Chondrocyte behavior on nanostructured micropillar polypropylene and polystyrene surfaces.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Cell Biology

Background:

• Chondrocytes are crucial for maintaining cartilage health and function.
• Cell culture substrates can influence chondrocyte behavior, including extracellular matrix (ECM) production and phenotype.
• Nanostructured surfaces offer potential for improved cell adhesion and function compared to smooth surfaces.

Purpose of the Study:

• To investigate the effect of patterned polypropylene (PP) and polystyrene (PS) substrates on chondrocyte ECM production.
• To evaluate the ability of patterned PP and PS to maintain chondrocyte phenotype during culture.
• To compare cell adhesion, morphology, and gene expression on smooth versus patterned PP and PS surfaces.

Main Methods:

• Bovine primary chondrocytes were cultured on smooth and nanostructured (micropillar) PP and PS surfaces for two weeks.
• Cell viability, collagen synthesis (types I and II), cell morphology, and gene expression (Sox9, aggrecan, procollagens) were assessed.
• Quantitative RT-PCR was used to analyze gene expression levels.

Main Results:

• Chondrocytes adhered well to patterned PP and PS, with limited adhesion on smooth PP but good adhesion on smooth PS.
• Cells on patterned PP and PS synthesized types I and II collagen, exhibited extended morphology, and formed an ECM network.
• While aggrecan expression was highest on patterned PS in passage 1, neither patterned surface prevented chondrocyte dedifferentiation upon passaging.

Conclusions:

• Patterned polypropylene and polystyrene surfaces support bovine chondrocyte attachment and ECM production.
• These patterned substrates facilitate the formation of an extracellular matrix network around adhered chondrocytes.
• Neither patterned PP nor PS effectively prevented chondrocyte dedifferentiation in vitro.