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7 protocols using hepcidin

1

Biomarker Profiling for Metabolic Disorders

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IL-6, hepcidin, adiponectin, leptin, and fibroblast growth factor-21 (FGF-21) were analyzed using the respective ELISA kits: IL-6 (DY206-05; R&D Systems, Minneapolis, MN), hepcidin (DY8307-05; R&D Systems, Minneapolis, MN), adiponectin (DY1065-05; R&D Systems, Minneapolis, MN), leptin (DY398-05; R & D Systems, Minneapolis, MN), and e FGF21 (DF2100; R & D Systems, Minneapolis, MN), according to the manufacturer's instruction.
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2

Quantification of Iron Regulators

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Ferroportin (BlueGene Biotech) and IREB2 (Aviva) from cell lysates and hepcidin (R&D Systems) from cell culture supernatants were quantified by ELISA according to the respective detailed manufacturer’s instructions. Ferroportin and IREB2 levels were normalised to total protein in the cell lysates.
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3

Measuring Plasma Inflammatory Markers

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Plasma IL-6 (R&D Systems, Minneapolis, MN), TNF-alpha (R&D Systems, Minneapolis, MN), CRP (R&D Systems, Minneapolis, MN), norepinephrine (Abnova, Taiwan) and hepcidin (R&D Systems, Minneapolis, MN) was measured by enzyme linked immunosorbent assay. All samples were run in duplicate following the manufacturer’s protocol.
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4

Comprehensive Vitamin D and Inflammatory Biomarkers Assay

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Plasma vitamin D (25-OH) Total Human Assay was used to quantify levels of total vitamin D (25-OH) in plasma (Crystal Chem, Elk Grove Village, IL). The reference range for vitamin D (25-OH) is 25–80 ng/mL. Plasma erythropoietin (EPO)(R&D, Minneapolis, MN), interleukin-6 (IL-6)(R&D, Minneapolis, MN), tumor necrosis factor-alpha (TNF-α)(R&D, Minneapolis, MN), C-reactive protein (CRP)(R&D, Minneapolis, MN), iron (Abcam, Cambridge, MA), hepcidin (R&D, Minneapolis, MN), transferrin (Thermofisher, Waltham MA) and ferritin (Abcam, Cambridge UK) were measured by enzyme linked immunosorbent assay. The reference ranges for these assays are as follows: EPO 4.1–19.5miU/mL, IL-6 0–16.4 pg/mL, TNF-α 0–29.4 pg/mL, CRP 0–1240 ng/mL, iron 60–170 ug/dL, hepcidin 1–55 ng/mL, transferrin 170–370 ug/mL, ferritin 12–300 ng/mL. All samples were run in duplicate following the manufacturer’s protocol.
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5

Monitoring Kidney Transplant Outcomes

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All patients were regularly followed for 1 year. Clinical information was obtained from electronic medical records, including demographics, historical data, transplantation details and medications. Routine examinations, including complete blood count, Hb, creatinine, EPO, ferritin, transferrin, total iron binding capacity (TIBC), and other parameters were measured in the central laboratory of West China Hospital using standard laboratory methods. Estimated GFR (eGFR) was calculated using the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation. Fasting blood samples of KTRs were collected in the morning at week 2 and month 3 for measuring serum intact fibroblast growth factor 23 (iFGF23; Boster, Wuhan, China) and hepcidin (R&D system, USA) concentrations using enzyme-linked immunosorbent assay (ELISA) methods with available commercial kits.
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6

Blood Sampling for Substrate Oxidation

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Blood sampling occurred after a 10‐h overnight fast. Blood collections assessing Hgb and Hct for safety were conducted using venipuncture. During the substrate oxidation tests, blood was collected using an indwelling catheter kept patent using IV saline at approximately −100, −20, 0, 20, 40, 60, and 80 min for assessment of glucose isotope enrichments (6,6‐[2H2] glucose, Cambridge Isotope Laboratories, Andover, MA; cat: DLM‐349‐MPT‐PK). Blood collected at −100 and 80 min was also used to assess IL‐6 and hepcidin concentrations (R&D Systems, Inc, Minneapolis, MN; cat: D6050 and DRG International, Springfield, NJ; cat: EIA‐5782 respectively). Tubes yielding serum were allowed to clot at room temperature (RT) for at least 10 min then centrifuged at 3600 rpm for 10 min at 4°C. Blood was then stored at −80°C until analyzed.
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7

Iron Metabolism Biomarkers in Anemia

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The first blood sampling moment in all groups was on ICU admission. The second sampling moment for AI patients was on the day they developed anemia, the third sampling moment was 2 days later. Control patients were sampled on the first and third day of complying to their classification (Additional file 1: Table S1).
Samples were centrifuged at 1500 g for 15 min at room temperature and plasma was stored at − 80 °C. Measurements were done in heparin anti-coagulated plasma. Serum iron, transferrin, ferritin and haptoglobin were measured by immunoturbidimetric methods (Roche Cobas c702). Transferrin saturation was calculated by the formula serum iron/(25.2 × transferrin). Hepcidin (R&D), soluble transferrin receptor (sTfR) (Biovendor), erythroferrone (MyBioSource) and IL-6 levels (R&D) were measured by enzyme-linked immunosorbent assay kits.
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