NeuroscienceLesson 3 of 5 in the course Neurotransmitters and neuromodulation

Serotonin: Synthesis, Signaling, Physiology, and Drug Actions

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Serotonin is a signaling molecule with roles in the brain, digestive tract, blood, and other tissues. This lesson introduces its names, sources, major functions, and basic chemistry.

Serotonin, also called 5-hydroxytryptamine (5-HT), is a monoamine neurotransmitter and neuromodulator. It participates in mood, cognition, reward, learning, memory, appetite, sleep, and many processes outside the nervous system. Its effects vary with the receptors and tissues involved, so serotonin does not have one universal action.

All flashcards

What does 5-HT denote?
5-hydroxytryptamine, another chemical name for serotonin.
How do TPH1 and TPH2 differ?
TPH1 occurs in several tissues; TPH2 is neuron-specific.
What distinguishes the 5-HT3 receptor from most serotonin receptors?
5-HT3 is a ligand-gated ion channel; most others are GPCRs.
How do SSRIs affect serotonin signaling?
They inhibit SERT, reducing serotonin reuptake into presynaptic cells.
Why can serotonin produce different effects in different tissues?
Effects depend on receptor subtype, tissue, concentration, and local conditions.

Quiz questions

  1. How do monoamine oxidase inhibitors affect serotonin?Answer: They reduce its breakdown by inhibiting monoamine oxidase.
  2. Which enzyme catalyzes serotonylation of protein glutamine residues?Answer: Transglutaminase 2 (TGM2)
  3. Many serotonergic psychedelics produce characteristic effects primarily by activating which receptor?Answer: 5-HT2A
  4. Which serotonin-targeting drug class is used to treat migraine by activating selected 5-HT1 receptors?Answer: Triptans
  5. Why are 5-HT3 receptor antagonists used as antiemetics?Answer: They can reduce serotonin-mediated stimulation of vomiting pathways.

Based on the Wikipedia article Serotonin, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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