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DCC/netrin-1 regulates cell death in oligodendrocytes after brain injury
Madelen M Díaz1, Yanina Tsenkina1, Dena Arizanovska1
1The Miami Project to Cure Paralysis, Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, FL, USA.
Abstract:
Hallmark pathological features of brain trauma are axonal degeneration and demyelination because myelin-producing oligodendrocytes (OLs) are particularly vulnerable to injury-induced death signals. To reveal mechanisms responsible for this OL loss, we examined a novel class of "death receptors" called dependence receptors (DepRs). DepRs initiate pro-death signals in the absence of their respective ligand(s), yet little is known about their role after injury. Here, we investigated whether the deleted in colorectal cancer (DCC) DepR contributes to OL loss after brain injury. We found that administration of its netrin-1 ligand is sufficient to block OL cell death. We also show that upon acute injury, DCC is upregulated while netrin-1 is downregulated in perilesional tissues. Moreover, after genetically silencing pro-death activity using DCCD1290N mutant mice, we observed greater OL survival, greater myelin integrity, and improved motor function. Our findings uncover a novel role for the netrin-1/DCC pathway in regulating OL loss in the traumatically injured brain.
Insights
Brain trauma causes oligodendrocyte (OL) death. The netrin-1/deleted in colorectal cancer (DCC) pathway regulates this loss, offering a potential therapeutic target for improving myelin repair and motor function after injury.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Traumatic brain injury (TBI) leads to axonal degeneration and demyelination.
- Oligodendrocytes (OLs), responsible for myelin production, are highly vulnerable to injury-induced death signals.
- Dependence receptors (DepRs) are a class of receptors that initiate pro-death signaling in the absence of their ligands, but their role in TBI is largely unknown.
Purpose of the Study:
- To investigate the role of the deleted in colorectal cancer (DCC) dependence receptor in oligodendrocyte loss following brain injury.
- To explore the therapeutic potential of the netrin-1/DCC pathway in mitigating TBI-induced OL death and promoting myelin repair.
Main Methods:
- Examined the expression of DCC and its ligand netrin-1 in perilesional tissues after acute brain injury.
- Administered netrin-1 to assess its effect on OL cell death.
- Utilized DCCD1290N mutant mice with silenced pro-death activity to evaluate OL survival, myelin integrity, and motor function post-injury.
Main Results:
- Netrin-1 administration effectively blocked oligodendrocyte cell death.
- DCC expression was upregulated, while netrin-1 expression was downregulated in injured brain tissues.
- Genetic silencing of DCC's pro-death activity in mutant mice resulted in increased OL survival, preserved myelin integrity, and improved motor function.
Conclusions:
- The netrin-1/DCC pathway plays a critical role in regulating oligodendrocyte loss after traumatic brain injury.
- Targeting this pathway presents a novel therapeutic strategy for enhancing recovery and functional outcomes in TBI patients.
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