Periglomerular Cells is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Periglomerular (PG) cells are inhibitory interneurons located in the glomerular layer of the olfactory bulb, where they play crucial roles in processing olfactory sensory information. These small GABAergic neurons form synaptic connections with olfactory sensory neuron terminals, mitral/tufted cell dendrites, and other periglomerular cells, creating a sophisticated inhibitory network that modulates odor discrimination. [1]
Morphology and Markers: PG cells have small cell bodies (5-10 μm diameter) with dendrites that remain confined within a single glomerulus. They express tyrosine hydroxylase (TH), calretinin, and GABA as primary markers. [2]
Function: [3]
Disease Relevance: [4]
Periglomerular cells are inhibitory interneurons located in the glomerular layer of the olfactory bulb, where they play critical roles in odor processing and signal modulation. [5]
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:1001435 | periglomerular cell |
| Database | ID | Name | Confidence | [6]
|----------|----|------|------------|
| Cell Ontology | CL:1001435 | periglomerular cell | Exact |
| Attribute | Value |
|---|---|
| Cell Type Name | Periglomerular Cells |
| Lineage | GABAergic neuron > Olfactory bulb interneuron |
| Marker Genes | TH, CALB1, NPY, SST, CR |
| Brain Regions | Olfactory bulb glomerular layer |
| Allen Atlas ID | Various (glomerular layer) |
Periglomerular cells are small, dendritically compact neurons with dendrites that ramify within a single glomerulus. They express tyrosine hydroxylase (TH), calbindin (CALB1), and various neuropeptides including neuropeptide Y (NPY) and somatostatin (SST). These cells receive input from olfactory sensory neuron axons and modulate the excitatory flow to mitral and tufted cells.
Periglomerular cells serve as the first line of inhibitory processing in the olfactory bulb. Their primary functions include:
Periglomerular cells show early vulnerability in neurodegenerative diseases:
Single-cell transcriptomic studies (Allen Brain Atlas) identify periglomerular cells as a distinct population expressing:
The olfactory bulb represents a potential window for early diagnosis and therapeutic intervention:
The study of Periglomerular Cells 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.
Doty RL (2012). Olfaction in Parkinson's disease and related disorders. Neurobiol Dis. 2012. ↩︎
Talamini LM, et al. (2019). Acta Neuropathol Commun. 2019. ↩︎