Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Nanoparticles Harvest Invisible Cancer Biomarkers

Abstract:
Cancer biologists have long presumed that tumor cells shed telltale markers into the blood and that finding these blood-borne biomarkers could provide an early indicator that cancer is developing somewhere in the body. While there has been some progress in finding such markers, researchers have been largely stymied in this pursuit by the fact that such proteins are present in trace amounts that are cloaked by the few proteins present in far larger amounts, such as albumin and antibodies.

Nanoparticles Harvest Invisible Cancer Biomarkers

Bethesda, MD | Posted on November 17th, 2011

Now, a research team at the George Mason University has shown that they can fish out the "invisible" proteins masked by albumin and other high concentration proteins using porous nanoparticles decorated with a series of chemical baits, each designed to harvest specific types of trace proteins from body fluids. Better yet, hooking these proteins onto the baits, which are buried within the pores of the nanoparticles, protects them from degradation until they can be released and analyzed using mass spectroscopy.

Alessandra Luchini led the international team of investigators that designed and tested the bait-laden core-shell nanoparticles. The investigators published their work in the Journal of the American Chemical Society.

Core-shell hydrogel nanoparticles have been touted as potential protein drug delivery vehicles that would sequester these drugs from the action of protein degrading enzymes in blood until they reach their targets in the body. Luchini and her collaborators turned this paradigm on its head, choosing to use them to instead remove proteins from the blood until they can be safely collected. The key was identifying a set of 17 molecules that the researchers could attach inside the cavity structures that exist in hydrogels. These cavities are large enough to let most proteins in, but are too small for the relatively gigantic proteins that are overwhelmingly prevalent in blood and other biological fluids. To prevent smaller fragments of albumin, which are also a major blood component, from entering the nanoparticles, the investigators added to the outer shell the chemical vinylsulfonic acid, or VSA, that actively excludes albumin fragments of all sizes.

For bait molecules, Luchini and her colleagues started with a few dye molecules that biochemists have used as protein binding agents and inhibitors of protein-protein interactions in chromatography experiments. Working from the chemical structures of these molecules, the investigators created a set of dyes that they could then react with their core-shell hydrogel nanoparticles. They then mix the resulting nanoparticles with a biological fluid - whole blood, urine, and sweat, for example - and incubated for 15 minutes. The particles are collected using a centrifuge, and the captured proteins are washed out for analysis using a set of buffers.

Luchini's team showed that the nanoparticles enabled a 10,000-fold effective amplification of protein levels in the wash fluid compared to their concentration in blood. As a result, they were able to use mass spectrometry to identify a variety of proteins that were previously undetectable in blood using any type of method that would be clinically useful.

####

About The National Cancer Institute (NCI)
To help meet the goal of reducing the burden of cancer, the National Cancer Institute (NCI), part of the National Institutes of Health, is engaged in efforts to harness the power of nanotechnology to radically change the way we diagnose, treat and prevent cancer.

The NCI Alliance for Nanotechnology in Cancer is a comprehensive, systematized initiative encompassing the public and private sectors, designed to accelerate the application of the best capabilities of nanotechnology to cancer.

Currently, scientists are limited in their ability to turn promising molecular discoveries into benefits for cancer patients. Nanotechnology can provide the technical power and tools that will enable those developing new diagnostics, therapeutics, and preventives to keep pace with today’s explosion in knowledge.

For more information, please click here

Contacts:
National Cancer Institute
Office of Technology & Industrial Relations
ATTN: NCI Alliance for Nanotechnology in Cancer
Building 31, Room 10A49
31 Center Drive , MSC 2580
Bethesda , MD 20892-2580

Copyright © The National Cancer Institute (NCI)

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 Links

View abstract - "Multifunctional Core-Shell Nanoparticles: Discovery of Previously Invisible Biomarkers."

Related News Press

News and information

NanoScience: Giants of the Infinitesimal July 31st, 2014

University of Manchester selects Anasys AFM-IR for coatings and corrosion research July 30th, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Analytical solutions from Malvern Instruments support University of Wisconsin-Milwaukee researchers in understanding environmental effects of nanomaterials July 30th, 2014

Govt.-Legislation/Regulation/Funding/Policy

New imaging agent provides better picture of the gut July 30th, 2014

Watching Schrödinger's cat die (or come to life): Steering quantum evolution & using probes to conduct continuous error correction in quantum computers July 30th, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Tough foam from tiny sheets: Rice University lab uses atom-thick materials to make ultralight foam July 29th, 2014

Nanomedicine

New imaging agent provides better picture of the gut July 30th, 2014

Zenosense, Inc. July 29th, 2014

Optimum inertial design for self-propulsion: A new study investigates the effects of small but finite inertia on the propulsion of micro and nano-scale swimming machines July 29th, 2014

FEI adds Phase Plate Technology and Titan Halo TEM to its Structural Biology Product Portfolio: New solutions provide the high-quality imaging and contrast necessary to analyze the 3D structure of molecules and molecular complexes July 28th, 2014

Discoveries

New imaging agent provides better picture of the gut July 30th, 2014

Watching Schrödinger's cat die (or come to life): Steering quantum evolution & using probes to conduct continuous error correction in quantum computers July 30th, 2014

From Narrow to Broad July 30th, 2014

A new way to make microstructured surfaces: Method can produce strong, lightweight materials with specific surface properties July 29th, 2014

Announcements

NanoScience: Giants of the Infinitesimal July 31st, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Analytical solutions from Malvern Instruments support University of Wisconsin-Milwaukee researchers in understanding environmental effects of nanomaterials July 30th, 2014

FEI Unveils New Solutions for Faster Time-to-Analysis in Metals Research July 30th, 2014

Research partnerships

New imaging agent provides better picture of the gut July 30th, 2014

Breakthrough laser experiment reveals liquid-like motion of atoms in an ultra-cold cluster: University of Leicester research team unlocks insights into creation of new nano-materials July 25th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 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