NeuroscienceLesson 1 of 2 in the course Neurotransmitters and neuromodulation

Dopamine: Chemistry, Signaling, Pathways, and Clinical Roles

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

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Summary

Dopamine is a chemical messenger with important roles in the brain and throughout the body. This lesson introduces its chemical identity, molecular structure, and the processes that produce and break it down.

Dopamine (DA) is a neuromodulatory molecule and, in the brain, a neurotransmitter: a chemical released by neurons to communicate with other cells. Chemically, it belongs to the catecholamine and phenethylamine families. It is the simplest catecholamine; norepinephrine and epinephrine are related molecules.

All flashcards

How is dopamine classified chemically?
It is an organic amine in the catecholamine and phenethylamine families, and the simplest catecholamine.
What is dopamine hydrochloride?
A salt form commonly supplied for pharmaceutical and laboratory use.
Which related molecule can cross the blood–brain barrier when dopamine cannot?
L-DOPA can cross the barrier and be converted into dopamine in the brain.
What is peripheral dopamine's common local signaling role?
It often acts as a paracrine messenger, affecting cells near the cell that releases it.
Why is intravenous dopamine generally given by continuous infusion?
Its plasma half-life in adults is around one minute.

Quiz questions

  1. Which receptors belong to the D2-like dopamine receptor family?Answer: D2, D3, and D4
  2. What is VMAT2's role in dopamine signaling?Answer: It transports dopamine from the cytosol into secretory vesicles.
  3. What distinguishes phasic dopamine transmission?Answer: Brief, event-related release driven by action potentials
  4. Which brain regions are connected by the nigrostriatal pathway?Answer: Substantia nigra pars compacta and dorsal striatum
  5. In incentive-salience theory, which process is dopamine especially linked to?Answer: Wanting, or motivational approach

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

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