FoxO transcription factors; Regulation by AKT and 14-3-3 proteins

Area of Science:

• Molecular Biology
• Cellular Biology
• Biochemistry

Background:

• The forkhead box O (FoxO) transcription factor family is crucial in cellular processes regulated by insulin and insulin-like growth factor signaling.
• Mammalian FoxO proteins (FoxO1, 3, 4, 6) are involved in cell proliferation, apoptosis, metabolism, and aging.
• AKT is a primary regulator of FoxO function, with complex posttranslational modifications and protein interactions influencing its activity.

Purpose of the Study:

• To review the current understanding of FoxO regulation by AKT and 14-3-3 proteins.
• To focus on the mechanistic and structural aspects of this regulation.
• To discuss the interplay between AKT/14-3-3 mediated FoxO regulation and other regulatory pathways.

Main Methods:

• Literature review of genetic and biochemical studies.
• Analysis of mechanistic and structural data on FoxO regulation.
• Synthesis of information on the PI3K-AKT-FoxO signaling axis.

Main Results:

• AKT and 14-3-3 proteins are key regulators of FoxO transcription factors.
• Regulation involves intricate posttranslational modifications and protein-protein interactions.
• This regulatory axis is critical in cellular responses and has implications for cancer and aging.

Conclusions:

• AKT and 14-3-3 proteins play a central role in controlling FoxO activity through detailed molecular mechanisms.
• Understanding these interactions is vital for comprehending cellular homeostasis and disease pathogenesis.
• The PI3K-AKT-FoxO pathway is a significant target for therapeutic interventions in cancer and aging research.