Figure 6

Recruitment of microglia positive for ionized calcium binding adaptor molecule (IBA)1 and negative for ED1 following BCL in retinas injected with chemokine (C-C motif) ligand (Ccl)2 small interfering (si)RNA. (A–F) Representative images from the superior mid-periphery showed immunoreactivity for IBA1 (red), but not ED1 (green), in ramified ED1−/IBA1+ nuclei that were recruited to the outer nuclear layer (ONL) and outer plexiform layer (OPL) after 24 hours of BCL (A–C; arrows). (G) The total number of these recruited ED1−/IBA1+ nuclei per retina decreased significantly in Ccl2 siRNA-injected retinas following BCL, compared with both the Invivofectamine-only group and the scrambled siRNA control group (P < 0.05). (H) Numbers of ED1−/IBA1+ nuclei recruited to either the OPL or the ONL/subretinal space were reduced in retinas injected with Ccl2 siRNA in comparison with control groups (P < 0.05). Inivofectamine-only (n = 4), scrambled siRNA (n = 4), Ccl2 siRNA (n = 4). Error bars represent SEM. *Significant change at P <0.05 using ANOVA with Tukey’s post hoc test. INL, inner nuclear layer; OS, outer segments.