Background: The Forkhead family of transcription factors is involved in tumorigenesis of rhabdomyosarcoma and acute leukemias . Within the family, three members (FoxO1, FoxO4 and FoxO3a) have sequence similarity to the nematode orthologue DAF-16, which mediates signaling via a pathway involving IGFR1, PI3K and Akt . Active forkhead members act as tumor suppressors by promoting cell cycle arrest and apoptosis. Increased expression of any FoxO member results in the activation of the cell cycle inhibitor p27Kip1. Forkhead transcription factors also play a part in TGF-β-mediated upregulation of p21CIP1, a process negatively regulated through PI3K. Increased proliferation results when forkhead transcription factors are inactivated through phosphorylation by Akt at Thr24, Ser256 and Ser319, which results in nuclear export and inhibition of transcription factor activity. Forkhead transcription factors can also be inhibited by the deacetylase sirtuin (SirT1). In Fox03a, the three sites phosphorylated by Akt mentioned above are Thr32, Ser253 and Ser315. Fox03a associates with 14-3-3 proteins upon phosphorylation by Akt and is retained in the cytoplasm. In the absence of survival factors, Fox03a is dephosphorylated, translocates to the nucleus and triggers cell death by a Fas ligand-dependent mechanism.
Description: Rabbit polyclonal to FOXO3A(phosphor Ser253)
Immunogen: A synthesized phosphopeptide derived from human FOXO3A around the phosphorylation site of serine 253
Specificity: ·Reacts with Human, Mouse and Rat.
·Isotype: IgG
Application: ·Western blotting: 1/100-500. Predicted Mol wt: 70 kDa;
·Immunohistochemistry (Frozen/paraffin tissue section): 1/50-200;
·Immunocytochemistry: 1/100;
·ELISA: 1/500;
· Optimal working dilutions must be determined by the end user.
