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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Schicht, Martin Bräuer, Lars Millar, Thomas J. Palaniappan, Chendur K. Schütt, Burkhardt S. |
| Description | Country affiliation: Australia Author Affiliation: Palaniappan CK ( School of Science and Health, University of Western Sydney, New South Wales, Australia.) |
| Abstract | PURPOSE: In vitro studies indicate that surface tension and surface viscosity of the tear film lipid layer (TFLL) are governed by interactions between meibomian lipids and proteins from the aqueous layer. The role of minor tear proteins with strong lipophilic properties or those correlated with pathological states is still unknown. The discovery of lung surfactant proteins (SPs) in tears and keratin in normal and abnormal meibomian gland excretions warrants investigation into their effects on the surface activity of meibomian lipid films. METHODS: Commercial keratin and bovine lung SPs were used in vitro to assess the surface pressure of meibomian lipid films using a Langmuir trough. RESULTS: The pressure-area profiles of meibomian lipid films seeded with SPs (2.5 µL; 0.1 µg) demonstrated hybrid characteristics between meibomian lipid films alone and SPs alone but reached much higher maximum surface pressures (approximately 30 vs. 24 mN/m). Microscopically, the appearance of meibomian lipid films was not altered by SPs. Maximum surface pressure of meibomian films premixed with keratin was much higher than meibum alone. The pressure-area isocycles appeared more like those of meibomian lipids with a low concentration of protein and more like pure keratin films at a high concentration. CONCLUSIONS: The data strongly indicate that SPs and keratin likely interact with the TFLL. SPs are likely to act as strong surfactants and to reduce the surface tension of the lipid layer. Excess concentrations of keratin as identified in patients with meibomian gland dysfunction could disrupt the normal structure of the meibomian lipid film. |
| ISSN | 01460404 |
| e-ISSN | 15525783 |
| Journal | Investigative Opthalmology & Visual Science |
| Issue Number | 4 |
| Volume Number | 54 |
| Language | English |
| Publisher | Association for Research in Vision and Ophthalmology |
| Publisher Date | 2013-04-09 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Keratins Pharmacology Lipids Meibomian Glands Chemistry Pulmonary Surfactant-associated Proteins Animals Drug Effects Pulmonary Surfactants Surface Properties Surface Tension Comparative Study Research Support, Non-u.s. Gov't Discipline Ophthalmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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