Evaluation of Neuropathological Features in the SOD1-G93A Low Copy Number Transgenic Mouse Model of Amyotrophic Lateral Sclerosis
| Autor: | Roland Rabl, Joerg Neddens, Barbara Hinteregger, Agnes Molnar-Kasza, Stefanie Flunkert, Birgit Hutter-Paier |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0301 basic medicine
Genetically modified mouse survival rate medicine.medical_specialty Neurofilament animal diseases SOD1 Neurosciences. Biological psychiatry. Neuropsychiatry neuroinflammation 03 medical and health sciences Cellular and Molecular Neuroscience body weight 0302 clinical medicine Internal medicine Spinal Cord Ventral Horn Medicine Amyotrophic lateral sclerosis Molecular Biology Neuroinflammation Original Research Glial fibrillary acidic protein biology business.industry nutritional and metabolic diseases spinal cord muscle phenotype medicine.disease Spinal cord nervous system diseases 030104 developmental biology Endocrinology medicine.anatomical_structure nervous system biology.protein muscle strength Molecular Neuroscience business 030217 neurology & neurosurgery RC321-571 |
| Zdroj: | Frontiers in Molecular Neuroscience Frontiers in Molecular Neuroscience, Vol 14 (2021) |
| ISSN: | 1662-5099 |
| Popis: | Amyotrophic lateral sclerosis (ALS) still depicts an incurable and devastating disease. Drug development efforts are mostly based on superoxide dismutase 1 gene (SOD1)-G93A mice that present a very strong and early phenotype, allowing only a short time window for intervention. An alternative mouse model is available, that is based on the same founder line but has a reduced SOD1-G93A copy number, resulting in a weaker and delayed phenotype. To be able to use these SOD1-G93A/low mice for drug testing, we performed a characterization of ALS-typical pathologies. All analyses were performed compared to non-transgenic (ntg) littermates of the same sex and age. In vivo analysis of SOD1-G93A/low mice was performed by weekly body weight measurements, analysis of the survival rate, and measurement of the muscle strength of 24–30 weeks old female and male SOD1-G93A/low mice. Immunofluorescent labeling of SOD1, glial fibrillary acidic protein (GFAP), and ionized calcium-binding adaptor molecule 1 (Iba1) protein was performed in the cervical, thoracic, and lumbar ventral horn of the spinal cord of 24–30 weeks old male and female SOD1-G93A/low mice. The musculus gastrocnemius of male SOD1-G93A/low mice was labeled with fluorophore-conjugated α-bungarotoxin and antibodies against phosphorylated neurofilaments. Fluorescent labeling was detected and quantified by macro-based image analysis. Although SOD1 protein levels were highly increased in both sexes and all age groups, levels strongly peaked in 30 weeks old male SOD1-G93A/low mice. Astrocytosis and activated microglia in the spinal cord ventral horn and phosphorylated neurofilaments in the motor unit of the musculus gastrocnemius progressively increased, while muscle strength progressively decreased in male SOD1-G93A/low mice. In female SOD1-G93A/low mice, only activated microglia increased progressively, while muscle strength was constantly reduced starting at 26 weeks. These differences result in a shorter survival time of male SOD1-G93A/low mice of about 3 weeks compared to female animals. The results suggest that male SOD1-G93A/low mice present a stronger pathology and are, therefore, better suitable to evaluate the efficacy of new drugs against ALS as most pathological features are developing progressively paralleled by a survival time that allows treatment to start before symptom onset. |
| Databáze: | OpenAIRE |
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