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Updated: Jun 13, 2026
08:06
Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
Published on: September 3, 2014
Selected SALM (synaptic adhesion-like molecule) family proteins regulate synapse formation.
Won Mah1, Jaewon Ko, Jungyong Nam
1National Creative Research Initiative Center for Synaptogenesis, Department of Biological Sciences, KAIST, Daejeon 305-701, Korea.
Summary
Synaptic adhesion-like molecules (SALMs), specifically SALM3 and SALM5, promote synapse formation. These proteins are crucial for both excitatory and inhibitory synapse development and function.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Synapse formation is regulated by cell adhesion molecules, but few with synaptogenic activity are known.
- Synaptic adhesion-like molecules (SALMs) are implicated in neurite outgrowth and synapse maturation, but their role in synapse formation is unclear.
Purpose of the Study:
- To investigate the role of SALM family proteins, specifically SALM3 and SALM5, in synapse formation.
- To determine the mechanisms by which SALM3 and SALM5 influence excitatory and inhibitory synapse development.
Main Methods:
- Expressing SALM3 and SALM5 in neural and non-neural cells to observe effects on presynaptic differentiation.
- Analyzing SALM3 and SALM5 enrichment in synaptic fractions and their interaction with postsynaptic density-95 (PSD-95).
- Investigating the impact of SALM5 knockdown on synapse number and function.
Main Results:
- SALM3 and SALM5 expression induced both excitatory and inhibitory presynaptic differentiation.
- SALM3 and SALM5 proteins are synaptic and interact with PSD-95, a key excitatory postsynaptic scaffolding protein.
- SALM5 knockdown reduced the number and function of excitatory and inhibitory synapses, suggesting a critical role in synapse formation.
Conclusions:
- Selected SALM proteins, including SALM3 and SALM5, play a regulatory role in synapse formation.
- SALM3 and SALM5 may promote synapse formation through distinct molecular mechanisms, highlighting their specific contributions to synaptic development.
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