Mt1B (Mtnr1B) Receptor Neurons is an important cell type in the neurobiology of neurodegenerative . This page provides detailed information about its structure, function, and role in disease processes.
Neurons expressing melatonin receptor 1B (MTNR1B), also known as the MT2 melatonin receptor, represent a key component of the melatonin signaling system in the brain. MTNR1B is a G protein-coupled receptor (GPCR) that binds melatonin with high affinity, playing crucial roles in circadian rhythm regulation, sleep-wake cycles, and metabolic homeostasis. These neurons are distributed across several brain regions and peripheral tissues, where they mediate melatonin's effects on circadian entrainment, glucose metabolism, and neuroprotection. [1]
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:0000197 | sensory receptor cell |
MTNR1B-expressing neurons are found in several key locations: [2]
Suprachiasmatic nucleus (SCN): The master circadian clock contains MTNR1B neurons that help synchronize circadian rhythms with the light-dark cycle. Melatonin acting through MT2 receptors in the SCN helps phase-shift circadian rhythms.
Retina: MTNR1B is expressed in retinal neurons, where it contributes to phototransduction and circadian visual processing.
Hypothalamus: MTNR1B neurons in hypothalamic regions regulate metabolic functions and sleep.
Pancreatic beta cells: MTNR1B expression in pancreatic islets links melatonin to glucose regulation.
Adipose tissue: MTNR1B in adipocytes modulates lipid metabolism and energy balance.
MTNR1B neurons play essential roles in circadian timekeeping: [3]
Phase shifting: Melatonin binding to MT2 receptors shifts circadian phase, particularly during the biological night
Sleep promotion: MTNR1B signaling enhances sleep propensity, particularly in the early night
Temperature regulation: Melatonin through MT2 receptors modulates body temperature rhythms
Hormone secretion: Coordinates rhythmic secretion of other hormones (cortisol, growth hormone)
Genetic variants in MTNR1B are associated with type 2 diabetes risk: [4]
Cell Types - All cell type pages
Circadian Rhythm
Melatonin signaling in neurodegeneration - Mechanism pathways
NCBI Gene entry
Melatonin Receptor Pharmacology - Review article
The study of Mt1B (Mtnr1B) Receptor Neurons has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying of neurodegeneration and continues to drive therapeutic development. [5]
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions. [6]
Additional evidence sources: [7]
Dubocovich et al. Melatonin receptors (2018). 2018. ↩︎
Hardeland et al. Melatonin and neurodegeneration (2019). 2019. ↩︎
Peschel et al. MTNR1B and circadian rhythms (2019). 2019. ↩︎
Benarroch, Suprachiasmatic nucleus and melatonin (2018). 2018. ↩︎
Weaver et al. Melatonin in metabolic (2020). 2020. ↩︎
Claustrat et al. Melatonin and neurological disorders (2019). 2019. ↩︎
Tosini et al. Melatonin and retinal function (2020). 2020. ↩︎