Thursday, October 17, 2013
suppressing neural differentiation enhancing growth capacity
it was noted that treatment of the cells with 17 DMAG induced an inferior molecular weight MIZ 1 protein as compared to that of MIZ 1 detected in MIZ 1 transfected cells. Additionally, shown in Fig. 8 were reproducible when various anti MIZ 1 antibodies were used. It should be noted that Dasatinib in line with the deduced amino acid sequence of MIZ 1, its estimated molecular weight is 88 kDa. To help ensure data shown in Fig. 8, we performed 2 D gel analysis using SKNAS and CHP134 treated with 17 DMAG. As shown in Fig. 17 DMAG did in fact encourage MIZ 1 protein in these cell lines, however the drug induced MIZ 1 protein had a smaller molecular weight and less post translational modifications as compared to that of the cells transfected with MIZ 1.
To date, there has been no record Organism to show that Hsp90 inhibition results in down-regulation of MYC and MYCN. In this study, we've shown that Hsp90 inhibition quickly destabilizes MYC and MYCN proteins in unfavorable neuroblastoma cells. Our suggest that MYC and MYCN are one of the Hsp90 client proteins, even though the exact mechanism by which Hsp90 inhibition triggers destabilization of MYC and MYCN is not clear. Moreover, the AKT pathway is well known to secure MYC and MYCN. Because treatment of neuroblastoma cells with 17 DMAG in down regulation of AKT, you could describe the destabilization of MYCN and MYC as a result of AKT inactivation. Our data also declare that there is yet one more mechanism for MYC and MYCN destabilization in neuroblastoma cells having an intact p53 pathway.
As described, inhibition of Hsp90 by 17 DMAG up regulates p53 expression and concomitantly destabilizes Gemcitabine MYCN and MYC. There is an inverse relationship between p53 expression and MYCN or MYC expression in 17 DMAG treated cell lines. This observation is in keeping with our previous study, which shows that a heightened p53 expression in a decreased MYCN expression in MYCN increased neuroblastoma cells. But, the identification of p53 targets that mediate the destabilization of MYCN and MYC in the neuroblastoma cells remains to be determined. In line with the data shown in Figs. 3 and 4, the induction of p21WAF1 is likely p53 dependent and p53 independent. It's not clear why CHP134 with all the whole p53 path, fails to stimulate expression in response to p53 induction mediated by Hsp90 inhibition.
Nevertheless, depending on our experience, it is more difficult to induce p21WAF1 protein expression in CHP134 by treatments when compared with other cell lines. Hence, the p21WAF1 reaction system to various environmental cues could be impaired in CHP134 cells. Hsp90 is famous to be key to the balance and purpose of many proteins that are very important to survival and growth of cancer cells. For this end, our study shows that Hsp90 inhibition also causes HDAC6 destabilization. It is known that HDAC6 is one of the tubulin deacetylases, and therefore, HDAC6 depletion by inhibition in super acetylation of tubulin.
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