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BACKGROUND: PIM serine/threonine kinases are often highly expressed in haematological malignancies. We have shown that PIM inhibitors reduced the survival and migration of leukaemic cells. Here, we investigated PIM kinases in diffuse large B-cell lymphoma (DLBCL) biopsy samples and DLBCL cell lines. METHODS: Immunohistochemical staining for PIM kinases and CXCR4 was performed on tissue microarrays from a cohort of 101 DLBCL cases, and the effects of PIM inhibitors on the survival and migration of DLBCL cell lines were determined. RESULTS: PIM1 expression significantly correlated with the activation of signal transducer and activator of transcription (STAT) 3 and 5, P-glycoprotein expression, CXCR4-S339 phosphorylation, and cell proliferation. Whereas most cases exhibited cytoplasmic or cytoplasmic and nuclear PIM1 and PIM2 expression, 12 cases (10 of the non-germinal centre DLBCL type) expressed PIM1 predominately in the nucleus. Interestingly, nuclear expression of PIM1 significantly correlated with disease stage. Exposure of DLBCL cell lines to PIM inhibitors modestly impaired cellular proliferation and CXCR4-mediated migration. CONCLUSION: This work demonstrates that PIM expression in DLBCL is associated with activation of the JAK/STAT signalling pathway and with the proliferative activity. The correlation of nuclear PIM1 expression with disease stage and the modest response to small-molecule inhibitors suggests that PIM kinases are progression markers rather than primary therapeutic targets in DLBCL.

Original publication

DOI

10.1038/bjc.2012.272

Type

Journal article

Journal

Br J Cancer

Publication Date

24/07/2012

Volume

107

Pages

491 - 500

Keywords

ATP-Binding Cassette, Sub-Family B, Member 1, Biomarkers, Tumor, Cell Line, Tumor, Cell Movement, Cell Nucleus, Cell Proliferation, Cohort Studies, Cytoplasm, Disease Progression, Female, Humans, Janus Kinases, Lymphoma, Large B-Cell, Diffuse, Male, Molecular Targeted Therapy, Phosphorylation, Protein-Serine-Threonine Kinases, Proto-Oncogene Proteins c-pim-1, Receptors, CXCR4, STAT3 Transcription Factor, STAT5 Transcription Factor, Signal Transduction, Survival Rate