AI Article Synopsis
- Researchers explored how amyloid precursor protein (APP), commonly linked to Alzheimer's, also influences breast cancer progression via its cleavage into a fragment called soluble APPα (sAPPα).
- They found that both full-length APP and sAPPα promote breast cancer cell migration and growth, with this process being driven by the enzyme ADAM10.
- The study suggests that high levels of APP and ADAM10 in non-luminal breast cancer patients are linked to poorer survival rates, indicating that targeting APP or ADAM10 could be an effective treatment strategy.
Article Abstract
Background: Amyloid precursor protein (APP), best known for its association with Alzheimer disease, has recently been implicated in breast cancer progression. However, the precise mechanism involved remains unclear. Here, we investigated the role of APP proteolytic cleavage in breast cancer functions.
Methods: The presence of APP proteolytic cleavage products was examined in breast cancer cell lines. The functional roles of APP in breast cancer were studied in vitro and tumor xenograft model using siRNA. The effects of full length APP and the α-secretase cleaved ectodomain fragment, soluble APPα (sAPPα) were further investigated for their overexpression in breast cancers. The α-secretase involved was identified. The α-secretase expression together with APP was examined in clinical breast cancers.
Results: We showed that APP underwent proteolytic cleavage in breast cancer cells to generate sAPPα. The sAPPα and full length protein mediated breast cancer migration and proliferation, but in different functional extent. This proteolytic cleavage was mediated by ADAM10. Downregulation of APP and ADAM10 brought about similar functional effects. Overexpression of sAPPα reversed the effects of ADAM10 downregulation. Interestingly, in patients with non-luminal breast cancers, APP and ADAM10 expression correlated with each other and their co-expression was associated with the worst outcome.
Conclusions: These results demonstrated the contributory role of APP cleavage on its oncogenic roles in breast cancer. ADAM10 was the key α-secretase. APP and ADAM10 co-expression was associated with worse survival in non-luminal breast cancers. Targeting of APP or its processing by ADAM10 might be a promising treatment option in these cancers.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6306343 | PMC |
| http://dx.doi.org/10.1016/j.ebiom.2018.11.012 | DOI Listing |
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