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The Src family kinase inhibitors PP2 and PP1 effectively block TGF-beta1-induced cell migration and invasion in both established and primary carcinoma cells

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Abstract

Purpose

We have previously demonstrated that in pancreatic ductal adenocarcinoma (PDAC)-derived cell lines, the common Src family kinase inhibitors PP2 and PP1 effectively inhibited morphologic alterations associated with TGFβ1-mediated epithelial-to-mesenchymal transition (EMT) by blocking the kinase activity of the TGF-β type I receptor ALK5 rather than Src (Ungefroren et al. in Curr Cancer Drug Targets 11:524, 2011). In this report, the ability of PP2 and PP1, the more specific Src inhibitor SU6656, and the ALK5 inhibitor SB431542 to functionally block TGF-β1-dependent EMT and cell motility in established PDAC (Panc-1, Colo 357) and primary NSCLC (Tu459) cell lines were investigated.

Methods

The effects of PP2, PP1, SU6656, and SB431542 on TGF-β1-dependent cell scattering/EMT, cell migration/invasion, and expression of invasion-associated genes were measured by using the real-time cell analysis assay on the xCELLigence system and quantitative real-time RT-PCR, respectively.

Results

In all three cell lines tested, PP1, PP2, and SB431542 effectively blocked TGF-β1-induced cell scattering/EMT, migration, and invasion and in Colo 357 cells inhibited the induction of the invasion-associated MMP2 and MMP9 genes. In contrast, SU6656 only blocked TGF-β1-induced invasion in Panc-1 and Tu459 but not Colo 357 cells. PP1, and to a greater extent PP2, also inhibited the high spontaneous migratory activity of Panc-1 cells expressing a kinase-active ALK5 mutant.

Conclusions

These data provide evidence that PP2 and PP1 are powerful inhibitors of TGF-β-induced cell migration and invasion in vitro and directly target ALK5. Both agents may be useful as dual TGF-β/Src inhibitors in experimental therapeutics to prevent metastatic spread in late-stage PDAC and NSCLC.

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Abbreviations

ALK5:

Activin receptor-like kinase 5

DMSO:

Dimethyl sulfoxide

EMT:

Epithelial-to-mesenchymal transition

FCS:

Fetal calf serum

NSCLC:

Non-small cell lung carcinoma

PDAC:

Pancreatic ductal adenocarcinoma

PP1:

4-Amino-5-(4-methylphenyl)-7-(t-butyl) pyrazolo[3,4-d] pyrimidine

PP2:

4-Amino-5-(4-chlorophenyl)-7-(t-butyl) pyrazolo[3,4-d] pyrimidine

PP3:

4-Amino-7-phenyl pyrazolo[3,4-d] pyrimidine

siRNA:

Small interfering RNA

SFK:

Src family kinase

TBP:

TATA box-binding protein

TGF-β:

Transforming growth factor-β

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Acknowledgments

We thank H. Albrecht and S. Grammerstorf for their excellent technical assistance and Dr. J. Massagué (Memorial Sloan-Kettering Cancer Center, NY) for generously providing the ALK5T204D plasmid.

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Correspondence to Hendrik Ungefroren.

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Bartscht, T., Lehnert, H., Gieseler, F. et al. The Src family kinase inhibitors PP2 and PP1 effectively block TGF-beta1-induced cell migration and invasion in both established and primary carcinoma cells. Cancer Chemother Pharmacol 70, 221–230 (2012). https://doi.org/10.1007/s00280-012-1904-0

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  • DOI: https://doi.org/10.1007/s00280-012-1904-0

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