Soluble Fas ligand expression in the ocular fluids of uveitis patients.
OBJECTIVE
The expression of Fas ligand (FasL) in ocular tissues is thought to play a critical role in maintaining immune privilege in the eye. In this study, to clarify the involvement of the Fas-FasL system in inflammatory processes of the eye,we examined soluble FasL (sFasL) in ocular inflammation.


METHODS
Using ELISA systems recently developed, sFasL concentrations in aqueous humor (AH) and/or vitreous fluid (VF) were measured. AH was obtained from 17 eyes of 17 uveitis patients and from 12 eyes of 12 non-uveitis (cataract) patients. VF was obtained from 22 eyes of 22 uveitis patients and 7 eyes of 7 non-uveitis (macular hole) patients. Serum levels of sFasL were also determined.


RESULTS
sFasL in AH and VF was below the detection limit of the ELISA systems in all non-uveitis eyes. On the other hand, sFasL was detected in AH from uveitis patients where it measured 367.0 +/- 154.7 pg/ml (mean +/- SEM). sFasL was also detected in VF from uveitis patients where it measured 1132.2 +/- 281.7 pg/ml. None of the sera from patients with or without uveitis contained a detectable level of sFas L.


CONCLUSIONS
sFasL levels in AH and VF are elevated in the eye during ocular inflammation. Fas-FasL mediated apoptosis may play an important role in the regulation of inflammation during uveitis.
Sotozono
C
C
Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kyoto, Japan. csotozon@opth.kpu-m.ac.jp
Sano
Y
Y
Suzuki
T
T
Tada
R
R
Ikeda
T
T
Nagata
S
S
Kinoshita
S
S
D000368:Aged; D001082:Aqueous Humor / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D053222:Fas Ligand Protein; D005260:Female; D006801:Humans; D008297:Male; D008562:Membrane Glycoproteins / Q000378:metabolism*; D008875:Middle Aged; D012995:Solubility; D014605:Uveitis / Q000378:metabolism*; D014822:Vitreous Body / Q000378:metabolism*
C505661:FASLG protein, human; D053222:Fas Ligand Protein; D008562:Membrane Glycoproteins