Aquaporin-3 Controls Breast Cancer Cell Migration by Regulating Hydrogen Peroxide Transport and Its Downstream Cell Signaling

Molecular and Cellular Biology
Hiroki Satooka, Mariko Hara-Chikuma

Abstract

Most breast cancer mortality is due to clinical relapse associated with metastasis. CXCL12/CXCR4-dependent cell migration is a critical process in breast cancer progression; however, its underlying mechanism remains to be elucidated. Here, we show that the water/glycerol channel protein aquaporin-3 (AQP3) is required for CXCL12/CXCR4-dependent breast cancer cell migration through a mechanism involving its hydrogen peroxide (H2O2) transport function. Extracellular H2O2, produced by CXCL12-activated membrane NADPH oxidase 2 (Nox2), was transported into breast cancer cells via AQP3. Transient H2O2 accumulation was observed around the membrane during CXCL12-induced migration, which may be facilitated by the association of AQP3 with Nox2. Intracellular H2O2 then oxidized PTEN and protein tyrosine phosphatase 1B (PTP1B) followed by activation of the Akt pathway. This contributed to directional cell migration. The expression level of AQP3 in breast cancer cells was related to their migration ability both in vitro and in vivo through CXCL12/CXCR4- or H2O2-dependent pathways. Coincidentally, spontaneous metastasis of orthotopic xenografts to the lung was reduced upon AQP3 knockdown. These findings underscore the importance of AQP3-trans...Continue Reading

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