Reelin Expressing [Neurons](/entities/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.
Overview
Reelin-expressing neurons represent a specialized population of cortical and hippocampal neurons that secrete the extracellular matrix protein Reelin. These neurons play critical roles in brain development, synaptic plasticity, and cognitive function. Reelin (RELN) is a large extracellular glycoprotein (approximately 400 kDa) that functions as a signaling molecule essential for neuronal migration, dendritic arborization, and synaptic formation during development and throughout life. [@herz2006]
Distribution in the Brain
Reelin-expressing neurons are distributed across multiple brain regions: [@tissir2003]
Cerebral Cortex
Layer 1: Most prominent Reelin expression in cortical layer 1
Layer 2/3: Scattered Reelin-positive interneurons
Layer 5-6: Subpopulations of pyramidal neurons express Reelin
Cortical Interneurons: Approximately 10-15% of cortical interneurons are Reelin-positive
Reelin Expressing [Neurons](/entities/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.
Overview
Reelin-expressing neurons represent a specialized population of cortical and hippocampal neurons that secrete the extracellular matrix protein Reelin. These neurons play critical roles in brain development, synaptic plasticity, and cognitive function. Reelin (RELN) is a large extracellular glycoprotein (approximately 400 kDa) that functions as a signaling molecule essential for neuronal migration, dendritic arborization, and synaptic formation during development and throughout life. [@herz2006]
Distribution in the Brain
Reelin-expressing neurons are distributed across multiple brain regions: [@tissir2003]
Cerebral Cortex
Layer 1: Most prominent Reelin expression in cortical layer 1
Layer 2/3: Scattered Reelin-positive interneurons
Layer 5-6: Subpopulations of pyramidal neurons express Reelin
Cortical Interneurons: Approximately 10-15% of cortical interneurons are Reelin-positive
Hippocampus
[Cortex](/brain-regions/cortex) Ammonis (CA) Region: Reelin expression in CA1-CA3 pyramidal neurons
Dentate Gyrus: Hilus neurons and some granule cells
[Entorhinal Cortex](/brain-regions/entorhinal-cortex): Strong Reelin expression in layer 2 neurons
Other Brain Regions
Cerebellum: Golgi cells in the granular layer
Brainstem: Discrete populations in the pons and medulla
Thalamus: Specific thalamic relay neurons
Hypothalamus: Several hypothalamic nuclei contain Reelin-positive neurons
Molecular Characteristics
Reelin Protein
Gene: RELN located on chromosome 7q22
Protein Structure: Contains an N-terminal signal peptide, 8 Reelin repeats (each ~350 aa), and a C-terminal region
Cleavage Products: Proteolytically cleaved into functional fragments (N-terminal, central, C-terminal)
The study of Reelin Expressing 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.