Document Detail

Soluble Fas and Fas ligand in human tear fluid after photorefractive keratectomy.
MedLine Citation:
PMID:  10574814     Owner:  NLM     Status:  MEDLINE    
BACKGROUND/AIMS: The Fas-Fas ligand system is thought to be involved in stromal cell apoptosis after corneal wounding. The aim was to measure changes in human tear fluid levels of soluble Fas (sFas) and Fas ligand (sFasL) following myopic photorefractive keratectomy (PRK). METHODS: Tear samples of 59 patients were collected preoperatively, and 1 or 2 days after PRK. Tear fluid sFas or sFasL concentrations were determined using sandwich ELISAs. Subsequently, tear flow corrected concentrations (releases) were calculated to compensate for the postoperative tear hypersecretion. RESULTS: The preoperative tear fluid flows (TFF) were 6.4 (1.7) microl/min (mean (SEM)) in sFas group (n = 18), and 7.5 (1.5) microl/min in sFasL group (n = 39). Postoperatively TFFs increased to 37.9 (10.9) microl/min (p = 0.003) and 58.3 (7.0) microl/min (p = 0.000), respectively. The mean preoperative sFas concentration (24.4 (11.6) U/ml) decreased to 9.7 (4.1) U/ml (p = 0.001) postoperatively, and the mean sFasL concentration (299.1 (28.8) ng/l) to 118.7 (15.9) ng/l (p = 0.000). However, the release of both substances increased significantly: sFas from 87.3 (29.4) mU/min to 229.4 (82.9) mU/min (p = 0.002) and sFasL from 1620.6 (226.4) fg/min to 4777.1 (596.1) fg/min (p = 0.000). CONCLUSIONS: Both sFas and sFasL are normal constituents of human tears. Despite a decrease in concentrations related to reflex tears, the release of sFas and sFasL increases significantly after excimer laser photorefractive keratectomy, which suggests that they are involved in corneal healing after PRK in humans.
I Tuominen; M Vesaluoma; A M Teppo; C Grönhagen-Riska; T Tervo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The British journal of ophthalmology     Volume:  83     ISSN:  0007-1161     ISO Abbreviation:  Br J Ophthalmol     Publication Date:  1999 Dec 
Date Detail:
Created Date:  2000-01-28     Completed Date:  2000-01-28     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0421041     Medline TA:  Br J Ophthalmol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1360-3     Citation Subset:  IM    
Helsinki University Eye Hospital, Helsinki, Finland.
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MeSH Terms
Antigens, CD95 / metabolism*
Fas Ligand Protein
Lasers, Excimer
Membrane Glycoproteins / metabolism*
Myopia / surgery*
Photorefractive Keratectomy*
Postoperative Period
Tears / metabolism*
Reg. No./Substance:
0/Antigens, CD95; 0/FASLG protein, human; 0/Fas Ligand Protein; 0/Membrane Glycoproteins

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