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Multistage nanovector system provides sustained delivery of siRNA cancer therapeutic in mice
Date:5/5/2010

New research by scientists at The University of Texas Health Science Center at Houston (UTHealth) and The University of Texas M. D. Anderson Cancer Center could make it easier for patients to use a family of promising experimental cancer therapeutics known as small interfering RNA (siRNA).

siRNA is a part of an innovative strategy to disrupt the activity of cancer-related genes that has broad applications to other diseases.

In the May 1 issue of Cancer Research, the scientists reported that a multistage nanovector system for the delivery of siRNA significantly lengthened the therapeutic effects of the treatment in two independent mouse models of advanced ovarian cancer.

The researchers reported that a single intravenous dose of siRNA targeting the EphA2 oncoprotein provided the same tumor shrinkage for three weeks as that now achieved by six doses over the same period.

"The multistage delivery system is revolutionary in that it allows the therapeutic payloads to cross the biological barriers in the body and reach their target. It further helps release agents over long periods of time directly into the bloodstream, which is unprecedented," said Mauro Ferrari, Ph.D., chairman of the Department of NanoMedicine and Biomedical Engineering at The University of Texas Medical School at Houston, which is part of UTHealth. "We are very excited about the results of this paper, since it provides the first validation of the therapeutic advantages of the multistage delivery system in animal models of cancer."

The multistage nanovector system is composed of nanoporous silicon carrier particles that are about 100 times smaller than a strand of hair, which can be loaded with tiny bubbles of fat called nanoliposomes containing siRNA. The system provides for the release of the nanoliposomes and their contents.

"This is an exciting development because RNA interference has worked well in an animal model but has suc
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Contact: Robert Cahill
Robert.Cahill@uth.tmc.edu
713-500-3030
University of Texas Health Science Center at Houston
Source:Eurekalert  

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Multistage nanovector system provides sustained delivery of siRNA cancer therapeutic in mice
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