Short-term in vitro assays for long term toxicityShort-term in vitro assays for long term toxicity A...
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Short-term in vitro assays for long term toxicity
A specific targeted research project (STREP) within the VI EU Framework Research Program(Thematic priority: LifeScieHealth LSH-2002-1.2.3-2)
With the participación of groups from:
Austria, Belgium, France, Germany, Ireland, Italy, The Netherlands, Spain and Switzerland
Contract nº LSHB-CT-2004-504761Contract nº LSHB-CT-2004-504761
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LiverLiver and kidneykidney are among the most frequently affected
organs by compounds (drugs) acting as chronic toxins.
It is consequence of their active involvement in the
metabolism and clearance of xenobiotics.
Both organs possess a tissue structure resulting in
significant gradient concentrations of xenobiotics and,
hence, differential toxicity.
Their functional integrity is essential for the homeostasis,
being involved in the regulation of the energetic metabolism,
water balance, acid-base balance etc.
Clinical relevance of drug organ toxicity
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ToxinToxin
A)A) Directly related to the mechanism of damage:Directly related to the mechanism of damage:Functional inhibition of a transporter, inhibition of an enzyme,
transcription blocking
B)B) Defence against injury:Defence against injury: Changes in gene expression such
as SOD, stress proteins, inflammatory response.
C)C) Adaptative metabolic changes:Adaptative metabolic changes: Re-routing of energetic
metabolism, service functions.
D)D) EpiphenomenaEpiphenomena:: Changes (in some cases very striking), but
without a clear relation to the mechanisms of toxicity.
Rel
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nship
wit
h t
he
mec
han
ism
of
Rel
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wit
h t
he
mec
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of
toxic
ity
toxic
ity
EndEnd--point parameters and their relationship to the mechanism of toxicitypoint parameters and their relationship to the mechanism of toxicity
changeschanges
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Toxins ToxinToxin 1 1 ToxinToxin 2 2
GenomeProteomeCytome
GenomeProteomeCytome
AA
BB
PrimaryPrimary
EpiphenomenaEpiphenomena
SecondarySecondary
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Parameters affected in the course of toxic phenomena and their relevance
100%0%
Relationship to the mechanism of toxicity
ValueHigh(10x)
Med.(3x)
Low(1x)
Algorithm (numeric value):
Rating/scale of classificatio
100%0%
Nr. changed parameters
PrimaryPrimary SecondarySecondary EpiphenomenaEpiphenomena
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Final Final objectiveobjective::
““a a rating algorithm to identifyrating algorithm to identify
potential chronic toxinspotential chronic toxins......””
eRatingValuxVPxVPxVPn m l
=++1 1 1
332211
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Workpackage 6Workpackage 6
Database generation.
Analysis of model
predictivity.
Prevalidation.
Workpackage 1Workpackage 1
Liver cell model developments
Workpackage 4Workpackage 4
Mechanistically
based gene
markers
identification (Liver)
Workpackage 3Workpackage 3
Optimisation of
analysis tools
Workpackage 2Workpackage 2
Kidney cell system
developments
Workpackage 5Workpackage 5
Mechanisms of
nephrotoxicity
and identification
of toxicity
markers.
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0 6 12 18 24 30 36
WP1
WP2
WP3
WP4
WP5
WP6
Month
1.1 1.11.2 1.2
1.3 1.3
2.1
2.2
2.3
3.1
3.2
4.1
4.2
4.3
5.1
5.2
5.3
6.1
6.2 6.3 6.4
6.5 6.6
6.7 6.8
3.3
1st. report
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WP 1: Liver Cell Model Developments
Objectives:
1. To improve phenotype stability in 3D-collagen cultures. Counteracting
dedifferentiation of organotypic 3D-cultures of (rat/human)
hepatocytes by molecules acting on chromatin structure and/or by key
liver-enriched transcription factors.
2. Generation of stable differentiated human hepatocellular cell lines
by transfection with key liver-enriched transcription factors and
nuclear factors
3. Generation of functional human hepatocytes through adult stem cell
technology.
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Research conductedResearch conducted
Primary aim:
to find a functional long-term hepatocyte culture system
2. Drastic genotypic changes (H.J. Ahr)
1. Problems with cytomic analyses concerning penetration of
substrates (FFA) into the gel (partner 1)
Collagen
cultures
transfectedHepG2
HDAC-ITSA/Jung-1
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Temporal stability of hepatocyte culture models
Gene expression in in vitro cultures Gene expression in in vitro cultures –– in vivo (Liver) in vivo (Liver)
DC,NC_d0
PCA - RG_U34A - QS p0.06
H4
NC_d3,5
SM_d1-7
DC_d3-7
LivLiv
Cells
DC,NC_d1
Analysis of gene expression profile(present genes) in rat hepatocytes:
• liver in vivo• freshly isolated hepatocytes (cells)• culture on uncoated plates (NC)• dry collagen culture (DC)• sandwich culture (SM)• H4 hepatoma cells
Some culture models tend to “stabilize” , but on a very different
expression pattern as compared to the liver in vivo
H.J. Ahr-
Explore possibility of 1 layer dry collagen culturesExplore possibility of 1 layer dry collagen cultures
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LIVERLIVER
Chromatin compactation
Genes are Genes are not expressednot expressed!!
RationaleRationale
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Strategy:
Transcriptional repression Transcriptional activation
AcAc
Ac
Ac
AcAc
Ac
Ac
Ac
Ac Ac
Ac
Ac
Ac
Ac
Ac
Ac
Ac
N
N
N
N
N
N
N
N
N
N
N
HDAC
HAT
Deacetylation of histones results in a greater compactation
of chromatin and gene repression
HDAC-I
TSA
(and analogs)
H
CH3
C 3
N
O
NHOH
CH3CH3
O
*
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HDAC-I Treatment HDAC-I Treatment –– Experimental Setup Experimental Setup
+ 1 M TSA
ISOLATION:two-step collagenase
perfusion
CULTIVATION:Cp, DMEM (1 week)
SAMPLES:days 1, 4 and 7
(D1, D4, D7)
+ 1 M TSA - TSA
C2 C1 C0
Time of onset of treatment:
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HDAC-I Treatment HDAC-I Treatment –– Mechanisms Beyond Mechanisms Beyond
1. Connexin expression during hepatocyte isolation
dis
so
cia
tio
n
pu
rifi
cati
on
wash
1
wash
2 T0
dis
so
cia
tio
n
pu
rifi
cati
on
wash
1
wash
2 T0
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HDAC-I Treatment HDAC-I Treatment –– Mechanisms Beyond Mechanisms Beyond
Perfusion: TSA -
c-jun protein
c-jun RNA
28Sd
isso
cia
tio
n
pu
rifi
cati
on
wash
1
wash
2 T0
Perfusion: TSA +
dis
so
cia
tio
n
pu
rifi
cati
on
wash
1
wash
2 T0
2. c-jun expression during hepatocyte isolation
GAPDH
Bax
Bid
p53
p18
3. Apoptosis
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Choice of HDAC-I: Jung-1Choice of HDAC-I: Jung-1
Cx32
Cx43
Cx26
CYP2B1
EGF
TSA (1 M)+
++
-
48h
CYP1A1
EGF
Jung-1 (50 M)+
++
-
48h
CYP3A2
Cx26
Cx32
Cx43
+++
-
48h
CYP2B1
Jung-1 > TSA
Connexin and CYP expression
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LIVERLIVER
Genes are Genes are not expressednot expressed!!
ŒLack of expression and/or
non-functional
transcription factors
Genes are Genes are not expressednot expressed!! Altered expression of
key coregulators
RationaleRationale
Hepatic cell linesHepatic cell lines
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Liver CH MZ BC2 HepG2Hep3B
Rela
tive
0
100
200
300
C/EBP-beta
Liver CH Hep3B BC2 HepG2 MZ
Rela
tive m
0
50
100
150
200
250
SRC-2
Activatinf factors needed for hepatocytes to express their adult phenotype,
which are lacking in hepatoma of de-differentiated cells
0
50
100
150
200
250
C/EBP- HNF-3 HNF-1 HNF-4
TF
mR
NA
/-a
cti
n m
RN
A
(% o
f 2
4h
-he
pa
toc
yte
s)
Selected
Selected
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Generation of recombinant adenoviruses
for highly efficient transfection of cultured cells
Ad-GFPHuman hepatocytes
Calcium phosphate
co-transfection 293 cells
Recombinant adenovirus
Homologous
recombination
pAC -vector
8.8 Kbp
pJM17
40.3 Kbp
Cloning of cDNA
into pACCMV
cDNAcDNApCMVpCMV pApA
0.0-1.3
9.3 17.0 1009.3
Calcium phosphate
co-transfection 293 cells
Recombinant adenovirus
Homologous
recombination
pAC -vector
8.8 Kbp
pJM17
40.3 Kbp
Cloning of cDNA
into pACCMV
cDNAcDNApCMVpCMV pApA
0.0-1.3
9.3 17.0 1009.3
Cloning of cDNA
into pAC/CMV
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0
100
200
300
400
Control 100c/EBP15c/EBP45HNF3
100c/EBP150c/EBP
5HNF3
TSA
100c/EBP45c/EBP15HNF3
TSA
Un
its
mRNACYP3A4/mRNA hPBGD
pmol/mg prot
CYP 3A4 activity in transfected HepG2 cells
(CYP 3A4 substrate, midazolam)
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Hepatocytes from stem cells: (too?) many possibilitiesHepatocytes from stem cells: (too?) many possibilities
Mature
hepatocytes
Canal of
Hering
Biliary
cellsLIVER
transition
hepatocytes
Mesenchymal stem cell
Jiang et al. Nature 2002Jiang et al. Nature 2002
Thiese et al. Hepatol 2000Thiese et al. Hepatol 2000
Petersen et al. Science 1999Petersen et al. Science 1999
MAPC
Schwartz et al. JCI 2002Schwartz et al. JCI 2002
Verfaillie Trend Cell Biol 2002Verfaillie Trend Cell Biol 2002
embryonicembryonic
stem cellsstem cells
Lavon et al. 2004Lavon et al. 2004
Rambhatla et al. 2003Rambhatla et al. 2003
Alison et al.Nature 2000Alison et al.Nature 2000
Lagasse et al. Nat Med 2000Lagasse et al. Nat Med 2000
Zhao et al. PNAS 2003Zhao et al. PNAS 2003
Kakinuma et al. Stem Cell 2003Kakinuma et al. Stem Cell 2003
Hematopoietic
Stem cells
cell fusion?cell fusion?
Wang et al. Nature 2003Wang et al. Nature 2003
Vassilopoulos et al. Nature 2003Vassilopoulos et al. Nature 2003
IHPC
IHPC: intra hepatic progenitor cells (IHPC: intra hepatic progenitor cells (““oval cellsoval cells””?)?)
Tissue-specific
stem cells:
• pancreas
• brain
• muscle
Shen 2000; Fuchs 2000Shen 2000; Fuchs 2000
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Day 24 Prolif medium Day 24 Medium A Day 24 Medium BDay 0 confluenceProliferating cells
00 24 days24 days88 1616
medium B (Schwartz)medium B (Schwartz)
medium A (Selden - FBS)medium A (Selden - FBS)
proliferation medium (Selden)proliferation medium (Selden)
Selden medium: MEM Selden medium: MEM 10%FBS, HGF, EGF, TRH, etc.10%FBS, HGF, EGF, TRH, etc.
Schwartz medium: DMEM, FGF4, HGF, etc. Schwartz medium: DMEM, FGF4, HGF, etc.
platingplating
3.103.1055/60mm/60mm confluenceconfluence
proliferationproliferation
medium (Selden)medium (Selden)
In vitroIn vitro differentiation of IHPC differentiation of IHPC
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Albumin productionAlbumin production
00
200200
400400
600600
0-40-4 4-84-8 8-128-12 12-1612-16 16-2016-20 20-2420-24(days)(days)
Co
nc
en
tra
tio
n
Co
nc
en
tra
tio
n
(ng
/ml)
(ng
/ml)
1-51-5 1-5 1-5
Prolif mediumProlif medium Medium AMedium A
- -
0-40-4 4-84-8 12-1612-16 20-2420-24 4-84-8
medium Amedium A
00
PCHHPCHH
0-40-4 4-84-8 12-1612-16 20-2420-24 4-8 (days)4-8 (days)
PCHHPCHH
albuminalbumin
1-antitrypsin1-antitrypsin
fibrinogenfibrinogen
00
PCHHPCHH
Plasma protein production
Medium BMedium B
medium Bmedium B
AFP not detectableAFP not detectable
PCHHPCHH primary cultures of human hepatocytesprimary cultures of human hepatocytes
immunoblottingsimmunoblottings
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Metabolism enzyme mRNA expression
00
11
33
55 Glucose-6-Phosphatase
200200
400400
600600 CYP3A7
00
1.01.0
2.02.0
00
GSTp
00 88 1616 2424 2424 8888 1616 2424 (days)(days)88
AA PP PCHHPCHHBB
CYP3A4 not detectableCYP3A4 not detectable
Real time Q-PCRReal time Q-PCR
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WP3:Optimisation of tools and analyses
Development of new cytomic assays: cell-
based in vitro assays for steatosis
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1.Objectives of the study
2. Characterization of cell models
3.Lipid loading
4.Fluorescent probes for lipid detection
5. Fluorescent probes for functional assays
6.Results
Flow cytometric analysis of in vitro models of steatosis
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Human Hepatocytes
Bodipy Nile Red
Bodipy dye is more sensitive than Nile Red for the
analysis of intracellular lipids
---- Autofluorescence ---- BSA ---- Lipids+BSA
Summary of results
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Comparison of models as % of unloaded controls
0
50
100
150
200
250
300
350
400
control oleate tetracyclin
5 uM
tetracyclin
15 uM
amiodarone
10 uM
amiodarone
20 uM
valproate
2 uM
valproate
4 uM
model A % model B %
BO
DIP
Y M
EA
N F
LU
OR
ES
CE
NC
E (
% O
F C
ON
TR
OL)
Summary of results
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KidneyKidney::
Workpackage 2: Kidney cell system development
Workpackage 3: Optimisation of tools and analysis
Workpackage 5: Mechanisms of nephrotoxicity and
identification of toxicity markers
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WP 2: Kidney cell system developmentsWP 2: Kidney cell system developments
2.1 Development of cultures of renal cells2.1 Development of cultures of renal cells
2.2 Advanced culture techniques:2.2 Advanced culture techniques: co-cultures, perfusion culture modelso-cultures, perfusion culture models
2.3 Molecular biology studies on kidney cell differentiation 2.3 Molecular biology studies on kidney cell differentiation (P2, P5, P6, P7 and(P2, P5, P6, P7 and
P8)P8)
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Co-culture System Developed and Optimised
• HK-2 and human dermal microvascular endothelial cells (HMEC-1)
• Non-contact close proximity culture system – filter based
(WP 2)
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Co-culture of renal fibroblasts and tubular epithelial cells
HK2
TK173
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Morphological and phenotypical characterization of fibroblasts and
tubular epithelial cells in monoculture(WP 2)
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RENAL GROUPRENAL GROUP
WP 3: WP 3: Optimisation of tools and analyses
3.1 Improved genomic tools 3.1 Improved genomic tools
3.2 Assessment of protein profiles in cells3.2 Assessment of protein profiles in cells
3.3 Development of cytomics assays3.3 Development of cytomics assays
in progress
WP 5: WP 5: Mechanisms of nephrotoxicity and
identification of toxicity markers
Assays with model nephrotoxins:Assays with model nephrotoxins:
••CyclosporineCyclosporine
••RapamycinRapamycin
••FK506FK506
••OchratoxinOchratoxin A A
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Plastic vs co-culture
380 genes down regulated 2-fold or higher 1190
genes up-regulated 2-fold or higher
Filter vs co-culture
28 genes down regulated 2-fold or higher
36 genes up regulated 2-fold or higher
Deliverable 11 : Identification of changes in functionally relevant
genes and comparison between mono and co-culture systems under
static and perfusion culture conditions.
Plastic vs Filter
338 genes are down regulated 2-fold or higher
1159 genes up regulated 2-fold or higher
(WP 2)
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WP 2: Overview: suitability of different kidney culture models
cell line OTA treatment
Rat NRK-52E day 1 and day 3
Human HK-2 day 1 and day 3
primary cells time course OTA treatment
isolation by perfusion day 5, 7, 8, 10, 12 and 14 in culture vs rat kidney in vivo (only passage 0) day 1 and 3
proximal tubular fragments in vitro culture vs Human kidney in vivo (passage 1, cooperation with Innsbruck) day 1 and day 3
in vivo OTA treatment
rat kidney day 1, 3 and 7
Black: planned
Red: WP2 in progress
Blue: WP5 in progress
OTA: ochratoxin A
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Renal group: expansion to gene profiling
• Agreement of the renal group partners at the 6 month interim meetingto compare all the gene profiles identified in the advanced cellcuture models used in PREDICTOMICS to gene profiles establishedfor renal tissue (mostly comprised of renal proximal tubules) frome livegraft donors and renal biopsies available from studies ongoing inother EU-FP 5 anf FP 6 projects responsible partners P5, P6
• This should subserve two purposes:
1. to establish something like a "gold standard" for human renal
proximal tubular gene profiles
2. to identify genes relevant for risk assessment in nephrotoxicity
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Expression profiling: kidney in vivo vs cell culture systems
DedifferentiationBiotransformation
Membrane transport
Cellular metabolism
Acute effectsOxidative stress/DNA damage
Signaling
Immunity and defense
Proliferation, RegenerationApoptosis
Cell cycle control
DNA, RNA metabolism
Cytoskeleton, Cell adhesion
Proliferation
Cytoskeleton
Kidney PTC NRK
Defined cell reactions
are missing
• Genes:Those significantly de-regulated by OTA in vivo
• Kidney systems:
– Rat kidney in vivo treatedwith OTA (3 mg/kg/day)for 1, 3, and 7 days
– rPTCs treated with 20 MOTA for 1 and 3 days.
– NRK-52E treated with 20M OTA for 1 and 3 days
• All data are normalized tothe time-matched andappropriate controls.
OTA: ochratoxin A
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Control FK506 Rapa CsA
Hierarchical Clustering (Gene Tree)
of GeneChip Microarray data
Data was analysed using GeneSpring
Version 6.1. Samples were
normalised, flags were present in 6 out
of 10 samples, data was subject to
statistical analysis, ANOVA,
hierarchical clustering (gene tree) was
performed using the Pearson
correlation
(WP 5)Effects of nephrotroxins on Effects of nephrotroxins on gene gene expression expression inin
kidney cellskidney cells
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Control compared to Control compared to cyclosporin cyclosporin A, FK506 and A, FK506 and rapamycinrapamycin- treated HK-2 cells- treated HK-2 cells
Down regulated genesDown regulated genesUp regulated genesUp regulated genes
Up regulated genes ( 1.5 fold) Down regulated genes ( 1.5 fold)
LeidenLeiden 200 200
(DELIVERABLE 21):(DELIVERABLE 21):
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Toxins employed:
CsA and CdCl2
Measured Parameters:
LDH, AK, glucose, lactate,
GSH and GSSG
Deliverable 23: Development of online monitoring procedures for
measurement of epithelial solute transport and soluble renal cell
injury markers from perfusion media.
(WP 3)
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Deliverable 23: Development of online monitoring procedures for
measurement of epithelial solute transport and soluble renal cell
injury markers from perfusion media.
0 (O), 1 ( ) and 5 M ( ) CdCl2
(WP 3)
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Cyclosporin A (CsA) induced hydrogen peroxide production
indicative of ROS-mediated injury in HK-2 cells
(WP 5)
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Cyclosporin A (CsA) induced increased expression of phosphorylated
p53 in HK-2 cells
(WP 5)
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Management & DisseminationManagement & Dissemination
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