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Tests show bright future for gadonanotubes in stem cell tracking

Date:
November 16, 2010
Source:
Rice University
Summary:
Gadonanotubes are beginning to show positive results. A new study has determined GNTs are effective in helping doctors track stems cells through the body by making them 40 times better than standard contrast agents used in magnetic resonance imaging. Contrast agents help doctors spot signs of disease or damage in MR images.
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Dark spots are aggregates of gadonanotubes (GNTs) in the cytoplasm of a mesenchymal stem cell. Tests show GNTs are highly effective for tagging and tracking stem cells through magnetic resonance imaging.
Credit: Lesa Tran/Rice University

Gadonanotubes (GNTs) developed at Rice University are beginning to show positive results in a study funded by a federal stimulus grant through the National Institutes of Health (NIH) last year.

The study has determined GNTs are effective in helping doctors track stems cells through the body by making them 40 times better than standard contrast agents used in magnetic resonance imaging. Contrast agents help doctors spot signs of disease or damage in MR images.

Researchers at Rice and the Texas Heart Institute at St. Luke's Episcopal Hospital in Houston reported in the journal Biomaterials that mesenchymal stem cells drawn from pig bone marrow labeled with GNTs are easily spotted under MRI. The technique holds promise for tracking the progress of tagged cells as they travel through a patient's body.

Ultimately, the team hopes the magnetic properties of tagged stem cells will allow doctors to manipulate them in vivo and direct cells to specific locations -- in the heart, for instance -- where they can heal damaged tissue.

GNTs are carbon nanotubes that contain gadolinium, an element commonly used in designing contrast elements for use in MRI. Though toxic, gadolinium is chelated, or chemically bound, which makes it safer for injection into the body. But clinical agents like the gadolinium-based Magnevist cannot enter cells.

However, GNTs can. Invented in the lab of Rice chemistry professor Lon Wilson in 2005, the nanotubes sequester bundles of gadolinium ions, which enhance contrast in MRIs but cannot escape their carbon cages. This makes them biologically inert and safe for tagging cells from within.

The team found GNTs did not affect the stem cells' ability to differentiate into other types of cells or to self-renew, though work continues to characterize their ability to adhere to cell scaffolds under various conditions.

Lesa Tran, a fourth-year graduate student in Wilson's lab, was the primary author of the paper, and Wilson was corresponding author. Co-authors were Rice graduate student Ramkumar Krishnamurthy; Raja Muthupillai, a senior physicist at St. Luke's; and of the Texas Heart Institute: Maria da Graça Cabreira-Hansen, a research scientist; James Willerson, president and medical director; and Emerson Perin, medical director of the Stem Cell Center.

Primary funding for the project came from the $1 million NIH Challenge Grant, with additional funding by the National Science Foundation and the Robert A. Welch Foundation.


Story Source:

The above post is reprinted from materials provided by Rice University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Lesa A. Tran, Ramkumar Krishnamurthy, Raja Muthupillai, Maria da Graça Cabreira-Hansen, James T. Willerson, Emerson C. Perin, Lon J. Wilson. Gadonanotubes as magnetic nanolabels for stem cell detection. Biomaterials, 2010; 31 (36): 9482-9491 DOI: 10.1016/j.biomaterials.2010.08.034

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Rice University. "Tests show bright future for gadonanotubes in stem cell tracking." ScienceDaily. ScienceDaily, 16 November 2010. <www.sciencedaily.com/releases/2010/11/101113165439.htm>.
Rice University. (2010, November 16). Tests show bright future for gadonanotubes in stem cell tracking. ScienceDaily. Retrieved August 30, 2015 from www.sciencedaily.com/releases/2010/11/101113165439.htm
Rice University. "Tests show bright future for gadonanotubes in stem cell tracking." ScienceDaily. www.sciencedaily.com/releases/2010/11/101113165439.htm (accessed August 30, 2015).

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