CNS 1 Flashcards
Name two ways neurotransmitter action is terminated.
Enzymatic Degradation or Reuptake
What effect does an excitatory nt have?
Activates post-synaptic receptors –> increase in Na+ ( and Ca2+) permeability–>membrane depolarization
What effect does an inhibitory nt have?
Activates post-synaptic receptors –> increase in Cl- permeability–>membrane depolarization.
When will IPSP not occur?
At rest since membrane is already at equilibrium.
How are the amino acids glutamate, GABA, and glycine removed from the presynaptic terminal?
through re-uptake by a transporter
How is acetylcholine removed from the presynaptic terminal?
By Acetylcholinesterase
Only choline is taken back up by a transporter into presynaptic neuron.
Name the transporter that coincides with each nt:
GABA, Dopamine, Serotonin, NE, Glutamate
GABA- GAT Dopamine - DAT Serotonin- SERT NE- NET Glutamate- EAAT
What special cell is used to convert glutamate to glutamine before re-uptake into presynaptic neuron?
Glial cell
Once NE, Serotonin, DA are taken back up in presynaptic cell, what two things can happen?
1) repacked by VMAT2
2) Degraded by MAO
precursor of GABA is what and what vitamin is needed for synthesis?
glutamate, Vit B6
Name the repackaging enzyme that coincides with each nt:
GABA, Dopamine, Serotonin, NE, Glycine
GABA- VGAT DA- VMAT2 Serotonin- VMAT2 NE- VMAT2 Glycine- VIAAT
Where do neurotransmitters bind on direct receptors?
Directly to receptor
Where do neurotransmitters bind on indirect receptors?
Typically bind G-protein that causes opening of ion channel downstream.
What three steps in GPCR signal cascade causes signal amplification?
1) Receptor- Gprotein
2) 2nd Messenger
3) Protein Kinase phosphorylation of target proteins
What type of receptor are Cholinergic Nicotinic receptors?
Direct (Ion Channel)
