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Immunohistochemical Visualization of Hippocampal Neuron Activity After Spatial Learning in a Mouse Model of Neurodevelopmental Disorders

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Published on: May 12, 2015

P2X7 expression patterns in the developing Fmr1-knockout mouse hippocampus.

Matthew Napier^1,2, Ashish Kumar³, Natasha Szulist¹

¹Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada.

|September 13, 2024

Summary

Fragile-X Syndrome (FXS) involves altered P2X7 receptor expression in the developing Fmr1 KO hippocampus. This purinergic signaling change may impact neurite outgrowth and synaptic refinement in FXS mouse models.

Keywords:

P2X7 receptor development fragile X syndrome purinergic signaling

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Published on: July 6, 2022

Area of Science:

Neuroscience
Genetics
Developmental Biology

Background:

Fragile-X Syndrome (FXS) is a leading genetic cause of intellectual disability.
Hippocampus dysfunction is a key feature of FXS, but underlying mechanisms are not fully understood.
Purinergic signaling plays a role in brain development, yet its involvement in FXS is unclear.

Purpose of the Study:

To investigate the role of purinergic signaling, specifically the P2X7 receptor, in the developing hippocampus of the Fmr1 KO mouse model of FXS.
To characterize P2X7 expression patterns and cell-specific localization in the developing Fmr1 KO hippocampus.

Main Methods:

Utilized the Fmr1 KO mouse model.
Quantified P2X7 expression in whole hippocampus tissue at postnatal days 14 and 21.
Employed immunofluorescence to assess cell-specific P2X7 colocalization with neurons and microglia.
Analyzed sex-specific differences in P2X7 expression and localization.

Main Results:

P2X7 receptor expression was reduced in Fmr1 KO hippocampus tissue at P14 and P21.
P2X7 showed increased colocalization with microglia and reduced colocalization with neurons in Fmr1 KO mice.
A sex-specific reduction in neuronal P2X7 colocalization was observed in males, while females exhibited reduced absolute neuronal P2X7 expression.

Conclusions:

P2X7 receptor expression and localization are significantly altered during hippocampal development in the Fmr1 KO mouse model.
These alterations in purinergic signaling may contribute to the hippocampus dysfunction observed in FXS.
Findings highlight P2X7 as a potential target for understanding and treating FXS-related neurodevelopmental deficits.