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Ординатура / Офтальмология / Английские материалы / Retinal Degenerative Diseases Laboratory and Therapeutic Investigations_Anderson_2008.pdf
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72

F. Yingchuan et al.

investigate the expression of TGF-β1 and Smad 4 mRNA in the retina, to explore their role in the development of retinal neovascularization.

9.2 Material and Methods

9.2.1 Animals

All experimental procedures were approved by the institutional committee for the use of Animals in Research and Education. Oxygen-induced retinopathy was induced in C57BL/6 newborn mice according to the protocol of Smith (Smith et al. 1994). Briefly, litters of 7-day-old mice, together with their mothers, were exposed to 75% ± 3% oxygen for 5 days and then returned to room air, followed by 5 days of room air recovery. Another natural sized litter was raised in room air as normal control. 17-day-old mice were killed by intraperitoneal injections of overdose of sodium pentobarbital. Both eyes were enucleated and placed in 4% Para formaldehyde in PBS, and embedded in paraffin. Serial 3-um axial sections of the retina were obtained. Sections were stained with hematoxylin and eosin. Numbers of nuclei on the internal limiting membrane at the vitreous side were counted.

9.2.2 Methods

9.2.2.1TGF-β Immunohistochemistry (IH) and Smad-4 In Situ Hybridization

(ISH)

Monoclonal TGF-β1 antibody was obtained from Santa Cruz Company. The reagents for streptavidin-biotin and DAB were obtained from Zymed Company. The dilution of the primary antibody was 1:100 and DAB was used for the detection. PBS replacing the primary antibody was used as control.

Expression of Smad-4 was detected by in situ hybridization (ISH). A biotin conjugated oligonucleotide probe of mouse Smad-4 was synthesized by Shanghai Shenneng Biological Company (5’-Biotin-GGT GGC GTT AGA CTC TGC CGG GGC TAA CAG-3’; 1035–1064 bp, GC% = 63.33). The secondary detection reagents were streptavidin-conjugated to HRP, and DAB, respectively. PBS replacing the probe was used as control.

The images were captures and analyzed with Image-pro Plus software system. The result of ISH was semi-quantified with optical density value (OD).

9.2.3 Statistical Analysis

The experimental data presented as mean ± standard deviation. SPSS software was used for t test to compare between two groups. P<0.05 was considered statistically significant.