Related Experiment Video
Updated: Feb 11, 2026
3D Culturing of Organoids from the Intestinal Villi Epithelium Undergoing Dedifferentiation
Published on: April 1, 2021
Smad4/DPC4
Aoife J McCarthy1, Runjan Chetty1
1Laboratory Medicine Program, Department of Anatomical Pathology, University Health Network and University of Toronto, Toronto, Ontario, Canada.
Abstract:
Smad4 or DPC4 belongs to a family of signal transduction proteins that are phosphorylated and activated by transmembrane serine-threonine receptor kinases in response to transforming growth factor beta (TGF-β) signaling via several pathways. The gene acts as a tumour suppressor gene and inactivation of smad4/DPC4 is best recognised in pancreatic cancer. However, smad4/DPC4 is also mutated in other conditions and cancers such as juvenile polyposis syndrome with and without hereditary haemorrhagic telangiectasia, colorectal and prostate cancers.Immunohistochemistry for smad4/DPC4 protein is most useful in separating benign/reactive conditions from pancreatic cancer in needle/core biopsies. In normal and reactive states, the protein is localised to the cytoplasm and nucleus, while the protein is lost in high-grade pancreatic intraepithelial neoplasia/carcinoma in situ and pancreatic cancer.
Insights
Smad4 (also known as DPC4) is a tumor suppressor gene. Loss of Smad4 protein expression is a key indicator distinguishing pancreatic cancer from benign conditions in biopsies.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Smad4 (DPC4) is a crucial signal transducer in TGF-β pathways.
- It functions as a tumor suppressor gene, with its inactivation implicated in various cancers.
Purpose of the Study:
- To highlight the diagnostic utility of Smad4 protein expression in pancreatic cancer detection.
- To review the role of Smad4 in different pathological conditions.
Main Methods:
- Immunohistochemistry was employed to assess Smad4 protein localization and expression.
- Analysis of Smad4 status in pancreatic cancer, juvenile polyposis syndrome, and other malignancies.
Main Results:
- Smad4 protein is normally found in the cytoplasm and nucleus.
- Loss of Smad4 expression is observed in high-grade pancreatic intraepithelial neoplasia and pancreatic cancer.
- Smad4 inactivation is associated with pancreatic, colorectal, and prostate cancers, as well as juvenile polyposis syndrome.
Conclusions:
- Immunohistochemistry for Smad4 is valuable for differentiating pancreatic cancer from benign conditions in biopsies.
- Smad4 status is an important biomarker in various gastrointestinal and other cancers.