Vasoactive Intestinal Peptide 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.
Vasoactive Intestinal Peptide (VIP) neurons are a major class of cortical interneurons characterized by their expression of the neuropeptide VIP. These neurons play critical roles in regulating cortical circuitry, particularly in disinhibition and modulating sensory processing. VIP interneurons primarily inhibit other interneurons, creating a disinhibitory circuit that allows for focused processing of salient information.
- Cortex: Primarily layers 2/3
- Hippocampus: CA1, CA3 regions
- Thalamus: Specific relay nuclei
- Subcortical structures: Striatum, hypothalamus
- Bipolar cells: Elongated soma with two dendrites
- Bitufted cells: Two tufts of dendrites
- Axon projections: Local to other interneurons
- VIP (Vasoactive Intestinal Polypeptide): Primary marker
- Calretinin (CALB2): Often co-expressed
- Acetylcholine: May be co-released
- CCK: Sometimes co-expressed
- Late-spiking: Characteristic delayed firing
- Adaptation: Accommodation to sustained input
- Frequency: Regular spiking, moderate rates
- Accommodation: Frequency adaptation over time
- HCN channels: Prominent Ih current
- T-type calcium: Low-threshold calcium spikes
- Sodium channels: StandardNav1.2/1.6
VIP neurons primarily target other interneurons:
- Inhibit SST neurons: Reduce dendritic inhibition
- Inhibit PV neurons: Reduce somatic inhibition
- Net effect: Disinhibit pyramidal cells
- Function: Enhance signal propagation
- Attention: VIP involved in attention circuits
- Sensory processing: Modulate sensory responses
- Memory: Hippocampal VIP in memory circuits
- Arousal: VIP in cortical activation
- Theta oscillations: Phase relationship with VIP
- Gamma oscillations: Contribute to 40 Hz rhythms
- State-dependent: Changes with behavioral state
- Early changes: VIP neuron alterations
- Disinhibition: May contribute to hyperexcitability
- Circuit dysfunction: Network oscillations impaired
- Memory circuits: Hippocampal VIP disruption
- Cortical changes: VIP expression altered
- Oscillations: Beta rhythm abnormalities
- Cognitive deficits: Prefrontal cortex dysfunction
- VIP changes: May contribute to seizure activity
- Disinhibitory circuits: Uncontrolled excitation
- Therapeutic targets: VIP receptor modulators
- G protein: Gs-coupled
- Second messenger: cAMP increase
- Location: CNS neurons, glia
- Effects: Excitatory, trophic
- G protein: Gs-coupled
- Second messenger: cAMP increase
- Location: Widely expressed
- Effects: Circadian regulation
- Also binds: Pituitary adenylate cyclase-activating polypeptide (PACAP)
- G protein: Multiple (Gs, Gq)
- Effects: Trophic, neuroprotective
- VIP analogs: Treatative potential
- PACAP: Neuroprotective effects
- Receptor agonists: VPAC2 selective
- Optogenetics: Cre-driver lines
- Chemogenetics: DREADDs
- Calcium imaging: GCaMP expression
The study of Vasoactive Intestinal Peptide 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.
- [1] Bayraktar T et al. VIP-expressing interneurons in the neocortex. J Comp Neurol. 2017.
- [2] Caputi A et al. Morphology of VIP-expressing neocortical interneurons. Brain Struct Funct. 2019.
- [3] Krabbe S et al. Role of VIP neurons in cortical computation. Neuron. 2022.
- [4] Pi HJ et al. VIP interneurons disinhibit pyramidal cells. Nat Neurosci. 2013.
- [5] Pronneke A et al. VIP cell physiology and disease. Curr Opin Neurobiol. 2020.
- [6] Chen J et al. VIP and PACAP signaling in the brain. Neuropeptides. 2021.
- [7] Fu Y et al. A cortical disinhibitory circuit for enhanced sensory processing. Cell. 2023.
- [8] Mesik L et al. VIP neurons and visual processing. J Neurosci. 2022.
- [[mechanisms/neuropeptide-signaling|Neuropeptide Signaling]]
- [[cell-types/interneurons|Interneurons]]
- [[cell-types/somatostatin-neurons|Somatostatin Neurons]]
- [[diseases/alzheimers-disease|Alzheimer's Disease]]