LIFE01200604005 Shri Somnath Ghosh - Homi Bhabha National ...

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CHAPTER 3 RESULTS 3.1.9 Stabilization of DNA-PK mRNA mRNA stability plays a major role in gene expression in mammalian cells, affecting the rates at which mRNAs disappear following transcriptional repression and accumulate following transcriptional induction. An array of exogenous factors, from hormones to viruses to radiation, influence mRNA halflives in ways that are incompletely understood. It was of interest to look for the stabilization of different mRNA in A549 cells exposed to fractionated irradiation. The activation of DNA-PK was accompanied by the stabilization of its mRNA in A549 cells that had been exposed to fractionated irradiation (Fig. 3.1.9). The ATM and Rad 52 mRNA were not stabilized indicating a specific and selective stabilization of DNA-PK mRNA. Very little is known about the signaling pathways regulating mRNA turnover in contrast to current understanding of how signaling pathways regulate transcription. Recently, however, several studies have provided increasing support for the notion that mRNA stability is regulated through signal transduction pathways involving phosphorylation events. It was of interest to look for the role of signal transduction pathway in the regulation of mRNA stabilization of DNA-PK. DNA- PK mRNA stabilization was found to be regulated by the p38 MAP Kinase pathway but not by ERK or JNK MAP Kinase pathway (Fig. 3.1.9). 135
CHAPTER 3 RESULTS y Relative expression of DNA-PK 30000 25000 20000 15000 10000 5000 0 2h+Act 2h+Act+In 4h+Act 4h+Act+In 6h+Act 6h+Act+In 8h+Act 8h+Act+In Time (h) 2 2 4 4 6 6 8 8 Actinomycin (5mg/ml) + + + + + + + + p38 MAPK inhibitor (1µM) - + - + - + - + DNA-PK Fig.3.1.9 Stabilization of DNA-PK mRNA in A549, that had been exposed to 2 Gy of 60 Co γ- irradiation daily over a period of 5 days and its stabilization is control by p38 MAP Kinase. 3.1.10 Role of Rad52 and MLH1 Since there was an intense activation of Rad52 and MLH1 in A549 cells exposed to fractionated irradiation, it was of interest to look for their role in survival of A549 cells. MLH1 and Rad52 gene expression knockdown was carried out in A549 cells using MLH1 and Rad52 shRNA plasmids. Stably transfected cells were selected and the transfection efficiency was found to be 85% for MLH1 gene and 80% for Rad52 gene. There was 48±2.8% survival of A549 cells exposed to fractionated irradiation. The survival of A549 cells that had been transfected with MLH1 shRNA plasmid and exposed to fractionated irradiation was found to be 40±1.8% where as the survival of A549 cells that had been transfected with Rad52 shRNA plasmid and exposed to fractionated irradiation was found to be 136
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RADIATION INDUCED SIGNALING IN MAMM
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DECLARATION I, hereby declare that
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CONTENTS Page No. SYNOPSIS………
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2.11 Measurement of NO production
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PREAMBLE SYNOPSIS Ionising radiatio
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SYNOPSIS Aims and Objectives: To St
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SYNOPSIS 2.6 Immunofluorescence sta
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SYNOPSIS ATM gene expression, which
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SYNOPSIS Percentage Survival 100 80
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SYNOPSIS Ratio of Rad52 to Actin Ra
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Relative Phosphorylation 45 40 35 3
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SYNOPSIS Fig. 3.3A Clonogenic Cell
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SYNOPSIS (A) Av No. of phospho BRCA
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SYNOPSIS Percentage Survival 120 10
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SYNOPSIS Fig.3.4B. Existance of cro
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SYNOPSIS Fig. 3.4EDNA damage in EL-
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SYNOPSIS subsequent cytotoxicity ca
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SYNOPSIS [4] Hall, E. J. Radiobiolo
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CHAPTER 1 INTRODUCTION INTRODUCTION
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CHAPTER 1 INTRODUCTION 15.8% 9.56%
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CHAPTER 1 INTRODUCTION far apart an
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CHAPTER 1 INTRODUCTION and are more
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CHAPTER 1 INTRODUCTION 1.3 DNA dama
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CHAPTER 1 INTRODUCTION associates w
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CHAPTER 1 INTRODUCTION are unable t
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CHAPTER 1 INTRODUCTION Perhaps one
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CHAPTER 1 INTRODUCTION occurs at DS
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CHAPTER 1 INTRODUCTION related prot
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CHAPTER 1 INTRODUCTION damage must
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CHAPTER 1 INTRODUCTION At the prese
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CHAPTER 1 INTRODUCTION predominant
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CHAPTER 1 INTRODUCTION provide a me
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CHAPTER 1 INTRODUCTION hypersensiti
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CHAPTER 1 INTRODUCTION cycle-specif
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CHAPTER 1 INTRODUCTION 1.4 Overview
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CHAPTER 1 INTRODUCTION 1.4.1 Radiat
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CHAPTER 1 INTRODUCTION interaction
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CHAPTER 1 INTRODUCTION p90S6 kinase
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CHAPTER 1 INTRODUCTION CD4 (formerl
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CHAPTER 1 INTRODUCTION unrepaired d
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CHAPTER 1 INTRODUCTION well to the
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CHAPTER 1 INTRODUCTION 1.6 Radiatio
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CHAPTER 1 INTRODUCTION becomes pote
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CHAPTER 2 MATERIALS AND METHODS MAT
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CHAPTER 2 MATERIALS AND METHODS 2.2
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CHAPTER 2 MATERIALS AND METHODS res
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Page 96 and 97: CHAPTER 2 MATERIALS AND METHODS PBS
Page 98 and 99: CHAPTER 2 MATERIALS AND METHODS the
Page 100 and 101: CHAPTER 2 MATERIALS AND METHODS 2.1
Page 102 and 103: CHAPTER 3 RESULTS RESULTS 93
Page 104 and 105: CHAPTER 3 RESULTS fractionated regi
Page 106 and 107: CHAPTER 3 RESULTS On comparison of
Page 108 and 109: CHAPTER 3 RESULTS Table 3.1.2A List
Page 110 and 111: CHAPTER 3 RESULTS 80 NM_002185 IL7R
Page 112 and 113: CHAPTER 3 RESULTS SAA2 149 AU134977
Page 114 and 115: CHAPTER 3 RESULTS 221 LOC643167 RNA
Page 116 and 117: CHAPTER 3 RESULTS 299 BF244402 FBXO
Page 118 and 119: CHAPTER 3 RESULTS CDK4) 57 AU152107
Page 120 and 121: CHAPTER 3 RESULTS 134 AL045793 METT
Page 122 and 123: CHAPTER 3 RESULTS 58 AF237813 ABAT
Page 124 and 125: CHAPTER 3 RESULTS 127 AI809749 ORMD
Page 126 and 127: CHAPTER 3 RESULTS 31 BE615699 UNC84
Page 128 and 129: CHAPTER 3 RESULTS 47 AF026303 SULT1
Page 130 and 131: CHAPTER 3 RESULTS 117 BF062193 CYor
Page 132 and 133: CHAPTER 3 RESULTS 187 AL036662 ---
Page 134 and 135: CHAPTER 3 RESULTS 52 AV686514 EMP2
Page 136 and 137: CHAPTER 3 RESULTS exposed to 10 Gy
Page 138 and 139: CHAPTER 3 RESULTS Fig.3.1.4 Gene ex
Page 140 and 141: CHAPTER 3 RESULTS Fig. 3.1.6 Radiat
Page 142 and 143: CHAPTER 3 RESULTS Fig. 3.1.7 Transl
Page 146 and 147: CHAPTER 3 RESULTS 23±1.5% (Fig. 3.
Page 148 and 149: CHAPTER 3 RESULTS whereas only the
Page 154 and 155: CHAPTER 3 RESULTS with equal doses
Page 156 and 157: CHAPTER 3 RESULTS Fig.3.3.1.2 Forma
Page 158 and 159: CHAPTER 3 RESULTS Fig.3.3.1.3 Phosp
Page 160 and 161: CHAPTER 3 RESULTS (7.5±0.64) (Fig.
Page 164 and 165: CHAPTER 3 RESULTS Fig.3.3.1.7b Phos
Page 166 and 167: CHAPTER 3 RESULTS 3.3.2 Oxygen beam
Page 168 and 169: CHAPTER 3 RESULTS in all the cells.
Page 170 and 171: CHAPTER 3 RESULTS 3.3.2.3 Radiation
Page 176 and 177: CHAPTER 3 RESULTS Fig.3.3.2.7 Apopt
Page 178 and 179: CHAPTER 3 RESULTS PMA stimulated U9
Page 180 and 181: CHAPTER 3 RESULTS Fig.3.4.2. Exista
Page 182 and 183: CHAPTER 3 RESULTS up-regulation of
Page 184 and 185: CHAPTER 3 RESULTS Fig.3.4.3.2 NO pr
Page 186 and 187: CHAPTER 3 RESULTS 3.4.3.4 Apoptotic
Page 188 and 189: CHAPTER 3 RESULTS 3.4.4 Bystander e
Page 190 and 191: CHAPTER 3 RESULTS Fig.3.4.4b DNA da
Page 192 and 193: CHAPTER 3 RESULTS Fig.3.4.5a Gene e
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CHAPTER 4 DISCUSSION DISCUSSION 185
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CHAPTER 4 DISCUSSION directly expos
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CHAPTER 4 DISCUSSION dose is delive
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CHAPTER 4 DISCUSSION A clear cause
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CHAPTER 4 DISCUSSION 4.2 Proton bea
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CHAPTER 4 DISCUSSION Although the e
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CHAPTER 4 DISCUSSION Similar number
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CHAPTER 4 DISCUSSION the mechanism
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CHAPTER 4 DISCUSSION Thus unlike th
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CHAPTER 4 DISCUSSION different from
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CHAPTER 4 DISCUSSION upregulates ma
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CHAPTER 4 DISCUSSION Numerous studi
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CHAPTER 4 DISCUSSION inhibition of
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CHAPTER 4 DISCUSSION The survival o
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CHAPTER 5 REFERENCES [1] Khan, F. T
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CHAPTER 5 REFERENCES [19] Woo, R. A
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CHAPTER 5 REFERENCES [35] Nghiem, P
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CHAPTER 5 REFERENCES [52] McKay, B.
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CHAPTER 5 REFERENCES [69] Cary, R.
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CHAPTER 5 REFERENCES [84] Uziel, T.
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CHAPTER 5 REFERENCES [98] Liu, Y.;
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CHAPTER 5 REFERENCES [111] Fei, P.;
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CHAPTER 5 REFERENCES [127] Frank, K
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CHAPTER 5 REFERENCES [141] Pierce,
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CHAPTER 5 REFERENCES [156] Roots, R
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CHAPTER 5 REFERENCES [171] Xia, Z.;
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CHAPTER 5 REFERENCES (MAP) kinase c
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CHAPTER 5 REFERENCES phosphorylatio
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CHAPTER 5 REFERENCES [211] Anderson
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CHAPTER 5 REFERENCES [229] Konca, K
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CHAPTER 5 REFERENCES [245] Kastan,
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CHAPTER 5 REFERENCES [261] Miralbel
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CHAPTER 5 REFERENCES [278] Weizman,
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CHAPTER 5 REFERENCES [294] Zhou, H.
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PUBLICATIONS AND PRESENTATIONS Publ
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Mutation Research 729 (2012) 61-72
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S. Ghosh, M. Krishna / Mutation Res
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12 S. Ghosh et al. / Mutation Resea
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Cancer Invest Downloaded from infor
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1568 I. J. Radiation Oncology d Bio
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