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Multidimensional Coculture System to Model Lung Squamous Carcinoma Progression
Published on: March 17, 2020
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CADM1 inhibits squamous cell carcinoma progression by reducing STAT3 activity
Sabari Vallath1, Elizabeth K Sage1, Krishna K Kolluri1
1Lungs for Living Research Centre, University College London, UK.
Scientific Reports
|April 2, 2016
Summary
The tumor suppressor Cell adhesion molecule 1 (CADM1) inhibits squamous cell carcinoma (SqCC) progression by disrupting STAT3 signaling. Restoring CADM1 or inhibiting JAK/STAT pathways with ruxolitinib halts SqCC growth and metastasis.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- Squamous cell carcinomas (SqCCs) are a significant cause of cancer mortality, yet the molecular mechanisms driving their progression are not fully understood.
- Cell adhesion molecule 1 (CADM1) is a known tumor suppressor, but its specific role in SqCC pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate the function of the tumor suppressor CADM1 in regulating SqCC proliferation and invasion.
- To identify the molecular pathways through which CADM1 exerts its anti-cancer effects in SqCC.
- To explore the therapeutic potential of targeting the CADM1 pathway in SqCC treatment.
Main Methods:
- Gene transduction techniques were employed to manipulate CADM1 expression in SqCC models.
- Human tumor xenograft assays were utilized to assess the in vivo effects of CADM1 on tumor growth and metastasis.
- Biochemical assays were performed to analyze protein complex formation and downstream signaling pathways, including STAT3 activity.
Main Results:
- CADM1 was found to inhibit SqCC proliferation and invasion, critical processes in cancer progression.
- The extracellular domain of CADM1 mediates its tumor-suppressive function by forming a complex with HER2 and integrin α6β4.
- This complex formation disrupts downstream STAT3 signaling, thereby inhibiting SqCC growth and metastasis.
- Treatment of CADM1-deficient tumors with the JAK/STAT inhibitor ruxolitinib effectively mimicked the effects of CADM1 restoration, suppressing tumor growth and metastasis.
Conclusions:
- CADM1 acts as a crucial tumor suppressor in SqCC by inhibiting proliferation and invasion through a novel mechanism involving HER2 and integrin α6β4 complex formation.
- Disruption of STAT3 signaling by CADM1 is a key pathway by which it controls SqCC progression.
- Loss of CADM1 expression in tumors can identify patients who may benefit from JAK/STAT targeted therapies, such as ruxolitinib.
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