Chromosome segregation errors: a double-edged sword - TI Pharma

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Chapter 6 Aneuploid tumor cells are more sensitive to inhibitors of the mitotic checkpoint kinase Mps1 Aniek Janssen 1,2 , Husam Alwan 2 , Björn ter Horst 2 , Ute Boon 3 , Rita Maia 1 , Joost C.M. Uitdehaag 4 , Jos de Man 4 , Geert J.P.L. Kops 2,5 , Rogier C. Buijsman 4 , Jos Jonkers 3 , Guido J.R. Zaman 4 , René H. Medema 1,2 1 Division of Cell Biology, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands 2 Department of Medical Oncology and Cancer Genomics Center, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands 3 Division of Molecular Cell Biology, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands 4 Netherlands Translational Research Center B.V., P.O. Box 20, 5340 AG, Oss, the Netherlands 5 Department of Molecular Cancer Research, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, the Netherlands Manuscript in preparation 115 Mps1 inhibition kills aneuploid cells 6
6 Abstract Developing anti-tumor therapies that display sufficient tumor selectivity remains a major challenge. We have previously shown that depletion of the mitotic checkpoint kinase Mps1 compromises cell viability and demonstrated that the anti-proliferative effect of Mps1 knockdown is directly correlated with the induction of chromosome segregation errors. In this report, we investigate in the use of Mps1 inhibition as an anti-cancer strategy using a previously unrecognized specific small molecule inhibitor of Mps1 (compound-5). We show that compound-5 compromises cell viability through the induction of severe chromosome segregation errors that subsequently result in excessive aneuploidy and DNA damage. Moreover, we find that transformed cells need more time to establish proper chromosome attachments to the mitotic spindle, resulting in a higher sensitivity to inhibition of Mps1 than nontransformed cells. Further analysis also reveals bioactivity of compound-5 in mice. Our data suggest that Mps1 is an attractive candidate for future anti-cancer studies. 116
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Chromosome segregation errors: a do
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Chromosome segregation errors: a do
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Get up, stand up, stand up for your
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Chapter 1 General Introduction Anie
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cytoplasms and pinches off the memb
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which sister-chromatids are not pro
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Non-MCC members, but important mito
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completely separated. Following cle
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Two striking features of cancer cel
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predisposition at a very young age,
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that aberrant spindle formation inc
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(Fig.7C). As discussed in section 4
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Thesis outline Chromosome segregati
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286,395,407,408 Increase (thymus) I
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2 Abstract Various types of chromos
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2 34 A C D E % of cells Control 100
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2 assess whether cytokinesis induce
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2 A Asynchronous Monastrol release
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2 for 14 hours (unless indicated ot
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2 Immuno Blotting Cells were lysed
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2 Supplemental figures 44 A B C % o
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2 A MCF7 B C 53BP1 foci/cell 46 % o
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2 A siLuc siATM C 48 p-S1981 ATM me
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2 50 A B C % of EdU positive cells
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Chapter 3 Studying Chromosomal inst
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Introduction Aneuploidy is a common
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activity by ~80% 170-172 . With the
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A WT/CiMKi T649A Embryo’s: Figure
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control treated MEFs (unpaired t te
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Materials and Methods Cloning targe
Page 66 and 67: - Loop out BamHI site with site-dir
Page 68 and 69: Primers: pGH_pA_FW#2: TCTATGGCTTCTG
Page 70 and 71: was prepared using standard procedu
Page 72: 71 Cre-inducible Mps1 knock-in mous
Page 75 and 76: 4 Abstract Most of the current drug
Page 77 and 78: 4 Two other interesting mitotic tar
Page 79 and 80: 4 inhibition of the anti-apoptotic
Page 81 and 82: 4 cluster their centrosomes. This
Page 83 and 84: 4 of checkpoint function can be ach
Page 85 and 86: 4 4.5 Disadvantages of exploiting m
Page 88 and 89: Chapter 5 Elevating the frequency o
Page 90 and 91: Introduction Error-free chromosome
Page 92 and 93: Partial depletion of Mps1 or BubR1
Page 94 and 95: death is not induced in the short t
Page 96 and 97: had survived growth for 7 days in t
Page 98 and 99: The following antibodies have been
Page 100 and 101: Supplemental data Supplemental figu
Page 102 and 103: A BubR1 α-tubulin Hela-TetRBubR1 -
Page 104 and 105: - doxycycline + doxycycline - doxyc
Page 106 and 107: A B C percentage of cells % PI posi
Page 108 and 109: Abstract One of the most common hal
Page 110 and 111: clear accumulation of cells in mito
Page 112 and 113: the mice did not receive any doxycy
Page 114 and 115: 113 Chromosome missegregations kill
Page 118 and 119: Introduction Equal segregation of t
Page 120 and 121: S1A, data not shown). Based on thes
Page 122 and 123: A B U2OS + H2B-YFP percentage of ce
Page 124 and 125: tumor cells, leaving diploid cells
Page 126 and 127: A B p-S10-Histone H3 DAPI C µmol/l
Page 128 and 129: Supplemental Figure-1. Protein bioc
Page 130 and 131: Bioavailability of compound-5 after
Page 132: A B U2OS (7.5nM) Hela (10nM) RPE-1
Page 135 and 136: 7 Abstract Taxanes, such as docetax
Page 137 and 138: 7 of mitotic aberrations. These dat
Page 139 and 140: 7 A Low CFP lifetime High CFP lifet
Page 141 and 142: 7 docetaxel treatment in vitro resu
Page 143 and 144: 7 chromosome unstable, which means
Page 145 and 146: 7 Cells (~50.000/well) were plated
Page 147 and 148: 7 Supplemental data Supplemental fi
Page 149 and 150: 7 148
Page 151 and 152: 8 Thesis summary Unequal separation
Page 153 and 154: 8 exerted through contraction of th
Page 155 and 156: 8 1.4 NoCut: preventing the inducti
Page 157 and 158: 8 tumorformation using intravital i
Page 160 and 161: Addendum References Nederlandse sam
Page 162 and 163: 41. McEwen, B.F., et al., CENP-E is
Page 164 and 165: 2010. 6(5): p. 359-68. 124. Liu, S.
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210. Stucki, M., et al., MDC1 direc
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tumors in mice. Cancer Res, 2007. 6
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adiotherapy in breast cancer. Breas
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470. Marcus, A.I., et al., Mitotic
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559. Kienitz, A., et al., Partial d
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Nederlandse Samenvatting Celdeling,
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verdeling van tumorcellen compleet
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Publications A. Janssen, R.H.Medema
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En dan zijn er nu nog een aantal li
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promotie-stukjes! Je bent een voorb
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edankt voor al jullie hulp bij de i
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Chromosome segregation errors: a double-edged sword - TI Pharma

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