Biotech News: CD47 Antibody treatment shrinks or eliminates human cancer tumors

Nanoparticles, CD47, Stanford University

Artificial protein fragment could allow nanobeads to transport drugs where they're needed. A group of US researchers have discovered that small man-made peptides can help to sneak drug-bearing nanobeads past the ever-vigilant immune system. 
To work successfully, drugs and imaging agents need to get to the diseased cells or tumors where they’re needed most. Although researchers are developing nanoparticles that help to deliver drugs to the right place, all therapeutic molecules face a deadly foe — the immune system. Its macrophages are intended to spot any intruding molecules in the blood and destroy them in a process called phagocytosis.

Researchers at the University of Pennsylvania in Philadelphia have now found a way to stop macrophages from destroying drug-bearing nanoparticles. They’ve designed and made a small segment of a crucial membrane protein called CD47, which is recognized by macrophages as being safe. Which means that molecules that contain CD47 can get past macrophages and into blood cells.  Similar Stanford University studies have shown comparable results, see video below. Biophysicist Dennis Discher, who led the work, says that he was inspired when he saw another group's work describing the structure of CD47. “I saw a minimal part of CD47 we could take out and make,” he says. This was the part of CD47 that attaches to a macrophage receptor protein, allowing the macrophage to let the protein, and its cargo, into the cell the macrophage is guarding. The work of Discher and his team is published today in Science.

Through the barricades

Using computer simulations to make sure that the CD47 fragment was folded correctly and was stable, the group designed and made a 21-amino-acid peptide based on the fragment. They then stuck the peptide to commercially available polystyrene nanobeads. The beads also carried a dye (or fluorophores) that showed up under fluorescence spectroscopy. The beads were injected into mice along with the same amount of other beads tagged with a different color fluorophores but not the peptide. After half an hour, the mouse blood had four times as many beads with the peptide fragment than the other bead, showing that many more of the peptide-tagged beads had got past the macrophage defense. The team then looked at mice with tumors and saw that the peptide-tagged, fluorescent nanobeads accumulated in the tumors. Nanoparticles tend to accumulate in tumors because of the tumor’s haphazard structure and leaky blood vessels. The nanoparticles spill through these blood vessels and get stuck in the tumor.

Buoyed by the evidence that the peptide-carrying nanobeads were circulating in the blood, Discher and his team also tagged their nanobeads with the anticancer drug paclitaxel. They saw that their peptide-carrying system shrank tumors just as well as the standard paclitaxel carrier, Cremophor, but without that carrier's toxic side effects. Neil Barclay of the University of Oxford, UK, was part of the team that worked out the CD47 structure that inspired Discher’s work. “It’s neat,” he says of Discher’s research. “It’s a new way of trying to get the immune system to prevent phagocytosis of drugs or particles.” Discher hopes that the system can be improved with custom-made nanobeads, rather than being limited to the off-the-shelf ones he and his team used. “We want to make this accessible and reproducible,” he says.

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