| Globus Pallidus externa (GPe) Neurons | |
|---|---|
| Allen Atlas ID | CS202210140_3528 |
| Lineage | Neuron > GABAergic > Basal ganglia indirect pathway |
| Markers | GAD1, GAD2, PPP1R1B, NPY, PV |
| Brain Regions | Globus pallidus externa |
| Disease Vulnerability | [Parkinson's Disease](/diseases/parkinsons-disease), [Huntington's Disease](/diseases/huntingtons) |
Globus Pallidus Externa (Gpe) Neurons is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Globus Pallidus externa (GPe) Neurons are a specialized cell type classified within the Neuron > GABAergic > Basal ganglia indirect pathway lineage. These cells are primarily found in Globus pallidus externa and are characterized by expression of marker genes including GAD1, GAD2, PPP1R1B, NPY. They are selectively vulnerable in Parkinson's Disease, Huntington's Disease.
Globus Pallidus externa (GPe) Neurons are identified by the expression of the following key marker genes:
These markers are used for immunohistochemical identification and single-cell RNA sequencing classification, as catalogued in the Allen Cell Type Atlas.
Globus Pallidus externa (GPe) Neurons play essential roles in neural circuits and brain function. They are found in the following brain regions:
Their normal functions include maintaining neural circuit integrity, signal processing, and contributing to the homeostasis of their local microenvironment.
Globus Pallidus externa (GPe) Neurons show selective vulnerability in the following neurodegenerative conditions:
The selective vulnerability of these cells is an active area of research, with factors including metabolic demands, calcium handling, exposure to toxic protein aggregates, and cell-autonomous gene expression programs contributing to their susceptibility.
Single-cell and single-nucleus RNA sequencing studies have revealed the transcriptomic signature of Globus Pallidus externa (GPe) Neurons. Key differentially expressed genes from the Allen Cell Type Atlas and related datasets include the marker genes listed above. These transcriptomic profiles help identify subtypes and disease-associated gene expression changes.
The study of Globus Pallidus Externa (Gpe) Neurons has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
The external segment of the globus pallidus (GPe) is a central hub in the basal ganglia indirect pathway. In Parkinson's disease, decreased dopaminergic inhibition leads to abnormal GPe activity that contributes to motor dysfunction[1].
In the PD state:
Dystonia is associated with altered GPe activity. Reduced GPe output leads to excessive thalamocortical drive and abnormal movements. GPe-DBS has shown efficacy in treating dystonia[3].
GPe neurons express:
The GPe receives input from:
The GPe provides output to:
GPe stimulation is effective for both PD and dystonia, often with fewer side effects than GPi stimulation[4].
Dopaminergic medications indirectly modulate GPe activity through their effects on striatal neurons[5].
Bugalho J, Lang M, Maia A, et al. Globus pallidus external segment deep brain stimulation for Parkinson's disease. Neurology India. 2012. ↩︎
Bevan MD, Magill PJ, Terman D, et al. Move to the rhythm: oscillations in the subthalamic nucleus-external globus pallidus network. Trends in Neurosciences. 2002. ↩︎
Huebl J, Brücke C, Merkl A, et al. Processing of emotional stimuli is reflected by modulations in beta band activity in the subthalamic nucleus. Neuroimage. 2015. ↩︎
Liu Y, Li W, Cao J, et al. Effects of globus pallidus externus stimulation in Parkinson's disease: a systematic review. Frontiers in Neurology. 2023. ↩︎
Corbit VL, Tran P, Sharma S, et al. Cell-type-specific influences of parkinsonism on external globus pallidus neurons. Brain. 2016. ↩︎