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In vitro adhesion of Staphylococcus epidermidis on heparin-surface-modified intraocular lenses

C R Arciola1, R Caramazza, A Pizzoferrato

  • 1Laboratory for Biocompatibility Research on Implant Materials, Istituti Ortopedici Rizzoli, Bologna, Italy.

Journal of Cataract and Refractive Surgery
|March 1, 1994
PubMed

Insights

Heparin-surface-modified intraocular lenses show reduced Staphylococcus epidermidis adhesion compared to conventional PMMA lenses. This modification may alter bacterial fatty acid structure upon adherence.

Area of Science:

  • Ophthalmology
  • Microbiology
  • Biomaterials Science

Background:

  • Staphylococcus epidermidis is a common cause of opportunistic infections, particularly related to medical devices.
  • Intraocular lenses (IOLs) are susceptible to bacterial adhesion, potentially leading to serious complications like endophthalmitis.
  • Surface modification of IOLs is explored to mitigate bacterial colonization and improve patient outcomes.

Purpose of the Study:

  • To quantitatively assess the in vitro adhesion of Staphylococcus epidermidis to two types of intraocular lenses.
  • To compare bacterial adhesion on conventional poly(methyl methacrylate) (PMMA) IOLs versus heparin-surface-modified PMMA IOLs.
  • To investigate potential alterations in bacterial structural fatty acids following adhesion to IOL surfaces.

Main Methods:

  • Quantitative microbiological turbidimetry was employed to measure the level of Staphylococcus epidermidis adhesion.
  • Gas chromatography was utilized to analyze modifications in the structural fatty acids of adhered bacteria.
  • In vitro adhesion assays were performed on both conventional PMMA and heparin-surface-modified PMMA IOLs.

Main Results:

  • Heparin-surface-modified PMMA IOLs demonstrated significantly lower in vitro adhesion of Staphylococcus epidermidis compared to conventional PMMA IOLs.
  • Analysis of bacterial structural fatty acids revealed distinct modifications in adhered Staphylococcus epidermidis, potentially influenced by the IOL surface type.
  • The findings suggest that surface chemistry plays a crucial role in modulating bacterial-biomaterial interactions.

Conclusions:

  • Heparin surface modification is an effective strategy for reducing Staphylococcus epidermidis adhesion on intraocular lenses.
  • The observed changes in bacterial fatty acid profiles warrant further investigation into the mechanisms of adhesion and potential clinical implications.
  • These results support the development of advanced IOL materials with enhanced resistance to microbial contamination.

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