Qian Wang at work among plants that host some of the building blocks of his nanomolecular scaffolds.
By Steven Powell, spowell2@mailbox.sc.edu, 803-777-1923
If you break a bone, you know you'll end up in a cast for weeks. But what if the time it took to heal a break could be cut in half? Or cut to just a tenth of the time it takes now? Qian Wang, a chemistry professor at the University of South Carolina, has made tantalizing progress toward that goal.
Wang, Andrew Lee and co-workers just reported in Molecular Pharmaceutics that surfaces coated with bionanoparticles could greatly accelerate the early phases of bone growth. Their coatings, based in part on genetically modified Tobacco mosaic virus, reduced the amount of time it took to convert stem cells into bone nodules from two weeks to just two days.
The key to hastening bone healing or growth is to coax a perfectly natural process to pick up the pace.
"If you break a rib, or a finger, the healing is automatic," said Wang. "You need to get the bones aligned to be sure it works as well as possible, but then nature takes over."
Healing is indeed very natural. The human body continuously generates and circulates cells that are undifferentiated; that is, they can be converted into the components of a range of tissues, such as skin or muscle or bone, depending on what the body needs.
The conversion of these cells called stem cells is set into motion by external cues. In bone healing, the body senses the break at the cellular level and begins converting stem cells into new bone cells at the location of the break, bonding the fracture back into a single unit. The process is very slow, which is helpful in allowing a fracture to be properly set, but after that point the wait is at least an inconvenience, and in some cases highly detrimental.
"With a broken femur, a leg, you can be really incapacitated for a long time," said Wang. "In cases like that, they sometimes inject a protein-based drug, BMP-2, which is very effective in speeding up the healing process. Unfortunately, it's very expensive and can also have some side effects."
In a search for alternatives four years ago, Wang and colleagues uncovered some unexpected accelerants of bone growth: plant viruses. They originally meant for these viruses, which are harmless to humans, to work as controls. They coated glass surfaces with uniform coverings of the Turnip yellow mosaic virus and Tobacco mosaic virus, originally intending to use them as starting points for examining other potential variations.
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