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Deleted in liver cancer protein family in human malignancies (Review)
D Lukasik1, E Wilczek, A Wasiutynski
1Department of Pathology, Medical University of Warsaw, Warsaw 02-106, Poland.
Abstract:
The Deleted in Liver Cancer (DLC) protein family comprises proteins that exert their function mainly by the Rho GTPase-activating protein (GAP) domain and by regulation of the small GTPases. Since Rho GTPases are key factors in cell proliferation, polarity, cytoskeletal remodeling and migration, the aberrant function of their regulators may lead to cell transformation. One subgroup of these proteins is the DLC family. It was found that the first identified gene from this family, DLC1, is often lost in hepatocellular carcinoma and may be involved as a tumor suppressor in the liver. Subsequent studies evaluated the hypothesis that the DLC1 gene acts as a tumor suppressor, not only in liver cancer, but also in other types of cancer. Following DLC1, two other members of the DLC protein family, DLC2 and DLC3, were identified. However, limited published data are available concerning the role of these proteins in malignant transformation. This review focuses on the structure and the role of DLC1 and its relatives in physiological conditions and summarizes data published thus far regarding DLC function in the neoplastic process.
Insights
The Deleted in Liver Cancer (DLC) protein family, including DLC1, DLC2, and DLC3, regulates cell functions. Aberrant DLC protein function may drive cancer development, with DLC1 showing tumor suppressor activity.
Area of Science:
- Molecular Biology
- Oncology
- Cell Biology
Background:
- The Deleted in Liver Cancer (DLC) protein family regulates small GTPases via Rho GTPase-activating protein (GAP) domains.
- Small GTPases are crucial for cell proliferation, polarity, cytoskeletal remodeling, and migration.
- Dysregulation of these regulators can lead to cell transformation and cancer.
Purpose of the Study:
- To review the structure and physiological roles of DLC1 and related proteins.
- To summarize current knowledge on the function of DLC proteins in the neoplastic process.
- To highlight the potential tumor suppressor roles of the DLC protein family.
Main Methods:
- Literature review of published studies on DLC protein family members.
- Analysis of the structural and functional domains of DLC proteins.
- Compilation of data on DLC protein involvement in various cancers.
Main Results:
- DLC1 is frequently lost in hepatocellular carcinoma and acts as a tumor suppressor.
- DLC1's tumor suppressor role has been investigated in multiple cancer types beyond liver cancer.
- Limited data exist on the roles of DLC2 and DLC3 in malignant transformation.
Conclusions:
- DLC proteins, particularly DLC1, are implicated in cancer development.
- Further research is needed to fully elucidate the roles of DLC2 and DLC3 in tumorigenesis.
- Understanding DLC protein function is critical for cancer research and therapeutic strategies.
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