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Updated: Jun 20, 2026
Facial Nerve Axotomy in Mice: A Model to Study Motoneuron Response to Injury
Published on: February 23, 2015
Decreased motoneuron survival in Igf2 null mice after sciatic nerve transection
Delia Silva1, Pieter Dikkes, Medina Barnes
1Endocrine Division Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
Abstract:
The search for therapeutic targets to prevent neurons from dying is ongoing and involves the exploration of a long list of neurotrophic factors. Insulin-like growth factor 2 (IGF2) is a member of the insulin family with known neurotrophic properties. In this study, we used Igf2 knockout (Igf2) neonate mice to determine whether Igf2 deficiency is detrimental to motor neuron survival after axonal injury. Results show that Igf2 neonatal mice are more susceptible to motor neuron damage than Igf2 mice, as they have a significantly lower percentage of motor neuron survival after a sciatic nerve transection. Neuronal survival was significantly improved in Igf2 mice when IGF2 was administered. These results support the role of IGF2 in neonatal motor neuron survival.
Insights
Insulin-like growth factor 2 (IGF2) is crucial for protecting neonatal motor neurons from injury-induced death. Studies show that IGF2 deficiency increases motor neuron damage, while IGF2 administration improves survival.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Neurotrophic factors are essential for neuronal survival.
- Insulin-like growth factor 2 (IGF2) exhibits neurotrophic properties.
- Understanding IGF2's role in motor neuron survival is critical for therapeutic development.
Purpose of the Study:
- To investigate the role of Insulin-like growth factor 2 (IGF2) in neonatal motor neuron survival following axonal injury.
- To determine if IGF2 deficiency exacerbates motor neuron damage.
- To assess the neuroprotective effects of IGF2 administration.
Main Methods:
- Utilized Igf2 knockout (Igf2) neonate mice models.
- Induced axonal injury via sciatic nerve transection.
- Quantified motor neuron survival rates.
- Administered IGF2 to assess its therapeutic potential.
Main Results:
- Igf2 knockout mice exhibited increased susceptibility to motor neuron damage compared to wild-type mice.
- A significantly lower percentage of motor neuron survival was observed in Igf2 deficient neonates after sciatic nerve injury.
- IGF2 administration significantly improved neuronal survival in Igf2 knockout mice.
Conclusions:
- IGF2 plays a vital role in the survival of neonatal motor neurons after axonal injury.
- IGF2 deficiency is detrimental to motor neuron survival.
- IGF2 represents a potential therapeutic target for preventing motor neuron death.
