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• W1936247639 endingPage "10439" @default.
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• W1936247639 abstract "Axonal growth and neuronal rewiring facilitate functional recovery after spinal cord injury. Known interventions that promote neural repair remain limited in their functional efficacy. To understand genetic determinants of mammalian CNS axon regeneration, we completed an unbiased RNAi gene-silencing screen across most phosphatases in the genome. We identified one known and 17 previously unknown phosphatase suppressors of injury-induced CNS axon growth. Silencing Inpp5f (Sac2) leads to robust enhancement of axon regeneration and growth cone reformation. Results from cultured Inpp5f(-/-) neurons confirm lentiviral shRNA results from the screen. Consistent with the nonoverlapping substrate specificity between Inpp5f and PTEN, rapamycin does not block enhanced regeneration in Inpp5f(-/-) neurons, implicating mechanisms independent of the PI3K/AKT/mTOR pathway. Inpp5f(-/-) mice develop normally, but show enhanced anatomical and functional recovery after mid-thoracic dorsal hemisection injury. More serotonergic axons sprout and/or regenerate caudal to the lesion level, and greater numbers of corticospinal tract axons sprout rostral to the lesion. Functionally, Inpp5f-null mice exhibit enhanced recovery of motor functions in both open-field and rotarod tests. This study demonstrates the potential of an unbiased high-throughput functional screen to identify endogenous suppressors of CNS axon growth after injury, and reveals Inpp5f (Sac2) as a novel suppressor of CNS axon repair after spinal cord injury. Significance statement: The extent of axon regeneration is a critical determinant of neurological recovery from injury, and is extremely limited in the adult mammalian CNS. We describe an unbiased gene-silencing screen that uncovered novel molecules suppressing axonal regeneration. Inpp5f (Sac2) gene deletion promoted recovery from spinal cord injury with no side effects. The mechanism of action is distinct from another lipid phosphatase implicated in regeneration, PTEN. This opens new pathways for investigation in spinal cord injury research. Furthermore the screening methodology can be applied on a genome wide scale to discovery the entire set of mammalian genes contributing to axonal regeneration." @default.
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• W1936247639 date "2015-07-22" @default.
• W1936247639 modified "2023-09-26" @default.
• W1936247639 title "Gene-Silencing Screen for Mammalian Axon Regeneration Identifies Inpp5f (Sac2) as an Endogenous Suppressor of Repair after Spinal Cord Injury" @default.
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• W1936247639 doi "https://doi.org/10.1523/jneurosci.1718-15.2015" @default.
• W1936247639 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4510284" @default.
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