Adoptive immunotherapy involves extracting a patient's blood so that the number of naturally occurring T cells (a type of white blood cell) can reproduce more effectively in the laboratory. Although the body produces its own tumor-fighting T cells, they are often suppressed by the tumor and are too few to be effective.
Scientists boost the production of T cells outside the body using different substances that encourage T cell antigens to cluster in high concentrations. The better these substances are at clustering T cell antigens, the greater the immune cell proliferation. Once enough T cells are produced, the blood is transferred back into the patient's body.
The Yale team had previously reported the unexpected effect that carbon nanotubes had on T cell production. They found that the antigens, when presented on the surface of the nanotubes, stimulated T cell response far more effectively than coating other substrates such as polystyrene in the antigens, even though the total amount of antigens used remained the same.
Now they have discovered the reason behind the increased stimulation. They found that the antigens cluster in high concentrations around the tiny defects found in the carbon nanotubes.
"Carbon nanotube bundles resemble a lymph node microenvironment, which has a labyrinth sort of geometry," said Tarek Fahmy, associate professor of chemical engineering and biomedical engineering at Yale and senior author of the paper. "The nanotube bundles seem to mimic the physiology and adsorb more antigens, promoting a greater immunological response."
Current adoptive immunotherapy takes weeks to produce enough T cells, but lab tests showed that the nanotubes produced the same T cell concentration in just one-third the time, Fahmy said.
Carbon nanotubes can cause problems, such as an embolism, when used in the body. But this isn't the case when they are used in blood that has been extracted from the patient, Fahmy said. Next, the team will work on a way to effectively remove the carbon nanotubes from the blood before it is returned to the patient.
"We think this is a really interesting use of carbon nanotubes. It's a way to exploit the unique properties of this material for biological application in a safe way."
Other authors of the paper include lead author Tarek Fadel, Michael Look, Peter Staffier, Gary Haller and Lisa Pfefferle, all of the Yale School of Engineering & Applied Science.
Suzanne Taylor Muzzin | EurekAlert!
Working the switches for axon branching
26.09.2018 | Max-Planck-Institut für Biochemie
Diversity in the brain – How millions of neurons become unique
26.09.2018 | Universität Basel
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This is a joint press release of University Muenster and Heidelberg as well as the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt.
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A study in the journal Bulletin of Marine Science describes a new, blood-red species of octocoral found in Panama. The species in the genus Thesea was discovered in the threatened low-light reef environment on Hannibal Bank, 60 kilometers off mainland Pacific Panama, by researchers at the Smithsonian Tropical Research Institute in Panama (STRI) and the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) at the University of Costa Rica.
Scientists established the new species, Thesea dalioi, by comparing its physical traits, such as branch thickness and the bright red colony color, with the...
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