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Aurora kinase A is upregulated in cutaneous T-cell lymphoma and represents a potential therapeutic target

ABSTRACT: Cutaneous T-cell lymphomas form a heterogeneous group of non-Hodgkin lymphomas characterized by only poor prognosis in advanced stage. Despite significant progress made in the identification of novel genes and pathways involved in the pathogenesis of cutaneous lymphoma, the therapeutic value of these findings has still to be proven. Here, we demonstrate by gene expression arrays that aurora kinase A is one of highly overexpressed genes of the serine/threonine kinase in CTCL. The finding was confirmed by qualitative RT-PCR, Western blotting and immunohistochemistry in CTCL cell lines and primary patient samples. Moreover, treatment with a specific aurora kinase A inhibitor blocks cell proliferation by inducing cell cycle arrest in G2 phase as well as apoptosis in CTCL cell lines. These new data provide a promising rationale for using aurora kinase A inhibition as a therapeutic modality of CTCL.

ORGANISM(S): Homo sapiens

PROVIDER: GSE59307 | GEO | 2015/03/31

SECONDARY ACCESSION(S): PRJNA254998

REPOSITORIES: GEO

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Aurora kinase A is upregulated in cutaneous T-cell lymphoma and represents a potential therapeutic target

Project description:Cutaneous T-cell lymphomas form a heterogeneous group of non-Hodgkin lymphomas characterized by only poor prognosis in advanced stage. Despite significant progress made in the identification of novel genes and pathways involved in the pathogenesis of cutaneous lymphoma, the therapeutic value of these findings has still to be proven. Here, we demonstrate by gene expression arrays that aurora kinase A is one of highly overexpressed genes of the serine/threonine kinase in CTCL. The finding was confirmed by qualitative RT-PCR, Western blotting and immunohistochemistry in CTCL cell lines and primary patient samples. Moreover, treatment with a specific aurora kinase A inhibitor blocks cell proliferation by inducing cell cycle arrest in G2 phase as well as apoptosis in CTCL cell lines. These new data provide a promising rationale for using aurora kinase A inhibition as a therapeutic modality of CTCL. 14 lesional skin biopsies of different MF patients (patch=3, plaque=6, tumor=4) and 9 healthy controls. Comparison between Cutaneus Tcell Lymphoma Samples and Healthy Control Tissue

2015-03-31 | E-GEOD-59307 | biostudies-arrayexpress

Using global proteomics to investigate the effect of IQDMA treatment on Leukemic forms of cutaneous T-cell lymphomas (L-CTCL) cells

Project description:Leukemic cutaneous T-cell lymphomas (L-CTCL) are lymphoproliferative disorders of skin-homing mature T-cells causing chronic inflammation, tissue destruction, severe infections and sepsis, all linked to poor quality of life and high mortality. Despite numerous sequencing efforts in L-CTCL, recurrent driver mutations have not been identified, but chromosomal losses and gains are frequent and dominant. We integrated genomic landscape analysis with innovative pharmacologic interference studies to identify key vulnerable nodes in L-CTCL. In order to examine IQDMA-specific effects in an unbiased and dose-dependent manner without limiting the analysis to only kinases, we carried out global proteomics profiling in SeAx cells after 24 h treatment with 1, 2.5 and 10 µM IQDMA. The differential proteins affected in response to increasing IQDMA concentrations were found to be related to multiple cellular processes in metabolism, ribosomal RNA processing/modification, protein translation, and surprisingly keratinization.. Dual inhibition of STAT3/5 using small molecule degraders abolished L-CTCL cell growth in vitro. Furthermore, upstream broad range kinase targeting through IQDMA, a newly classified multi-kinase inhibitor, revealed a pharmacologic opportunity to alternatively block the STAT3/5 pathway by inhibiting the PAK2 serine/threonine kinase, which was very effective in patient cells carrying STAT3/5 copy number gains and in vivo in reducing tumor growth and disease dissemination in an intradermal xenograft mouse model. In summary, we conclude that STAT3/5 and PAK2 are new therapy targets to be further explored in L-CTCL.

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Using global proteomics to investigate the effect of IQDMA treatment on Leukemic forms of cutaneous T-cell lymphomas (L-CTCL) cells

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Identification of p38 beta as a therapeutic target for the treatment of Sézary Syndrome

Project description:Cutaneous T-Cell Lymphomas (CTCL) represent a group of hematopoietic malignancies that home to the skin and have no known molecular basis for disease pathogenesis. Sézary syndrome (SS) is the leukemic variant of CTCL. Currently, CTCL is incurable, highlighting the need for new therapeutic modalities. We have previously observed that combined small-molecule inhibition of protein kinase C (PKC) β and glycogen synthase kinase 3 (GSK3) causes synergistic apoptosis in CTCL cell lines and patient cells. Through microarray analysis of a SS cell line, we surveyed global gene expression following combined PKCβ-GSK3 treatment to elucidate therapeutic targets responsible for cell death. Clinically relevant targets were defined as genes differentially expressed in SS patients that were modulated by combination-drug treatment of SS cells. Gene set enrichment analysis uncovered candidate genes enriched for an immune cell signature, specifically the T-cell receptor and MAPK signaling pathways. Further analysis identified p38 as a potential therapeutic target that is over-expressed in SS patients and decreased by synergistic-inhibitor treatment. This target was verified through small-molecule inhibition of p38 leading to cell death in both SS cell lines and patient cells. These data establish p38 as a new SS biomarker and potential therapeutic target for the treatment of CTCL. Hut78 cells were treated with 4μM Enzastaurin, 5μM AR-A014418, 4μM Enzastaurin & 5μM AR-A014418, DMSO, or no treatment for three days. RNA was extracted and hybridized to Illumina microarrays.

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Aurora-A phosphorylates splicing factors and regulates alternative splicing

Project description:The goal of this study is to identify the effect of inhibition of Aurora-A kinase activity on gene expression and RNA splicing. The perturbation of Aurora-A is well known to affect cell cycle distribution. Therefore, we coupled the inhibition of Aurora-A with cell synchronization procedure in order to avoid the indirect effect of cell cycle perturbation on splicing changes. The mRNA -seq libraries were prepared and subjected to paired-end sequencing on Illumina HiSeq 2500 lanes. Differential gene expression and splicing analysis were carried using the edgeR tool and VAST-tools respectively. The RNA seq analysis identified that pharmacological inhibition of Aurora-A affects alternative splicing of 505 genes while having a marginal effect on gene expression. Overall our work identified Aurora-A as a novel splicing kinase and for the first time, describes a broad role of Aurora-A in regulating alternative splicing.

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2017-07-01 | E-MTAB-1210 | biostudies-arrayexpress

RNA seq_A375 gSMARCB1 + A549 etoposide, Aurora kinases inhibitors treated

Project description:To study the senescence gene signatures in the cells, which were genetic SMARCB1 depleted or treated with aurora kinase inhibitors or etoposide, we performed next generation RNA sequencing on these cell, and 'FRIDMAN_SENESCENCE_UP' geneset was used to determine the enrichment of senescence-related genes. The RNA sequencing results include (1) A375 cells and SMARCB1 depleted counterparts. (2) A549 cells and aurora kinase inhibitor (Alisertib, barasertib or tozasertib) or etoposide treated counterparts.

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