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Updated: Feb 11, 2026
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An Enhanced Green Fluorescence Protein-based Assay for Studying Neurite Outgrowth in Primary Neurons
Published on: October 19, 2019
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Amyloid Precursor Protein Dimerisation Reduces Neurite Outgrowth.
Luan Luu1, Giuseppe D Ciccotosto1,2,3, Laura J Vella3
1Department of Pathology, The University of Melbourne, Melbourne, VIC, 3010, Australia.
Molecular Neurobiology
|April 21, 2018
Summary
Stabilized amyloid precursor protein (APP) dimers impair neurite outgrowth by altering RhoA GTPase activity and decreasing miR-34a expression. Restoring miR-34a levels rescues this effect, revealing a novel link between APP dimerization and neuronal development.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Amyloid precursor protein (APP) metabolism and processing are influenced by its homodimerization.
- APP's role in neurite outgrowth is critical for neuronal development and function.
Purpose of the Study:
- To investigate the functional impact of stabilized APP dimers on neurite outgrowth.
- To elucidate the molecular mechanisms underlying APP dimer-mediated effects on neuronal morphology.
Main Methods:
- Engineered APP dimer formation using APPL17C construct in SH-SY5Y cells.
- Assessed neurite outgrowth, APP transport, RhoA GTPase activity, and miRNA expression (Small RNAseq).
- Utilized conditioned media rescue experiments and RhoA inhibitor treatment.
Main Results:
- APPL17C overexpression reduced neurite outgrowth compared to wild-type APP (APPWT).
- APPL17C exhibited altered transport, ER localization, and increased RhoA GTPase activity.
- miR-34a expression was significantly decreased in APPL17C cells, and its restoration rescued neurite outgrowth.
Conclusions:
- Stabilized APP dimerization negatively impacts neurite outgrowth.
- The observed phenotype is mediated by increased RhoA activity and reduced miR-34a expression.
- This study uncovers a novel regulatory pathway linking APP dimerization to neuritogenesis via miR-34a.
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