Ultrasonic enhancement of gene transfection in murine melanoma tumors - PubMed (original) (raw)
Ultrasonic enhancement of gene transfection in murine melanoma tumors
D L Miller et al. Ultrasound Med Biol. 1999 Nov.
Abstract
The enhancement of gene transfection by ultrasound (US) was evaluated in vitro and in vivo using the B16 mouse melanoma model. Cultured cells were either exposed in suspensions in vitro or implanted subcutaneously in female C57BL/6 mice for 10-14 days and, subsequently exposed, in vivo. For comparison to results with a luciferase plasmid, a reporter plasmid for green fluorescent protein (GFP) was used to evaluate transfection efficiency. US was supplied by a system, similar to a Dornier HM-3 lithotripter, that produced shock waves (SW) of 24.4 MPa peak positive and 5.2 MPa peak negative pressure amplitudes at the focus. The plasmids were mixed with the suspensions to achieve 20 ,microL mL(-1), or were injected intratumorally to provide 0.2 mg DNA per mL of tumor. Acoustic cavitation was promoted by retaining 0.2 mL of air in the 1.2-mL exposure chambers in vitro and by injecting air at 10% of tumor volume in vivo. In vitro, cell counts declined to 5.3% of shams after 800 SW exposure, with 1.4% of the cells expressing GFP after 2 days of culture. In vivo, 2 days after 400 SW exposure, viable-cell recovery from excised tumors was reduced to 4.2% of shams and cell transfection was enhanced by a factor of about 8, reaching 2.5% of cell counts (p < 0.005 in t-test). These results show that strong tumor ablation induced by US shock wave treatment can be coupled with simultaneous enhancement of gene transfection.
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