FOXO-1 contributes to cellular homeostasis by regulating genes involved in apoptosis, cell cycle arrest, and metabolism.
– In many cancers, FOXO-1 activity can be reduced via genetic or epigenetic mechanisms, altered subcellular localization (e.g., cytoplasmic sequestration following phosphorylation by Akt), or protein degradation.
– This loss of nuclear FOXO-1 activity is often associated with diminished tumor suppressor functions.
– Decreased nuclear FOXO-1 expression or activity correlates with higher tumor grade and poorer prognosis.
– FOXO-1 is a key downstream target of the PI3K/Akt pathway. Hyperactivation of Akt, common in many cancers, leads to FOXO-1 inactivation.
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