Array of amorphous calcium phosphate particles improves cellular activity on a hydrophobic surface

Area of Science:

• Biomaterials Science
• Cell Biology
• Surface Chemistry

Background:

• Hydrophobic surfaces exhibit poor cell interaction, leading to delayed proliferation and increased apoptosis due to insufficient cell adhesion signaling.
• Enhancing cell adhesion is crucial for developing effective biomaterials and tissue engineering scaffolds.

Purpose of the Study:

• To fabricate a hydrophilic array of amorphous calcium phosphate (ACP) on a hydrophobic surface to improve cell adhesion and function.
• To evaluate the biocompatibility and cellular response of osteoblastic cells cultured on the ACP array.

Main Methods:

• An array of amorphous calcium phosphate (ACP) nanoparticles was synthesized and adhered to a hydrophobic polystyrene surface via controlled heating of calcium ion solutions.
• The size and density of ACP particles were modulated by adjusting ion concentration and treatment cycles.
• Osteoblastic MC3T3-E1 cells were cultured on the ACP array, and their adhesion, proliferation, apoptosis, spreading, and differentiation were assessed in vitro.

Main Results:

• The ACP array significantly improved osteoblastic cell adhesion, spreading, and the formation of stress fibers and focal contacts compared to untreated hydrophobic surfaces.
• Cells cultured on the ACP array exhibited reduced apoptosis and enhanced proliferation rates.
• The ACP array promoted the expression of osteoblast differentiation markers.

Conclusions:

• An array of amorphous calcium phosphate (ACP) serves as an effective coating material for enhancing the biocompatibility of hydrophobic surfaces.
• ACP arrays offer a promising alternative to organic molecule modification for improving cell-material interactions in tissue engineering and biomaterials.
• This approach facilitates better cellular responses, including adhesion, proliferation, and differentiation, essential for regenerative medicine applications.