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Updated: Jul 8, 2026
Proteomics to Identify Proteins Interacting with P2X2 Ligand-Gated Cation Channels
Published on: May 18, 2009
Cellular localization of P2X7 receptor mRNA in the rat brain
Yong Yu1, Shinya Ugawa, Takashi Ueda
1Department of Neurobiology and Anatomy, Graduate School of Medical Sciences, Nagoya City University, Nagoya 467-8601, Japan. yuyong@med.nagoya-cu.ac.jp
Abstract:
P2X7 receptor is a member of the P2X family of ATP-gated ion channels. The cellular localization of P2X7 receptors in the central nervous system remains controversial because immunohistochemical staining patterns are inconsistent among antibodies. Here we examined the precise distribution of P2X7 mRNAs in the rat brain using isotopic in situ hybridization. P2X7-positive glial-like small cells were sporadically scattered in almost all areas of the brain. P2X7-positive glial-like small cells were also observed in nerve fiber tracts such as the anterior commissure, corpus callosum (CC), optic tract, and internal capsule. P2X7-positive neurons were found in the anterior olfactory nucleus, cerebral cortex, piriform cortex (Pir), lateral septal nucleus (LS), hippocampal pyramidal cell layers of CA1, CA3, CA4, pontine nuclei, external cuneate nucleus, and medial vestibular nucleus. P2X7 hybridization signals were also observed in the motor neurons of the trigeminal motor nucleus, facial nucleus, hypoglossal nucleus, and the anterior horn of the spinal cord. P2X7 mRNA was expressed in the ependymal cells around the olfactory ventricle, lateral ventricles (LV), third ventricle (3V), cerebral aqueduct (Aq), fourth ventricle (4V), and central canal. The P2X7 hybridization signal was also very strong in the area postrema (AP). The double staining experiments demonstrate that neurons, oligodendrocytes, and microglia expressed P2X7 receptor mRNAs. These findings suggest that P2X7 receptors may play a variety of roles in a wide range of cell types in the brain.
Insights
The P2X7 receptor, an ATP-gated ion channel, is precisely mapped in the rat brain. This study reveals its widespread expression across neurons, glial cells, and ependymal cells, suggesting diverse brain functions.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- The P2X7 receptor is part of the P2X family of ATP-gated ion channels.
- Its exact cellular localization in the central nervous system is debated due to inconsistent immunohistochemical findings.
Purpose of the Study:
- To precisely determine the distribution of P2X7 receptor messenger RNA (mRNA) in the rat brain.
- To clarify the cellular expression patterns of P2X7 receptors in various brain regions and cell types.
Main Methods:
- Isotopic in situ hybridization was employed to visualize P2X7 mRNA distribution.
- Double staining experiments were conducted to confirm co-expression in specific cell types.
Main Results:
- P2X7 mRNA was detected in glial-like cells throughout the brain, nerve fiber tracts, and specific neuronal populations.
- Expression was also observed in motor neurons, ependymal cells lining ventricles, and the area postrema.
- Double staining confirmed P2X7 mRNA expression in neurons, oligodendrocytes, and microglia.
Conclusions:
- P2X7 receptors are expressed in a diverse array of cell types within the rat brain, including neurons and glial cells.
- The widespread distribution suggests multifaceted roles for P2X7 receptors in central nervous system function.
- This detailed mapping provides a foundation for understanding P2X7 receptor involvement in neurological processes.
