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Published on: January 12, 2020
Immunolocalization of notch signaling protein molecules in a maxillary chondrosarcoma and its recurrent tumor
1Department of Oral Pathology, Oral Medicine & Periodontology, Faculty of Dentistry, Univrersity of Malaya, Kuala Lumpur, Malaysia.
Background:
notch receptors are critical determinants of cell fate in a variety of organisms. Notch signaling is involved in the chondrogenic specification of neural crest cells. Aberrant Notch activity has been implicated in numerous human diseases including cancers; however its role in chondrogenic tumors has not been clarified.
Method:
tissue samples from a case of primary chondrosarcoma of the maxilla and its recurrent tumor were examined immunohistochemically for Notch1-4 and their ligands (Jagged1, Jagged2 and Delta1) expression.
Results:
both primary and recurrent tumors were histopathologically diagnosed as conventional hyaline chondrosarcoma (WHO Grade I). Hypercellular tumor areas strongly expressed Notch3 and Jagged1 in spindle and pleomorphic cells suggesting up-regulation of these protein molecules at sites of tumor proliferation. Expression patterns were distinct with some overlap. Differentiated malignant and atypical chondrocytes demonstrated variable expression levels of Jagged1, and weak to absent staining for Notch1, 4 and Delta1. Protein immunolocalization was largely membranous and cytoplasmic, sometimes outlining the lacunae of malignant chondrocytes. Hyaline cartilage demonstrated a diffuse or granular precipitation of Jagged1 suggesting presence of soluble Jagged1 activity at sites of abnormal chondrogenesis. No immunoreactivity for the other Notch members was observed. Calcified cartilage was consistently Notch-negative indicating down-regulation of Notch with cartilage maturation. Stromal components namely endothelial cells and fibroblasts variably expressed Notch1, 3 and Jagged1 but were mildly or non-reactive for the other members.
Conclusions:
Results indicate that Notch signaling pathway may participate in cellular differentiation and proliferation in chondrosarcoma. Findings implicate Notch3 and Jagged1 as key molecules that influence the differentiation and maturation of cells of chondrogenic lineage.
Insights
Notch3 and Jagged1 are key molecules in chondrosarcoma, influencing cell differentiation and proliferation. Their expression suggests Notch signaling plays a role in chondrogenic tumors.
Area of Science:
- Oncology
- Cell Biology
- Molecular Signaling
Background:
- Notch receptors are crucial for cell fate determination across organisms.
- Notch signaling is implicated in neural crest cell chondrogenesis and human diseases like cancer.
- The specific role of Notch signaling in chondrogenic tumors remains unclear.
Purpose of the Study:
- To investigate the expression and potential role of Notch signaling pathway components in chondrosarcoma.
- To identify key Notch molecules involved in the differentiation and proliferation of chondrosarcoma cells.
Main Methods:
- Immunohistochemical analysis of Notch1-4 and their ligands (Jagged1, Jagged2, Delta1) in primary and recurrent chondrosarcoma tissues.
- Evaluation of protein expression patterns in tumor cells, stromal components, and surrounding cartilage.
Main Results:
- Both primary and recurrent chondrosarcomas (WHO Grade I) showed strong expression of Notch3 and Jagged1 in hypercellular areas.
- Malignant chondrocytes exhibited variable Jagged1 expression and weak/absent Notch1, Notch4, and Delta1 staining.
- Soluble Jagged1 activity was suggested in abnormal chondrogenesis, while calcified cartilage showed downregulated Notch signaling.
Conclusions:
- The Notch signaling pathway appears to be involved in chondrosarcoma cell differentiation and proliferation.
- Notch3 and Jagged1 are identified as critical molecules influencing chondrogenic lineage cell differentiation and maturation in chondrosarcoma.
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