However, even more striking effects were obtained in the presence of DHPCC 9, w

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 However, even more striking effects were obtained in the presence of DHPCC 9, w Empty However, even more striking effects were obtained in the presence of DHPCC 9, w

Post  jy9202 on Fri Apr 11, 2014 5:16 am

In addition, Pim 1 but not Pim 2 was shown to regulate homing and migration of bone marrow cells, possibly via phosphorylation mediated modification of CXCR4 expression on cell surface, Yet the exact substrates and signalling pathways INNO-406 溶解度 that all three Pim kinases regulate to enhance motility of adher ent cancer cells remain to be elucidated. Interestingly, the NFATc transcription factors that we have previously identified as Pim targets have recently been impli cated in tumor cell migration and invasion as well as tumor angiogenesis, Constitutively active NFATc isoforms have been shown to promote induction and progression of both hematological malig nancies and solid tumors by driving synthesis and secre tion of pro angiogenic factors as well as factors promoting cell moti lity, Thus, these NFATc dependent effects are expected to be enhanced in tumor cells overexpressing Pim kinases.

Indeed, our data indicate that Pim inhibitors can block the pro migratory effects Lapatinib 分子量 of NFATc factors in prostate cancer cells, suggesting that regulation of NFATc activ ity may be one of the mechanisms how Pim kinases pro mote cancer cell motility. Conclusions Altogether, our data indicate that Pim kinases can sti mulate migration and invasion of adherent cancer cells, possibly via NFATc factors. Therefore, the novel Pim kinase inhibitor DHPCC 9 is not only an efficient tool for Pim research, but also a promising compound for cancer drug development and could be targeted espe cially to inhibit invasiveness of Pim overexpressing can cer cells.

The ability of malignant cells to escape from a primary tumour mass and migrate to distal sites to form meta static tumors is the cause of mortality in the majority of carcinomas, including breast carcinoma. Approximately 20% of breast cancers belong to the Luminal B genetic subtype, typified by estrogen receptor positivity and a slow, steady rate of recurrence over time despite anti estrogen LY2109761 700874-71-1 therapy, Estrogen is known to increase the expression of MUC1, a well characterized member of the mucin family of glycoproteins, and a correlation has been demonstrated between MUC1 expression, resistance to anti estrogen therapy and metastatic beha viour, We have been investigating the mechanism of cell migration in the Luminal B breast cancer cell lines MCF7 and T47D, and were the first to demonstrate that MUC1 mediates heterotypic cell cell adhesion by bind ing ICAM 1, which is expressed on peritumoral stro mal and endothelial cells.

Subsequently, we demonstrated that ICAM 1 binding triggers calcium oscillations which may activate proteins involved in focal adhesion disassembly and cell contraction. In keeping with this, we further reported that after interaction with ICAM 1, transendothelial migration invasion in MUC1 expressing cells is associated with increased MUC1 Src association, MUC1 cytoplasmic domain phosphorylation, CrkL recruitment, and Rho GTPase mediated cytoskeletal rearrangement, MUC1 is expressed apically on normal breast epithelia, but often loses this polarization and becomes underglycosylated in breast cancer, MUC1 is translated as a single poly peptide, followed by conformational stress induced clea vage resulting in a heterodimer of non covalently associated extracellular and cytoplasmic portions, The extracellular portion consists of a vari able number of 20 amino acid tandem repeats con taining multiple sites for O glycosylation, which impart a negative charge and result in a structure that can extend up to 500 nm from the cell surface.


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