Islands Of Calleja (Ic) 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.
The Islands of Calleja (Islands of Calleja) are clusters of granule cells located within the ventral striatum, primarily in the olfactory tubercle. These small clusters of neurons form part of the ventral pallidum and are critically involved in reward processing, motivation, and olfactory-guided behavior. [1]
| Property | Value | [2]
|----------|-------| [3]
| Cell Type Name | Islands of Calleja (Ic) Neurons | [4]
| Allen Atlas ID | N/A (ventral striatal structure) | [5]
| Lineage | GABAergic medium spiny neuron | [6]
| Brain Region | Ventral Striatum / Olfactory Tubercle | [7]
| Primary Neurotransmitter | GABA |
| Marker Genes | CALB1, DRD1, DRD2, MOR1 |
| Database | ID | Name | Confidence |
|---|---|---|---|
| Cell Ontology | CL:4030053 | Islands of Calleja granule cell | Medium |
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:4030053 | Islands of Calleja granule cell |
Islands of Calleja neurons are characterized by:
The Islands of Calleja function as a hedonic hotspot in the ventral striatum:
Key differentially expressed genes in Ic neurons include:
| Gene | Expression | Function |
|---|---|---|
| DRD1 | High | D1 dopamine receptor, reward signaling |
| DRD2 | Moderate | D2 dopamine receptor, reward modulation |
| CALB1 | High | Calbindin, calcium buffering |
| MOR1 | High | Mu-opioid receptor, hedonic coding |
| PENK | Moderate | Proenkephalin, opioid peptide |
| PDYN | Moderate | Prodynorphin, reward peptides |
Dopamine Modulators: D1/D2 agonists for reward dysfunction
Opioid Agents: Kappa opioid antagonists (buprenorphine) for anhedonia
Olfactory Training: May help preserve Ic function in early AD/PD
Retina
Photoreceptor Cells
Bipolar Cells
Retinal Ganglion Cells
Visual Pathway
Age-Related Macular Degeneration
The study of Islands Of Calleja (Ic) 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.
Ikemoto S. Brain reward circuitry beyond the mesolimbic dopamine system: a neurobiological theory. 2010. ↩︎
Pecina S, Berridge KC. Hedonic hot spot in nucleus accumbens shell: where do mu-opioids cause increased hedonic impact? J Neurosci. 2005. ↩︎
Zhang Y, et al. Islands of Calleja: a target for deep brain stimulation in depression and addiction. 2021. ↩︎
Wesson DW, Wilson DA. Sniffing out the contributions of the olfactory tubercle to the sense of smell. 2011. ↩︎
Gardner EL. Addiction and brain reward and antireward pathways. 2011. ↩︎
Haber SN, Knutson B. The reward circuit: linking primate anatomy and human imaging. 2010. ↩︎
Morales M, Pickel VM. Insights to drug addiction derived from ultrastructural views of the mesocorticolimbic circuitry. 2012. ↩︎