Abstract：
:Tear stability decreases with increasing age and the same signs of instability are exacerbated with dry eye. Meibum lipid compositional changes with age provide insights into the biomolecules responsible for tear film instability. Meibum was collected from 69 normal donors ranging in age from 0.6 to 68 years of age. Infrared spectroscopy was used to measure meibum lipid phase transition parameters. Nuclear magnetic resonance spectroscopy was used to measure lipid saturation. Increasing human meibum lipid hydrocarbon chain unsaturation with age was related to a decrease in hydrocarbon chain order, cooperativity, and in the phase transition temperature. The change in these parameters was most dramatic between 1 and 20 years of age. Meibum was catalytically saturated to determine the effect of saturation on meibum lipid phase transition parameters. Hydrocarbon chain saturation was directly related to lipid order, phase transition temperature, cooperativity, changes in enthalpy and entropy, and could account for the changes in the lipid phase transition parameters observed with age. Unsaturation could contribute to decreased tear film stability with age.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Sledge S,Henry C,Borchman D,Yappert MC,Bhola R,Ramasubramanian A,Blackburn R,Austin J,Massey K,Sayied S,Williams A,Georgiev G,Schikler KNdoi
10.3390/ijms18091862subject
Has Abstractpub_date
2017-08-28 00:00:00issue
9issn
1422-0067pii
ijms18091862journal_volume
18pub_type
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