Download STSL – Specialized Translational Services Laboratory

Yale University, School of Medicine
Department of Pathology
310 Cedar Street, LMP101
New Haven, CT 06520
YPTS Yale Pathology Tissue Services
STSL – Specialized Translational Services Laboratory
Contact information: [email protected], [email protected]
Phone: 203-785-4899
SERVICES OFFERED:
ANTIBODY VALIDATION:
Antibody validation is a critical important step in all aspects of scientific discovery, but it is often
overlooked . The validation required is a function of the ultimate application. So, for example
optimal validation for Western Blot is different than[1-3] validation for IHC. Below is a list of
validation options:
o Level BRONZE:
Western Blot with 12 cell lines will be performed.
Specific staining of the antibody will be evaluated during titration (see below).
o Level SILVER:
Western Blot with 12 cell lines will be performed. A TMA containing the same cell lines and
40 surgical specimens will be stained, protein expression levels as assessed by quantitative
immunofluorescence will be compared to the bands detected by Western Blotting.
o Level GOLD:
Western Blot with 12 cell lines will be performed. A TMA containing the same cell lines and
40 surgical specimens will be stained, protein expression levels as assessed by quantitative
immunofluorescence will be compared to the bands detected by Western Blotting.
shRNA knockdown of the suggested protein will be performed and quantified with IF.
ANTIBODY TITRATION:
Antibody titration is a necessary and critical step to evaluate specificity and sensitivity of an antibody.
It can be performed using conventional DAB based IHC methods or quantitative immunofluorescence
(QIF). QIF based antibody titration allows us to generate an expression range graph facilitating
objective evaluation of the best signal to noise ratio and optimal dynamic range at different antibody
concentrations.
Once optimal staining conditions are established specificity and sensitivity of the antibody can be
determined as well as assay reproducibility [3].
o Level BRONZE:
Confirm client titer on a test TMA (40 spots).
o Level SILVER:
The suggested antibody will be tested with 5 different titers on test TMAs (40 spots each).
o Level GOLD:
The suggested antibody will be tested with 8 different titers on test TMAs (40 spots each).
Reproducibility will be assessed for the 2 most promising titers.
QUALITATIVE ASSESSMENT OF PROTEIN AND m-RNA EXPRESSION LEVELS IN
TISSUE:
o DAB based IHC staining performed on whole tissue sections (WTS): Expression of the
suggested protein(s) is assessed by a pathologist according to standardized recommendations
for the protein(s) of interest.
QUANTIFICATION OF PROTEIN EXPRESSION LEVELS IN TISSUE:
o Quantitative Immunofluorescence Analysis: Expression of the suggested protein(s) is measured
on TMAs or whole tissue sections (WTS) using quantitative immunofluorescence (quantified
by AQUA or the Vectra System) [4, 5]. Assay reproducibility is assessed with test TMAs (40
spots each), positive and negative controls are included.
o Digital Image Analysis and Quantification of DAB based IHC: Expression of the suggested
protein(s) is measured on TMAs or whole tissue sections (WTS) using semi-automated
quantification of DAB based IHC (quantified by the Aperio Technology System or the Vectra
system). Assay reproducibility is assessed with test TMAs (40 spots each), positive and
negative controls are included.
IN SITU QUANTIFICATION OF m-RNA LEVELS:
o Quantitative Immunofluorescence Analysis: Using the RNA scope assay modified for IF and
quantified by AQUA or the Vectra System, mRNA levels are measured on TMAs or WTS [6].
Ubiquitin is assessed on each spot/WTS to confirm sufficient RNA quality of the tissue. DapB
staining (a bacterial vector) is used to define threshold for positivity. Assay reproducibility is
assessed with test TMAs (40 spots each).
o DAB based assessment of mRNA: Using the RNA scope assay for DAB staining, digital image
analysis of mRNA on TMAs or WTS will be performed using the Aperio Technology System
or the Vectra System. Ubiquitin is assessed on each spot/WTS to confirm sufficient RNA
quality of the tissue. DAPB staining (a bacterial vector) is used to define threshold for
positivity. Assay reproducibility is assessed with test TMAs (40 spots each).
INDEX-ARRAY DEVELOPMENT:
o A 40 to 60 spot TMA will be constructed consisting of patient tissue and cell lines with
different expression levels of a protein in question. Western Blot of the same cell lines with
known protein concentration will be performed and allows absolute protein quantification of
patient samples and cell lines represented on the TMA.
ASSAY DEVELOPMENT:
o Preliminary data can be submitted in order to develop assays for use in research/clinical
settings. These assays will be performed using automated, standardized and tightly controlled
procedures.
CUSTOM SERVICES
o Custom services are available upon inquiry.
o These services include cohort collection upon request for analysis of WTSs (to assess
heterogeneity of a given marker and expression levels at the invasive margins of the tumor).
o Evaluation of immune checkpoint markers using a multiplexed IF based staining approach
which facilitates evaluation of different immune checkpoint panels [7, 8].
REFERENCES:
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Baker, M., Reproducibility crisis: Blame it on the antibodies. Nature, 2015. 521(7552): p. 2746.
Fitzgibbons, P.L., et al., Principles of analytic validation of immunohistochemical assays:
Guideline from the College of American Pathologists Pathology and Laboratory Quality
Center. Arch Pathol Lab Med, 2014. 138(11): p. 1432-43.
Bordeaux, J., et al., Antibody validation. Biotechniques, 2010. 48(3): p. 197-209.
Camp, R.L., G.G. Chung, and D.L. Rimm, Automated subcellular localization and
quantification of protein expression in tissue microarrays. Nat Med, 2002. 8(11): p. 1323-7.
McCabe, A., et al., Automated quantitative analysis (AQUA) of in situ protein expression,
antibody concentration, and prognosis. J Natl Cancer Inst, 2005. 97(24): p. 1808-15.
Bordeaux, J.M., et al., Quantitative in situ measurement of estrogen receptor mRNA predicts
response to tamoxifen. PLoS One, 2012. 7(5): p. e36559.
Brown, J.R., et al., Multiplexed quantitative analysis of CD3, CD8, and CD20 predicts
response to neoadjuvant chemotherapy in breast cancer. Clin Cancer Res, 2014. 20(23): p.
5995-6005.
Schalper, K.A., et al., Objective measurement and clinical significance of TILs in non-small
cell lung cancer. J Natl Cancer Inst, 2015. 107(3).