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Stem cell research aims to find ways to use stem cells to regenerate and repair cellular damage. Over time, most adult cells undergo the wear and tear of aging and lose their ability to divide and repair themselves. Stem cells do not display a particular morphology or function. Adult stem cells, which exist as a small subset of cells in most tissues, keep dividing and can differentiate into a number of specialized cells generally formed by that tissue. These cells enable the body to renew and...
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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.
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Related Experiment Video

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Microfluidic Fabrication of Core-Shell Microcapsules carrying Human Pluripotent Stem Cell Spheroids
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Microencapsulation of Stem Cells for Therapy.

Shirae K Leslie1, Ramsey C Kinney2, Zvi Schwartz1

  • 1School of Engineering, Virginia Commonwealth University, 601 West Main Street, Richmond, VA, 23284-3068, USA.

Methods in Molecular Biology (Clifton, N.J.)
|October 15, 2016
PubMed
Summary

Injectable alginate microbeads effectively encapsulate autologous stem cells, localizing them for tissue regeneration. This method enhances cell viability and therapeutic factor secretion for improved regenerative medicine applications.

Keywords:
AlginateCell-based therapyDegradationHydrogelMicrobeadsMicroencapsulationStem cells

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Cell Therapy

Background:

  • Growing demand for tissue regeneration drives development of autologous stem cell therapies.
  • Adult stem cells offer tissue repair via therapeutic factor production, but localization remains a challenge.
  • Microencapsulation protects cells, localizes them, and facilitates nutrient/waste exchange.

Purpose of the Study:

  • To describe a method for producing injectable stem cell-loaded microbeads.
  • To enable tunable cell numbers within the microencapsulation matrix.
  • To support cell viability and therapeutic factor secretion for tissue regeneration.

Main Methods:

  • Utilized the biopolymer alginate for microencapsulation.
  • Employed a microencapsulator with a syringe pump and electrostatic potential for extrusion.
  • Used a reduced Ca++ cross-linking solution with a nutrient osmolyte to form microbeads.

Main Results:

  • Successfully produced injectable alginate microbeads containing tunable numbers of stem cells.
  • Demonstrated sustained cell viability up to three weeks in vitro and three months in vivo.
  • Confirmed secretion of growth factors supporting tissue regeneration.

Conclusions:

  • Alginate microencapsulation is a viable method for localizing stem cells in regenerative medicine.
  • This technique enhances stem cell survival and function, promoting tissue repair.
  • The developed injectable system offers a promising approach for cell-based therapies.