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3 protocols using irβ sc 711

1

Insulin Signaling Pathway Protein Analysis

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Tissue fragments and cells were homogenized in RIPA buffer (EMD
Millipore) supplemented with protease and phosphatase inhibitors (Biotool).
Lysates were separated from insoluble material by centrifugation (12,000
RPM, 15 min, 4°C) and total protein content was determined by BCA
assay (ThermoFisher). Equal protein ammounts (~10 μg) were
resolved by SDS-PAGE and transferred to polyvinylidene fluoride (PVDF)
membranes (EMD Millipore). Membranes were immunoblotted with the indicated
antibodies: p-IR/IGF1R (#3024, Cell Signaling), IRβ (sc-711, Santa
Cruz), IGF1Rβ (#3027, Cell Signaling), p-IRS1 (09–432,
Millipore), IRS1 (611394, BD), p-AktS473 (#9271, Cel Signaling),
Akt pan (#4685, Cell Signaling), p-FoxO1/3 (#9464, Cell
Signaling), FoxO1 (#9454, Cell Signaling), p-ERK1/2 (#9101, Cell
Signaling), ERK1/2 (#9102, Cell Signaling), CPT1A (ab128568,
Abcam), HADHA (ab54477, Abcam), SREBP1 (sc-8984, Santa Cruz), Fatty Acid
Synthase (ab22759, Abcam), Vinculin (#3574, Chemicon).
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2

Immunoblotting Analysis of Insulin Signaling

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Frozen liver and epididymal WAT lysates were prepared in RIPA buffer, as described previously (Delibegovic et al., 2007 (link)). Proteins were separated by 4–12% SDS-PAGE and transferred to nitrocellulose membranes. Immunoblots were performed using antibodies from Cell Signaling Technology (Cell Signaling by NEB, Hitchin, UK) (unless stated otherwise) against phospho-S6 (s235/236) 4858S; total S6 2217S; phospho-Akt/PKB (s473) 9271S; phospho-eIF2α (s51) 9721S; total eIF2α 5324S; total IRE1α 3294S; phospho-IRE1α (s724) PA1-16927 (Thermo Scientific); phospho-IR (tyr1163/1163) 44804G (Invitrogen, Paisley, UK); phospho-IR (tyr1158) 44802G (Invitrogen); IR-β sc-711 (Santa Cruz, Dallas, TX, USA); total Akt/PKB A2210 (Santa Cruz); and extracellular signal-regulated kinase 2 (ERK2) I2908 (Santa Cruz). Proteins were visualized with enhanced chemiluminescence and quantified using Bio-1D software (Peqlab, Sarisbury Green, UK).
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3

Molecular Signaling Pathway Analysis

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Cholesterol and triglyceride (TG) concentrations were determined using kits purchased from Wiener Lab Group (Rosario, Argentina). Free fatty acids (FFA) and insulin levels were determined using kits from Coat-A-Count (Siemens, CA). Antibodies for α-tubulin (sc-23948), and the insulin receptor (IR)β (sc-711) were from Santa Cruz Biotechnology (Santa Cruz, CA). Primary antibodies for extracellular signal-regulated kinases 1/2 (ERK1/2) (#4695), p-ERK (Thr202/Tyr204) (#4370), JNK (#9252), p-JNK (Thr183/Tyr185) (#9251), p-PKCδ (Thr505) (#9374), IKKα (#2682), p-IKKα/β (#2697) (Ser176/180), protein kinase B (AKT) (#4691), p-AKT (Ser473) (#4060), were obtained from Cell Signaling Technology (Danvers, MA). Antibody for p-IR (Tyr1162/Tyr1163) (448046G) was obtained from Invitrogen (Waltham, MA). Antibodies for insulin receptor substrate 1 (IRS1) (06–248), p-IRS1 (Tyr612) (09–432) and PTP1B (ABS40), and Luminata™ HRP chemiluminescence detection reagent were from Millipore Corp. (Billerica, MA). PVDF membranes and protein standards were obtained from BIO-RAD (Hercules, CA). The ECL Western blotting system was from Thermo Fisher Scientific Inc. (Piscataway, NJ). EC and all other reagents were purchased from Sigma (St. Louis, MO).
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