Staphylococcus aureus Behavior on Artificial Surfaces Mimicking Bone Environment.

Area of Science:

• Biomaterials Science
• Infectious Diseases
• Orthopedic Surgery

Background:

• Infections pose a significant challenge to bone regeneration, particularly with biomaterials that may promote bacterial adhesion.
• Calcium phosphate (CaP) and collagen are common substrates for bone regeneration scaffolds but can support Staphylococcus aureus (S. aureus) adhesion.
• S. aureus can form biofilms, which are highly resistant to antibiotics and immune responses, complicating treatment.

Purpose of the Study:

• To compare the adhesion of three S. aureus strains on CaP- and collagen-coated surfaces.
• To evaluate the potential of these bone-mimicking coatings for developing in vitro infection models.
• To assess the risk of bacterial colonization and biofilm development on bone substitute materials.

Main Methods:

• Three S. aureus strains (CIP 53.154, SH1000, USA300) were tested for adhesion on CaP- and collagen-coated surfaces.
• Bacterial adhesion and matrix component formation were quantified.
• Biofilm gene expression was analyzed.
• CaP, collagen, and titanium-mimicking surfaces were simultaneously tested in vitro.

Main Results:

• All three S. aureus strains adhered to both CaP and collagen coatings.
• More visible matrix components were observed on CaP coatings compared to collagen.
• No significant differences in biofilm gene expression were found between CaP and collagen surfaces.
• Simultaneous testing of multiple surfaces did not yield significantly different adhesion results compared to independent testing.

Conclusions:

• CaP and collagen coatings, used as bone substitutes, are susceptible to bacterial colonization, particularly CaP.
• These materials require integration with antimicrobial strategies to prevent biofilm formation.
• The findings highlight the need for careful material selection and infection control in bone regeneration therapies.