials in medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The healing of the tendon-bone interface remains a significant challenge due to the lack of suitable bioactive materials for promoting interface regeneration. To address this, we developed a photosensitive hydrogel system designed to mimic the extracellular matrix. This system is based on light-induced imine crosslinking between type I collagen (Col I) and o-nitrobenzyl alcohol (NB)-modified hyaluronic acid (HANB). Experimental results demonstrate that the hydrogel (Col I-HANB) exhibits excellent controllability, low swelling rate, biodegradability, and tissue-adhesive properties. Using a fluorescent dye (8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt, HPTS) as a model molecule, we confirmed that the hydrogel enables localized and sustained release, high-lighting its potential as a drug-delivery platform for tissue engineering. To further enhance tendon-bone interface repair, the hydrogel was functionalized with two key components: (I) The E7 peptide, known for its stem cell-homing properties, was covalently immobilized into the hydrogel network via conjugation to bovine serum albumin (BSA) and followed by imine-ligation between UV-triggered aldehyde generation from HANB and BSA's amino groups; and (II) Kartogenin (KGN)-loaded nanoparticles (KGN-NPs) were incorporated to potentially promote chondrogenic differentiation, with release assays confirming sustained KGN delivery over 21 days. The composite hydrogel demonstrated excellent biocompatibility in cytotoxicity and live/dead assays. Importantly, in a rabbit rotator cuff tear model, it effectively promoted fibrocartilage regeneration and significantly improved tendon-bone healing, creating a favorable microenvironment for repair. The results above indicate that the hydrogel system provides a good microenvironment for rotator cuff injury repair and is a promising scaffold applied in treatment of rotator cuff injury.
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