NMJ Regeneration Signal Quiz
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Questions and Answers

What is the function of presynaptic boutons?

  • Store neurotransmitters in synaptic vesicles (correct)
  • Clustering of ion channels
  • Anchor postsynaptic receptors
  • Regulate synapse function
  • What is the role of presynaptic active zones?

  • Contain electron dense proteins
  • Anchor postsynaptic receptors
  • Regulate synapse function
  • Fuse with synaptic vesicles (correct)
  • Which component of the synapse is involved in clustering postsynaptic receptors and ion channels at high density?

  • Presynaptic bouton
  • Presynaptic active zone
  • Synaptic cleft
  • Postsynaptic density (correct)
  • What is the specialized content of the synaptic cleft?

    <p>Synaptic extracellular matrix</p> Signup and view all the answers

    During which phase of synapse formation does target selection occur?

    <p>Phase 1: Target selection</p> Signup and view all the answers

    Which drug specifically inhibits action potentials by blocking sodium channels that depolarize neurons?

    <p>Tetrodotoxin</p> Signup and view all the answers

    What is the role of the postsynaptic denisity (PSD) in a synapse?

    <p>Regulate synapse function</p> Signup and view all the answers

    How do drugs like tetrodotoxin typically affect the first phase of synapse formation?

    <p>Have no effect on target selection</p> Signup and view all the answers

    Which phase of synapse formation involves remodeling the initial course distribution of synaptic connections?

    <p>Address selection phase.</p> Signup and view all the answers

    What is the role of Agrin in neuromuscular junctions?

    <p>Induces clustering of AChRs in cultured myotubes</p> Signup and view all the answers

    What happens in MuSK knockout mice?

    <p>AChRs do not properly localize</p> Signup and view all the answers

    Which molecule is an intracellular adaptor protein for AChRs?

    <p>Rapsyn</p> Signup and view all the answers

    What is the main excitatory neurotransmitter in CNS synapses?

    <p>Glutamate</p> Signup and view all the answers

    Which synapses can be axo-dendritic, axo-somatic, or axo-axonic?

    <p>CNS synapses</p> Signup and view all the answers

    What is the function of netrin-1 in synapses?

    <p>Recruits AMPA-Rs to synapses</p> Signup and view all the answers

    Which molecule promotes excitatory glutamatergic synapse formation when overexpressed in cortex neurons?

    <p>SynCAM</p> Signup and view all the answers

    What is a key difference between CNS and PNS synapses in terms of neurotransmitter release?

    <p>CNS requires transmitter release from multiple synapses to depolarize the post-synaptic neuron, while PNS does not.</p> Signup and view all the answers

    In what way does Rapsyn knockout mice phenotype differ from MuSK knockout mice phenotype?

    <p>Both exhibit severe lack of clustering.</p> Signup and view all the answers

    What is the role of the intracellular domain of cadherins in synaptic terminals?

    <p>Binds to actin</p> Signup and view all the answers

    What is the role of Ephrins in axon guidance?

    <p>They repel the axons of neurons expressing the corresponding receptor</p> Signup and view all the answers

    What effect does disrupting cadherins have on synaptic function?

    <p>Reduces PSD95 complex clustering</p> Signup and view all the answers

    What is the primary neurotransmitter at the mammalian Neuromuscular Junction (NMJ)?

    <p>Acetylcholine</p> Signup and view all the answers

    What change in AChR subunits occurs after innervation of myotubes?

    <p>A shift from delta to epsilon subunits</p> Signup and view all the answers

    In knockout mice lacking gephrin, what is the impact on post-synaptic clustering?

    <p>No post-synaptic clustering occurs</p> Signup and view all the answers

    What is the function of heterophilic synaptic adhesion molecules like beta-neurexin and neuroligin?

    <p>Link pre- and post-synapse sides</p> Signup and view all the answers

    What triggers the differentiation of both presynaptic and post-synaptic elements during synapse formation?

    <p>Recognition of the target and adhesive interaction</p> Signup and view all the answers

    What is the role of PDZ domains in synaptic organization?

    <p>Cluster ion channels at the post-synapse</p> Signup and view all the answers

    Which protein activates the receptor tyrosine kinase erbB on the post-synaptic membrane of myotubes?

    <p>Neuregulin (Nr)</p> Signup and view all the answers

    Which proteins contain PDZ domains involved in synaptic function?

    <p>PSD95, Cask, ZO-3</p> Signup and view all the answers

    What is one of the mechanisms that contribute to AChR clustering?

    <p>Redistribution of existing receptors in the plane of the membrane</p> Signup and view all the answers

    What does experiment A, denervating a mature NMJ, suggest about AChR clustering?

    <p>A nerve is required for AChR clustering to occur</p> Signup and view all the answers

    What is the role of the active zones in synaptic terminals?

    <p>Anchor synaptic vesicles</p> Signup and view all the answers

    What is the proposed function of a presynaptic active zone precursor vesicle?

    <p>Facilitating the formation of active zones</p> Signup and view all the answers

    What are Ephrins and Eph receptors responsible for directing?

    <p>Innervation of the tectum</p> Signup and view all the answers

    What is one outcome of synapse formation involving recognition and adhesive interaction?

    <p>Enhanced gene transcription in synaptic nuclei</p> Signup and view all the answers

    How do CNS neurons differ in response compared to NMJ neurons?

    <p>They cluster different types of receptors.</p> Signup and view all the answers

    What is the effect of expressing neuroligin by a non-neuronal cell on an axon that contacts it?

    <p>Triggers presynaptic differentiation.</p> Signup and view all the answers

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