Spatial control of cell adhesion and patterning through mussel-inspired surface modification by polydopamine.

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Mammalian cell patterning is crucial for tissue engineering and drug screening.
• Conventional methods often involve complex chemical reactions or protein immobilization.
• Mussel adhesive proteins inspire novel biomaterials for cell adhesion.

Purpose of the Study:

• To develop a universal and simple method for mammalian cell spatial control and patterning.
• To investigate the adhesive and alignment properties of mussel-inspired polydopamine (PDA) for cell patterning.
• To demonstrate the versatility of PDA for cell patterning across different cell lines and materials.

Main Methods:

• Self-polymerization of dopamine to form a polydopamine (PDA) adlayer within poly(dimethylsiloxane) microchannels.
• Continuous injection of aqueous dopamine solution to create PDA-modified regions.
• Culturing various mammalian cell lines (fibrosarcoma HT1080, MC3T3-E1, NIH-3T3) on PDA-patterned surfaces.

Main Results:

• Various mammalian cells predominantly adhered to PDA-modified regions, maintaining normal morphologies.
• Cells exhibited alignment along the direction of striped PDA patterns, irrespective of cell line.
• PDA modification proved effective on various materials without complex chemistry.

Conclusions:

• Mussel-inspired polydopamine offers a simple, versatile, and universal method for mammalian cell patterning.
• The PDA-based approach facilitates cell adhesion and alignment, overcoming limitations of conventional techniques.
• This technique holds significant potential for tissue engineering, drug screening devices, and cell-material interaction studies.