Objective To study the effect of a shaking method to isolate murine retinal pigment epithelium (RPE) cells for RNA extraction. Methods This was an experimental study. After an eye cup was made, an RNA-protected reagent and shaking method were used to isolate the RPE of mice (n=4). Immunohistochemistry staining was used to detect the status of the RPE residue, the detachable cells were collected and the total RNA was extracted. Other methods such as auto isolation, the enzyme method and eye-cup method were used to isolate the RPE and extract total RNA(each group n=4). The quantity of total RNA was compared among the different methods and quantitative real-time PCR was used to compare the RPE65, vWF and COL6A1 mRNA levels. The effect that the shaking method had on RPE isolation was studied. A one-way ANOVA and independent sample t-test were used in the statistical analysis of the data. Results The four methods resulted in statistically different quantities of total RNA (F=8.538, P<0.01). The shaking method resulted in complete isolation of RPE from the choroid tissue and was proven by immunohistochemistry staining. The quantity of total RNA obtained by the shaking method was 234.47±49.13 ng, which was similar to that obtained by the auto isolation and enzyme methods (P>0.05) but less than that obtained by the eye-cup method (P<0.05). A comparison of the four methods showed statistically significant differences in the expression levels of RPE65 mRNA (F=38.453, P<0.01). The expression of RPE65 mRNA was similar with the shaking and auto isolation methods (P>0.05), but was lower than the enzyme method (P<0.01) and higher than the eye-cup method (P<0.01). The expression of vWF and COL6A1 mRNA by the four methods were significantly different (F=45.432, 90.498, P<0.01). The expression of vWF mRNA by the shaking method was lower than with the auto isolation method (P<0.05), was similar to the enzyme method (P>0.05), and much lower than the eye-cup method (P<0.01). The expression of COL6A1 mRNA by the shaking method was similar to that obtained with the auto isolation and enzyme methods (P>0.05), but much lower than the eye-cup method (P<0.01). Conclusion The shaking method is effective, convenient and stable. This method can maximally decrease contamination of the choroid for total RNA extraction and allows further study of the gene transcription of RPE in small samples.
齐首楠,王晨光,赵亮亮,苏冠方,程岩,田蕊,杨欣悦,王丽丽. 振荡法分离小鼠视网膜色素上皮细胞提取总RNA的效果[J]. 中华眼视光学与视觉科学杂志, 2016, 18(1): 19-24.
Qi Shounan,Wang Chenguang,Zhao Liangliang,Su Guanfang,Cheng Yan,Tian Rui,Yang Xinyue,Wang Lili. A study to isolate mouse retinal pigment epithelium cells with a shaking method for RNA extraction. Chinese Journal of Optometry Ophthalmology and Visual science, 2016, 18(1): 19-24. DOI: DOI:10.3760/cma.j.issn.1674-845X.2016.01.005
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