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Overexpression of SAMD9 suppresses tumorigenesis and progression during non small cell lung cancer
Qing Ma1, Tao Yu1, Yao-Yao Ren1
1Department of Oncology, General Hospital of Tianjin Medical University, Tianjin, China.
Abstract:
The Sterile Alpha Motif Domain-containing 9 (SAMD9) gene has been recently emphasized during the discovery that it is expressed at a lower level in aggressive fibromatosis and some cases of breast and colon cancer, however, the underlying mechanisms are poorly understood. Here, we found that SAMD9 is down-regulated in human non-small cell lung cancer (NSCLC). Furthermore, knockdown of SAMD9 expression is increased the invasion, migration and proliferation in H1299 cells in vitro and overexpression of SAMD9 suppressed proliferation and invasion in A549 cells. Finally, depletion of SAMD9 increases tumor formation in vivo. Our results may provide a strategy for blocking NSCLC tumorigenesis and progression.
Insights
Sterile Alpha Motif Domain-containing 9 (SAMD9) gene down-regulation promotes non-small cell lung cancer (NSCLC) progression. Reduced SAMD9 levels enhance tumor cell invasion, migration, and growth, suggesting SAMD9 as a potential therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- The Sterile Alpha Motif Domain-containing 9 (SAMD9) gene's role in cancer is emerging.
- SAMD9 is downregulated in aggressive fibromatosis, breast, and colon cancers.
- Mechanisms underlying SAMD9's function in tumorigenesis remain unclear.
Purpose of the Study:
- To investigate the role of SAMD9 in non-small cell lung cancer (NSCLC).
- To determine the impact of SAMD9 expression levels on NSCLC cell behavior and tumor formation.
Main Methods:
- Analysis of SAMD9 expression in human NSCLC tissues.
- In vitro studies using cell lines (H1299, A549) with SAMD9 knockdown and overexpression.
- In vivo tumor formation assays in a xenograft model.
Main Results:
- SAMD9 is significantly downregulated in human NSCLC.
- SAMD9 knockdown increased invasion, migration, and proliferation of NSCLC cells in vitro.
- SAMD9 overexpression suppressed NSCLC cell proliferation and invasion.
- SAMD9 depletion enhanced tumor formation in vivo.
Conclusions:
- SAMD9 acts as a tumor suppressor in NSCLC.
- Downregulation of SAMD9 contributes to NSCLC progression.
- Targeting SAMD9 may offer a novel strategy for NSCLC treatment.
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