Nanoparticle Treatments Show Promise for Spinal Cord Injury Recovery

Research Overview

A recent study conducted at the University of Michigan has revealed how nanoparticle treatments may significantly reduce the damage caused by spinal cord injuries in mice. When trauma occurs, immune cells rush to the affected area to initiate the healing process. Typically, neurons within the brain and spinal cord are shielded from the peripheral immune response. However, spinal cord injuries disrupt this barrier, allowing immune cells to enter and trigger inflammation around delicate neural tissues.

Impact of Inflammation

This inflammatory response is detrimental, as it can lead to neuron death and the formation of scar tissue, which hampers regeneration and results in a loss of function below the injury site.

Development of Nanoparticles

In an effort to counteract these effects, researchers at the University of Michigan have engineered nanoparticles aimed at redirecting immune activity and minimizing inflammation while promoting tissue regeneration. In their experiments, these nanoparticles were injected intravenously into mice, where they integrated into immune cells, effectively reprogramming them to alter their distribution and functionality.

Results of the Study

The reprogramming of immune cells led to a remarkable four-fold decrease in the number of these cells at the injury site, which in turn lowered the expression of genes that stimulate inflammation. Concurrently, the expression of anti-inflammatory and regeneration-promoting genetic factors increased. Furthermore, the amount of scarring was reduced by a factor of three, enabling the treated mice to exhibit superior motor function compared to their untreated counterparts.

Future Applications

The potential applications for this innovative technology are extensive. The researchers are optimistic that the development of these nanoparticles could pave the way for new treatments not only for spinal cord injuries but also for various inflammatory diseases, including multiple sclerosis. Their findings have been published in the Proceedings of the National Academy of Sciences of the United States of America.

References

Park J et al. Intravascular innate immune cells reprogrammed via intravenous nanoparticles to promote functional recovery after spinal cord injury. Proc Natl Acad Sci U S A. 2019 Jul 8. pii: 201820276. doi: 10.1073/pnas.1820276116. [Epub ahead of print]
University of Michigan. An ‘EpiPen’ for spinal cord injuries. EurekAlert! https://www.eurekalert.org/pub_releases/2019-07/uom-af071119.php.
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