Replication of a Tissue Microenvironment by Thermal Scanning Probe Lithography

Area of Science:

• Nanotechnology
• Biomaterials Science
• Cell Biology

Background:

• Thermal scanning probe lithography (t-SPL) offers efficient nanofabrication without complex procedures.
• Polyphthalaldehyde (PPA) is a thermolabile resist suitable for t-SPL applications.
• Developing biocompatible substrates with controlled nanotopography is crucial for cell culture studies.

Purpose of the Study:

• To establish polyphthalaldehyde (PPA)-coated surfaces as direct cell culture substrates.
• To demonstrate the use of t-SPL for rapid prototyping of nanotopographical cell culture surfaces.
• To investigate the biocompatibility and cell response to t-SPL generated nanotopographies.

Main Methods:

• Coating silicon wafers with allylamine and PPA to create stable cell culture surfaces.
• Utilizing t-SPL to replicate native tissue nanotopography onto PPA-coated substrates.
• Culturing human mesenchymal stem cells (MSCs) on PPA surfaces and t-SPL generated nanotopographies.
• Analyzing cell adhesion, spreading, proliferation, morphology, and focal adhesion formation.

Main Results:

• PPA surfaces demonstrated biocompatibility, supporting MSC adhesion, spreading, and proliferation comparable to glass.
• Allylamine coating stabilized PPA immobilization in aqueous solutions.
• t-SPL successfully replicated bovine tendon nanotopography onto PPA substrates.
• MSCs cultured on t-SPL substrates exhibited similar morphological changes and focal adhesion patterns as those on native tendon.

Conclusions:

• t-SPL is a viable method for rapidly creating complex, spatially accurate nanotopographical cell culture substrates.
• PPA-coated surfaces are biocompatible and suitable for direct cell culture and nanofabrication.
• This technique accelerates the development of models for studying cell-matrix interactions and tissue engineering.