Annexin A2 Regulates AKT Upon H2O2-Dependent Signaling Activation in Cancer Cells
AbstractHydrogen peroxide (H2O2) is a main second messenger in oncogenic signaling networks including the Ras and the growth factor receptor pathways. This is achieved predominantly through the oxidation of redox-sensitive cysteine (Cys) residues in proteins resulting in changes to their structure and function. We previously identified annexin A2 (ANXA2) as a redox regulatory protein that plays an important cellular role during oxidative stress and also promoting tumorigenesis. Here we investigated the role of ANXA2 in the regulation of H2O2-dependent signaling that drives tumor progression. We show that depletion of ANXA2 leads to the enhanced activation of AKT following either EGF/EGFR stimulation or oncogenic Ras transformation. The phosphatase and tensin homologue (PTEN) protein negatively regulates the PI3K/AKT pathway. We demonstrate that ANXA2 via its reactive Cys-8 residue, binds to PTEN and that the co-expression of PTEN and ANXA2, but not ANXA2 Cys-8-Ala mutant, inhibits AKT phosphorylation on Ser 473. These results indicate that ANXA2 is important for PTEN regulation within the PI3K/AKT signaling cascade. Furthermore, we also reveal that ANXA2 inversely regulates the expression of the peroxidase, peroxiredoxin 2, in a reactive oxygen species dependent manner. View Full-Text
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Castaldo, S.A.; Ajime, T.; Serrão, G.; Anastácio, F.; Rosa, J.T.; Giacomantonio, C.A.; Howarth, A.; Hill, R.; Madureira, P.A. Annexin A2 Regulates AKT Upon H2O2-Dependent Signaling Activation in Cancer Cells. Cancers 2019, 11, 492.
Castaldo SA, Ajime T, Serrão G, Anastácio F, Rosa JT, Giacomantonio CA, Howarth A, Hill R, Madureira PA. Annexin A2 Regulates AKT Upon H2O2-Dependent Signaling Activation in Cancer Cells. Cancers. 2019; 11(4):492.Chicago/Turabian Style
Castaldo, Stéphanie A.; Ajime, Tom; Serrão, Gisela; Anastácio, Fábio; Rosa, Joana T.; Giacomantonio, Carman A.; Howarth, Alison; Hill, Richard; Madureira, Patrícia A. 2019. "Annexin A2 Regulates AKT Upon H2O2-Dependent Signaling Activation in Cancer Cells." Cancers 11, no. 4: 492.
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