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Comparison of Cerenkov Luminescence Imaging (CLI) and gamma camera imaging for visualization of let-7 expression in lung adenocarcinoma A549 Cells
- Source :
-
Nuclear Medicine & Biology . Oct2012, Vol. 39 Issue 7, p948-953. 6p. - Publication Year :
- 2012
-
Abstract
- Abstract: Background and Aim: miRNA is an important factor for tumorigenesis which could act as a potential molecular target for tumor diagnosis. The goal of this study was to explore a new method for visualizing the expression of let-7 in lung adenocarcinoma A549 cells by Cerenkov luminescence imaging (CLI) and gamma camera imaging. Methods: The human sodium/iodine symporter (hNIS) and 3′-UTR sequence of the ras gene (RU) that complementarily binds to let-7 were cloned with hNIS serving as the reporter gene. The expression of hNIS regulated by let-7 in the fusion gene hNIS-RU was constructed; the let-7 primer (pri-let-7), which could specifically bind to RU and the mir-143 primer (pri-mir143) not binding with RU, was cloned. A549 cells were transfected with hNIS or hNIS-RU, and additional cells were cotransfected with hNIS-RU and different concentrations of pri-let-7 or pri-mir143. The cells were incubated with 740kBq 131I-containing media for 1h, 24h after transfection. CLI, gamma camera imaging, and γ counting were subsequently conducted, and the correlation among CLI, gamma camera imaging, and γ counting was compared when cotransfected with pri-let-7. Results: CLI, gamma camera imaging, and radioactive counting showed that hNIS-transfected A549 cells had significantly higher uptake of 131I compared to non-transfected cells. The uptake of 131I in hNIS-RU transfected A549 cells decreased to approximately 70% compared to hNIS-transfected cells, since hNIS-RU expression was suppressed by intracellular let-7. After cotransfection with hNIS-RU and various concentrations of pri-let-7, 131I uptake gradually decreased with increasing pri-let-7, while 131I uptake remained roughly unchanged in the presence of hNIS-RU cotransfected with different amounts of pri-mir143. CLI was highly correlated with gamma camera imaging (r 2 =0.9893) and radioactivity counting (0.9779). Conclusions: Based upon miRNA-regulated reporter genes which mediate the uptake of the radionuclide, both CLI and gamma camera imaging can noninvasively detect miRNA expression in cells, which may provide a new way for the visualization of miRNA expression. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09698051
- Volume :
- 39
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Nuclear Medicine & Biology
- Publication Type :
- Academic Journal
- Accession number :
- 79959913
- Full Text :
- https://doi.org/10.1016/j.nucmedbio.2012.05.004