PMC:7019868 / 15071-17051 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7019868","sourcedb":"PMC","sourceid":"7019868","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7019868","text":"2.5.2. Histopathology and Immunohistochemistry\nAt three days post-inoculation, three pigs from each virus-treated group and one pig from mock group were humanely euthanized by electrocution followed by exsanguination for histopathological and immunohistochemical assessments, as described previously [22]. Duodenum, jejunum, ileum, cecum, colon, rectum and mesenteric lymph nodes were collected, formalin-fixed, paraffin-embedded, sectioned at 4 μm, and stained routinely with hematoxylin and eosin (H\u0026E) for morphometric analysis by assessing the ratio of villi height to crypt depth blindly by one veterinary pathologist.\nImmunohistochemistry was performed to evaluate the distribution of PEDV antigen. Briefly, formalin-fixed paraffin-embedded tissues were sectioned at 4 μm, deparaffined in xylene, rehydrated in serially diluted ethanol, and proceeded to epitope retrieval with the Trilogy antigen retrieval system (Cell Marque, Rocklin, CA, USA). After being washed three times with Tris-buffered saline plus 0.1% Tween 20 (TBST), tissue slides were treated with 3% hydrogen peroxidase (KYB, New Taipei City, Taiwan) and 10% normal goat serum (Dako, Carpinteria, CA, USA) to block the endogenous peroxidase activity and non-specific signals, respectively. For antigen detection, an in-house anti-PEDV N antibody, DE-1, at a dilution of 1:1000 in 10% normal goat serum was applied to the slides for 1 h at RT followed by three times wash with TBST. The first antibodies were then captured using the polyclonal anti-rabbit/mouse immunoglobulin, EnVision-DAB+ system (Agilent Technologies, Santa Clara, CA, USA) at RT for 1 h and color was developed afterward with 3, 3′-diaminobenzidine (DAB) chromogen (Agilent Technologies, Santa Clara, CA, USA). The slides were counterstained with hematoxylin (MUTO, Tokyo, Japan), mounted in Entellan (Merck, Darmstadt, Germany) and cover slipped. Positive signals were visualized under an inverted light microscope (Nikon, Tokyo, 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