Figure 7From: Tumor necrosis factor alpha has an early protective effect on retinal ganglion cells after optic nerve crush An intraocular injection of TNFΑ causes nuclear accumulation of JUN in Müller cells. (A-C) PBS injections revealed a baseline accumulation of JUN in the ganglion cell layer (GCL) with minimal activation in the inner nuclear layer (INL). (D-F) A single injection of TNFΑ resulted in widespread accumulation of JUN (red) in SOX2-positive Müller cells (green) as early as 7 hours after treatment. A subset of SOX2-positive cells were negative for JUN and exhibited rounded nuclei and no processes that may be amacrine cells (F, arrows). Additionally, in the GCL a subset of SOX2+ cells also exhibited JUN nuclear accumulation and may be astrocytes. (G-I) Most of the Müller cells responded to TNFΑ with an increase in labeling for JUN accumulation, but only a subset of these also upregulated NFΚB (arrow). Cells were counterstained with 4’,6-diamidino-2-phenylindole (blue, I). After injection, sections were analyzed at 7 hours (n =3; A-F), and 24 hours (n =3; G-I). Scale bars (F) =50 μm and (I) =10 μm.Back to article page