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CD18 expression in granulocytes infiltrating the vitreous fluid in patients with diabetic retinopathy

International Journal of Ophthalmology(English edition) 2015年第3期8卷 508-512页

作者： Qi Zhu Hu-Ping Song Department of Ophthalmology Yulin No.1 Hospital Department of Ophthalmology Xi'an No.4 Hospital

AIM: To assess the levels of CD18 on the surface of granulocytes infiltrating the vitreous fluid in patients with diabetic retinopathy(DR).METHODS: vitreous samples from twelve patients with non-proliferative DR with significant macula edema(group A), 33 patients with proliferative DR(grade 3 as group B, n =14, and, grade 4 as group C, n =19) were obtained during pars plana vitrectomy. vitreous samples from 12 patients with macular hole as controls(group D)were analyzed together. The infiltrating of granulocytes and its surface level of CD18 were measured by flow cytometry. The level of CD18 was presented as the mean channel fluorescence(MCF) on a logarithmic scale. RESULTS: Granulocytes were detected in 6 of 12 vitreous samples from group A, 9 of 14 from group B, 15 of 19 from group C, and none of 12 from group D. MCF of CD18 on granulocytes from groups A, B, and C were2.978 ±1.446, 3.201 ±0.692, and 4.072 ±0.837, respectively.The difference was significant(F =4.354, P =0.021).Subjects with more severe DR were more likely to have a higher level of CD18 MCF(trend test, 掊2=7.351, P =0.007).CD18 MCF was significantly associated with the development of DR(r =0.46, P =0.005 and β =0.147, P =0.035).CONCLUSION: Our results confirm the presence of granulocytes and the elevated levels of CD18 on the surface of them in the vitreous fluid from DR patients.These results may provide indirect evidence shown that granulocytes activation also has occurred in the retinal local compared to non-DR control.

关键词： CD18 diabetic retinopathy granulocytes inflammation vitreous fluid

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