Related Experiment Video
Updated: Apr 28, 2026
Integration of Bioinformatics Approaches and Experimental Validations to Understand the Role of Notch Signaling in Ovarian Cancer
Published on: January 12, 2020
Notch1 signaling controls cell proliferation, apoptosis and differentiation in lung carcinoma
Hassan Wael1, Ryoji Yoshida2, Shinji Kudoh3
1Department of Pathology and Experimental Medicine, Kumamoto University, Graduate School of Medical Sciences, Japan; Department of Pathology, Faculty of Medicine, Suez Canal University, Egypt.
Objectives:
The role of Notch signaling in human lung cancer still remains unclear, and there has been and stills a debate, on the extent to which Notch ligands and receptors are involved in lung cancer development. This study was carried out to investigate the role of Notch1 signaling in the proliferation and differentiation of human lung cancer cells.
Methods:
We used small interfering RNA (siRNA) technology to down-regulate the expression of Notch1 in small cell lung carcinoma (SCLC) cells; H69AR and SBC-3, as well as in non-small cell lung carcinoma (NSCLC) cells; A549 adenocarcinoma (ADC) and H2170 squamous cell carcinoma (SCC). Also, we transfected venus Notch1 intracellular domain (v.NICD) plasmid into the human SCLC line H69 and H1688. In addition, H1688 cells with activated Notch1 were injected into immune-compromised Rag2(-/-) Jak3(-/-) mice for analysis of ex vivo tumor growth and differentiation phenotype.
Results:
Notch1 controls cell proliferation and apoptosis in both SCLC and A549; but not in H2170 cell line. Overexpression of Notch1 in SCLC markedly decreased cell proliferation via apoptosis. The subcutaneous tumors arising from xenotransplaned SCLC cells transfected with Notch1 showed "epithelial-like glandular" arrangement, with positive Alcian blue staining and reduction in neuroendocrine markers.
Conclusion:
Notch1 up regulation has an inhibitory effect on cell growth and NE differentiation in SCLC, with induction of an epithelial-like morphology of cells in tissue samples. In NSCLC, Notch1 expression has a tumor inhibitory effect on ADC cells, but not SCC cells.
Insights
Notch1 signaling inhibits human lung cancer cell growth and neuroendocrine differentiation in small cell lung cancer (SCLC). It also suppresses tumor growth in adenocarcinoma but not squamous cell carcinoma of the lung.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- The precise role of Notch signaling in human lung cancer remains debated.
- Understanding Notch1's involvement is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the role of Notch1 signaling in the proliferation and differentiation of human lung cancer cells.
- To elucidate Notch1's impact on both small cell lung cancer (SCLC) and non-small cell lung cancer (NSCLC).
Main Methods:
- Down-regulation of Notch1 using small interfering RNA (siRNA) in SCLC and NSCLC cell lines.
- Overexpression of Notch1 intracellular domain (NICD) in SCLC cell lines.
- In vivo analysis of tumor growth and differentiation in immunocompromised mice xenotransplanted with Notch1-activated SCLC cells.
Main Results:
- Notch1 regulates proliferation and apoptosis in SCLC and A549 (NSCLC adenocarcinoma) cells, but not H2170 (NSCLC squamous cell carcinoma) cells.
- Overexpression of Notch1 in SCLC cells significantly reduced proliferation through apoptosis induction.
- Tumors derived from Notch1-overexpressing SCLC cells exhibited epithelial-like glandular structures and reduced neuroendocrine markers.
Conclusions:
- Notch1 upregulation inhibits cell growth and neuroendocrine differentiation in SCLC, promoting an epithelial-like morphology.
- Notch1 exerts an inhibitory effect on tumor growth in NSCLC adenocarcinoma cells, but not squamous cell carcinoma cells.
Related Concept Videos
03:14Notch Signaling Pathway
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not...
03:14Notch Signaling Pathway
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
01:24Regulation of Angiogenesis and Blood Supply
01:19Interactions Between Signaling Pathways
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
02:54Canonical Wnt Signaling Pathway