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(Investigative Ophthalmology and Visual Science. 2000;41:4195-4202.)
© 2000 by The Association for Research in Vision and Ophthalmology, Inc.

Complement Regulatory Activity of Normal Human Intraocular Fluid Is Mediated by MCP, DAF, and CD59

Jeong-Hyeon Sohn1,3, Henry J. Kaplan1,3, Hye-Jung Suk1,3, Puran S. Bora2,3 and Nalini S. Bora1,3

1 From the Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, 2 Department of Medicine, Division of Cardiology, St. Louis University Medical Center, St. Louis, Missouri.

PURPOSE. To identify the molecules in normal human intraocular fluid (aqueous humor and vitreous) that inhibit the functional activity of the complement system.

METHODS. Aqueous humor and vitreous were obtained from patients with noninflammatory ocular disease at the time of surgery. Samples were incubated with normal human serum (NHS), and the mixture assayed for inhibition of the classical and alternative complement pathways using standard CH50 and AH50 hemolytic assays, respectively. Both aqueous humor and vitreous were fractionated by microconcentrators and size exclusion column chromatography. The inhibitory molecules were identified by immunoblotting as well as by studying the effect of depletion of membrane cofactor protein (MCP), decay-accelerating factor (DAF), and CD59 on inhibitory activity.

RESULTS. Both aqueous humor and vitreous inhibited the activity of the classical pathway (CH50). Microcentrifugation revealed the major inhibitory activity resided in the fraction with an Mr >= 3 kDa. Chromatography on an S-100-HR column demonstrated that the most potent inhibition was associated with the high-molecular-weight fractions (>=19.5 kDa). In contrast to unfractionated aqueous and vitreous, fractions with an Mr >= 3 kDa also had an inhibitory effect on the alternative pathway activity (AH50). The complement regulatory activity in normal human intraocular fluid was partially blocked by monoclonal antibodies against MCP, DAF, and CD59. Immunoblot analysis confirmed the presence of these three molecules in normal intraocular fluid.

CONCLUSIONS. Our results demonstrate that normal human intraocular fluid (aqueous humor and vitreous) contains complement inhibitory factors. Furthermore, the high-molecular-weight factors appear to be the soluble forms of MCP, DAF, and CD59.




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