PURPOSE: To investigate the lymphatic vascular microvessel density (LVD) and the blood vascular microvessel density (MVD) and their distribution in excised leaking blebs after mitomycin C trabeculectomy and normal conjunctiva specimens. MATERIALS AND METHODS: LVD and MVD in normal human conjunctiva (n=8) and excised blebs in the hypocellular stroma and peribleb tissue (conjunctiva adjacent to hypocellular bleb tissue) (n=8) were evaluated by immunohistochemistry using antibodies raised against Lymphatic Vessel Endothelial Receptor 1 (D2-40, lymphatic endothelium) and CD34 (vascular endothelium). LVD and MVD counts were performed by light microscopy in 5 fields at ×20 magnification by 3 observers. Differences were determined using Mann-Whitney U test (P<0.05 was considered significant). RESULTS: The leaking blebs showed typical epithelial-stromal domes with areas of acellular stroma covered by attenuated epithelium and surrounded by normal conjunctival epithelium and a dense scar-like matrix replacing the substantia propria. The LVD and MVD were significantly reduced to nil in the hypocellular conjunctival stroma of the excised blebs compared with normal conjunctiva (21.42 vs. 1.16, P<0.002 and 24.28 vs. 1, P<0.008, respectively). The LVD and MVD was also reduced (2- to 2.5-fold) in the peribleb stroma when compared with normal conjunctiva specimens. CONCLUSIONS: In this study we show reduced LCD and MVD in the hypocellular and peribleb stroma. These results may suggest a role of these vessels in an altered immune response in leaking blebs leading to an increased risk for blebitis.
PURPOSE: To investigate the lymphatic vascular microvessel density (LVD) and the blood vascular microvessel density (MVD) and their distribution in excised leaking blebs after mitomycin C trabeculectomy and normal conjunctiva specimens. MATERIALS AND METHODS: LVD and MVD in normal human conjunctiva (n=8) and excised blebs in the hypocellular stroma and peribleb tissue (conjunctiva adjacent to hypocellular bleb tissue) (n=8) were evaluated by immunohistochemistry using antibodies raised against Lymphatic Vessel Endothelial Receptor 1 (D2-40, lymphatic endothelium) and CD34 (vascular endothelium). LVD and MVD counts were performed by light microscopy in 5 fields at ×20 magnification by 3 observers. Differences were determined using Mann-Whitney U test (P<0.05 was considered significant). RESULTS: The leaking blebs showed typical epithelial-stromal domes with areas of acellular stroma covered by attenuated epithelium and surrounded by normal conjunctival epithelium and a dense scar-like matrix replacing the substantia propria. The LVD and MVD were significantly reduced to nil in the hypocellular conjunctival stroma of the excised blebs compared with normal conjunctiva (21.42 vs. 1.16, P<0.002 and 24.28 vs. 1, P<0.008, respectively). The LVD and MVD was also reduced (2- to 2.5-fold) in the peribleb stroma when compared with normal conjunctiva specimens. CONCLUSIONS: In this study we show reduced LCD and MVD in the hypocellular and peribleb stroma. These results may suggest a role of these vessels in an altered immune response in leaking blebs leading to an increased risk for blebitis.
Authors: Yifan Wu; Young Jin Seong; Kin Li; Dongwon Choi; Eunkyung Park; George H Daghlian; Eunson Jung; Khoa Bui; Luping Zhao; Shrimika Madhavan; Saren Daghlian; Patill Daghlian; Desmond Chin; Il-Taeg Cho; Alex K Wong; Martin Heur; Sandy Zhang-Nunes; James C Tan; Masatsugu Ema; Tina T Wong; Alex S Huang; Young-Kwon Hong Journal: JCI Insight Date: 2020-07-09
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