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Impact of Pigment Dispersion on Trabecular Meshwork Cells

Wang, Chao and Dang, Yalong and Loewen, Ralitsa T. and Waxman, Susannah and Shah, Priyal and Xia, Xiaobo and Loewen, Nils A. (2017) Impact of Pigment Dispersion on Trabecular Meshwork Cells. (Submitted)

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Purpose: To investigate the effect of pigment dispersion on trabecular meshwork (TM) cells.
Methods: Porcine TM cells from ab interno trabeculectomy specimens were exposed to pigment dispersion, then analyzed for changes in morphology, immunostaining, and ultrastructure. Their abilities to phagocytose, migrate, and contract were quantified. An expression microarray, using 23,937 probes, and a pathway analysis were performed.
Results: TM cells readily phagocytosed pigment granules. Pigment induced stress fiber formation (pigment (P): 60.1 ± 0.3%, n=10, control (C): 38.4 ± 2.5%, n=11, P<0.001) and contraction at 24 hours onward (P<0.01). Phagocytosis declined (P: 68.7 ± 1.3%, C: 37.0 ± 1.1%, n=3, P<0.001) and migration was reduced after 6 hours (P: 28.0.1 ± 2.3, n=12, C: 40.6 ± 3.3, n=13, P<0.01). Microarray analysis revealed that Rho, IGF-1, and TGFβ signaling cascades were central to these responses.
Conclusions: TM cell exposure to pigment dispersion resulted in reduced phagocytosis and migration, as well as increased stress fiber formation and cell contraction. The Rho signaling pathway played a central and early role, suggesting that its inhibitors could be used as a specific intervention in treatment of pigment glaucoma.


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Item Type: Article
Status: Submitted
CreatorsEmailPitt UsernameORCID
Wang, Chao
Dang, Yalongyad23@pitt.eduYAD23
Loewen, Ralitsa T.rtl13@pitt.eduRTL13
Waxman, Susannah
Shah, Priyal
Xia, Xiaobo
Loewen, Nils A.nal58@pitt.eduNAL580000-0001-7167-1213
Date: December 2017
Date Type: Submission
Refereed: No
Date Deposited: 29 Jan 2018 18:25
Last Modified: 29 Jan 2018 18:25


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