Cck A (Cckar) Neurons 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.
Neurons expressing the cholecystokinin A receptor (CCKAR) represent a significant population in both the peripheral and central nervous systems. CCKAR, also known as CCK-A receptor, is a G-protein coupled receptor that binds cholecystokinin (CCK) peptides with high affinity [1]. These neurons play crucial roles in anxiety regulation, memory formation, satiety signaling, and pancreatic function. CCKAR is distinct from the CCK-B receptor (CCKBR) in its distribution and function, with CCKAR primarily expressed in peripheral tissues and select brain regions.
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:0002277 | type I enteroendocrine cell |
| Database | ID | Name | Confidence |
|---|---|---|---|
| Cell Ontology | CL:0002277 | type I enteroendocrine cell | Exact |
The CCKAR gene is located on chromosome 4p15.2 in humans and encodes a 406-amino acid G-protein coupled receptor [2]. The receptor protein contains:
CCKAR binds multiple forms of cholecystokinin:
CCKAR activates multiple intracellular signaling cascades:
CCKAR-expressing neurons are found in several brain regions:
| Brain Region | Expression Level | Function |
|---|---|---|
| Cortex | Moderate | Cognitive processing |
| Hippocampus | High | Memory, anxiety |
| Amygdala | High | Emotion regulation |
| Hypothalamus | Moderate | Satiety, homeostasis |
| Brainstem | Variable | Visceral functions |
CCKAR is highly expressed in:
CCKAR neurons in the amygdala and hippocampus play a key role in anxiety:
CCKAR in the cortex and hippocampus modulates memory processes:
In the hypothalamus, CCKAR neurons regulate appetite:
In the pancreas, CCKAR regulates digestive enzyme secretion:
CCKAR dysfunction is increasingly recognized in Alzheimer's disease:
CCK System Changes:
Relationship with Amyloid:
Therapeutic Potential:
The CCK system may be affected in Parkinson's disease:
Given CCKAR's role in anxiety:
Potential Applications:
Clinical Use:
Development Status:
The study of Cck A (Cckar) 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.
Dufresne, M., et al. (2006). Cholecystokinin and gastrin receptors. Physiological Reviews, 86(3), 805-847. 2006. ↩︎
Bower, R.L., et al. (2018). CCK receptor signaling: From neuropsychiatry to cancer. Trends in Pharmacological Sciences, 39(8), 721-735. 2018. ↩︎
Meyer-Lindenberg, A., et al. (1997). Cholecystokinin in the cerebrospinal fluid: decreased concentrations in patients with Alzheimer's disease. Journal of Neural Transmission, 104(4-5), 457-464. 1997. ↩︎