How APP and its secreted form affect nerve growth
Author Information
Author(s): Young-Pearse Tracy L, Chen Allen C, Chang Rui, Marquez Cesar, Selkoe Dennis J
Primary Institution: Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School
Hypothesis
APPs-α may act to oppose effects of cell-surface APP and its homologues by competitively binding to factors that normally interact with the holoprotein to inhibit neurite outgrowth.
Conclusion
APPs-α regulates the function of APP in neurite outgrowth via the novel mechanism of competing with the binding of APP to Itgβ1.
Supporting Evidence
- Neurons lacking APP showed longer neurite lengths, indicating APP's role in regulating neurite outgrowth.
- APPs-α application promoted neurite outgrowth in wild-type neurons but had no effect in APP knock-out neurons.
- Blocking Integrin β1 inhibited the neurite outgrowth effects of both APP deletion and APPs-α application.
Takeaway
This study shows that a protein called APP helps nerve cells grow, and its secreted form, APPs-α, can actually stop it from working too much.
Methodology
The study involved culturing primary neurons from APP knock-out and wild-type mice and measuring neurite lengths after treatment with APPs-α.
Limitations
The study primarily focuses on in vitro results, which may not fully represent in vivo conditions.
Participant Demographics
Neurons from embryonic day 18 (E18) mice were used.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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