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6 protocols using ai 4001

1

Quantification of CD8+ T Cells in 4T1 Tumors

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Paraffin-embedded sections from 4T1 tumors were cut at 4 μm thickness and paraffin removed with xylene and rehydrated through graded ethanol. Endogenous peroxidase activity was blocked with 3% hydrogen peroxide in methanol for 10 min. Heat-induced antigen retrieval (HIER) was carried out for all sections in 0.001M EDTA buffer, pH = 8.00 using a vegetable steamer at 95°C for 25 min. Sections were incubated with anti mouse CD8a (eBioscience, 14–0808-82) at 1:100 dilution for 1 hour at room temperature. After primary antibody incubation, tissues were then incubated with secondary rabbit anti-rat immunoglobulin for 30 min at 1:200 dilution (Vector, AI-4001) followed by a 30 min incubation with Dakocytomation EnvisionÅ System Labelled Polymer HRP anti rabbit (Agilent, K4003). All sections were visualized with the diaminobenzidine reaction and counterstained with hematoxylin. The number of immune-positive cells were counted in five randomly chosen fields per tumor at 100-fold magnification. 4–6 mice tumors per condition were used for analysis. Results from the five areas/mouse were averaged and used in the statistical analysis.
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2

Whole-mount in situ hybridization and Blimp1 immunohistochemistry

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Whole-mount in situ hybridisation analysis was performed as before50 (link), using antisense riboprobes for Bmp264 (link), Bmp413 (link) and Gdf328 (link). For Blimp1 immunohistochemistry, E7.5 decidua were fixed overnight in 4% PFA, dehydrated in ethanol, embedded in paraffin wax and sectioned (6 μm). Dewaxed sections were subjected to antigen retrieval by boiling for 1 h in Tris/EDTA (pH 9.0) and permeabilized for 10 min in 0.1% Triton X-100 in TBS. Sections were subsequently blocked with 10% normal goat serum in TBS. Sections were incubated in rat monoclonal anti-Blimp1 (1:500 dilution, sc-130917, Santa Cruz Biotechnology) in block overnight at 4 °C and signal-amplified with rabbit anti-rat secondary antibody (AI-4001, Vector Laboratories) for 45 min at RT followed by peroxidase blocking for 20 min at RT and development with Envison System-HRP for rabbit antibodies (K4011, DAKO) and Vector Red substrate (SK-4805, Vector Laboratories). Sections were lightly counter stained with haematoxylin, coverslipped and imaged.
Haematoxylin and eosin staining was performed as previously described36 (link).
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3

Immunohistochemistry of Uterine Development

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For immunohistochemistry (IHC), virgin and pregnant (E3.5, E4.5, E5.5 and E6.5) uteri or individual decidua were fixed overnight in 4% paraformaldehyde (PFA) in PBS, dehydrated using an ethanol series, embedded in paraffin wax and sectioned (6 μm). Dewaxed sections were subjected to antigen retrieval by boiling for 1 h in Tris/EDTA (pH 9.0) and permeabilised for 10 min in 0.1% Triton X-100 (Sigma) in PBS. After blocking with 10% normal goat serum in PBS with 0.05% Tween-20 (Sigma) for 1 h at RT, sections were incubated with primary antibodies in blocking solution overnight at 4 °C. Rat monoclonal antibodies underwent signal amplification with rabbit anti-rat secondary antibody (AI-4001, Vector Laboratories) for 45 min at RT. All samples were then subjected to peroxidase blocking for 20 min at RT and developed with Envison System-HRP for rabbit antibodies (K4011, DAKO) and Vector Red substrate (SK-4805, Vector Laboratories). Sections were lightly counterstained with haematoxylin, coverslipped and imaged. Haematoxylin and eosin staining was performed as per standard protocols. Antibodies used are listed in the Supplementary Table 1.
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4

Quantification of Liver Fibrosis and Macrophages

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Formalin‐fixed and paraffin‐embedded tissue was cut in 5‐μm‐thick sections. Each macroscopic tumor lesion was microscopically analyzed by H&E staining to confirm the tumor diagnosis.
Liver fibrosis quantification on non‐tumor parenchyma (percentage of stained area in the section) was carried out on Sirius red‐stained tissue using Tissue IA software (Leica Biosystems, Dublin, Ireland) after digitalization with a SCN400 slide scanner (Leica Biosystems, Wetzlar, Germany).
Macrophages were identified by F4/80 immunostaining using a primary rat anti‐mouse F4/80 monoclonal Ab (1:200, MCA497G, Clone A3‐1; AbD Serotec, Oxford, UK), a rabbit anti‐rat immunoglobulin (1:100, AI‐4001; Vector Laboratories, Burlingame, CA, USA), and then a goat anti‐rabbit streptavidin HRP‐conjugated Ab (En Vision K4003; Dako, Glostrup, Denmark). Peroxidase activity was seen with diaminobenzidine (DAB) and slides counterstained with hematoxylin.
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5

Comprehensive Histological and Immunochemical Evaluation of Pancreatic Tissue

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Histological and immunochemical reactions were performed on formalin-fixed paraffin embedded sections. Briefly, mouse pancreata were excised (n=4–12 per treatment group), fixed overnight in 10% neutral-buffered formalin, paraffin-embedded and serially sectioned at 4 μm. Multiple sections (n=3–6) from each pancreas were cut 50–100 microns in depth from one another and were processed using a BOND-MAX automatic IHC system (Leica, Buffalo Grove, IL, USA) using heat-mediated EDTA antigen retrieval (100°C for 20 minutes). Sections were stained with anti-CD31 (DIA-310 Dianova, Hamburg, Germany, diluted 1:250) followed by rabbit anti-rat secondary (AI-4001 Vector Laboratories, Burlingame, CA, USA 1:300). Leica Bond Mixed Refine reagents (HRP and 3,3’-diaminobenzidene-based) were used for detection and slides were counterstained with hematoxylin. Isotype-matched IgG antibodies were included as negative controls.
For insulin and glucagon immunofluorescence, serial sections from each experimental group underwent immunohistochemistry with antibodies against either insulin (I2018 Sigma 1:2000), or glucagon (EP3070 Abcam 1:2000) followed by AlexaFluor 488 and AlexaFluor 546 secondary antibodies, respectively (Life Technologies 1:200). Nuclei were stained with Hoechst 33258 (Sigma 2 μg/ml).
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6

Histological Analysis of Adipose Tissue

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Subcutaneous adipose tissue depots were fixed in 4% paraformaldehyde for 24 h at room temperature. Samples were then immersed in ethanol 100% for 24 h before processing for paraffin embedding.
To determine the adipocyte tissue diameter, paraffin sections of 8 m were stained with hematoxylin and eosin. Macrophage infiltration in the adipose tissue was assessed by staining them with a MAC-2/galectin-3 antibody (CL8942AP, Cedarlane Laboratories, Burlington, ON) diluted 1:500 in blocking buffer overnight, and was detected with an anti-rat igG antibody (AI-4001, Vector Laboratories, Burlingame, CA; 10 mg/ml). Immune complexes were detected by a Dako Envision kit (Agilent Technologies, Santa Clara, CA), according to the manufacturer's instructions, and briefly counterstained with hematoxylin. Hepatic lipid content was visualized by using Oil red O staining.
All analyses were performed in a blinded manner by the investigator and quantified using ImageJ software (version 1.50a, National Institutes of Health, Bethesda, MD). At least five high-magnification fields were selected at random for each mouse. Images were obtained using a SCN400 slide scanner and Digital Image Hub software (Leica Biosystems, Wetzlar, Germany).
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