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Manipulation of Oxygen Tension in Damaged Regions via Hypoxia-Induced IPN Hydrogel Microspheres for Intervertebral Disc Regeneration

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机构: [1]Shanghai Jiao Tong Univ, Renji Hosp, Sch Med, Dept Spine Surg, 160 Pujian Rd, Shanghai 200127, Peoples R China [2]Shanghai Jiao Tong Univ, Ruijin Hosp, Shanghai Inst Traumatol & Orthopaed, Dept Orthopaed,Sch Med,Shanghai Key Lab Prevent &, 197 Ruijin 2nd Rd, Shanghai 200025, Peoples R China [3]Shanghai Univ, Sch Mat Sci & Engn, Nanchen Rd 333, Shanghai 200444, Peoples R China [4]Shanghai Jiao Tong Univ, Tongren Hosp, Hongqiao Int Inst Med, Ctr Spinal Minimally Invas Res,Sch Med,Dept Orthop, Shanghai 200336, Peoples R China [5]Shanghai Univ, Sch Life Sci, Nanchen Rd 333, Shanghai 200444, Peoples R China
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关键词: cell recruitment hydrogel microspheres microfluidics oxygen tension

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Disruption of low oxygen tension homeostasis during intervertebral disc degeneration inhibits endogenous stem cell viability and function, posing a challenge for endogenous regeneration. Here, to achieve sustained hypoxia manipulation, constructed hypoxia-inducible interpenetrating polymer network (IPN) hydrogel microspheres (HIMS) are constructed by microfluidics to integrate the hypoxic system with a stabilizing network. The IPN is synthesized through a two-step polymerization process, consisting of rapid photo-crosslinked gelatin methacrylate anhydride (GM) polymer I and slow enzyme-crosslinked vanillin-grafted gelatin (GV) polymer II. The enzymatic reaction between GV and laccase is able to create a hypoxic microenvironment to modulate oxygen tension in situ within the injured region. HIMS can reduce microenvironmental oxygen tension by 1/3 and maintain a hypoxic microenvironment for up to 5 days, thereby activating the PI3K/AKT/HIF-1 alpha signaling pathway in endogenous stem cells to promote differentiation into nucleus pulposus-like cells. Additionally, NSC-Exos are loaded onto HIMS to trigger endogenous progenitor/stem cell recruitment and migration. Both in vitro and in vivo assays demonstrate that NSC-Exos@HIMS facilitates stem cell recruitment, targets differentiation, and stimulates extracellular matrix synthesis. Overall, the microspheres established herein provide a novel strategy for manipulating oxygen tension and enhancing endogenous tissue regeneration in injured regions during intervertebral disc degeneration.

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出版当年[2025]版:
大类 | 1 区 综合性期刊
小类 | 1 区 化学:综合 1 区 材料科学:综合 1 区 纳米科技
最新[2025]版:
大类 | 1 区 综合性期刊
小类 | 1 区 化学:综合 1 区 材料科学:综合 1 区 纳米科技
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出版当年[2023]版:
Q1 CHEMISTRY, MULTIDISCIPLINARY Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Q1 NANOSCIENCE & NANOTECHNOLOGY
最新[2023]版:
Q1 CHEMISTRY, MULTIDISCIPLINARY Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Q1 NANOSCIENCE & NANOTECHNOLOGY

影响因子: 最新[2023版] 最新五年平均 出版当年[2023版] 出版当年五年平均 出版前一年[2022版]

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第一作者机构: [1]Shanghai Jiao Tong Univ, Renji Hosp, Sch Med, Dept Spine Surg, 160 Pujian Rd, Shanghai 200127, Peoples R China [2]Shanghai Jiao Tong Univ, Ruijin Hosp, Shanghai Inst Traumatol & Orthopaed, Dept Orthopaed,Sch Med,Shanghai Key Lab Prevent &, 197 Ruijin 2nd Rd, Shanghai 200025, Peoples R China [3]Shanghai Univ, Sch Mat Sci & Engn, Nanchen Rd 333, Shanghai 200444, Peoples R China
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