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Elegant delivery
Date:7/15/2012

Our strategy is to 'dry-up' that moat by neutralizing the TGF-β. We do that using the inhibitor that is released from the nanolipogels. The inhibitor effectively stops the tumor's ability to stunt an immune response."

At the same time, the researchers boost the immune response in the region surrounding the tumor by delivering IL-2--a cytokine, which is a protein that tells protective cells that there is a problem--in the same drug delivery vehicle. "The cytokine can be thought of as a way to get reinforcements to cross the dry moat into the castle and signal for more forces to come in," adds Fahmy. In this case, the reinforcements are T-cells, the body's anti-invader 'army.' By accomplishing both treatment goals at once, the body has a greater chance to defeat the cancer.

The current study targeted both primary melanomas and melanomas that have spread to the lung, demonstrating promising results with a cancer that is well-suited to immunotherapy and for which radiation, chemotherapy and surgery tend to prove unsuccessful, particularly when metastatic. The researchers did not evaluate primary lung cancers in this study.

"We chose melanoma because it is the 'poster child' solid tumor for immunotherapy," says co-author Stephen Wrzesinski, now a medical oncologist and scientist at St. Peter's Cancer Center in Albany, N.Y. "One problem with current metastatic melanoma immunotherapies is the difficulty managing autoimmune toxicities when the treatment agents are administered throughout the body. The novel nanolipogel delivery system we used to administer IL-2 and an immune modulator for blocking the cytokine TGF-β will hopefully bypass systemic toxicities while providing support to enable the body to fight off the tumor at the tumor bed itself."

Simply stated, to attack melanoma with some chance of success, both drugs need to be in place at the same location at the same time, and in a safe dosage. The NLGs appear to
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Contact: Josh Chamot
jchamot@nsf.gov
703-292-7730
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

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