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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 ...