[Quantitative ultrasonic naked gene delivery and the effect control].
OBJECTIVE
To study ultrasonic naked gene delivery and its effect control, and to investigate the new methods, which are easy-to-use, reliable and non-cytotoxic for application in gene therapy so as to build an optimal parameter set.


METHODS
Suspensions of different kinds of cells were exposed to calibrated ultrasound field (35.1 kHz) with different parameters for gene delivery. Morphology, membrane permeability, naked gene expression efficiency, threshold of cell damage and cell viability were examined by laser scanning confocal microscopy, fluorescent microscopy, flow cytometry and spectrophotometer.


RESULTS
The plasmid of green fluorescent protein (GFP) was delivered into S180 cells under optimal parameters without cell damage. The transfection rate was about 35.83% +/- 2.53% (n=6) in viable cells. The GFP expression intensity in ultrasound exposure group had a higher fluorescent peak than AVV-GFP group and control group (P<0.001).


CONCLUSIONS
Ultrasound can effectively deliver naked gene into cells using optimal parameters without cell damage. The gene uptake depends on energy accumulation at 90% of cell viability, and the tendency of apoptosis is found in S180 tumor cells.
Wang
Wei
W
Institute of Biomedical Informatics, Lanzhou University, Lanzhou Gansu, China. kinggreat@163.com
Sun
Wen-heng
WH
Bian
Zheng-zhong
ZZ
Zhou
Qin-wu
QW
Miao
Ya-lin
YL
D000818:Animals; D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism; D002470:Cell Survival; D002478:Cells, Cultured; D002645:Chickens; D004912:Erythrocytes; D005069:Evaluation Studies as Topic; D017930:Genes, Reporter / Q000235:genetics; D015316:Genetic Therapy / Q000379:methods*; D049452:Green Fluorescent Proteins / Q000235:genetics; D010539:Permeability; D010957:Plasmids / Q000235:genetics*; D011817:Rabbits; D012510:Sarcoma 180; D014162:Transfection / Q000379:methods*; D014465:Ultrasonics
D049452:Green Fluorescent Proteins