Summary: A new treatment that uses extracellular vesicles filled with exosomes derived from human stem cells could help repair brain damage following stroke, researchers report.
Source: University of Georgia.
A team of researchers at the University of Georgia’s Regenerative Bioscience Center and ArunA Biomedical, a UGA startup company, have developed a new treatment for stroke that reduces brain damage and accelerates the brain’s natural healing tendencies in animal models. They published their findings in the journal Translational Stroke Research.
The research team led by UGA professor Steven Stice and Nasrul Hoda of Augusta University created a treatment called AB126 using extracellular vesicles (EV), fluid-filled structures known as exosomes, which are generated from human neural stem cells.
Fully able to cloak itself within the bloodstream, this type of regenerative EV therapy appears to be the most promising in overcoming the limitations of many cell therapies—with the ability for exosomes to carry and deliver multiple doses—as well as the ability to store and administer treatment. Small in size, the tiny tubular shape of an exosome allows EV therapy to cross barriers that cells cannot.
“This is truly exciting evidence, because exosomes provide a stealth-like characteristic, invisible even to the body’s own defenses,” said Stice, Georgia Research Alliance Eminent Scholar and D.W. Brooks Distinguished Professor in the College of Agricultural and Environmental Sciences. “When packaged with therapeutics, these treatments can actually change cell progression and improve functional recovery.”
Following the administration of AB126, the researchers used MRI scans to measure brain atrophy rates in preclinical, age-matched stroke models, which showed an approximately 35 percent decrease in the size of injury and 50 percent reduction in brain tissue loss—something not observed acutely in previous studies of exosome treatment for stroke.
Outside of rodents, the results were replicated by Franklin West, associate professor of animal and dairy science, and fellow RBC members using a porcine model of stroke—the only one of its kind in the U.S.
Based on these pre-clinical results, ArunA Biomedical plans to begin human studies in 2019, said Stice, who is also chief scientific officer of ArunA Biomedical.
“Until now, we had very little evidence specific to neural exosome treatment and the ability to improve motor function,” said Stice. “Just days after stroke, we saw better mobility, improved balance and measurable behavioral benefits in treated animal models.”
Named as part of the ‘stroke belt’ region, Georgia continues to exceed the national average in stroke deaths, which is the third leading cause of death in the U.S., with more than 140,000 Americans dying each year, according to the Centers for Disease Control and Prevention.
ArunA recently unveiled advances to the company’s proprietary neural cell platform for the production of exosome manufacturing. Today, ArunA’s manufacturing process positions the company to produce AB126 exosomes at a scale to meet early clinical demand. The company has plans to expand this initiative beyond stroke for preclinical studies in epilepsy, traumatic brain and spinal cord injuries later this year.
Researchers also plan to leverage collaborations with other institutions through the National Science Foundation Engineering Research Center for Cell Manufacturing Technologies, based at the Georgia Institute of Technology and supported by $20 million in NSF funding.
Stice, the UGA lead for CMaT, and industry partners like ArunA Biomedical, will develop tools and technologies for the consistent and low-cost production of high-quality living therapeutic cells that could revolutionize treatment for stroke, cancer, heart disease and other disorders.
About this neuroscience research article
Funding: Funding was supported by ArunA Biomedical, Inc., and R.L.S. was partially supported by the Science and Technology Center Emergent Behaviors of Integrated Cellular Systems (EBICS) Grant No. CBET-0939511.
[cbtabs][cbtab title=”MLA”]University of Georgia “Stem Cell Based Stroke Treatment Repairs Brain Tissue.” NeuroscienceNews. NeuroscienceNews, 17 February 2018. <https://neurosciencenews.com/stem-cell-stoke-brain-repair-8511/>.[/cbtab][cbtab title=”APA”]University of Georgia (2018, February 17). Stem Cell Based Stroke Treatment Repairs Brain Tissue. NeuroscienceNews. Retrieved February 17, 2018 from https://neurosciencenews.com/stem-cell-stoke-brain-repair-8511/[/cbtab][cbtab title=”Chicago”]University of Georgia “Stem Cell Based Stroke Treatment Repairs Brain Tissue.” https://neurosciencenews.com/stem-cell-stoke-brain-repair-8511/ (accessed February 17, 2018).[/cbtab][/cbtabs]
Human Neural Stem Cell Extracellular Vesicles Improve Tissue and Functional Recovery in the Murine Thromboembolic Stroke Model
Over 700 drugs have failed in stroke clinical trials, an unprecedented rate thought to be attributed in part to limited and isolated testing often solely in “young” rodent models and focusing on a single secondary injury mechanism. Here, extracellular vesicles (EVs), nanometer-sized cell signaling particles, were tested in a mouse thromboembolic (TE) stroke model. Neural stem cell (NSC) and mesenchymal stem cell (MSC) EVs derived from the same pluripotent stem cell (PSC) line were evaluated for changes in infarct volume as well as sensorimotor function. NSC EVs improved cellular, tissue, and functional outcomes in middle-aged rodents, whereas MSC EVs were less effective. Acute differences in lesion volume following NSC EV treatment were corroborated by MRI in 18-month-old aged rodents. NSC EV treatment has a positive effect on motor function in the aged rodent as indicated by beam walk, instances of foot faults, and strength evaluated by hanging wire test. Increased time with a novel object also indicated that NSC EVs improved episodic memory formation in the rodent. The therapeutic effect of NSC EVs appears to be mediated by altering the systemic immune response. These data strongly support further preclinical development of a NSC EV-based stroke therapy and warrant their testing in combination with FDA-approved stroke therapies.