In the present study we have investigated the molecular mechanisms leading to SU6656 induced polyploidy, cell death and senescence with focus on the probable cross reactivity with Aurora kinases in several cell lines, i. e. ES cells, MEFs, and NMuMG Fucci cells. Upon coverage all screened cell lines display a similar result, morphologically the cells become very enlarged and flattened, and the increase in size for the first couple of days subsequently accompanied by multinucleated pattern formations. Within a few minutes of exposure the cells fail to undergo mitosis. Certainly, also cells that morphologically look like Dizocilpine 77086-21-6 in late stage mitosis at the start of coverage fail daughter cell separation and cytokinesis. Apparently, as a certain SFK inhibitor from a number of well known providers although SU6656 is sold exclusively, Bain et al. showed in 2007 that SU6656 show clear crossreactivity at very low concentrations using the Aurora family of serine/threonine protein kinases. This family of kinases is known to play vital roles during mitosis, and the inhibition of said kinases has in-the literature demonstrated an ability to cause a similar result as described above for SU6656, raising the issue whether our results were caused by SFK inhibition or unspecific cross reactivity with Aurora kinases. Src, Yes, Fyn tripleknockout MEF cell line showed exactly the same reaction to SU6656 whilst the ES cells and wild type MEFs, to further throw doubt on results being due to inhibition of SFK. Aurora kinases were bothered by the second era specificity tested inhibitor SNS 314 and not too remarkably, to compare effects various various Meristem cell types were equally affected by the Aurora kinases and SU6656. We also received similar reactions with the Aurora kinase inhibitor VX680, but, this inhibitor has consequently been shown to cross react with SFKs and can’t be looked at to be specific enough to further strengthen our hypothesis. More over, we established that SU6656 quickly inhibit phosphorylation of histone H3 at 10, a genome wide quality of mitosis Carfilzomib 1140908-85-5 catalyzed by Aurora B kinase that plays an important position in chromosome condensation and segregation. These effects, together with our data showing that the effects caused by another Src family chemical PP2 obviously diverge from those of SU6656, indicate that the extended impairment of cell division observed with SU6656 in the present study are usually maybe not attributed to its inhibition of SFKs but rather the Aurora kinases. Frequently cells die either by apoptosis or necrosis soon after dysregulated/failed mitosis, often preceded by problem, a cell death style easily distinguishable because of its micro and/ or multinucleation.