Inhibition of SYK kinase does not confer a pro-proliferative or pro-invasive phenotype in breast epithelium or breast cancer cells Journal Article
| Authors: | Lamb, D. J.; Rust, A.; Rudisch, A.; Glüxam, T.; Harrer, N.; Machat, H.; Christ, I.; Colbatzky, F.; Wernitznig, A.; Osswald, A.; Sommergruber, W. |
| Article Title: | Inhibition of SYK kinase does not confer a pro-proliferative or pro-invasive phenotype in breast epithelium or breast cancer cells |
| Abstract: | SYK has been reported to possess both tumour promotor and repressor activities and deletion has been linked to a pro-proliferative / pro-invasive phenotype in breast tumours. It is unclear whether this is a consequence of protein deletion or loss of kinase activity. The SYK inhibitor, BI 1002494, caused no increase in proliferation in breast cancer cells or primary mammary epithelial cells in 2D or 3D cultures, nor changes in proliferation (CD1/2, CDK4, PCNA, Ki67) or invadopodia markers (MMP14, PARP, phospho-vimentin Ser56). BI 1002494 did not alter SYK protein expression. There was no change in phenotype observed in 3D cultures after addition of BI 1002494. Thirteen weeks of treatment with BI 1002494 resulted in no ductal branching or cellular proliferation in the mammary glands of mice. An in silico genetic analysis in breast tumour samples revealed no evidence that SYK has a typical tumour suppressor gene profile such as focal deletion, inactivating mutations or lower expression levels. Furthermore, SYK mutations were not associated with reduction in survival and disease-free period in breast cancer patients. In conclusion, small molecule inhibition of the kinase function of SYK does not contribute to a typical tumour suppressor profile. Copyright: © Lamb et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License 3.0 (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
| Keywords: | immunohistochemistry; controlled study; protein expression; protein phosphorylation; unclassified drug; human cell; promoter region; somatic mutation; histopathology; nonhuman; flow cytometry; genetic analysis; cell proliferation; mouse; phenotype; animal tissue; cell viability; apoptosis; breast cancer; animal experiment; animal model; protein p53; histology; immunocytochemistry; cancer cell; breast carcinoma; western blotting; phosphatidylinositol 3,4,5 trisphosphate 3 phosphatase; breast epithelium; immunofluorescence test; proliferation; computer model; protein p21; autoradiography; encapsulation; cyclin dependent kinase 4; transcription factor cdx2; protein bax; matrix metalloproteinase 14; cd1 antigen; protein kinase syk; spheroid cell; human; female; article; 3d culture; cell proliferation assay; mda-mb-468 cell line; protein kinase syk inhibitor; murine mammary gland; syk inhibitor; bi1002494; cell culture technique; du4475 cell line; mcf10ca1a cell line |
| Journal Title: | Oncotarget |
| Volume: | 11 |
| Issue: | 14 |
| ISSN: | 1949-2553 |
| Publisher: | Impact Journals |
| Date Published: | 2020-04-07 |
| Start Page: | 1257 |
| End Page: | 1272 |
| Language: | English |
| DOI: | 10.18632/oncotarget.27545 |
| PROVIDER: | scopus |
| PMCID: | PMC7147091 |
| PUBMED: | 32292575 |
| DOI/URL: | |
| Notes: | Article -- Source: Scopus |
