therapeutic and diagnostic exposure challenges. brain effects
TRANSCRIPT
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THERAPEUTIC AND DIAGNOSTIC EXPOSURE CHALLENGES
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BRAIN EFFECTS
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INTRODUCTION
?Do bystander effects exist in the brain?
Cranial RT is a well-established treatment modality that is of paramount importance, and approximately 200,000 patients receive cranial RT yearly
RT leads to a variety of side effects including debilitating cognitive declines, learning and memory deficits, changes in visual motor processing, quantitative skills and attention
IR damages normal brain tissues through a variety of poorly understood mechanisms and results in profound cognitive impairment and significant life-long disability
IR can elicit molecular and cellular responses in cells and tissues that were not hit directly by IR but rather received a distress signal from irradiated cells – the bystander effects
Currently, there is a lack of comprehensive evidence on the existence and nature of bystander effects in the brain
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INTRODUCTION
IR was shown to affect hippocampus and the prefrontal cortex (PFC).
The hippocampus is one of the two active sites of neurogenesis in the mammalian brain. The hippocampus plays important role in memory.
The prefrontal cortex (PFC) the most anterior region of the frontal lobe, is involved in “executive” functions such as planning, decision-making, behavioural inhibition, and working memory.
These functions are affected post RT.
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METHODS
sham treated
head exposed
liver exposed
males females males femalesmales females
4 days 14 dayspost-exposure
Molecular analysis•Gene expression•Small RNA expression•DNA methylation•Protein analysis
Behavioral analysis Neuroanatomy
EXPERIMENTAL SET-UP
DOSE: 1 Gy
To the surface of the tray!
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METHODS
What is the precise dose to the brain?
The yellow oval indicates the approximate location of the oval hole in the lead shielding, i.e., the region exposed to the primary radiation. All other regions were
shielded.
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METHODS
DIRECT
LIVER IRVERY
SMALL DOSES!!
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METHODSNEUROANATOMYGolgi-Cox stained coronal sections were used to measure PFC thickness and to study spine density and dendritic morphology. Dendritic morphology (i.e. branching and length) reflects the organization of brain connectivity.
To measure spine density, the distal dendrites of individual neurons were traced from Golgi-Cox stained brain sections, using a camera lucida mounted on a microscope.
BEHAVIOURAL TESTINGWe used tasks sensitive to hippocampal and/or prefrontal injury - the object location memory task and the Morris water task
Object Location Memory Testing – to measure how well rats encode the location of particular objects among an array of objects
Morris Water Task – a well-established behavioural procedure widely used to study spatial learning and memory
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RESULTS
Effect of radiationHead Liver
Spines Branch length Spines Branch length
Par1AMale - - - - -
Female - - - -
Par1BMale - - - - - -
Female - - - - -
Cg3AMale * - - -
Female -
Cg3BMale - - -
Female - - - -
AIDMale - - - -
Female - -
HPCMale - - - -
Female - - * - -
Both head and liver irradiation affect morphology
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RESULTS
Effect of sex (being male)Head Liver
Spines Branch length Spines Branch length
Par1ANo radiation - - - - - -
Radiation - -
Par1BNo radiation - - - - - -
Radiation - - - -
Cg3ANo radiation * *
Radiation - -
Cg3BNo radiation - - - - - -
Radiation - - - *
AIDNo radiation - -
Radiation -
HPCNo radiation * - -
Radiation - - - -
Females are more affected than males
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RESULTS
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RESULTS
We also identified differentially expressed genes between treatments for 2 brain regions: prefrontal cortex and hippocampus
Treatments analysed: • sham-irradiated• liver-irradiated/brain bystander
Brain regions Females Males
Hippocampus - 1
PFC 22 1
No overlap between males and females
KEY RESULTS
A predicted gene (ENSRNOG00000043197) was the only DE gene found in PFC, hippocampus and cerebellum. It was strongly up-regulated in these brain regions.
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EFFECTS OF SCATTER IR ON THE BRAIN
0.115 cGy
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EFFECTS OF SCATTER IR ON THE BRAIN
0.115 cGy
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EFFECTS OF SCATTER IR ON THE BRAIN
FEMALES MALES
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EFFECTS OF SCATTER IR ON THE BRAIN
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EFFECTS OF SCATTER IR ON THE BRAIN
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EFFECTS OF SCATTER IR ON THE BRAIN
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Epigenetically mediated
They affect behavior
They are sex-specific
Studies are needed to analyze clinical repercussions of RT-induced effects
EFFECTS OF SCATTER IR ON THE BRAIN
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ACKNOWLEDGEMENTSCollaborators:
Bryan Kolb, CCBNGerlinde Metz, CCBNRobbin Gibb, CCBN
Richelle Mychasiuk, CCBN Arif Muhammad, CCBN
Shakhawat Hossain, CCBNGreg Silasi, CCBN
Esmaeel Ghassrodhashti, JACCCharles Kirkby, JACC
AJ Ghose, JACCIgor Kovalchuk/Bio
Youli Yao/BioOlena Babenko, CCBN
William Bonner, NCI/NIHOlga Martin, Peter Maccallum Cancer Center, AustraliaJacob Adserballe, the Family Pet Hospital of Lethbridge
Rochellys Diaz-Heijtz, Karolinska Uni, SwedenIgro Pogribny, NCTR
CIHR Institute of Gender and Health – Chair Program
Kovalchuk group
Slava Ilnytsky
Bo Wang
Dongping Li
Anna Kovalchuk
Rocio Rodriguez-Juarez
Rommy Rodriguez-Juarez
Andrey Golubov
Lidia Luzhna
Corinne Sidler
Rafal Woicicki
Dee Goyal
Alumni
Darryl Hudson
Jason Novak
Jan Tamminga
Kristy Kutanzi
Igor Koturbash
Mike Lowings
Jonathan Loree
James Meservy
Natasha Singh
Joel Stimson
Munima Alam
Paul Walz
Jody Filkowski
Matt Merrifield
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“Epigenetic profiling for the identification of novel targets for therapeutics in refractory leukemia in children”
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Cancer is the second most common cause of death, after accidents, in children
Pediatric cancers include
• Acute leukemia• Brain tumors• Lymphoma
• Neuroblastoma• Wilm’s tumor
• Rhabdomyosarcoma• Retinoblastoma• Osteosarcoma
• Ewing’s sarcoma
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The cellular components of the blood are derived from hematopoietic stem cells, which give rise to lymphoid stem cells
and myeloid stem cells
Myeloid stem cells differentiate into erythrocytes, platelets, monocytes, macrophages and eosinophils
Lymphoid stem cells differentiate into B-cells and T-cells
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Infant leukemia is:
Rare
Under-Researched
Acute (AML ~15%, ALL >80%)
Deadly
Devastating
Costly
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Sorting pediatric leukemia stem cells for genomic and epigenomic analyses
Blast
CD38 A750
CD34
FIT
C
100
101
102
103
104
100
101
102
103
104
34- 38+78.62%
34- 38-3.08%
34+ 38+16.70%
34+ 38-0.36%
Blast
CD38 A750
CD34
FIT
C
100
101
102
103
104
100
101
102
103
104
34- 38+91.23%
34- 38-7.44%
34+ 38+1.10%
34+ 38-0.10%
Blast
CD38 A750
CD34
FIT
C
100
101
102
103
104
100
101
102
103
104
34+ 38-12.22%
34+ 38+72.28%
34- 38-0.32%
34- 38+1.36%
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Conducting genomic, epigenomic and signalome analyses
OncoFinder TM is a unique platform that utilizes a variety of original algorithms to score intracellular signaling pathways, to analyze in a comprehensive way thousands of molecular interactions in cancer cells, and to model activity of anticancer drugs in cancer cells of an individual patient.
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VT vs normal = numerous pathways affected
2945 genes up-regulated, involved in:• cell cycle control• proliferation• DNA repair
2772 down-regulated, involved in:• deregulated apoptosis • deregulated differentiation • down-regulated immune response
RESULTS
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INCREASED PROLIFERATIVE CAPACITY
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ALTERED APOPTOSIS
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ERK1/2
pERK1/2
p38
PCNA
CYCLIN A
CYCLIN B
NOTCH
nor
mal
VT
VT
Cell cycle control, proliferation → pro-survival
Leukocyte differentiation
PROTEIN ANALYSIS CONFIRMS GENE EXPRESSION DATA
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MRE11
CASPASE 3
norm
al
VT
VT
DNA repair
Apoptosis Note: while caspase 3 is induced, it is not cleaved
KU70
γH2AX
PROTEIN ANALYSIS CONFIRMS GENE EXPRESSION DATA
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norm
al
VT
VT norm
al
VT
VT
DNMT1
DNMT3a
MeCP2
pH3
H3K9me3
H4K20me3
DNA methylation
Repressive histone modifications
EPIGENETIC CONTROL – RELATED PROTEINS
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Dr. James ThomasAnna Kovalchuk
Dr. Yaroslav IlnytskyyDr. Andrey Golubov
Ms. Rocio Rodriguez-Juarez
Dr. Aru NarendranDr. Karl Riabowol
Dr. Aarthi JayanthanDr. Yibing Ruan
Iwona Auer-GrzesiaDerrick Rancourt
Gregor ReidTony Truong
ACKNOWLEDGEMENTS
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ATM-Directed Precision Therapyin Non-Small Cell Lung Cancer
Lead: Gwyn Bebb
Team: Olga KovalchukSusan Lees-
MillerDon MorrisMing TsaoTyler Williamson
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832 Stage IV
56.1 % Referred to Medical Oncologist
50.7 % Saw a Medical Oncologist
23.1% Received Systemic Chemotherapy
362 Stage IIIA/B
37% Received Radical Chemo/Radiation
Systemic Treatment in Metastatic NSCLCTom Baker Cancer Centre (2003-2006)
Albertans with advanced NSCLC are under-treated
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0 50 100 150Survival (Months)
Palliative RT
Radical RT
Kaplan-Meier survival estimates, by chemort
63% MOS = 11.9 mo
37% MOS = 23.7 mo
Stage IV survival according to treatmentStage III survival according to treatment
Most often this is due to poor performance status
Precludes guideline-recommended treatment
Untreated Albertans with advanced NSCLC have poor outcomes
23% MOS 16 mo
3.7 mo
0 25 50 75Survival (Months)
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ATM: A critical gene for DNA repair
ATM ATM
DNA repairApoptosisCell cycle arrest
Cells with ATM Cells without ATM
Mutation accumulationGenetic instability
Cancer transformation
p53
DNA damaging agent
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ATM loss in cancers
Breast Cancer (40%)Poor overall survival
Head and Neck CancersPoor overall survival
Mantle Cell LymphomaIncreased radiation
sensitivitySynthetic lethality
Lung Cancer (22%)Poor overall survivalBetter chemo responseGastric Cancer
Increased radiation sensitivity
Synthetic lethality
Lung CancerIncreased radiation
sensitivitySynthetic lethalityChemo sensitivity
In the lab In the clinic
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ATM in resected NSCLC
22% of patients have low relative ATM associated with poorer survival outcomes
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CLUSTER 1 CLUSTER 2
Hierarchical clustering of global gene expression in NSCLC cell lines
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Pathways that are differentially expressed in cluster 2 as compared to cluster 1
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KEGG analysis of differentially regulated pathway - example of pathways and genes that are differentially expressed.
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