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4 protocols using ab103790

1

Multiparametric Islet Immunophenotyping

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Immunohistochemistry of frozen or paraffin-embedded sections of pancreas, human islets, and human islet-like organoids (HILOs) was performed with antibodies to insulin (1/100, Abcam ab7842), c-peptide (1/100, Abcam ab30477), glucagon (1/100, Abcam ab10988), somatostatin (1/100, Abcam ab103790), pancreatic polypeptyde (1/100, Abcam, ab113694), NKX2–2 (1/100, DSHB, 74.5A5), NKX6–1 (1/100, DSHB, F55A12), MAFA (1/100, Abcam, ab26405), MAFB (1/100, Abcam, ab66506), PDX-1 (1/100, R&D, AF2419), CHGA (1/100, Abcam, ab15160), SYNAPTOPHYSIN (1/100, Biogenex, MU363-UC) and PD-L1 (1/100, Abcam, ab20592). For MAFA and MAFB, signal amplification was performed using TSA-Cy3 kit (Akoya Biosciences, SAT704A001EA). Secondary antibodies were coupled to Alexa 568, 647 (Life Technologies) and visualized by confocal microscopy (ZEISS) or fluorescence microscopy. Hoechst 33342 (Thermo Scientific, 62249, 1μg/ml final concentration) was used for nuclear staining.
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2

Pancreatic Cell Immunohistochemistry

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Whole 5% paraformaldehyde-fixed and paraffin-embedded samples of pancreas from Wistar and Goto-Kakizaki rats, typically of ages of 31, 52, and 79 weeks, were investigated using either monoclonal antibody mouse anti-insulin ab6995 (ABCAM, Cambridge, UK), diluted 1 : 100, or polyclonal antibodies such as rabbit anti-glucagon ab8055 (ABCAM), diluted 1 : 100, rabbit anti-somatostatin ab103790 (ABCAM), diluted 1 : 500, and rabbit anti-pancreatic polypeptide PA1-36141 (Pierce Biotechnology, Rockford, IL), diluted 1 : 1000. Secondary antibodies (Life Technologies), diluted 1 : 1000, were Alexa Fluor 568 Donkey anti-Mouse IgG, A10037 for red imaging, and Alexa Fluor 488 Donkey anti-rabbit IgG (H + L), A21206, for green imaging. Immunohistochemical samples were viewed by a motorized inverted fluorescence microscope Olympus IX-81 and Cell F software.
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3

Somatostatin Immunohistochemistry in GIN Mice

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Anesthetized GIN mice were perfused with 4% paraformaldehyde (in phosphate-buffered saline, pH 7.4). Next, the brains were post-fixed for 24 h. Brain slices (50 μm) were prepared with a cryostat (CM3050, Leica). Brain sections were blocked with 3% donkey serum and 1% bovine serum albumin in Tris-buffered saline containing 0.5% Triton X-100 for 1 h at room temperature. The brain sections were then probed with mouse anti-SST (1:200, #ab103790, Abcam, Cambridge, MA, USA) at 4 °C for 72 h and visualized using an Alexa Fluor 647-conjugated donkey anti-mouse secondary antibody (1:200, #711605152, Jackson ImmunoResearch, West Grove, PA, USA).
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4

Multiparametric Islet Immunophenotyping

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Immunohistochemistry of frozen or paraffin-embedded sections of pancreas, human islets, and human islet-like organoids (HILOs) was performed with antibodies to insulin (1/100, Abcam ab7842), c-peptide (1/100, Abcam ab30477), glucagon (1/100, Abcam ab10988), somatostatin (1/100, Abcam ab103790), pancreatic polypeptyde (1/100, Abcam, ab113694), NKX2–2 (1/100, DSHB, 74.5A5), NKX6–1 (1/100, DSHB, F55A12), MAFA (1/100, Abcam, ab26405), MAFB (1/100, Abcam, ab66506), PDX-1 (1/100, R&D, AF2419), CHGA (1/100, Abcam, ab15160), SYNAPTOPHYSIN (1/100, Biogenex, MU363-UC) and PD-L1 (1/100, Abcam, ab20592). For MAFA and MAFB, signal amplification was performed using TSA-Cy3 kit (Akoya Biosciences, SAT704A001EA). Secondary antibodies were coupled to Alexa 568, 647 (Life Technologies) and visualized by confocal microscopy (ZEISS) or fluorescence microscopy. Hoechst 33342 (Thermo Scientific, 62249, 1μg/ml final concentration) was used for nuclear staining.
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