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SBT-272 significantly improved mitochondrial structural integrity and motility in TDP-43 mutant (A315T)-expressing upper motor neurons. These enhancements in mitochondrial health were associated with improved axon outgrowth, a key indicator of improved neuronal health. The effect of SBT-272 on axon outgrowth was superior to edaravone (approved for the treatment of ALS) and AMX0035 (NDA under FDA review). Chronic in vivo administration of SBT-272 reduced upper motor neuron degeneration and neuroinflammation in the motor cortex of the prphTDP43A315TUeGFP mouse model of ALS. Together, these data support further investigation of SBT-272 as a potential treatment for ALS with TDP-43 pathology.
“Upper motor neuron degeneration is an early event in ALS, which is characterized by degeneration of both the upper motor neurons in the brain and the lower motor neurons in the spinal cord,” said Hande Ozdinler, PhD, Associate Professor of Neurology, Feinberg School of Medicine, Northwestern University. “Therefore, to build effective treatment strategies for ALS, it is necessary for therapeutics to demonstrate efficacy on upper motor neuron health and function. The new findings presented today further strengthen the importance of improving mitochondrial health with respect to TDP-43 pathology in ALS and lay a strong foundation for the clinical development of SBT-272 for ALS patients.”
“ALS is a devastating progressive neuromuscular disease with a significant unmet medical need,” said Reenie McCarthy, Chief Executive Officer of Stealth BioTherapeutics. “We designed SBT-272 to target mitochondrial dysfunction in the brain, which is known to precede and contribute to several neurodegenerative diseases, including ALS. We are encouraged that Dr. Ozdinler’s team has elucidated these signals of neuronal protection, and we look forward to working with the ALS community to progress the clinical development of SBT-272.”
