Human tears inhibit the coating of proteins to solid phase surfaces

Area of Science:

• Ophthalmology
• Biochemistry
• Immunology

Background:

• Surfactants play a crucial role in tear film stability.
• Understanding tear composition is vital for diagnosing and managing dry eye disease and other tear film disorders.

Purpose of the Study:

• To investigate the presence and characteristics of surfactants in human tear samples.
• To develop a sensitive method for analyzing tear surfactant activity.

Main Methods:

• Enzyme-Linked Immunosorbent Assay (ELISA) technology was adapted to study tear samples.
• Experiments involved incubating tear samples with polyacrylate microcuvettes and purified lactoferrin.
• The effect of tear fractions on antibody binding was assessed to characterize inhibitory activity.

Main Results:

• Human tears demonstrated a dose-dependent inhibition of lactoferrin binding to microcuvettes.
• A "coating inhibitory activity" was identified in tears, attributed to a factor binding to the solid phase.
• The findings suggest the presence of lacrimal surfactants similar to those previously observed.

Conclusions:

• A novel ELISA-based method can quantify tear surfactant activity using minimal tear samples.
• This method is suitable for biochemical analysis and clinical studies of tear film disorders.