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3 protocols using ab2415

1

Antibody Panel for Cerebrovascular Characterization

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Primary antibodies: Rat monoclonal anti-Pecam-1/CD31 (Clone MEC 13.3, BD Pharmingen, San Jose, CA, USA); rabbit polyclonal anti-STAT1 (ab2415, Abcam, Cambridge, UK); mouse monoclonal anti-STAT1 pY701 (ab29045, Abcam, Cambridge, UK); rabbit polyclonal anti-NFκB/p65 (PA1–186, Thermo Fisher, Waltham, MA, USA); rabbit polyclonal anti-NFκB/p65 pThr435 (PA5–37724, ThermoFisher, Waltham, MA, USA); mouse monoclonal Anti-γ Interferon (ab133566, Abcam, Cambridge, UK).
Secondary antibodies: Alexa594-conjugated goat anti-rat antibodies (Pecam-1 immunolabeling on brain slices), Horseradish peroxidase (HRP)-conjugated goat anti-mouse and anti-rabbit (Western-blot).
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2

Evaluating STAT1 Expression in High-Grade Serous Ovarian Cancer

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Tumour STAT1 expression was evaluated using immunohistochemistry (IHC) on an HGSC tissue microarray (TMA) (TFRI‐COEUR) consisting of 0.6 mm diameter FFPE tumour cores, in duplicate, from a cohort of 734 chemotherapy naïve HGSC cases. This large multicentre TFRI‐COEUR cohort contained 550 chemotherapy naïve HGSC cases that formed our STAT1 second independent validation cohort in addition to duplicates for the 184 cases (designated as CHUM cohort; first independent validation 7) from our previous study. The rabbit anti‐human polyclonal STAT1 primary antibody (1:2000 dilution, Abcam #ab2415) 7 and mouse anti‐human monoclonal CD8 primary antibody (1:25 dilution, Abcam # ab17147) were applied on separate TMA slides using the Ventana automated immunostaining system. In brief, antigen retrieval was carried out with Cell Conditioning 1 (Ventana Medical System Inc.) for 60 min. The slides were incubated with primary STAT1 or CD8 antibody with appropriate negative controls, at 37°C for 60 min. Reactions were carried out using the ultraView DAB detection kit (Ventana Medical System Inc.). Slides were counterstained with haematoxylin and bluing reagent (Ventana Medical System Inc.) for 4 min. The IHC stained TMAs were scanned on Aperio Scanscope and digitally conserved.
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3

Immunofluorescence Analysis of JAK-STAT Pathway

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COV434 cell slides were prepared and probed with antibodies specific for JAK1 (ab47435, Abcam), pJAK1 (ab138005, Abcam), STAT1 (ab2415, Abcam) and STAT3 (79D7, Cell Signalling Technologies). Primary antibodies were visualised using either a goat-anti-rabbit Alexa 555 secondary antibody (ab150078, Life Technologies) or a goat-anti-mouse Alexa 555 secondary antibody (a21422, Life Technologies) at a 1:100 dilution and 4′-6-Diamidino-2-phenylindole (DAPI) was used as a nuclear counterstain. Slides were imaged using the Axio Imager A1 fluorescent microscope (Carl Zeiss MicroImaging, Inc, Thornwood, NY) and Olympus DP70 microscope camera (Olympus America, Center Valley, PA).
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