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MessagePosté le: Mer 20 Aoû - 10:55 (2014) Sujet du message: The cultivar Lota Sail had a recessive gene designated as x Répondre en citant

 It is actually doable that the resistance of RAS mutant tumour lines on this study and some others is the result of compensatory signalling by a parallel or non canonical pathway, this kind of as PI3K Akt AP24534 FLT-3 阻害剤 mTOR. Certainly, the importance of intact PI3K sig nalling has not long ago been established for Ras driven lung tumourigenesis in vivo. Interestingly, those cell lines with wildtype BRAF and RAS had been not all resistant to E6201 in contrast to previously published information, sug gesting that these cell lines might carry activation in the MAPK pathway as a result of further mechanisms, such as receptor tyrosine kinase or MEK1 activation. Probably only the combination of genome broad expres sion profiling, exome mutation information and phospho protein standing will allow us to unravel these complex pathway interactions and their relative roles in drug sensitivity.

Strangely, in spite of correlating BRAF mutational status to anti tumour exercise with E6201, phosphorylated ERK1 2 amounts didn't correlate AT-406 臨床試験 using the magnitude of cell development inhibition. Similarly, the cytostatic re sponse of melanoma cell lines to other MEK inhibi tors has been proven previously not to correlate with pERK ranges in advance of or after remedy. Taken together these benefits support the notion that the up stream mechanism of ERK activation is important in predicting sensitivity to MEK inhibition. These uncover ings also propose the cytostasis induced by MEK inhibition might be mediated by modulation of parallel signalling pathways potentially through ERK mediated auto regulatory processes.

To this finish, Gopal and co employees demonstrated diminished efficacy of MEK inhibition in melanoma cell lines because of PI3K pathway activation by way of a MEK IGF 1R mediated feed back loop. Consistent using the function of your MAPK pathway in G1 S transition, E6201 exerted cytostatic results, result ing in G1 arrest in vitro and tumour growth inhibition in vivo. E6201 also Akt2 阻害剤 induced cell death in the bulk of E6201 delicate cell lines. It could be interesting to per form a functional genomics screen in those cell lines that only showed growth arrest but not cell death to identify the genes or pathways that may be targeted alongside MEK to induce synthetic lethality. You can find earlier reports of MEK inhibitors resulting in cell death in the subset of delicate melanoma cell lines.

By way of example, CI 1040 treatment resulted in cell death in 1 from four melanoma cell lines evaluated, and cell death in melanoma cell lines has also been reported with its daughter compound, PD0325901. The MEK inhibi tor UO126 has also been reported to lead to caspase independent cell death in melanoma cell lines. Therefore, the cell death we see upon E6201 treatment displays the likely for MEK inhibition to consequence in cell death in the particular subset of melanoma cell lines. The cytocidal action of E6201, on the other hand, may also reflect the multi target nature of E6201, such the cell death observed is due to inhibition of other cancer certain kinases, such as Src. Without a doubt, while treatment of melanoma cell lines using the Src inhibitor dasatinib continues to be shown to inhibit proliferation and invasion, in some melanoma cell lines it did induce apoptosis. Whilst clinical responses are actually viewed inside a subset of individuals in Phase I and II trials of Dasatinib, biomar kers that predict sensitivity have not however been identified.

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MessagePosté le: Mer 20 Aoû - 10:55 (2014) Sujet du message: Publicité

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