Localization of septin 8 in murine retina, and spatiotemporal expression of septin 8 in a murine model of photoreceptor cell degeneration.
The septins, which form a conserved family of cytoskeletal GTP-binding proteins in mammals, comprise stable heteromeric complexes and have diverse roles in protein scaffolding, cytokinesis, vesicle trafficking and plasma membrane integrity following cell division. The goal of this study was to determine the localization of septin 8 in murine adult retina, and analyze the spatiotemporal expression of septin 8 in a murine model of photoreceptor cell degeneration. Expression of septin 8 in the normal retina of mouse and rat was observed by using immunohistochemistry and Western blotting. Furthermore, time course of the expression of septin 8 in mouse photoreceptor cell degeneration were examined by immunohistochemistry combined with hematoxylin and eosin staining, and in situ DNA fragment labeling method. In normal mouse and rat retina, localization of septin 8 is restricted in nuclei of photoreceptor cells. 96 h after intravitreal injection of cobalt chloride most photoreceptor cells lost septin 8 immunostaining at the same time as nuclear DNA fragmentation. The results of this study show that septin 8 protein is present in the specific location within the retina. Furthermore, the disappearance of septin 8 in the nuclei of photoreceptor cells is concomitant with nuclear DNA fragmentation. This suggests that loss of septin 8 could be a useful prognostic indicator for photoreceptor cell degeneration.
Hara
Akira
A
Department of Tumor Pathology, Gifu University Graduate School of Medicine, 1-1 Yanagido, Gifu 501-1194, Japan. ahara@gifu-u.ac.jp
Taguchi
Ayako
A
Niwa
Masayuki
M
Aoki
Hitomi
H
Yamada
Yasuhiro
Y
Ito
Hidenori
H
Nagata
Koh-ichi
K
Kunisada
Takahiro
T
Mori
Hideki
H
D000818:Animals; D015153:Blotting, Western; D045744:Cell Line, Tumor; D003035:Cobalt / Q000494:pharmacology; D053938:DNA Fragmentation; D004801:Eosine Yellowish-(YS); D019204:GTP-Binding Proteins / Q000096:biosynthesis / Q000378:metabolism*; D006416:Hematoxylin; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D020419:Photoreceptor Cells, Vertebrate / Q000187:drug effects / Q000473:pathology*; D051381:Rats; D017208:Rats, Wistar; D012160:Retina / Q000378:metabolism*; D012162:Retinal Degeneration / Q000235:genetics / Q000378:metabolism* / Q000473:pathology*; D013194:Staining and Labeling; D013997:Time Factors; D014018:Tissue Distribution
D003035:Cobalt; D019204:GTP-Binding Proteins; C018021:cobaltous chloride; D004801:Eosine Yellowish-(YS); D006416:Hematoxylin