Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Stealth Particles to Target Tumors

Abstract:
Stealth targeting drug delivery system could also deliver genes or gene fragments in gene therapy

Stealth Particles to Target Tumors

Washington, D.C. | August 31, 2005

Stealth nano particles may some day target tumor cells and deliver medication to specific body locations, according to Penn State chemical engineers.

"Mainly we have focused on chemotherapy drugs," says Dr. Michael Pishko, professor of chemical engineering and materials science and engineering. "But others are considering using this delivery system to deliver genes in gene therapy."

The researchers first produce nano-sized powders of the drug they wish to deliver and encapsulate them in a polymer nanoshell. The drug used for this project was paclitaxel -­ an anti breast cancer drug ­ and dexamethasone -­ a steroid frequently used to treat eye inflammation. This shell allows the drug to travel in stealth mode through the bloodstream.

"A layer-by-layer self-assembly technique was used to encapsulate core charged drug nanoparticles in a polymeric nanoshell," the researchers told attendees today (Aug. 31) at the 230th American Chemical Society Meeting, Washington, D.C.

Normally, drugs, especially the toxic drugs used for chemotherapy, trigger the human immune system into action, but, with the polymer shell for protection, these drugs can circulate longer without being removed.

"If the drugs do not trigger an immune response, then lower levels of drug can be used than currently are necessary in chemotherapy," says Pishko.

The researchers, who include Pishko, Alisar Zahr and Cheryl A. Rumbarger, graduate students in chemical engineering, tested their nanoshell in cell culture and found that it had less phagocytosis ­ removal of the drug ­ during a 24-hour period than the unencapsulated drug.

Combined with longer retention in the body, the researchers engineered the nanoparticle shells to target specific cells by attaching a functionalized polymer to the shell. They designed this tentacle-like projection to target a receptor on a tumor cell, or a specific location in the eye, for example. Once the drug arrives via the blood to the tumor or eye, it attaches and slowly releases its contents.

This type of drug delivery system works especially well in such highly vascularized areas such as tumors and the eye, because the drug can travel right up to the target area. Delivery to areas in the brain would not be feasible because of the blood brain barrier that prevents foreign substances from moving from the blood into the cells of the brain.

"For targeting, we could exploit the fact that cancer tumors have a lot more folic acid receptors and target those," says Pishko. "We could also use specific monoclonal antibodies to target specific tumors."

The researchers also considered delivery of drugs to specific type cells, like those in the eye. This type of stealth targeting drug delivery system could also deliver genes or gene fragments in gene therapy.

The National Science Foundation funded this research.

####
Contact:
A'ndrea Elyse Messer
Science & Research Information Officer Penn State
814-865-9481
814-865-9421
aem1@psu.edu

Copyright © Penn State

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Possible Futures

Air Force’s 30-year plan seeks 'strategic agility' August 1st, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Virus structure inspires novel understanding of onion-like carbon nanoparticles April 10th, 2014

Local girl does good March 22nd, 2014

Self Assembly

Rice rolls 'neat' nanotube fibers: Rice University researchers' acid-free approach leads to strong conductive carbon threads September 15th, 2014

Molecular self-assembly controls graphene-edge configuration September 10th, 2014

Rice chemist wins rare NSF Special Creativity Award: Grant extension will bolster Zubarev's effort to produce gold nanorods September 8th, 2014

Magnetic nanocubes self-assemble into helical superstructures September 4th, 2014

Nanomedicine

Treatment of Cell Infection by Nanotechnology September 15th, 2014

Researchers Create World’s Largest DNA Origami September 11th, 2014

Iranian Scientists Discover Nanotechnology Method to Remove Limitations in Tumor Surgery September 11th, 2014

Iranian Nanotechnology Scientists Produce Polymeric Scaffolds for Tissue Engineering September 11th, 2014

Announcements

Dolomite to launch Meros TCU-100 temperature controller at Lab-on-a-Chip & Microarray World Congress September 15th, 2014

Fonon at Cutting-Edge of 3D Military Printing: Live-Combat Scenarios Could See a Decisive Advantage with 3D Printing September 15th, 2014

Rice rolls 'neat' nanotube fibers: Rice University researchers' acid-free approach leads to strong conductive carbon threads September 15th, 2014

Simple, Cost-Effective Method Proposed for Synthesizing Zinc Oxide Nanopigments September 15th, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE