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Metabolism Balance Regulation via Antagonist‐Functionalized Injectable Microsphere for Nucleus Pulposus Regeneration
Author(s) -
Xu Yichang,
Gu Yong,
Cai Feng,
Xi Kun,
Xin Tianwen,
Tang Jincheng,
Wu Liang,
Wang Zhen,
Wang Fei,
Deng Lianfu,
Pereira Catarina Leite,
Sarmento Bruno,
Cui Wenguo,
Chen Liang
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202006333
Subject(s) - extracellular matrix , antagonist , biophysics , materials science , receptor antagonist , tumor necrosis factor alpha , extracellular , inflammation , receptor , chemistry , biochemistry , medicine , biology
Antagonist therapy represents a potential treatment for extracellular matrix (ECM) metabolic imbalance via the specific binding of inflammatory factors resulting from inflammation. However, the short half‐life of antagonist bioactivity creates challenges for their clinical application. Herein, bovine serum albumin nanoparticles (BNP) encapsulating recombinant human soluble tumor necrosis factor (TNF) receptor type II (rhsTNFRII) are grafted onto microfluidic poly( l ‐lactic acid) (PLLA) porous microspheres through chemical bonds, constructing antagonist‐functionalized injectable porous microspheres (MS‐BNP) for in situ injection into the nucleus pulposus (NP), aimed at regulating the metabolic balance of ECM, thus inhibiting intervertebral disc degeneration. Several binding sites within the BNPs improve encapsulation efficiency, promote the sustained release of rhsTNFRII, and regulate ECM metabolism in the NP. Moreover, PLLA porous microspheres display excellent injectability and porosity and demonstrate efficient and uniform loading of nanoparticles through chemical grafting. By delivering MS‐BNP into the NP, a suitable environment is created in situ. Immunohistochemical analysis at 4 and 8 weeks shows that compared with other experimental groups, the expression of TNF‐α is significantly inhibited for 6.11–15.65 folds and 4.59–22.14 folds, respectively, and a significant regeneration in NP occurred. This work proposes a novel porous microsphere therapy functionalized by antagonist molecules for the treatment of ECM metabolic disorders, caused by chronic inflammatory responses.