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Delivery Systems and Specific Molecular Structures Needed for siRNA
Therapeutic Success
LONDON, April 7, 2008 /PRNewswire/ -- Silence Therapeutics plc (AIM:SLN) Europe's leading RNAi-focused biotechnology company, today comments on two recent journal articles: Nature(1) "Sequence-and target-independent angiogenesis suppression by siRNA via TLR3" Mark E. Kleinman, et. al., and Molecules and Cells(2) "Immune Activation by siRNA/Liposome Complexes in Mice is Sequence-Independent: Lack of a Role for Toll-like Receptor 3," Kim et. al. In these two publications, researchers questioned current thinking on the mode of action of siRNA therapeutics suggesting that they work by mechanisms other than via specific gene silencing.
Data published in the Nature article (Kleinman et. al.) have been interpreted in recent days in the lay press as a "Setback for Some RNA-Based Drugs" (New York Times(5)). Silence Therapeutics views the cited Nature paper, and another recent paper in Molecules and Cells(2) as highlighting the need for a functional delivery system to ensure the therapeutic siRNA is able to enter cells and achieve gene silencing.
Both studies further reinforce the importance of chemically modifying siRNA to create molecular structures which do not cause unwanted immune stimulation such as cytokine release and interferon response.
The two new studies support the long-standing development approach of Silence Therapeutics, which has focused its research on developing both a potent RNAi-mediating delivery system (AtuPLEX) and chemically-modified siRNA (AtuRNAi) molecules.
Jeff Vick, CEO of Silence Therapeutics, said, "More than eight years
ago, Silence Therapeutics recognized the need for, and pioneered the
development of, a functional systemic RNAi delivery system that combines
proprietary chemical modification and lipid technologies to achieve
efficient intracellular uptake without triggering an immune s
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