Priority Research Papers:
Tumor-targeting Salmonella typhimurium A1-R arrests growth of breast-cancer brain metastasis
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Yong Zhang1, Shinji Miwa1,2, Nan Zhang1, Robert M. Hoffman1,2 and Ming Zhao1
1 AntiCancer, Inc., San Diego, CA, USA
2 Department of Surgery, University of California San Diego, San Diego, CA, USA
Robert M. Hoffman, email:
Ming Zhao, email:
Keywords: Salmonella typhimurium A1-R, breast cancer, 4T1, brain metastasis, orthotopic
Received: October 08, 2014 Accepted: November 14, 2014 Published: November 15, 2014
Brain metastasis is a morbid, treatment-resistant, end-stage frequent occurrence in breast cancer patients. The aim of this study was to evaluate the efficacy of tumor-targeting Salmonella typhimurium A1-R on breast cancer brain metastases. High brain-metastatic variants of murine 4T1 breast cancer cells expressing red fluorescent protein (RFP) were injected orthotopically in the mammary fat pad in non-transgenic nude mice or in the left ventricle of non-transgenic nude mice and transgenic nude mice expressing nestin-driven green fluorescent protein (ND-GFP). ND-GFP mice express GFP in nascent blood vessels. In the orthotopically-injected mice, the primary tumor was surgically-resected in order to allow brain metastasis to develop. At various time points, the tumors and vasculature in the brain were imaged by confocal and stereo fluorescence microscopy. Some of the breast cancer cells that reached the brain extravasated and grew perivascularly and some of the cells proliferated within the vasculature. S. typhimurium A1-R significantly inhibited brain metastasis in both metastatic models and increased survival of the orthotopically-transplanted, primary-tumor-resected mice (p<0.05). The results of the present study suggest the clinical potential of bacterial therapy of breast cancer brain metastasis.
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