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Ординатура / Офтальмология / Английские материалы / Retinal Degenerative Diseases Laboratory and Therapeutic Investigations_Anderson_2008.pdf
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154

J.M. Thurman et al.

18.3 Results

18.3.1Oxidative Stress, but Not Chemical Hypoxia, Alters the Expression of Complement Regulatory Proteins on ARPE-19 Cells

We have previously found that antimycin A sensitizes renal epithelial cells to complement-mediated injury (Thurman et al. 2006). We have also previously reported that oxidative stress of ARPE-19 cells results in a decrease in levels of DAF and CD59 surface levels, whereas MCP remains unchanged (Rohrer and Renner 2008). To determine whether decreased expression of these complement regulatory proteins is a common response to many types of cellular stress, ARPE-19 cells were grown as monolayers and were treated with 1 μM antimycin A for 1 h. After treating the cells with antimycin A, cell surface expression of the complement regulatory proteins DAF, MCP, and CD59, was measured by FACS analysis (Fig. 18.1). Chemical hypoxia of the ARPE-19 cells resulted in a slight increase in surface

Fig. 18.1 Surface expression of endogenous complement inhibitors by ARPE-19 cells does not decrease in response to hypoxic stress; ARPE-19 cells were treated with 1 μM antimycin A for 1 h. The cells were stained for DAF, MCP, and CD59, and the surface expression of these proteins on experimental cells (dark line) was compared to controls (shaded curve) and isotype controls (gray line). (a) Surface expression of DAF increased in antimycin-A-treated cells; whereas (b) surface expression of MCP and (c) CD59 did not change after treatment with Antimycin A