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Malonate and 3-nitropropionic acid neurotoxicity are reduced in transgenic mice expressing a caspase-1
O A Andreassen1, R J Ferrante, D B Hughes
1Neurochemistry Laboratory, Neurology Service, Massachusetts General Hospital and Harvard Medical School, Boston, USA.
Abstract:
Increasing evidence implicates caspase-1-mediated cell death as a major mechanism of neuronal death in neurodegenerative diseases. In the present study we investigated the role of caspase-1 in neurotoxic experimental animal models of Huntington's disease (HD) by examining whether transgenic mice expressing a caspase-1 dominant-negative mutant are resistant to malonate and 3-nitropropionic acid (3-NP) neurotoxicity. Intrastriatal injection of malonate resulted in significantly smaller striatal lesions in mutant caspase-1 mice than those observed in littermate control mice. Caspase-1 was significantly activated following malonate intrastriatal administration in control mice but significantly attenuated in mutant caspase-1 mice. Systemic 3-NP treatment induced selective striatal lesions that were significantly smaller within mutant caspase-1 mice than in littermate control mice. These results provide further evidence of a functional role for caspase-1 in both malonate- and 3-NP-mediated neurotoxin models of HD.
Insights
Caspase-1 plays a key role in neuronal death in neurodegenerative diseases like Huntington's disease (HD). Transgenic mice with inhibited caspase-1 showed reduced neurotoxicity in HD models, suggesting a therapeutic target.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Neuroinflammation and programmed cell death are implicated in neurodegenerative diseases.
- Caspase-1 activation is increasingly recognized as a critical mediator of neuronal death.
- Huntington's disease (HD) pathogenesis involves significant neurodegeneration.
Purpose of the Study:
- To investigate the role of caspase-1 in neurotoxicity relevant to Huntington's disease.
- To determine if inhibiting caspase-1 activity confers neuroprotection in animal models of HD.
Main Methods:
- Utilized transgenic mice expressing a dominant-negative caspase-1 mutant.
- Administered intrastriatal malonate and systemic 3-nitropropionic acid (3-NP) to induce neurotoxicity.
- Assessed lesion size and caspase-1 activation in the striatum.
Main Results:
- Mutant caspase-1 mice exhibited significantly smaller striatal lesions after malonate injection compared to controls.
- Malonate administration led to significant caspase-1 activation in control mice, but this was attenuated in mutant mice.
- Systemic 3-NP treatment also resulted in smaller striatal lesions in mutant caspase-1 mice.
Conclusions:
- Caspase-1 plays a functional role in malonate- and 3-NP-induced neurotoxicity.
- Inhibition of caspase-1 provides neuroprotection in experimental models of Huntington's disease.
- Targeting caspase-1 may be a viable therapeutic strategy for HD and related neurodegenerative conditions.