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Transforming growth factor-alpha and human cancer
1Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital, Boston, MA 02115.
Abstract:
Human transforming growth factor-alpha TGF-alpha, a polypeptide growth factor which causes reversible transformation of normal cells, is composed of 50 amino acid residues, has a 30 to 40% amino acid homology to epidermal growth factor (EGF), and binds the EGF receptor. In human cancers, studies are beginning to show that TGF-alpha could serve as a tumor marker and as a marker for the malignant potential of a tumor. Thus far, the types of carcinomas with which abnormal TGF-alpha expression has been associated include liver, gastrointestinal, breast, skin, lung, brain and ovarian cancers. TGF-alpha may play a role in the processes involved with tumor initiation and tumor growth. In cell lines, TGF-alpha has been found to be associated with autocrine and paracrine types of cellular growth initiation and with increased levels of oncogene expression. In summary, the evidence concerning human TGF-alpha are that TGF-alpha could serve as a marker for human cancers and that an understanding of the basic actions of TGF-alpha could help to explain the self-sustaining nature of tumors.
Insights
Transforming growth factor-alpha (TGF-alpha) shows potential as a tumor marker for various human cancers. Understanding TGF-alpha
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Human transforming growth factor-alpha (TGF-alpha) is a polypeptide growth factor.
- It shares homology with epidermal growth factor (EGF) and binds the EGF receptor.
- Abnormal TGF-alpha expression is linked to several human carcinomas.
Purpose of the Study:
- To investigate the role of TGF-alpha as a tumor marker.
- To explore its potential in indicating malignant tumor potential.
- To understand its involvement in tumor initiation and growth.
Main Methods:
- Analysis of TGF-alpha expression in various human cancers.
- Cell line studies examining TGF-alpha's effect on cellular growth.
- Investigation of oncogene expression in relation to TGF-alpha.
Main Results:
- TGF-alpha is associated with abnormal expression in liver, gastrointestinal, breast, skin, lung, brain, and ovarian cancers.
- TGF-alpha promotes autocrine and paracrine cellular growth initiation in cell lines.
- Increased oncogene expression is linked to TGF-alpha presence.
Conclusions:
- TGF-alpha can serve as a significant marker for human cancers.
- Understanding TGF-alpha's functions may elucidate tumor self-sustainability.
- Further research into TGF-alpha's mechanisms is warranted for therapeutic strategies.