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2 protocols using histamine

1

Boehmeria nivea Extract Inhibits Mast Cell Activation

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Anti-DNP IgE, DNP-bovine serum albumin (BSA), dexamethasone, and Evans blue were purchased from Sigma (St. Louis, MO, USA). The RBL-2H3 cell line (KCLB-22256) was purchased from the Korean Cell Line Bank (Seoul, Korea). Dulbecco’s modified Eagle’s medium (DMEM), fetal bovine serum, and penicillin-streptomycin (PS) were purchased from Hyclone (Logan, UT, USA). The histamine, TNF-α, IL-6, IL-1β, and IL-4 ELISA kits were purchased from Biovision (Milpitas, CA, USA). Anti-phospho-p38 (Thr180/Tyr182), anti-phospho-ERK (L352), anti-phospho-JNK (T183/Y185), anti-p38, anti-ERK, anti-JNK, and β-actin were purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA). Boehmeria nivea is an eco-friendly pesticide-free product, which was purchased from a farming association (Yeonggwang, Korea).
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2

Immunological Markers in CO2-Asphyxiated Mice

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Blood samples were collected from the hearts of CO2-asphyxiated mice and were centrifuged (10,000g, 10 min) to obtain serum. The total protein was isolated from 100 mg of dorsal skin tissue by homogenization in 1 mL of a tissue protein extraction reagent (Pierce, Rockford, IL, USA) with protease inhibitors (Roche, Indianapolis, IN, USA) and was quantified by a bicinchoninic acid (BCA) protein assay kit (Thermo Fisher Scientific, Waltham, MA, USA). The levels of total immunoglobulin E (IgE) (BD Pharmingen, San Diego, CA, USA), histamine (BioVision, Milpitas, CA, USA), interleukin (IL)-6, IL-17A (eBioscience, San Diego, CA, USA), IL-4, interferon-γ (IFN-γ) (BioLegend, San Diego, CA, USA), and thymic stromal lymphopoietin (TSLP; Abcam, Cambridge, MA, USA) were analyzed by sandwich ELISA (enzyme-linked immunosorbent assay) according to the manufacturer’s instructions.
The spleens were weighed. The splenic weight index was defined as the spleen weight divided by the whole body weight.
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