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Processing large-diameter poly(L-lactic acid) microfiber mesh/mesenchymal stromal cell constructs via resin

Delfo D'Alessandro1, Gianni Pertici, Stefania Moscato

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Histologic analysis of large poly-L-lactic acid (PLLA) microfiber scaffolds with rat Mesenchymal Stromal Cells (rMSCs) is challenging. This study developed an acrylic resin embedding method for successful histologic analysis of these difficult tissue engineering constructs.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Histology

Background:

  • Polymeric microfiber scaffolds are crucial in tissue engineering.
  • Histologic analysis of large-diameter ( >100 μm) microfiber/cell constructs is difficult due to processing challenges.
  • Standard histologic methods are often insufficient for poly-L-lactic acid (PLLA) microfiber scaffolds.

Purpose of the Study:

  • To develop and validate a histologic analysis protocol for large-diameter PLLA microfiber/rat Mesenchymal Stromal Cell (rMSC) constructs.
  • To overcome limitations of standard histologic processing for difficult-to-section scaffolds.
  • To enable comprehensive investigation of osteogenic differentiation within these constructs.

Main Methods:

  • Utilized dry-wet spinning to create PLLA microfibers (>100 μm).
  • Co-cultured PLLA microfibers with osteogenically differentiated rMSCs.
  • Employed acrylic resin embedding and optimized staining procedures for histologic analysis.
  • Performed biochemical assays to corroborate histologic findings.

Main Results:

  • Successfully embedded and sectioned large-diameter PLLA microfiber/rMSC constructs using acrylic resin.
  • Achieved good penetration of histologic reagents, revealing osteogenic markers and extracellular matrix.
  • Demonstrated expression of alkaline phosphatase, osteopontin, osteocalcin, TGF-β1, Runx2, and Collagen type I.
  • Confirmed presence of amorphous, fibrillar, and mineralized matrix.

Conclusions:

  • A robust histologic protocol using acrylic resin embedding is effective for analyzing large-diameter PLLA microfiber/MSC constructs.
  • This method overcomes standard processing failures, enabling detailed investigation of tissue formation.
  • Facilitates comprehensive evaluation of osteogenic differentiation in challenging scaffold systems for tissue engineering applications.