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Stem Cell Therapy for Tissue Regeneration01:21

Stem Cell Therapy for Tissue Regeneration

Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
Types of Stem Cells used in Stem Cell Therapy
The two main cell types that...

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Microenvironment-responsive injectable hydrogel for neuro-vascularized bone regeneration.

Wanshun Wang1,2,3, Hu Chen4,5, Jiacong Xiao6,3

  • 1The Second Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China.

Materials Today. Bio
|December 17, 2024
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This study introduces a novel injectable hydrogel that repairs bone by releasing therapeutic agents in response to pH and reactive oxygen species (ROS). The material promotes nerve and blood vessel growth for enhanced bone regeneration.

Keywords:
AngiogenesisBone regenerationInjectable responsive hydrogelNeurogenesisOsteogenesis

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Bone healing is often impaired by inadequate nerve and vascular network regeneration.
  • Current biomaterial designs frequently overlook the reconstruction of these critical networks.
  • The bone injury microenvironment presents challenges for effective healing, including oxidative stress.

Purpose of the Study:

  • To develop a controllable drug delivery system for bone repair using a dual-responsive injectable hydrogel.
  • To address the limitations of current biomaterials by integrating nerve-vascular network reconstruction.
  • To create a material that mimics the bone injury microenvironment for improved therapeutic outcomes.

Main Methods:

  • Fabrication of a pH and reactive oxygen species (ROS) dual-responsive injectable hydrogel (PTHC) by integrating nano-hydroxyapatite (HA) and curculigoside (CCG) into a PVA/TSPBA matrix.
  • Utilizing dynamic borate ester bond covalent crosslinking for hydrogel construction.
  • Evaluating the hydrogel's ability to scavenge ROS, release HA and CCG, alleviate oxidative stress, and promote angiogenesis, neurogenesis, and osteogenesis.

Main Results:

  • The PTHC hydrogel effectively scavenges excessive ROS and responsively releases HA and CCG, establishing a sustained drug delivery system.
  • The hydrogel demonstrated significant biological activities, including promoting angiogenesis, neurogenesis, and osteogenesis.
  • It successfully reconstructed the microvascular network, accelerated sensory nerve repair, and enhanced neuro-vascularized bone regeneration.

Conclusions:

  • The developed multi-bioactive injectable hydrogel system offers a promising therapeutic material for bone repair.
  • This strategy effectively addresses the need for nerve-vascular network reconstruction in bone healing.
  • The dual-responsive hydrogel provides a favorable microenvironment and sustained release for improved bone regeneration outcomes.