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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Polypropylene is a common material for surgical implants.
  • Host tissue response to implanted materials can lead to complications.
  • Mesenchymal stromal cells (MSCs) show potential for modulating tissue response.

Purpose of the Study:

  • To investigate the effect of adsorbing bone marrow-derived mesenchymal multipotent stromal cells (MMSCs) onto polypropylene materials on the subcutaneous tissue response in rats.
  • To evaluate the long-term biocompatibility and degradation of polypropylene implants with and without adsorbed MMSCs.

Main Methods:

  • Light microscopy was used to examine rat subcutaneous tissue after implantation of polypropylene materials.
  • Materials included monofilament threads and mesh products, with and without pre-adsorbed MMSCs.
  • Histological analysis focused on inflammation, capsule formation, material degradation, and cellular infiltration at various time points (up to 1 year).

Main Results:

  • Implantation of polypropylene caused mild inflammation, encapsulation by fibrous connective tissue, and multinucleated macrophages.
  • Over time, polypropylene threads deformed and fragmented, with surrounding capsules.
  • Preliminary adsorption of MMSCs transiently reduced capsule thickness, increased vascularization, and decreased inflammatory infiltration, with effects disappearing within 1 week.

Conclusions:

  • While MMSCs show transient benefits in reducing foreign body response to polypropylene, their effect is short-lived.
  • Polypropylene implants undergo degradation and fragmentation, potentially leading to chronic foreign material presence.
  • Further strategies are needed to achieve sustained modulation of the host response to biomaterials.