Neuropeptide receptor
A neuropeptide receptor is a type of G protein-coupled receptor that binds neuropeptides—small, protein-like molecules used by neurons to communicate.
Neuropeptides differ from classical neurotransmitters in several key ways:
- active at much lower concentrations
- bind their receptors with higher affinity
- synthesized as large inactive precursors that undergo complex processing.
An example is the μ-opioid receptor, which binds to and is activated by the neuropeptide β-endorphin.
Physiological roles
Neuropeptide receptors play a role in a variety of physiological processes:- Neuronal Circuit Regulation – Modulate excitatory/inhibitory balance. Enhance synaptic plasticity and memory.
- Sensory Processing – Mediate pain, temperature, and auditory signals. Integrate multisensory information for adaptive behaviors.
- Immune and Inflammatory Modulation – Pro-inflammatory activation. Anti-inflammatory effects.
- Metabolic and Endocrine Regulation – Regulate appetite and energy balance. Facilitate communication between the brain, gut, and liver.
- Neuroprotection and Neurodegeneration – Protect neurons in stroke, epilepsy, and Alzheimer’s. Impact processes in diseases like Parkinson’s and Huntington’s.
- Pain and Stress Response – Opioid receptors mediate analgesia and stress. Non-classical receptors modulate opioid peptide functions.
- Behavioral and Emotional Regulation – Influence social bonding, fear, addiction, and anxiety.