PUBLICATION
NMN Deamidase Delays Wallerian Degeneration and Rescues Axonal Defects Caused by NMNAT2 Deficiency In Vivo
- Authors
- Di Stefano, M., Loreto, A., Orsomando, G., Mori, V., Zamporlini, F., Hulse, R.P., Webster, J., Donaldson, L.F., Gering, M., Raffaelli, N., Coleman, M.P., Gilley, J., Conforti, L.
- ID
- ZDB-PUB-170307-10
- Date
- 2017
- Source
- Current biology : CB 27(6): 784-794 (Journal)
- Registered Authors
- Gering, Martin
- Keywords
- NAD, NMN, NMN deamidase, NMNAT, NMNAT2, SARM1, WLD(s), Wallerian degeneration, axon degeneration, neurodegeneration
- MeSH Terms
-
- Amidohydrolases/genetics*
- Amidohydrolases/metabolism
- Animals
- Axons/pathology*
- Mice
- Mice, Transgenic
- Nerve Degeneration/genetics*
- Nerve Degeneration/metabolism
- Nicotinamide-Nucleotide Adenylyltransferase/deficiency*
- Wallerian Degeneration/genetics*
- Wallerian Degeneration/metabolism
- PubMed
- 28262487 Full text @ Curr. Biol.
Citation
Di Stefano, M., Loreto, A., Orsomando, G., Mori, V., Zamporlini, F., Hulse, R.P., Webster, J., Donaldson, L.F., Gering, M., Raffaelli, N., Coleman, M.P., Gilley, J., Conforti, L. (2017) NMN Deamidase Delays Wallerian Degeneration and Rescues Axonal Defects Caused by NMNAT2 Deficiency In Vivo. Current biology : CB. 27(6):784-794.
Abstract
Axons require the axonal NAD-synthesizing enzyme NMNAT2 to survive. Injury or genetically induced depletion of NMNAT2 triggers axonal degeneration or defective axon growth. We have previously proposed that axonal NMNAT2 primarily promotes axon survival by maintaining low levels of its substrate NMN rather than generating NAD; however, this is still debated. NMN deamidase, a bacterial enzyme, shares NMN-consuming activity with NMNAT2, but not NAD-synthesizing activity, and it delays axon degeneration in primary neuronal cultures. Here we show that NMN deamidase can also delay axon degeneration in zebrafish larvae and in transgenic mice. Like overexpressed NMNATs, NMN deamidase reduces NMN accumulation in injured mouse sciatic nerves and preserves some axons for up to three weeks, even when expressed at a low level. Remarkably, NMN deamidase also rescues axonal outgrowth and perinatal lethality in a dose-dependent manner in mice lacking NMNAT2. These data further support a pro-degenerative effect of accumulating NMN in axons in vivo. The NMN deamidase mouse will be an important tool to further probe the mechanisms underlying Wallerian degeneration and its prevention.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping