Luekocyte adherence inhibition in response to human orbital and lacrimal extracts in patients with Graves’ ophthalmopathy
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Leukocyte adherence inhibition (LAI) may be a test for cell-mediated immunity or cy-tophilic antibodies. LAI tests were carried out on patients with Graves’ ophthalmopathy, using normal human lacrimal gland, orbital fat, and eye muscle extracts as antigens. The results were expressed as % LAI. The percentage leukocyte adherence inhibition in tests from patients and normal subjects were not significantly different for any preparation (Mann-Whitney tests). Taking the upper limit of normal as the mean % LAI +2SD for normal subjects, tests were positive, to eye muscle extract, in only one patient whilst borderline inhibition, in response to eye muscle and fat extracts respectively, was demonstrated in two patients. All three had active disease. LAI tests may be positive only during the acute stage of Graves’ ophthalmopathy. The significance of these findings in respect to the pathogenesis of Graves’ ophthalmopathy is discussed.
Key-wordsGraves’ ophthalmopathy leukocyte adherence inhibition cell-mediated immunity lymphocytes orbital antigens
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