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Myosin-IIA heavy chain phosphorylation on S1943 regulates tumor metastasis.

ABSTRACT: Nonmuscle myosin-IIA (NMHC-IIA) heavy chain phosphorylation has gained recognition as an important feature of myosin-II regulation. In previous work, we showed that phosphorylation on S1943 promotes myosin-IIA filament disassembly in vitro and enhances EGF-stimulated lamellipod extension of breast tumor cells. However, the contribution of NMHC-IIA S1943 phosphorylation to the modulation of invasive cellular behavior and metastasis has not been examined. Stable expression of phosphomimetic (S1943E) or non-phosphorylatable (S1943A) NMHC-IIA in breast cancer cells revealed that S1943 phosphorylation enhances invadopodia function, and is critical for matrix degradation in vitro and experimental metastasis in vivo. These studies demonstrate a novel link between NMHC-IIA S1943 phosphorylation, the regulation of extracellular matrix degradation and tumor cell invasion and metastasis.

SUBMITTER: Norwood Toro LE

PROVIDER: S-EPMC6117828 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Myosin-IIA heavy chain phosphorylation on S1943 regulates tumor metastasis.

Norwood Toro Laura E LE Wang Yarong Y Condeelis John S JS Jones Joan G JG Backer Jonathan M JM Bresnick Anne R AR

Experimental cell research 20180625 2

Nonmuscle myosin-IIA (NMHC-IIA) heavy chain phosphorylation has gained recognition as an important feature of myosin-II regulation. In previous work, we showed that phosphorylation on S1943 promotes myosin-IIA filament disassembly in vitro and enhances EGF-stimulated lamellipod extension of breast tumor cells. However, the contribution of NMHC-IIA S1943 phosphorylation to the modulation of invasive cellular behavior and metastasis has not been examined. Stable expression of phosphomimetic (S1943 ...[more]

PMID: 29953877

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