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Cancer

 

Extremely low frequency (ELF) pulsed-gradient magnetic fields inhibit malignant tumour growth at different biological levels

(Date: 2002)

Extremely low frequency (ELF) pulsed-gradient magnetic field (with the maximum intensity of 0.6-2.0 T, gradient of 10-100 T.M(-1), pulse width of 20-200 ms and frequency of 0.16-1.34 Hz treatment of mice can inhibit murine malignant tumour growth, as seen from analyses at different hierarchical levels, from organism, organ, to tissue, and down to cell and macromolecules. Such magnetic fields induce apoptosis of cancer cells, and arrest neoangiogenesis, preventing a supply developing to the tumour. The growth of sarcomas might be amenable to such new method of treatment.


  • Author: Zhang, X. and Zhang, H. and Zheng, C. and Li, C. and Xiong, W.
  • Year: 2002
  • Link: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=12127939
  • Comment:Zhang, Xinchen Zhang, Husheng Zheng, Congyi Li, Chaoyang Zhang, Xinsong Xiong, Wei Research Support, Non-U.S. Gov't England Cell biology international Cell Biol Int. 2002;26(7):599-603.
  • Address: Biomedical Physics Unit, Department of Physics, Wuhan University, Wuhan, 430072, China.
  • Booktitle: Cell Biol Int

 

[Effects of steep pulsed electric fields on cancer cell proliferation and cell cycle]

(Date: 2004)

To assess study the cytocidal and inhibitory effects of steep pulsed electric fields (SPEFs) on ovarian cancer cell line SKOV3, the cancer cell suspension was treated by SPEFs with different parameters (frequency, pulse duration, peak value of voltage). Viability rate and growth curves of two test groups (high dosage and low dosage of SPEFs) and one control group were also measured. The DNA contents and cell cycle were analyzed by flow cytometry (FCM). Different dosing levels of SPEFs exerted obviously different effects on cancer cell viability. With the enhancement of each pulse parameter, the viability rate was promoted and the inhibitory effect on the proliferation of treated cells was more evident. The cells exposed to SPEFs grew slower than the control. The ratio of S+G2/M phase cells was decreased, which restrained the DNA synthesis and division, but the ratio of G0/G1 phase cells was increased in the treated groups. It was also indicated that the SPEFs blocked the cell transition from G0/G1 phase to S+G2/M phase. There was a significant difference in cell cycle between treated group and control group (P<0.01). Lethal effects of SPEFs were represented by inhibiting the cancer cell proliferation at the cell level and by influencing the cell cycle at the DNA level.


  • Author: Yao, C. and Sun, C. and Mi, Y. and Xiong, L. and Hu, L. and Hu, Y.
  • Year: 2004
  • Link: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=15357428
  • Comment:Yao, Chenguo Sun, Caixin Mi, Yan Xiong, Lan Hu, Lina Hu, Ya English Abstract Research Support, Non-U.S. Gov't
  • Address: Key Lab of High Voltage Engineering and Electrical New Technology, Ministry of Education, Chongqing University, Chongqing 400044, China.
  • Booktitle: Sheng Wu Yi Xue Gong Cheng Xue Za Zhi

 

Effects of pulsed magnetic stimulation on tumor development and immune functions in mice

(Date: 2006)

We investigated the effects of pulsed magnetic stimulation on tumor development processes and immune functions in mice. A circular coil (inner diameter = 15 mm, outer diameter = 75 mm) was used in the experiments. Stimulus conditions were pulse width = 238 micros, peak magnetic field = 0.25 T (at the center of the coil), frequency = 25 pulses/s, 1,000 pulses/sample/day and magnetically induced eddy currents in mice = 0.79-1.54 A/m(2). In an animal study, B16-BL6 melanoma model mice were exposed to the pulsed magnetic stimulation for 16 days from the day of injection of cancer cells. A tumor growth study revealed a significant tumor weight decrease in the stimulated group (54% of the sham group). In a cellular study, B16-BL6 cells were also exposed to the magnetic field (1,000 pulses/sample, and eddy currents at the bottom of the dish = 2.36-2.90 A/m(2)); however, the magnetically induced eddy currents had no effect on cell viabilities. Cytokine production in mouse spleens was measured to analyze the immunomodulatory effect after the pulsed magnetic stimulation. tumor necrosis factor (TNF-alpha) production in mouse spleens was significantly activated after the exposure of the stimulus condition described above. These results showed the first evidence of the anti-tumor effect and immunomodulatory effects brought about by the application of repetitive magnetic stimulation and also suggested the possible relationship between anti-tumor effects and the increase of TNF-alpha levels caused by pulsed magnetic stimulation.


  • Author: Yamaguchi, S. and Ogiue-Ikeda, M. and Sekino, M. and Ueno, S.
  • Year: 2006
  • Link: http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=16304693
  • Comment:Yamaguchi, Sachiko Ogiue-Ikeda, Mari Sekino, Masaki Ueno, Shoogo Research Support, Non-U.S. Gov't United States Bioelectromagnetics Bioelectromagnetics. 2006 Jan;27(1):64-72.
  • Address: Department of Biomedical Engineering, Graduate School of Medicine, University of Tokyo, Japan. chikko@medes.m.u-tokyo.ac.jp
  • Booktitle: Bioelectromagnetics

 

Therapeutic electromagnetic field effects on angiogenesis and tumor growth

(Date: 2001)

BACKGROUND: A new approach to cancer therapy based on the application of therapeutic electromagnetic fields (TEMF) has been developed by EMF Therapeutics, Inc., Chattanooga, TN, USA. This study was designed to assess the effect of TEMF on tumor vascularization and growth of murine 16/C mammary adenocarcinoma cells in C3H/HeJ mice. MATERIALS AND METHODS: Implanted tumors were allowed to grow for seven days until the tumor volume reached 100 mm3 before treatment was started. Mice (20 per control, 10 per EMF exposed group) received treatment (10 minutes per day with 0, 10 mT, 15 mT or 20 mT) with a 120 pulses per second pulsating magnetic field. Tumor growth was assessed throughout the treatment period. The extent of tumor vascularization was evaluated by immunohistochemical staining for CD31. RESULTS: Exposure to TEMF significantly reduced tumor growth, significantly reduced the percentage of area stained for CD31 indicating a reduction in the extent of vascularization and there was a concomitant increase in the extent of tumor necrosis. CONCLUSION: A novel TEMF treatment safely reduced growth and vascularization of implanted breast cancers in mice. IMPLICATION: TEMF may prove a useful adjuvant to increase the therapeutic index of conventional cancer therapy.