Hippocampal Dentate Gyrus Mossy Cells V2 is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Hippocampal dentate gyrus mossy cells are a unique neuronal population in the dentate gyrus that play critical roles in hippocampal circuitry, memory encoding, and are vulnerable in neurodegenerative diseases.
Mossy cells are large glutamatergic neurons located in the hilus (polymorphic layer) of the dentate gyrus. They receive inputs from dentate granule cell axons (mossy fibers) and project back to granule cells and interneurons, forming a powerful excitatory feedback circuit.
¶ Location and Morphology
- Cell body: Located in the hilus/polymorphic layer of the dentate gyrus
- Dendrites: Highly spiny, extending into the molecular layer
- Axon: Large, thin unmyelinated axons (mossy fibers) that project to CA3 pyramidal neurons
- Synaptic contacts: Receive mossy fiber inputs from granule cells, project to granule cells and interneurons
- Input: Dentate granule cell mossy fibers
- Output: CA3 pyramidal neurons (via mossy fibers), granule cells, interneurons
- Feedback: Forms excitatory feedback loop with granule cells
- Calcium-binding proteins: Calretinin (primary marker), calbindin
- Transcription factors: Prox1, NeuroD1, Pax6
- Receptors: NMDA receptors, AMPA receptors, mGluR5
- Neuropeptides: Dynorphin, substance P
- Gain control: Regulate excitability of dentate granule cells
- Pattern separation: Contribute to orthogonalization of similar memory representations
- Feedforward inhibition: Coordinate activity between granule cells and interneurons
- Memory encoding: Support hippocampal-dependent learning and memory
- Firing pattern: Regular spiking, adapting
- Resting membrane potential: ~-65 mV
- Input resistance: High (~150 MΩ)
- Action potential threshold: ~-50 mV
- Mossy cells are vulnerable in early AD
- Loss correlates with memory deficits
- May contribute to hippocampal hyperexcitability
- Target for therapeutic intervention
- Mossy cell loss is a hallmark of hippocampal sclerosis
- Contributes to aberrant sprouting of granule cell axons
- Promotes epileptogenesis
- Vulnerable to excitotoxic damage
- Loss contributes to cognitive deficits
- Neuroprotective agents: Prevent mossy cell death
- Cell replacement: Stem cell-based therapies
- Modulation: Enhance mossy cell function to improve memory
The study of Hippocampal Dentate Gyrus Mossy Cells V2 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.
- Scharfman, H.E. The mossy cell population. (1991)
- Amaral, D.G. et al. Organization of CA3a neurons in the rat hippocampus. (2007)
- Jinde et al. Hilar mossy cell degeneration in temporal lobe epilepsy. (2012)
- Yuan, J. et al. Mossy cells in aging and AD. (2017)