CCK Interneurons (Hippocampus)

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CCK Interneurons (Hippocampus)
Taxonomy ID
Cell Ontology (CL) [CL:0002277](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0002277)
Database ID
Cell Ontology [CL:0002277](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0002277)
Marker Expression
CB1 cannabinoid receptor High
Parvalbumin Subset
Reelin Subset
NPY Some subtypes
Synaptic release High release probability
CB1 modulation Presynaptic inhibition
Target specificity Somatic vs dendritic
Unitary conductance 1-2 nS
Approach Target
CCK agonists CCKBR
CB1 antagonists Cannabinoid
GABA modulation GABA-A
CCK gene therapy CCK expression

Overview

Cck Interneurons (Hippocampus) plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Multi-Taxonomy Classification

Taxonomy Database Cross-References

PanglaoDB Marker Cross-References

  • Unknown (PanglaoDB):

Taxonomy & Classification

PanglaoDB Marker Cross-References

  • Unknown (PanglaoDB):

Introduction

Cholecystokinin (CCK)-expressing interneurons constitute a major class of inhibitory neurons in the hippocampus that play crucial roles in regulating circuit excitability, oscillatory activity, and information processing. These cells are essential for maintaining the balance between excitation and inhibition, and their dysfunction has been implicated in various neurodegenerative diseases including Alzheimer’s disease and Parkinson’s disease1(2007)2007 · DOI 10.1016/j.neuron.2007.09.012Open reference.

Molecular Markers and Neurochemistry

Primary Markers

CCK interneurons are defined by their expression of cholecystokinin, a peptide neurotransmitter that acts on CCK receptors (CCK-A and CCK-B subtypes)2(1999)1999:

  • CCK: The defining neuropeptide marker

  • CCKAR (CCK-A receptor): Peripheral and some central expression

  • CCKBR (CCK-B receptor): Predominant in the brain

  • CKB: Brain-type creatine kinase

  • PP: Pancreatic polypeptide (subset)

  • VIP: Vasoactive intestinal peptide (subset)

Co-expression Patterns

CCK interneurons frequently co-express other neurochemical markers:

Morphological Diversity

CCK interneurons exhibit remarkable morphological heterogeneity3(2005)2005:

Basket Cells (CCK-BCs)

  • Axonal arbors densely targeting pyramidal cell somata

  • Formation of perisomatic inhibitory synapses

  • Critical for controlling pyramidal neuron output

  • Distinct from parvalbumin basket cells

Dendrite-Targeting Interneurons (CCK-DTs)

  • Axons innervating dendritic shafts and spines

  • Regulation of excitatory inputs

  • Input-specific inhibition

Schaffer Collateral-Associated Cells (SCAs)

  • Target dendritic spines on Schaffer collateral axons

  • Feedforward inhibition

  • Timing-dependent modulation

Ivy Cells

  • Neuropeptide Y co-expression

  • Slow-spiking properties

  • Dense axonal labeling in stratum lucidum

Electrophysiological Properties

CCK interneurons display diverse firing patterns4(2000)2000:

  • Adapting firing: Progressive decrease in firing rate

  • Burst-firing: Initial high-frequency burst

  • Fast-spiking: Some CCK/PV co-expressing cells

  • Low-threshold spiking: Subset with rebound properties

Synaptic Properties

Hippocampal Circuit Integration

Input Patterns

CCK interneurons receive diverse synaptic inputs:

  • Local collaterals: From CA3 and CA1 pyramidal neurons

  • Feedback inhibition: Reciprocal connections

  • Subcortical inputs: From septum and brainstem

  • Chandelier cell inputs: Interneuron-specific

Output Targets

  • CA1/CA3 pyramidal neuron somata: Basket cells

  • Dendritic shafts: Dendrite-targeting cells

  • Other interneurons: Disinhibitory circuits

  • Extrinsic targets: Entorhinal cortex, subiculum

Role in Hippocampal Oscillations

Theta Oscillations (4-12 Hz)

CCK interneurons contribute to theta rhythm generation and modulation5(2003)2003:

  • Phase-locked firing during theta

  • Entrainment of pyramidal neuron timing

  • Coordination of burst firing

  • Spatial navigation support

Gamma Oscillations (30-100 Hz)

CCK basket cells are crucial for gamma generation:

  • Synchronization of pyramidal cells

  • PING (pyramidal-interneuron gamma) mechanism

  • ASSEMBLY (interneuron network gamma)

  • Cognitive processing facilitation

Sharp Wave-Ripples (100-250 Hz)

  • CCK interneuron silencing during ripples

  • Ripple initiation mechanisms

  • Memory consolidation support

Alzheimer’s Disease Involvement

Vulnerabilities

CCK interneurons show specific vulnerabilities in AD6(2010)2010:

  • Amyloid-beta toxicity: Direct effects on CCK neurons

  • Early dysfunction: Precedes plaque formation

  • Network hyperexcitability: Loss of somatic inhibition

  • Circuit remodeling: Compensatory changes

Pathological Mechanisms

  1. Amyloid-beta effects:

    • Reduced CCK expression

    • Impaired GABA release

    • Synaptic dysfunction

  2. Tau pathology:

    • Neuronal loss in CCK populations

    • Connectivity disruption

  3. Network dysfunction:

    • Hyperexcitability

    • Seizure susceptibility

    • Memory circuit impairment

Therapeutic Implications

Parkinson’s Disease Relevance

Striatal Circuitry

CCK signaling modulates striatal function7(1999)1999:

  • DopamineCCK interactions

  • Motor control modulation

  • L-DOPA response

Dyskinesias

  • CCK involvement in L-DOPA-induced dyskinesias

  • CCK antagonist potential

Comparative Studies

Species Differences

  • Rodent CCK distribution well characterized

  • Primate studies reveal additional populations

  • Human hippocampal CCK chemistry being mapped

Developmental Expression

  • CCK expression develops postnatally

  • Critical periods for circuit formation

  • Experience-dependent plasticity

Research Methods

Identification

  • CCK-Cre driver lines

  • CCK immunostaining

  • In situ hybridization

  • Reporter mice

Functional Studies

  • Optogenetic manipulation

  • Chemogenetic silencing/activation

  • Patch-clamp electrophysiology

  • Calcium imaging

Key Publications

  1. Freund TF, Katona I. Perisomatic inhibition. Neuron. 2007

  2. Bartos M, et al. Synaptic mechanisms of synchronized gamma oscillations. Nat Rev Neurosci. 2007

  3. Palop JJ, Mucke L. Epilepsy and hyperexcitability in Alzheimer’s disease. Nat Neurosci. 2010

  4. Klausberger T, Somogyi P. Neuronal diversity and temporal dynamics. Science. 2008

  5. Cossart R. The maturation of cortical interneuron diversity. Nat Neurosci. 2014

See Also

  • [CA1 Pyramidal Neurons

  • Parvalbumin Interneurons

  • Hippocampal Interneurons](/cell-types/ca1-pyramidal-neurons --parvalbumin-interneurons --hippocampal-interneurons)

  • Alzheimer Disease

  • [GABA Signaling

  • CCK Signaling

](/mechanisms/gaba-signaling --cck-signaling)##

References

  1. (2007) Freund TF, Katona I 2007 · DOI 10.1016/j.neuron.2007.09.012
  2. (1999) Crawley JN 1999
  3. (2005) Somogyi P, Klausberger T 2005
  4. (2000) Cauli B, et al 2000
  5. (2003) Klausberger T, et al 2003
  6. (2010) Palop JJ, Mucke L 2010
  7. (1999) Gong W, et al 1999

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