Retinal Horizontal Cells is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Retinal horizontal cells are inhibitory interneurons located in the outer plexiform layer (OPL) of the retina. They play a crucial role in visual processing by mediating lateral inhibition, which enhances contrast, improves edge detection, and contributes to color opponency. These cells integrate signals from multiple photoreceptors and modulate the output to bipolar cells. [1]
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:0000745 | retina horizontal cell |
| Property | Details | [2]
|----------|---------| [3]
| Cell Types | H1 (axon-bearing), H2 (axonless), H3 (mixed) | [4]
| Neurotransmitters | GABA (inhibitory), sometimes Dopamine | [5]
| Marker Genes | CALB1 (calbindin), TH (tyrosine hydroxylase for H3), GAT3, GABA receptors | [6]
| Location | Outer plexiform layer (OPL), between photoreceptors and bipolar cells | [7]
| Input | Rods, Cones (via photoreceptor synapses) |
| Output | Bipolar cell dendrites, photoreceptor terminals |
Key genes expressed in horizontal cells include:
| Gene Category | Examples | Function |
|---|---|---|
| Calcium binding | CALB1 (calbindin), CR (calretinin) | Calcium buffering |
| GABAergic markers | GAD1, GAD2, GAT3 | Inhibitory transmission |
| Dopaminergic markers | TH, DAT (SLC6A3), VMAT2 | Modulation |
| Gap junction | GJA1 (Cx43), GJB2 (Cx30.2) | Electrical coupling |
| Transcription factors | LHX1, VSX1, PROX1 | Development |
The study of Retinal Horizontal Cells 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.
Masland RH. The fundamental plan of the retina. Nat Neurosci. 2001. ↩︎
Euler T, Haverkamp S, Schubert T, Baden T. Retinal bipolar cells: elementary building blocks of vision. Nat Rev Neurosci. 2014. ↩︎
Wässle H, Boycott BB. Functional architecture of the mammalian retina. Physiol Rev. 1991. ↩︎
Peichl L, González-Soriano J. Morphological types of horizontal cell in rodent retinae: a comparison of rat, mouse, hamster, and guinea pig. Vis Neurosci. 1994. ↩︎
Dacheux RF, Raviola E. The rod pathway in the rabbit retina: a depolarizing bipolar cell. J Neurosci. 1986. ↩︎
Thoreson WB, Mangel SC. Lateral interactions in the outer retina. Prog Retin Eye Res. 2012. ↩︎
Veruki ML, Wässle H. Functional architecture of the mammalian retina. Physiol Rev. 1996. ↩︎