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Insulin-like growth factor-I mitigates motor coordination deficits associated with neonatal alcohol exposure in rats
Nancy N H McGough1, Jennifer D Thomas, Hector D Dominguez
1Department of Psychology, San Diego State University, San Diego, CA 92120, USA.
Insights
Insulin-like growth factor-I (IGF-I) partially reversed behavioral deficits from prenatal alcohol exposure in rats. This neuroprotective factor improved motor coordination, offering potential interventions for fetal alcohol spectrum disorders.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Prenatal alcohol exposure (PAE) significantly impacts fetal brain development, causing behavioral issues like hyperactivity and motor deficits.
- Fetal alcohol syndrome rates remain high despite warnings, necessitating effective interventions against alcohol's teratogenic effects.
- Insulin-like growth factor-I (IGF-I) demonstrates neuroprotective properties and aids white matter development following various insults.
Purpose of the Study:
- To investigate the potential of IGF-I in mitigating behavioral deficits induced by developmental alcohol exposure.
- To assess IGF-I's efficacy in addressing cell death and white matter abnormalities caused by PAE.
Main Methods:
- Sprague-Dawley rat pups were administered ethanol or sham intubations during a critical brain development period (postnatal days 4-9).
- Following ethanol exposure, rats received daily intranasal IGF-I or a placebo from postnatal days 10-13.
- Behavioral assessments included open field activity, parallel bar motor coordination, and Morris maze spatial learning tests.
Main Results:
- Ethanol exposure resulted in hyperactivity, impaired motor coordination, and spatial learning deficits.
- IGF-I treatment significantly improved motor coordination in ethanol-exposed rats.
- IGF-I did not significantly mitigate the hyperactivity or spatial learning deficits.
Conclusions:
- IGF-I shows promise as a potential therapeutic agent for specific neurodevelopmental consequences of prenatal alcohol exposure, particularly motor deficits.
- Further research is warranted to explore IGF-I's broader therapeutic potential for fetal alcohol spectrum disorders.
- These findings have implications for developing interventions for children affected by prenatal alcohol exposure.
Abstract:
Prenatal alcohol exposure can affect brain development, leading to behavioral problems, including overactivity, motor dysfunction and learning deficits. Despite warnings about the effects of drinking during pregnancy, rates of fetal alcohol syndrome remain unchanged and thus, there is an urgent need to identify interventions that reduce the severity of alcohol's teratogenic effects. Insulin-like growth factor-I (IGF-I) is neuroprotective against ethanol-related toxicity and promotes white matter production following a number of insults. Given that prenatal alcohol leads to cell death and white matter deficits, the present study examined whether IGF-I could reduce the severity of behavioral deficits associated with developmental alcohol exposure. Sprague-Dawley rat pups received ethanol intubations (5.25 g/kg/day) or sham intubations on postnatal days (PD) 4-9, a period of brain development equivalent to the third trimester. On PD 10-13, subjects from each treatment received 0 or 10 microg IGF-I intranasally each day. Subjects were then tested on a series of behavioral tasks including open field activity (PD 18-21), parallel bar motor coordination (PD 30-32) and Morris maze spatial learning (PD 45-52). Ethanol exposure produced overactivity, motor coordination impairments, and spatial learning deficits. IGF-I treatment significantly mitigated ethanol's effects on motor coordination, but not on the other two behavioral tasks. These data indicate that IGF-I may be a potential treatment for some of ethanol's damaging effects, a finding that has important implications for children of women who drink alcohol during pregnancy.
