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The protein kinase B/Akt signalling pathway in human malignancy
Karleen M Nicholson1, Neil G Anderson
1Division of Cancer Studies, School of Medicine, University of Manchester, G.38, Stopford Building, Oxford Road, M13 9PT, Manchester, UK.
Cellular Signalling
|March 8, 2002
Summary
Protein kinase B (PKB/Akt) signaling, activated by growth factors, is crucial in cell metabolism and survival. Constitutive PKB/Akt activation is linked to human cancers, promoting proliferation and survival.
Area of Science:
- Cellular Biology
- Molecular Biology
- Oncology
Background:
- Protein kinase B (PKB/Akt) is a serine/threonine kinase with three mammalian isoforms (Akt1, Akt2, Akt3).
- PKB/Akt activation occurs downstream of phosphoinositide 3-kinase (PI-3K) signaling.
- PI-3K generates PIP(3), a lipid second messenger essential for PKB/Akt membrane translocation and activation by PDK-1.
Purpose of the Study:
- To review recent developments in understanding PKB/Akt activation mechanisms.
- To explore the consequences of PKB/Akt activation in human malignancy.
- To highlight the role of constitutive PKB/Akt signaling in cancer progression.
Main Methods:
- Literature review of recent scientific publications.
- Analysis of signaling pathways involving PKB/Akt.
- Examination of genetic and mutational factors contributing to PKB/Akt activation in cancer.
Main Results:
- PKB/Akt regulates key cellular processes including metabolism, apoptosis, and proliferation.
- Constitutive activation of PKB/Akt is frequently observed in human cancers.
- Mechanisms of constitutive activation include gene amplification and pathway mutations.
Conclusions:
- Constitutive PKB/Akt signaling promotes cancer cell proliferation and survival.
- Understanding PKB/Akt activation is critical for cancer research and therapeutic strategies.
- Further research is needed to fully elucidate the mechanisms and consequences of PKB/Akt dysregulation in malignancy.