Modulating in vitro bone cell and macrophage behavior by immobilized enzymatically tailored pectins

Area of Science:

• Biomaterials Science
• Cell Biology
• Biotechnology

Background:

• Previous research demonstrated the potential of pectic polysaccharides for medical device surface modification.
• Rhamnogalacturonan-I (RG-I) is a key component of pectin with potential biological activities.

Purpose of the Study:

• To investigate the effects of engineered RG-I fractions from apple pectin on bone cell and macrophage behavior.
• To evaluate the biocompatibility of medical devices coated with tailored pectin fractions.

Main Methods:

• Surface modification of Thermanox and polystyrene dishes with two distinct modified hairy regions (MHRs) of apple pectin (MHR-alpha and MHR-B).
• Culture of chick embryo bone explants and J774.2 macrophages on the modified surfaces for 14 days.
• Assessment of cell migration, differentiation, proliferation (cell cycle analysis), and cytokine/nitrite secretion.

Main Results:

• MHR-B significantly promoted bone cell migration and differentiation.
• MHR-alpha supported macrophage growth, altering cell cycle progression (G1 to S phase) and reducing pro-inflammatory cytokine and nitrite secretion.
• Macrophages cultured on MHR-B exhibited different responses, with the exception of nitrite secretion.

Conclusions:

• Tailored pectin coatings exhibit distinct in vitro biological activities.
• These modified pectin fractions represent promising candidates for developing innovative medical devices with improved biocompatibility.