Vomeronasal 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.
Vomeronasal Neurons (Vomeronasal Sensory Neurons, VSNs) are specialized chemosensory neurons located in the vomeronasal organ (VNO), also known as Jacobson's organ. They detect pheromones and other chemical signals that mediate social and sexual behaviors in many vertebrates. In humans, the vomeronasal system is largely vestigial but may retain some functionality.
- Location: Vomeronasal organ (VNO), located in the nasal septum
- Cell Types:
- Apical VSNs (express V1R receptors, Gi-protein)
- Basal VSNs (express V2R receptors, G(o)-protein)
- Molecular Markers:
- Vomeronasal receptors (V1Rs, V2Rs)
- TRPC2 ion channel (main transduction channel)
- G(alpha)i2, G(alpha)o (G-protein subunits)
- Olfactory marker protein (OMP)
- Cyclic nucleotide-gated channel (CNGA2)
- Morphology: Bipolar neurons with microvilli projecting into the vomeronasal lumen
The vomeronasal system detects:
- Pheromones: Social and sexual signaling molecules
- Major urinary proteins (MUPs): Individual recognition signals
- Sulfated steroids: Stress and reproductive state indicators
- Environmental chemosignals: Territory marking, prey detection
Signal transduction involves:
- Vomeronasal receptor activation
- G-protein dissociation (Gi/Go)
- TRPC2 channel opening
- Ca²⁺ influx and depolarization
- Signal transmission to accessory olfactory bulb
Neural Pathways:
- VNO → Accessory olfactory bulb (AOB)
- AOB → Medial amygdala → Hypothalamus
- AOB → Cortical amygdala →piriform cortex
- Olfactory dysfunction: Often precedes motor symptoms by years
- Vomeronasal involvement: May contribute to altered social behavior and smell-taste interactions
- Lewy pathology: α-Synuclein can affect olfactory and vomeronasal pathways early
- Clinical correlation: Olfactory/gustatory testing used for early PD diagnosis
- Olfactory system vulnerability: Early involvement of olfactory pathways
- Possible VNO changes: Some studies show degeneration in AD
- ** Tau pathology**: May affect central vomeronasal pathways
- Schizophrenia: Altered pheromone processing may contribute to social cognition deficits
- Autism Spectrum Disorders: Vomeronasal system dysfunction potentially involved
- Rodents: Highly developed vomeronasal system essential for social behavior
- Primates: Reduced system, vestigial in humans
- Humans: Functional remnants may exist; controversial
- V1R family: ~150 functional genes (apical)
- V2R family: ~100 functional genes (basal)
- Accessory olfactory bulb mitral cells
- Amygdala projection neurons
- Hypothalamic neuroendocrine cells
- Olfactory training: May help compensate for vomeronasal dysfunction
- Pheromone therapy: Experimental for social behavior disorders
- Neurodegeneration monitoring: Olfactory testing as early biomarker
The study of Vomeronasal 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.
- Dulac C, Axel R. (1995). A novel family of genes encoding putative pheromone receptors in mammals. Cell. PMID:7606735
- Herrada G, Dulac C. (1997). A novel family of putative pheromone receptors with independent specificity in the vomeronasal organ. Cell. PMID:9192865
- Zufall F, Leinders-Zufall T. (2000). The cellular and molecular basis of odor and pheromone sensing in mammals. Cell Mol Life Sci. PMID:11077917
- Brennan PA, Zufall F. (2006). Pheromonal communication in vertebrates. Nature. PMID:17167477
- Doty RL. (2012). Olfaction and taste in Parkinson's disease. Handb Clin Neurol. PMID:23146936
- Hawkes CH. (2006). Olfaction in neurodegenerative disorders. Adv Otorhinolaryngol. PMID:16583048
- Meredith M. (1991). Vomeronasal产量 in mammals. Prog Neurobiol. PMID:1947199
- Tirindelli R, et al. (2009). From pheromones to behavior. Physiol Rev. PMID:19515916