FOXO (Forkhead box O) refers to a family of transcription factors that play a crucial role in various cellular processes, including cell cycle regulation, apoptosis (programmed cell death), and stress resistance. The FOXO proteins, particularly FOXO1, FOXO3, FOXO4, and FOXO6, are involved in the regulation of genes that control these processes.
FOXO proteins can act as tumor suppressors. They promote apoptosis and inhibit cell proliferation, which can help prevent the development and progression of tumors. When FOXO is activated, it can lead to the expression of genes that induce cell cycle arrest and apoptosis, thereby inhibiting cancer cell growth.
FOXO proteins are regulated by phosphorylation through pathways such as the PI3K/Akt pathway. When Akt is activated, it phosphorylates FOXO, leading to its exclusion from the nucleus and subsequent degradation.
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