Figure 4

In situ hybridization for Ccl7 mRNA in the retina following exposure to 24 hours of light damage. A: Staining for Ccl7 was not observed in the retinas of dim-reared animals B-D: In retinas exposed to 24 hrs light damage (LD), Ccl7 expression was found in infrequent clusters of nuclei within the outer nuclear layer (ONL) of the superior retina (arrowheads), with few in the inferior (data not shown). E-F: Ccl7 expression was also apparent in radial processes (arrowhead) dispersed within inner nuclear layer (INL) of the superior retina, following 24 hrs of LD. G: Ccl7 staining was less evident in the inferior portion of the retina following LD. H-K: Ccl7-stained nuclei (red) in the ONL were found to coincide with activated IBA1-immunolabeled microglia (green; arrowheads). L-N: Staining for Ccl7 mRNA (red) in the INL showed strong co-localization for vimentin-immunreactive Müller cell processes (arrowheads). O-P: Ccl7-expressing cells in the INL (red; arrowheads) were negative for IBA1 immunostaining. INL, inner nuclear layer; IHC, immunohistochemistry; ISH, in situ hybridization; ONL, outer nuclear layer; OS, outer segments.