Functionalized Carbon Nanowalls as Pro-Angiogenic Scaffolds for Endothelial Cell Activation

Area of Science:

• Biomaterials Engineering
• Cell Biology
• Surface Science

Background:

• In vitro cell culture requires substrates mimicking in vivo conditions for accurate biological studies.
• Developing advanced materials is crucial for improving cell attachment, proliferation, and function in cell culture.

Purpose of the Study:

• To investigate the efficacy of functionalized carbon nanowalls (CNW) as a substrate for human endothelial cell culture.
• To evaluate the impact of nitrogen (N2) functionalization on CNW properties and cell behavior.
• To explore the potential of CNW-N2 substrates in promoting angiogenesis-related factors.

Main Methods:

• Carbon nanowall (CNW) films were synthesized on silicon substrates using surface-wave microwave plasma-enhanced chemical vapor deposition (SWMWPECVD).
• CNW films were functionalized with nitrogen gas plasma to create N2-doped CNW (CNW-N2).
• Characterization included morphology and thickness analysis; cell attachment, proliferation, cytoskeletal protein expression, and pro-angiogenic factor secretion were assessed.

Main Results:

• CNW films exhibited a uniform petal-like morphology with nanoscale widths and micrometer-scale thickness.
• N2-functionalized CNWs significantly enhanced human endothelial cell attachment and proliferation.
• Cells cultured on CNW-N2 showed increased expression of major cytoskeletal proteins, indicating maintained structural integrity.
• For the first time, CNW-N2 substrates were observed to promote pro-angiogenic factors in endothelial cells.

Conclusions:

• Functionalized carbon nanowalls provide a promising substrate for in vitro cell culture, particularly for endothelial cells.
• Nitrogen doping of CNWs enhances cell adhesion, proliferation, and structural integrity.
• The observed promotion of pro-angiogenic factors suggests potential applications in angiogenesis research and biomedical engineering.