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Distinct Target-Specific Mechanisms Homeostatically Stabilize Transmission at Pre- and Post-synaptic Compartments
Pragya Goel1, Samantha Nishimura1, Karthik Chetlapalli1
1Department of Neurobiology, University of Southern California, Los Angeles, CA, United States.
Frontiers in Cellular Neuroscience
|July 18, 2020
Summary
Neurons achieve stable synaptic strength by adjusting connections to different targets. This study reveals distinct mechanisms for hypo-innervated and hyper-innervated targets, involving glutamate receptors and presynaptic release.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Neurons form connections (synapses) with various targets, each having unique requirements.
- Maintaining stable synaptic strength despite differing target demands is crucial for nervous system function.
- The mechanisms underlying target-specific homeostatic control at the Drosophila neuromuscular junction (NMJ) were previously unclear.
Purpose of the Study:
- To elucidate the distinct molecular mechanisms responsible for target-specific homeostatic control at Drosophila NMJs.
- To investigate how neurons maintain stable synaptic strength when faced with simultaneous hypo-innervation and hyper-innervation of different targets.
Main Methods:
- Utilized Drosophila neuromuscular junctions (NMJs) as a model system.
- Investigated changes in postsynaptic glutamate receptor (GluR) abundance.
- Analyzed presynaptic active zone components and neurotransmitter release probability.
- Studied the effects of postsynaptic GluR loss on presynaptic adaptations, including presynaptic homeostatic potentiation (PHP).
Main Results:
- On hypo-innervated targets, increased postsynaptic GluR abundance compensated for reduced innervation without presynaptic changes.
- On hyper-innervated targets, a decrease in presynaptic neurotransmitter release probability correlated with reduced active zone components.
- Loss of postsynaptic GluRs induced compartmentalized presynaptic homeostatic potentiation (PHP), balancing synaptic strength.
Conclusions:
- Distinct anterograde and retrograde signaling pathways operate at pre- and postsynaptic compartments.
- These pathways enable precise, target-specific homeostatic regulation of neurotransmission.
- The findings reveal sophisticated mechanisms for maintaining synaptic stability in the face of diverse target innervation patterns.
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