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Related Concept Videos

Mesenchymal Stem Cells01:19

Mesenchymal Stem Cells

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Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their...
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Treatment of Osteochondral Defects in the Rabbit's Knee Joint by Implantation of Allogeneic Mesenchymal Stem Cells in Fibrin Clots
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Size-Based Microfluidic-Enriched Mesenchymal Stem Cell Subpopulations Enhance Articular Cartilage Repair.

Zheng Yang1,2,3, Yingnan Wu2,3, Shu Hui Neo1

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|January 8, 2024
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A novel microfluidic device efficiently isolates chondrogenic mesenchymal stem cell (MSC) subpopulations, improving cartilage repair. This method overcomes MSC functional heterogeneity for enhanced cell therapy.

Keywords:
articular cartilagemesenchymal stem cellmicrofluidic device, cell enrichment

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Area of Science:

  • Regenerative Medicine
  • Biotechnology
  • Stem Cell Biology

Background:

  • Functional heterogeneity of culture-expanded mesenchymal stem cells (MSCs) limits their clinical use.
  • Previous research identified MSC subpopulations with superior chondrogenic capacity using spiral microfluidic devices.
  • Inertial cell focusing principle aids in isolating specific MSC subpopulations.

Purpose of the Study:

  • To develop a refined microfluidic method for isolating size-consistent and functionally superior MSC subpopulations.
  • To evaluate the in vitro and in vivo efficacy of microfluidic-enriched chondrogenic MSCs for cartilage repair.
  • To overcome the challenge of MSC functional heterogeneity in cell-based therapies.

Main Methods:

  • A next-generation, automated multidimensional double spiral microfluidic device was designed for size-based MSC isolation.
  • In vitro chondrogenic potential and RNA sequencing were performed on size-sorted MSC subpopulations.
  • In vivo osteochondral repair efficacy was assessed in a rat model using implanted MSC subpopulations and compared to unsegregated MSCs.

Main Results:

  • The multidimensional double spiral device efficiently isolated a chondrogenic MSC subpopulation.
  • RNA sequencing revealed distinct transcriptomic profiles and differential gene expression between subpopulations.
  • Enriched chondrogenic MSCs demonstrated improved cartilage repair, evidenced by histological scoring, mechanical analysis, and micro-computed tomography.

Conclusions:

  • A rapid, label-free microfluidic protocol was established for efficient size-based enrichment of chondrogenic MSCs.
  • The study provides proof-of-concept for enhanced cartilage repair using microfluidic-enriched chondrogenic MSCs.
  • This approach can lead to improved cell therapy products for cartilage repair with better clinical outcomes.