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Cochlear Implantation in the Guinea Pig
Published on: June 15, 2018
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Intrauterine Growth Restriction Affects Cerebellar Granule Cells in the Developing Guinea Pig Brain
Mary Tolcos1,2,3, Annie McDougall1,2,4, Amy Shields1
1The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.
Developmental Neuroscience
|May 16, 2018
Summary
Intrauterine growth restriction (IUGR) does not appear to affect cerebellar granule cell proliferation but does alter their migration and impacts Purkinje cell development, potentially affecting cerebellar function.
Area of Science:
- Neuroscience
- Developmental Biology
- Obstetrics
Background:
- Intrauterine growth restriction (IUGR) can lead to adverse neurodevelopmental outcomes.
- The specific effects of IUGR on cerebellar development remain incompletely understood.
- Cerebellar granule cell proliferation and migration are critical for cerebellar growth.
Purpose of the Study:
- To investigate if IUGR, induced by chronic placental insufficiency (CPI) in guinea pigs, causes abnormal cerebellar development.
- To assess potential deficits in cerebellar granule cell proliferation and/or migration due to IUGR.
- To examine the impact of IUGR on Purkinje cell development.
Main Methods:
- Chronic placental insufficiency (CPI) induced via unilateral uterine artery ligation in guinea pigs.
- Comparison of growth-restricted (GR) and control fetuses/neonates at 52 days gestation, 60 days gestation, and 1 week postnatal age.
- Histological analysis of cerebellar layers (EGL, IGL, molecular layer) and cell markers (Ki67, p27).
Main Results:
- No significant difference in external granular layer (EGL) width or internal granular layer (IGL) area at 52 days gestation.
- At 60 days gestation, GR fetuses showed increased EGL width, decreased IGL area, and increased postmitotic granule cells in the EGL.
- GR neonates exhibited increased granule cell density and migration in the molecular layer, alongside reduced Purkinje cell size.
Conclusions:
- IUGR does not appear to impair cerebellar granule cell proliferation.
- IUGR alters the normal migration of granule cells to the IGL and affects Purkinje cell development.
- These cerebellar alterations in IUGR may have implications for postnatal neurodevelopment and function.
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