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9 protocols using human tgf beta 1 elisa kit

1

Quantifying TGF-β1 and IFN-γ in Humanized Mice

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Total TGF-β1 level in the plasma from humanized mice was quantified by TGF beta 1 Human ELISA Kit (Abcam) according to manufacturer’s instructions.
Tumor-infiltrating T cells in humanized mice were isolated using EasySep Human T Cell Isolation kit (Stemcell Technologies). Purified T cells (5 × 105 cells/mL) were seeded into a 96-well plate and stimulated with T Cell TransAct (Miltenyi Biotec) for 24 h. After incubation, supernatant was collected and centrifuged once to remove cell debris. Human IFN-γ level in the cell-free supernatant was determined by LEGEND MAX Human IFN-γ ELISA Kit (BioLegend).
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2

TGFβ-1 Quantification by ELISA

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TGFβ−1 levels were measured by enzyme-linked immunoassay using the TGF beta 1 Human ELISA Kit (ab100647, Abcam). Levels were measured in 100 μl of cell culture media, in duplicate, according to the manufacturer’s instructions. Four representative individuals from each species were assayed on one 96-well plate. TGFβ−1 levels were quantified relative to a standard curve using 4- and 5-parameter logistic models implemented in the drc package in R. Final TGFβ−1 release is reported as four measurements: A (A-A), B (B-A), C (C-B) and D (D-B).
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3

Measuring Shh, TGFβ1, and Hydroxyproline

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The concentration of human Shh and TGFβ1 in AECII supernatant was measured by a commercially available ELISA kit: human Sonic Hedgehog ELISA kit (Abcam, ab100639) and human TGF beta 1 ELISA kit (Abcam, ab100647) according to the manufacturer’s instructions. The concentration of hydroxyproline was measured using Hydroxyproline Assay Kit (Colorimetric) (Abcam, ab222941) according to the manufacturer’s protocol.
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4

Multiplex Immunoassay for Fibroblast Secretome

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Multiplex immunoassays (LXSAHM-03, R&D Systems, Mineapolis, MN, USA) were used to investigate fibroblast expression levels of interleukin-6 (IL-6), interleukin-1 receptor antagonist (IL-1RA), and platelet-derived growth factor alpha (PDGF-α) in cell lysates following the manufacturer’s instructions. The Luminex MAGPIX system with xPONENT 4.3 software (Luminex Corporation, Austin, TX, USA. A DiaSorin Company) instrument was used for analyses of the multiplex immunoassays (using Belysa ® Immunoassay Curve Fitting Software (Merck KGaA, Darmstadt, Germany)). The ELISA assay (Human TGF beta 1 Elisa kit, ab108912, Abcam, Cambridge, UK) was further used for determining levels of transforming growth factor beta 1 (TGF-β1). Absorbance at 450 nm was measured using a 96 Plate Reader (Enzo Life Sciences, Inc., East Farmingdale, NY, USA) and additional background subtraction was done at 570 nm (analysis with Byonoy Software, Byonoy GmbH). Total protein quantification was done with a bicinchoninic acid assay (Sigma Aldrich, Merck KGaA, Darmstadt, Germany) and these data were used for normalization of the data.
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5

Treg-specific Cytokine Quantification

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The Quantikine HS ELISA Human IL10 (RnD Systems, cat. HS100C), Human TGF beta 1 ELISA kit (Abcam, cat. ab100647) and Human Interleukin 35 (IL35) ELISA Kit (Nordic BioSite, cat. EKX-6FHVKH-96) were used to measure the amount of Treg-specific cytokines in Treg suppression assay supernatant, according to instructions from the manufacturers. For IL35, samples were diluted 1:1 in sample dilution buffer, for IL10 and TGF- β , samples were handled according to manufacturer’s protocols. Absorbance was read at A450 nm (IL35 and TGF- β ), and A490 nm (IL10) using the SpectraMax plus 384 Microplate Spectrophotometer and SoftMax Pro 7.1 software (Molecular Devices).
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6

Fibroblast Cytokine and Growth Factor Expression

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Fibroblast expression of pro-inflammatory cytokines and growth factors and were quantified in lysates (see “Extracellular matrix protein expression” for a description of how lysates were collected) with Multiplex immunoassay (Interleukin-6 (IL-6), Interleukin-1 receptor agonist (IL-1RA), Luminex Discovery Assay, LXSAHM-03, R&D systems) and ELISA assays (transforming growth factor-beta (TGF-β1), Human TGF beta 1 ELISA kit, ab108912, Abcam) following manufactures instructions. Analyses was performed on Luminex (MAGPIX system with xPONENT 4.3 software (Luminex Corporation. A DiaSorin Company)) instrument for the Multiplex immune assay (analysis performed with Belysa® Immunoassay Curve Fitting Software (Merck, KGaA) and on the absorbance 96 Plate Reader (Enzo Life Sciences, Inc) measured at 450 nm and background subtraction at 570 nm (analysis performed with Byonoy software (Byonoy GmbH). Total protein quantification was done with bicinchoninic acid assay (Sigma-Aldrich), and these data were used for normalization of the data.
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7

Quantification of Treg-Specific Cytokines

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Treg-specific cytokines were measured in supernatant from the suppression assay at the end of culturing using Quantikine HS ELISA Human IL-10 (RnD Systems, cat. HS100C), Human TGF beta 1 ELISA Kit (Abcam, cat. AB100647), and Human Interleukin 35 (IL-35) ELISA Kit (Nordic BioSite, cat. EKX-6FHVKH-96) according to instructions from the manufacturers. Absorbance was read at A450 nm (IL-35 and TGF-β), and A490 nm (IL-10) using a SpectraMax plus 384 Microplate Spectrophotometer and the SoftMax Pro 7.1 software (Molecular Devices).
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8

Quantifying TGF-β1 and IL-6 Cytokines

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The production of TGF-β1 and IL-6 was assessed using commercial Human TGF beta 1 ELISA Kit (Abcam) and Human IL-6 ELISA Kit (Abcam), following the protocols, respectively.
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9

Quantifying Skin Extracellular Matrix Biomarkers

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Detection of circulating chondroitin sulfate and hydroxyproline was evaluated in serum using CS ELISA Kit (abx350001—Abbexa, Sugar Land, TX, USA) and hydroxyproline assay kit (MAK008—Sigma-Aldrich, Saint-Quentin-Fallavier, France), respectively. In HDFs, elastin, hyaluronan and TGF-β levels were evaluated in cell culture supernatant using Human Elastin ELISA Kit (ab239433—Abcam, Paris, France), Hyaluronan Quantikine ELISA Kit (DHYAL0—Bio-Techne, Minneapolis, MN, USA) and Human TGF beta 1 ELISA Kit (ab100647—Abcam, Paris, France), respectively, according to the manufacturer’s recommendations. Measurements were performed in quadruplicates for each sample condition of the ten volunteers.
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