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Home > Press > Novel Quantum Dot-Based Technique Sees 100 Different Molecules in a Single Cell

Abstract:
Better diagnosis and treatment of cancer could hinge on the ability to rapidly map out networks of dozens of molecules in individual tumor cells. New research from the University of Washington offers a more comprehensive way of analyzing a single cell's unique behavior and could reveal patterns that indicate why a cell will or will not become malignant.

Novel Quantum Dot-Based Technique Sees 100 Different Molecules in a Single Cell

Bethesda, MD | Posted on July 15th, 2013

Xiaohu Gua and graduate student Pavel Zrazhevskiy have used an array of distinctly colored quantum dots to illuminate 100 biomarkers, a ten-fold increase from the current research standard, to help analyze individual cells from cultures or tissue biopsies. The investigators published their findings in the journal Nature Communications.

While other approaches have measured multiple biomarkers in a single cell, what makes this technique so promising is that it reuses the same precious tissue sample in a cyclical process to measure 100 biomolecules in groups of ten. The process starts by pairing a commercially available antibody that is known to bind with specific biomolecule with a quantum dot of distinct size and therefore color. The investigators then inject a solution of ten of these antibody-quantum dot pairs onto a tissue sample and use a fluorescence microscope to quantify which of the constructs bind at the single cell level.

Once the measurement is complete, they then wash the tissue sample with a fluid of detergents at low pH to get rid of the antibodies and quantum dots without degrading the tissue sample. The two investigators have shown that they can repeat this process at least ten times without producing any signs of tissue damage.

The researchers note that because this methodology uses commercially available enzymes and standard fluorescence microscopes, it is relatively low cost. They also plan to automate the procedure using microfluidics and automated image processing technologies.

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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)

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View open access full paper - “Quantum dot imaging platform for single-cell molecular profiling.”

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