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4 protocols using p0067

1

Immunoelectron Microscopy Analysis of Cellular Proteins

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IEM analysis was performed at the electron microscopy core facility on campus. Briefly, cells were fixed for 1 h, followed by washing with 0.1 M PB buffer. Samples were then dehydrated with ethanol, embedded, cut into 80 nm-thick slides by Leice EM UC6, and then mounted on formvar/carbon-coated 200 mesh gold grids. Then slides were incubated with antibodies (p62 Sigma-Aldrich 1:20, P0067; FTO abcam, ab92821, 1:20) in 1% BSA. After rehydration with PBS and blocking with 1% BSA, slides were next washed with PBS, followed by blocking with 0.5% BSA again, and then incubated with gold-conjugated secondary antibodies (10 nm for FTO or 15 nm for p62, 1:10) in 0.5% BSA. After washing, samples were stained briefly with Uranyl Acetate and Lead Citrate, air dried, and then examined under 300KV at FEI Tecnai F30.
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2

Western Blot Analysis of Autophagic Markers

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Macrophage supernatants were removed post treatment and the cells were washed twice with phosphate buffered saline (PBS). The cells were lysed in lysis buffer and primed with a protease inhibitor (Roche Applied Science, 10-519-978-001). Then, 30 ug of protein was separated by SDS-PAGE and transferred onto polyvinylidene difluoride (PVDF) membranes. Membranes were immunoblotted for LC3 (Sigma-Aldrich, L8918), p62 (Sigma-Aldrich, P0067), beclin-1 (Abcam, ab51031), actin (Abcam, ab8226-100), IFNGR1 (Abcam, ab61179), IFNGRbeta (Abcam, ab84524), and calreticulin (Stressgen, #SPA-600). Protein bands were detected with HRP-conjugated secondary antibodies visualized using enhanced chemiluminescent (ECL) reagents (Life Sciences, RPN2106).
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3

Quantitative Analysis of Autophagy Markers

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PLA assay was performed according to the manufacturer’s instructions (Sigma). Briefly, cells were first fixed with 4% paraformaldehyde/PBS and then permeabilized in 0.5%(v/v) Triton X-100. After blocking with 5% normal goat serum (Invitrogen, Carlsbad, California), cells were incubated overnight with the following primary antibodies at 4 °C in 1XPBS/1%BSA: anti-p62 (Rabbit) (Sigma-Aldrich, P0067, 1:400); anti-LC3B (rabbit) (Abcam, ab192890,1:200), and anti-FTO (mouse) (Abcam, ab92821, 1:200). In-situ PLA detection was performed using a Duolink Detection Kit (Sigma-Aldrich) with a pair of nucleotide-labeled secondary antibodies. After ligation and amplification of PLA probes, signals were examined using a fluorescence microscope (Olympus IX71).
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4

Histopathological analysis of Labrador Retriever dogs

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Autopsy was performed in 8 LR dogs (dog Nos. 1-8). Samples of the major internal organs, skin, central nervous system (CNS), and peripheral nerves were formalin fixed, paraffin embedded, and processed for routine histology. The brain and a skin biopsy were formalin fixed and examined from the ninth euthanized dog (dog No. 9). Skin biopsies from the dorsal flank area of 4 additional living LRs were formalin fixed, paraffin embedded, and processed for routine histology. Tissue sections of the formalin-fixed material were stained with hematoxylineosin (HE), periodic acid-Schiff (PAS), and PAS-diastase. Fresh-frozen tissue samples were prepared from the pancreas and skin of 2 affected (dog Nos. 2 and 3) and 1 control dog (control dog No. 1) and stained with PAS and Oil-red-O for glycoproteins and lipids, respectively. Antibodies used for immunohistochemical staining included anti-p62/sequestosome 1 as marker for autophagic cargo (Sigma-Aldrich P0067), anti-LC3A/B for autophagosomal membranes (LC3B; Abcam ab48394), and anti-LAMP2 for the integral membrane protein
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