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RNA inhibition counteracts the growth of human mammary tumor xenografts.

Women's Health Weekly

| October 07, 2004 | COPYRIGHT 2004 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2004 OCT 7 - (NewsRx.com & NewsRx.net) -- RNA inhibition counteracts the growth of human mammary tumor xenografts.

According to a study from Austria, "colony-stimulating factor (CSF)-1 is the primary regulator of tissue macrophage production. CSF-1 expression is correlated with poor prognosis in breast cancer and is believed to enhance mammary tumor progression and metastasis through the recruitment and regulation of tumor-associated macrophages. Macrophages produce matrix metalloproteases (MMPs) and vascular endothelial growth factor, which are crucial for tumor invasion and angiogenesis."

"Given the important role of CSF-1, we hypothesized that blockade of CSF-1 or the CSF-1 receptor (the product of the c-fms proto-oncogene) would suppress macrophage infiltration and mammary tumor growth. Human MCF-7 mammary carcinoma cell xenografts in mice were treated with either mouse CSF-1 antisense oligonucleotide for 2 weeks or 5 intratumoral injections of either CSF-1 small interfering RNAs or c-fms small interfering RNAs," described S. Aharinejad and colleagues, Vienna Medical University, Department of Anatomy and Cell Biology.

"These treatments suppressed mammary tumor growth by 50, 45, and 40%, respectively, and selectively downregulated target protein expression in tumor lysates. Host macrophage infiltration; host MMP-12, MMP-2, and vascular ...

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