فهرست مطالب مرضیه میرزاییان

Acoustic cavitation, which occurs at high intensities of ultrasound waves, can be fatal for tumor cells. On the other hand, the existence of nanoparticles in a liquid decreases the acoustic cavitation onset threshold. In this study, the combined effects of ultrasound and gold nanoparticles on breast carcinoma tumor model in BALB/c mice were studied.

The tumor-bearing mice were divided into 4 groups of control, gold nanoparticles, ultrasound, and ultrasound in the presence of gold nanoparticles. Therapeutic effects on tumors were evaluated by measuring relative tumor volume, doubling time, and 5-folding time for tumor volume.

The 5-folding time showed a significant difference between ultrasound in the presence of the gold nanoparticles and the other groups. The maximum doubling and 5-folding times were found in the ultrasound in the presence of gold nanoparticles group.

 Combined effects of ultrasound and gold nanoparticles can be used as a method for increasing the efficiency of the treatment of carcinoma tumors.

The ultrasound parameters such as intensity and time of radiation play an important role in cellular degradation. In this study, the effect of ultrasound radiation parameters on the degradation of 4T1 cells in the presence of gold nanoparticles was investigated.
The 4T1 cells were cultured. The cells were divided into 4 groups including control, gold nanoparticle, ultrasound alone, and ultrasound at the presence of gold nanoparticle. Ultrasound irradiation were performed on the cells at intensity of 0.5, 1.0, and 1.5 W/cm2, for 1, 1.5, and 2 minutes. The viability of cells was determined using MTT assay.
Findings: There was a significant difference in cell viability between the ultrasound and gold nanoparticle group and the other groups at intensity of 1.0 and 1.5 W/cm2. Moreover, there was a significant difference between the ultrasound alone and the control groups at intensity of 1.0 and 1.5 W/cm2.
Using ultrasound in the presence of gold nanoparticles increase cell death via increasing nuclei cavitation phenomenon.