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The Preparation of Oblique Spinal Cord Slices for Ventral Root Stimulation
Published on: October 13, 2016
Combined Neuroprotective Effects of N,N-Dimethyltryptamine and Ventral Root Reimplantation Following Spinal Root
Paola Andrea Caro Aponte1, Edison Huertas Montoya2, Italo O Mazali2
1Laboratory of Nerve Regeneration, University of Campinas (IB/UNICAMP), Campinas, Brazil.
Abstract:
Currently, no effective treatment exists for injuries at the interface between the CNS/PNS, largely due to their complex pathophysiology and the limited efficacy of single-target therapies. To address this challenge, we investigated a novel combinatorial therapeutic strategy integrating surgical VRR with fibrin sealant biopolymer (FSB) and DMT in a rat model of ventral root avulsion VRA. DMT was extracted from Mimosa tenuiflora roots and structurally characterized using standard analytical methods. Adult female Lewis rats underwent unilateral L4-L6 VRA and received daily DMT treatment (1, 2.5, or 5 mg/kg; i.p) for 2 weeks to determine the optimal therapeutic dose. Subsequently, the identified optimal DMT dose was combined with VRR, and animals were evaluated 2 weeks post-injury. Outcome measures encompassed quantitative assessments of neuronal survival, glial reactivity, synaptic preservation, and differential gene expression of neurotrophic factors (GDNF, FGF-2, VGF-A) and anti-apoptotic genes (Bcl-2, Bcl-XL). Extracted DMT met all structural and analytical criteria for experimental use. Proximal axotomy led to substantial MN loss (78%), accompanied by pronounced glial reactivity and synaptic detachment. DMT at 1 mg/kg yielded the strongest neuroprotective profile, significantly enhancing MN survival, reducing glial reactivity, and preserving pre-synaptic boutons. Notably, these effects were further potentiated when DMT treatment was combined with VRR. Moreover, the combined VRR + DMT therapy significantly upregulated GDNF expression, indicating a synergistic effect on neurotrophic support. Overall, our findings suggest that DMT is a promising neuroprotective agent for treating MN degeneration following CNS/PNS interface injuries, particularly when integrated into a combinatorial therapeutic strategy.
Insights
A novel combinatorial therapy using Mimosa tenuiflora extract (DMT) and ventral root repair (VRR) shows promise for treating central and peripheral nervous system injuries. This approach significantly enhances neuronal survival and neurotrophic support, offering new hope for nerve regeneration.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Pharmacology
Background:
- Injuries at the CNS/PNS interface lack effective treatments due to complex pathophysiology and limited single-target therapy efficacy.
- Ventral root avulsion (VRA) causes significant motor neuron (MN) loss and synaptic dysfunction.
- Developing combinatorial strategies is crucial for addressing these complex neural injuries.
Purpose of the Study:
- To investigate a novel combinatorial therapeutic strategy integrating surgical ventral root repair (VRR) with fibrin sealant biopolymer (FSB) and Mimosa tenuiflora extract (DMT) in a rat model of VRA.
- To determine the optimal therapeutic dose of DMT for neuroprotection.
- To evaluate the synergistic effects of combined VRR and DMT therapy on neuronal survival and gene expression.
Main Methods:
- Adult female Lewis rats underwent unilateral L4-L6 VRA.
- DMT was extracted from Mimosa tenuiflora roots and administered daily (1, 2.5, or 5 mg/kg; i.p.) for 2 weeks to determine the optimal dose.
- The optimal DMT dose was combined with VRR, with evaluations conducted 2 weeks post-injury.
- Outcome measures included neuronal survival, glial reactivity, synaptic preservation, and gene expression of neurotrophic and anti-apoptotic factors.
Main Results:
- DMT at 1 mg/kg demonstrated significant neuroprotection, enhancing MN survival, reducing glial reactivity, and preserving pre-synaptic boutons.
- The combination of VRR and DMT therapy further potentiated these neuroprotective effects.
- Combined VRR + DMT therapy significantly upregulated GDNF expression, indicating synergistic neurotrophic support.
Conclusions:
- DMT exhibits promising neuroprotective properties for treating motor neuron degeneration following CNS/PNS interface injuries.
- Combinatorial therapy integrating DMT with VRR offers enhanced therapeutic benefits for nerve regeneration.
- This strategy holds potential for developing more effective treatments for complex neural injuries.
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