Cell attachment and long-term growth on derivatizable polyacrylamide surfaces

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Cellular functions like adhesion, growth, motility, and differentiation are influenced by cell surface signals.
• The precise molecular mechanisms governing cell surface control of these behaviors remain largely unelucidated.

Purpose of the Study:

• To develop versatile synthetic surfaces for probing the role of extracellular molecules in cell function.
• To create platforms supporting long-term cell growth that can be easily modified with biologically relevant molecules.

Main Methods:

• Preparation of polyacrylamide gels with a gradient of active ester groups.
• Derivatization of gels by displacing esters with ligands to create gradients of carboxylic acid, tertiary amine, or hydroxyl groups.
• Seeding of untransformed mouse fibroblasts (BALB/3T3) to assess attachment, growth, and morphology on different surfaces.

Main Results:

• Fibroblast attachment and growth were observed only on surfaces derivatized with carboxylic acid or hydroxyl groups within specific concentration ranges.
• Optimal growth on carboxylic acid-derivatized gels (approx. 30 μmol/ml) was comparable to tissue culture plastic; hydroxyl-derivatized gels supported less extensive growth.
• Short-term adhesion (90 min) was higher on hydroxyl- than carboxylic acid-derivatized gels, and both short-term adhesion and long-term growth required serum.

Conclusions:

• Synthetic polyacrylamide gels can be effectively derivatized to control cell adhesion and long-term growth.
• The developed technique allows for systematic variation of substratum functional groups and concentrations, applicable to various cell types.
• This approach provides a valuable tool for investigating the molecular mechanisms of cell surface-mediated behaviors.