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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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Light-Induced Dielectrophoresis for Characterizing the Electrical Behavior of Human Mesenchymal Stem Cells
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Interaction between immobilized polyelectrolyte complex nanoparticles and human mesenchymal stromal cells.

Beatrice Woltmann1, Bernhard Torger2, Martin Müller2

  • 1Dresden University of Technology, Faculty of Medicine Carl Gustav Carus, Institute of Physiological Chemistry, Dresden, Germany.

International Journal of Nanomedicine
|May 24, 2014
PubMed
Summary

Poly-electrolyte complex nanoparticles (PECNPs) show potential for bone regeneration. The PEI/CS nanoparticle system demonstrated excellent biocompatibility, making it suitable for drug delivery to enhance bone healing in patients with bone diseases.

Keywords:
MTS assaybiocompatibilitymesenchymal stromal cellsmorphologypolyelectrolyte complex nanoparticles

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Regenerative Medicine

Background:

  • Implant loosening and poor osseointegration are significant challenges in patients with systemic bone diseases like osteoporosis.
  • Local, sustained drug delivery at the bone/implant interface can stimulate cell formation for stable bone integration.
  • Investigating polymer-based nanoparticles' interaction with bone cells is crucial for developing effective bone regeneration strategies.

Purpose of the Study:

  • To explore the interaction between polymer-based nanoparticles and human bone marrow-derived cells.
  • To evaluate the influence of nanoparticle composition and surface charge on cellular response.
  • To identify suitable nanoparticle systems for local drug delivery in bone regeneration.

Main Methods:

  • Polyelectrolyte complex nanoparticles (PECNPs) were synthesized using various polycations (PEI, PLL, DEAE) and polyanions (DS, CS).
  • Physicochemical properties, including size and net charge, were characterized.
  • Biocompatibility was assessed using human mesenchymal stromal cells (hMSCs) via metabolic activity assays and microscopy.

Main Results:

  • PECNPs of ~50-150 nm were prepared with tunable surface charges (positive or negative).
  • Nanoparticle composition significantly impacted hMSC morphology and metabolic activity, while net charge had minimal effect.
  • The PEI/CS system exhibited dose-dependent biocompatibility, with nanoparticles internalized and stable within hMSCs for up to 8 days.

Conclusions:

  • The composition of PECNPs critically influences human mesenchymal stromal cell behavior.
  • The PEI/CS nanoparticle system demonstrated broad biocompatibility and is a promising candidate for local drug delivery applications.
  • PECNP-functionalized bone substitutes hold potential for improving bone integration and treating bone diseases.