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Updated: Jan 28, 2026
08:55
Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
Published on: August 7, 2018
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Axonal Degeneration Is Mediated by Necroptosis Activation.
Macarena S Arrázola1,2, Cristian Saquel1, Romina J Catalán1
1Center for Integrative Biology, Faculty of Sciences, Universidad Mayor de Chile, Santiago, Chile 8580745.
Summary
Axonal degeneration, a cause of functional impairment, is driven by necroptosis, a programmed cell-death pathway. Inhibiting RIPK1 kinase with necrostatin-1 delays degeneration and protects axons in the peripheral nervous system and CNS.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Axonal degeneration contributes to functional impairment in nervous system disorders.
- An integrative signaling pathway for axonal degeneration remains unidentified.
- Necroptosis, a regulated cell-death mechanism, is implicated in neurodegenerative diseases.
Purpose of the Study:
- To investigate the involvement of necroptosis in axonal degeneration.
- To identify a novel therapeutic target for neuroprotection.
Main Methods:
- Pharmacological inhibition of RIPK1 kinase using necrostatin-1.
- Genetic knock-down of RIPK3 and MLKL (Mixed Lineage Kinase Domain-Like).
- In vitro and in vivo studies in wild-type mice, including mechanical and toxic insults.
Main Results:
- Necrostatin-1 significantly delayed axonal degeneration in both peripheral nervous system and CNS.
- Genetic inhibition of RIPK3 and MLKL also protected axons.
- RIPK1 inhibition prevented mitochondrial fragmentation and reduced axonal loss.
- Electrophysiological analysis confirmed delayed functional loss in axons.
Conclusions:
- Axonal degeneration is mediated by the necroptotic programmed cell-death pathway.
- This identifies a novel mechanistic framework for therapeutic interventions in neurodegenerative conditions.
- Targeting necroptosis offers potential therapeutic strategies for nervous system disorders.
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