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Bridging the Divide- Using Digital Pathology to Guide Ultrastructural Pathology Evaluations.
GD Gagne, JH Decker and JA Fagerland. Preclinical Safety, Abbott Laboratories
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Overview
• Digital pathology at Abbott
• Ultrastructural pathology: Identification of pigment in liver and adrenal tissues
• Evaluating biomarkers of glomerular injury using TEM, laser capture microdissection
• Image analysis applications
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Digital Pathology at Abbott
• 2008- Digital pathology system (120-slide) installed in Pathology Department, Lake County, IL (LC)
• 2009
– 120-slide system installed in Ludwigshafen, Germany Pathology Department
– 6-slide scanner installed in LC Ultrastructural Pathology/Investigative Toxicology facility
– Added whole-slide image analysis capability, including pattern recognition software
• Applications: multisite slide sharing, global pathology teleconferencing, pathologist-to-pathologist consultation
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Ultrastructural Pathology
• Single global EM facility (LC)
• Transmission electron microscopy (TEM) evaluation used to further characterize histopathology findings
• TEM sections:1-2 mm2
LM sections: ≤8 cm2
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Bridging the divide between LM and TEM
• Digital pathology system allows:
–consultation between electron microscopist and pathologist to assure changes seen by histopath are present in sections taken for TEM
–comparison of H&E-stained histological sections for LM with toluidine blue-stained semithin sections for TEM
–interactively review by personnel at different sites
–example: Identification of pigment in liver and adrenal gland in a 12-month toxicity study in cynomolgus monkeys
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Evaluation of Pigment in Liver and Adrenal Tissues
• Twelve month toxicity study in cynomolgus monkeys
• Accumulation of pigment noted by LM in liver and adrenal gland from monkeys administered high dose of test compound (had not been seen in previous monkey tox studies)
• Liver and adrenal tissue was retrieved from formalin and sent to Abbott for EM evaluation
• Questions:
– Nature of the pigment
– Similarity to pigment seen in rats dosed with same compound
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Liver, high dose monkeyImages from digital slides of H&E and semithin sections
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Liver, high dose monkey, Kupffer cell,TEM images
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Liver, high dose monkey, endothelial cells
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Adrenal gland, high dose monkey. Semithin section image from digital slide.
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Adrenal gland, zona reticularis, high dose monkey
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Evaluating biomarkers of glomerular injury
• Purpose of Study- To determine if urinary biomarkers can provide a sensitive and accurate measurement of receptor tyrosine kinase (RTK) inhibitor-induced glomerular injury
• RTK inhibitors have been shown to cause proteinuria and glomerular injury (visible by EM) in experimental animals and humans in clinical trials
• TEM used to
– characterize glomerular changes
– correlate changes to biomarker measurements
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Protein Mechanism of Release into Urine Injury Site
AlbuminFreely filtered through the glomerular basement membrane, reabsorbed (and a fraction degraded) by the proximal tubule
Glomerular and tubular injury
Lipocalin-2 (NGAL)
Expressed and released in response to injury
Glomerular and tubular injury
OsteopontinExpressed and released in response to injury
Glomerular and tubular injury
KIM-1 (Kidney Injury Molecule-1)
Expressed and released in response to injury
Tubular injury
Biomarker Characteristics
Courtesy Y. Yang
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Individual Animal Biomarker Results- (specimens examined by TEM)
Total Albumin(ug)
Total Osteopontin
(ug)
Total Lipocalin (ng)
Total KIM-1 (ug)
1001a 87 0.6 1404.8 8.5
1003a 175.6 18.1 1896.1 9
4001b 3247.2 201.6 15389.9 20.4
4005b 4456.9 73.1 4506.2 11.6
a: Vehicle b: RTK Inhibitor, dosed for 7 days at 10 mg base/kg/day
Increase in albumin and lipocalin, but not KIM-1 suggests glomerular injury
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Compare H&E to semithin section at identical mags
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Locate features on EM monitor while viewing semithin section slide image (High dose kidney: Glomerulus)
Semithin section TEM Image
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
High Dose kidney: Glomerulus
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Conclusion
• TEM evaluation revealed glomerular changes consistent with RTK inhibition:
–Damage to capillary endothelium, loss of fenestrations
–Subendothelial electron-dense deposits
–Accumulation of electron-dense granules (protein) in podocytes
• TEM supported the biomarker results that indicated glomerular injury
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Laser capture microdissection (LCM) of glomeruli
• Collect glomeruli for gene expression analysis to correlate with biomarker changes
• Use LCM to collect tissue
• Use digital pathology system to document efficiency of laser capture
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Prepare stained tissue section (H&E, immunostains, etc.)
Align cap (with thermoplastic transfer film) over area of interest
Under microscope, locate cells to be dissected
Fire laser pulse to embed cells in thermoplastic film of cap
Lift cap to remove microdissected cells
Place cap in microfuge tube with appropriate extraction reagents for molecular analysis
Laser Capture Microdissection
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Documentation of Laser Capture Microdissection of Glomeruli
Before LCM After LCM
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Image AnalysisQuantification of hepatic lipid on liver sections
• Select 5 random fields (5x magnification) from each specimen, using whole slide image
• Detect lipid droplets with MetaMorph® software, using color, size, and shape discriminators to detect lipid droplets as white, round objects. Report total detected area.
• Measure total liver area.
• Calculate “Area fraction lipid” using a spreadsheet.
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Feature extraction-lipid Tissue area threshold
Original Image Thresholded
Lipid Area Measurement
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Dose(mg/kg/day) Animal #
Area fraction
0 1001 0.0101003 0.0051005 0.007
50 2001 0.0182003 0.0212005 0.012
100 3001 0.0453003 0.0253005 0.015
200 4001 0.0974003 0.085
0.000
0.020
0.040
0.060
0.080
0.100
0.120
1001 1003 1005 2001 2003 2005 3001 3003 3005 4001 4003 4005
Are
a F
rac
tio
n "
Lip
id"
Hepatocyte Lipid Quantification
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0 50 100 200
Dose(mg/kg/day)
Lip
id A
rea
Fra
ctio
n
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Next Step
• Apply pattern recognition software to identify and measure areas of vacuolated hepatocytes on whole slide images
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Quantitation of percent human hepatocytes in sections of chimeric liver
Human hepatocytes
Mouse hepatocytes
Anti-human mitochondria antibody used to identify human hepatocytes in chimeric mouse liver [PXB-mouse, PhoenixBio]
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Morphometric Thresholding on Whole SlidesControl Treated
Blue = Mouse originYellow = Human origin
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Liver Chimerism by Morphometry
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Left Median Lobe Right Median Lobe Left Lateral Lobe
Are
a F
ract
ion
Po
siti
ve P
ixel
s (a
nti
-hu
man
mit
och
on
dri
a)
Control
Treated
Treatment caused an unexpected reduction in percentage of human hepatocytes in chimeric liver
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Summary
• Applications of digital pathology and whole slide imaging presented:
– Ultrastructural pathology
• Correlation of light microscopy and electron microscopy observations
• Use of TEM and LCM for biomarker validation
– Image analysis
• Hepatic lipid quantitation
• Quantitation of human hepatocyte fraction in whole-slide images of chimeric livers
Bridging the DividePathology Visions 2009 Jerry Gagne
© 2009 Abbott
Acknowledgements
• Cellular Molecular and Experimental Toxicology
– Yi Yang
– Wayne Buck
– Andrew Lisowski
– Rita Ciurlionis
– Eric Blomme
• Pathology
– Carmen Nasarre
– George Foley
• Abbott Antiviral Research
– Tami Pilot-Matias
– Christine Collins
– Susan Lacy
– Teresa Ng
• Investigative Toxicology
– David Cugier