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2 protocols using hemoglobin

1

Comprehensive Metabolic Profiling in VSG

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Insulin (Crystal Chem), total GLP-1 (MesoScale Discovery), and acetaminophen (Sekisui Diagnostics) were measured during experiments shown in Fig. 3. Insufficient amount of blood was obtained from one Control VSG for Insulin, total GLP-1 and acetaminophen levels at 15 min. Postprandial plasma obtained at termination of studies (see above for details) was used to measure IGF-1 (R&D Systems), Activin-A (R&D Systems), Myostatin (GDF8) (R&D Systems), FGF21 (R&D Systems), L-amino acids (Abcam), Erythropoietin (Abcam), FGF23 (Abcam), Ferritin (Abcam), Hemoglobin (Abcam), Phosphate (Abcam), 25(OH) Vitamin D (Abcam). Iron levels in cecal contents were measured with Iron Assay Kit (Abcam). Glycogen content was measured in liver and muscle (tibialis anterior) samples with Glycogen Assay kit (Sigma-Aldrich). All sampled blood was collected via tail vein in EDTA-coated tubes. All assays were performed according to the manufacturer’s instructions.
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2

Characterization of Vascular Calcification

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Paraffin-embedded human and mouse vascular tissues were stained using Masson Goldner trichrome to detect erythrocytes (bright red), connective tissue (light green), and bone structures (green). Calcification (red signal) was assessed using Alizarin red and van Kossa staining or 5-bromo-4-chloro-3indolyl phosphate/nitro blue tetrazolium as a substrate for alkaline phosphatase. Perl iron stain was used to detect tissue iron. Immunohistochemical analysis was performed using antibodies against eNOS (Novus Biologicals), glycophorin A (CD235a; Dako), hemoglobin (Abcam), methemoglobin (LifeSpan Biosciences), osteopontin (Abcam), osterix (Abcam), smooth muscle actin (Sigma), or TER-119 (R&D Systems) and examined under an Olympus BX51 microscope using image analysis software (Image-Pro Plus; Media Cybernetics).
Immunofluorescence and confocal microscopy analyses were performed on cryo-embedded tissue sections using primary antibodies against CD235a, osteopontin, or eNOS (Santa Cruz Biotechnology) followed by fluorescence-labeled donkey anti-mouse or donkey anti-rabbit secondary antibodies (Life Technologies) and Hoechst solution (Thermo Scientific).
Sections were examined under an Andor Revolution XD spinning disc confocal Olympus IX81 microscope. Images were analyzed using ImageJ 1.50i software.
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