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Altered dendritic morphology of MEC II pyramidal and stellate cells in Rett syndrome mice
Manigandan Krishnan1, Ayishal B Mydeen2, Mohammed M Nakhal2
1Department of Pediatrics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates.
Introduction:
Mutations in the methyl-CpG-binding protein-2 gene (MECP2), which cause Rett syndrome (RTT), disrupt neuronal activity; however, the impact of the MECP2 loss-of-function on the cytoarchitecture of medial entorhinal cortex layer II (MECII) neurons-crucial for spatial memory and learning-remains poorly understood.
Methods:
In this study, we utilized Golgi staining and neuron tracing in the Mecp2+/- mouse model of RTT to investigate the pyramidal and stellate cell alterations in MECII.
Results And Discussion:
Our findings revealed that pyramidal cells displayed a significant reduction in apical dendritic length, soma size, and spine density, while basal dendrites showed increased dendritic complexity and branching. On the other hand, stellate cells exhibited dendritic hypertrophy along with increased soma size, primary dendrites, and localized increase in dendritic intersections, despite an overall reduction in total dendritic length and spine density. These findings underscore the notion that MECP2 loss-of-function can disrupt MECII pyramidal and stellate cell cytoarchitecture in a cell-type-specific manner, emphasizing its critical role in maintaining proper dendritic morphology in circuits, which is crucial for learning and memory.
Insights
Loss of MECP2 function in Rett syndrome alters neuron structure in the brain's memory center. Pyramidal and stellate cells show distinct changes, impacting spatial learning and memory circuits.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Mutations in the methyl-CpG-binding protein-2 (MECP2) gene cause Rett syndrome (RTT).
- MECP2 loss-of-function disrupts neuronal activity, but its effects on medial entorhinal cortex layer II (MECII) cytoarchitecture are unclear.
- MECII neurons are critical for spatial memory and learning.
Purpose of the Study:
- To investigate the impact of MECP2 loss-of-function on MECII pyramidal and stellate cell cytoarchitecture in a mouse model of RTT.
Main Methods:
- Utilized Golgi staining and neuron tracing techniques.
- Examined the Mecp2+/- mouse model of RTT.
Main Results:
- Pyramidal cells showed reduced apical dendritic length, soma size, and spine density, but increased basal dendritic complexity.
- Stellate cells exhibited dendritic hypertrophy, increased soma size, and primary dendrites, with reduced overall dendritic length and spine density.
Conclusions:
- MECP2 loss-of-function induces cell-type-specific cytoarchitectural disruptions in MECII neurons.
- These morphological changes highlight MECP2's crucial role in maintaining dendritic morphology essential for learning and memory circuits.
