What question did this study set out to answer?

To determine whether binding of activated alpha2-macroglobulin to surface GRP78 stimulates PAK-1 or PAK-2 and regulates downstream LIMK signaling in metastatic prostate cancer cells.

May 21, 2005Journal of Biological ChemistryOpen Access

Binding of Activated α2-Macroglobulin to Its Cell Surface Receptor GRP78 in 1-LN Prostate Cancer Cells Regulates PAK-2-dependent Activation of LIMK

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Authors

UMUma Kant MisraDuke Medical Center RDRohit DeedwaniaDuke Medical Center SPSalvatore V. PizzoDuke University

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Implication

In vitro study demonstrates activated alpha2-macroglobulin triggers PAK-2 and LIMK signaling via surface GRP78 in prostate cancer cells, indicating a mechanism promoting metastatic motility.

Key Points

To determine whether binding of activated alpha2-macroglobulin to surface GRP78 stimulates PAK-1 or PAK-2 and regulates downstream LIMK signaling in metastatic prostate cancer cells.
Treated 1-LN human prostate cancer cells with receptor-recognized alpha2-macroglobulin and evaluated PAK-1/2 phosphorylation and catalytic activity toward myelin basic protein.
Employed targeted gene silencing of GRP78 and PAK-2 alongside specific inhibitors of tyrosine kinases and phosphatidylinositol 3-kinase to delineate the signaling cascade.
Assessed membrane translocation and downstream pathway activation using co-immunoprecipitation and Western blotting for phosphorylated LIMK and cofilin.
Alpha2-macroglobulin exposure elicited a 2- to 3-fold increase in phosphorylated PAK-2 and its kinase activity toward myelin basic protein, while PAK-1 phosphorylation remained negligibly affected.
GRP78 gene silencing, tyrosine kinase inhibition, or PI3K inhibition markedly attenuated PAK-2 phosphorylation and blocked its membrane co-translocation with NCK to GRP78 complexes.
PAK-2 activation substantially increased levels of phosphorylated LIMK and phosphorylated cofilin, whereas PAK-2 gene silencing strongly suppressed LIMK phosphorylation.

Cite This Study

Misra et al. (2005) studied this question.

synapsesocial.com/papers/6a8451614d02f4f0268d7b71 https://doi.org/10.1074/jbc.m414467200

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Implication

In vitro study demonstrates activated alpha2-macroglobulin triggers PAK-2 and LIMK signaling via surface GRP78 in prostate cancer cells, indicating a mechanism promoting metastatic motility.

Binding of Activated α2-Macroglobulin to Its Cell Surface Receptor GRP78 in 1-LN Prostate Cancer Cells Regulates PAK-2-dependent Activation of LIMK

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Implication

Key Points

Cite This Study

Binding of Activated α2-Macroglobulin to Its Cell Surface Receptor GRP78 in 1-LN Prostate Cancer Cells Regulates PAK-2-dependent Activation of LIMK

Discussion

Member takes

Implication

Key Points

Cite This Study

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