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2 protocols using cyp2b6

1

Cytochrome P450 Activity Assays

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Bovine serum albumin (BSA), NADPH, 1-chloro-2,4-dinitrobenzene (CNDB), glutathione, o-phenylenediamine dihydrochloride (OPD), ethoxyresorufin, methoxyresorufin, benzyloxyresorufin and pentoxyresorufin, were purchased from Sigma-Aldrich Chemical Co. (St. Louis, MO). Microtiter plates (MaxiSorp) were purchased from Nunc (Roskilde, Denmark). Polyclonal CYP1A1 antibody was purchased from Biosense Laboratories, (Bergen, Norway). CYP2B6, CYP2E1 and CYP2B1/2 antibodies were purchased from Santa Cruz Biotechnology (Dallas TX, USA). The CYP3A antiserum was a kind gift from Dr. Malin Celander. All other chemicals were of the highest commercially available grade.
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2

Protein Extraction and Immunoblotting Protocol

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Protein extracts were prepared as previously described.5 (link),6 (link) Nuclear extracts (50 μg) were loaded on 4%–20% gradient gels (Bio-Rad, Hercules, CA) and transferred to nitrocellulose membranes (Bio-Rad). For the investigations of PP2Ac, cytoplasmic nuclear and whole-cell extracts were used. Because C/EBPα is detected mainly in nuclei, Co-IP was performed with nuclear extracts using an improved Trueblot (Rockland Immunochemical, Limerick, PA) protocol as described.5 (link) Antibodies used for Western blot and Co-IP were as follows: PP2Ac (clone7A6; Millipore Sigma, Burlington, MA), PPP2R5A (ab89621; Abcam, Cambridge, MA), PARP1 (Santa Cruz), cyclin D1 (sc-753; Santa Cruz), Gank (12985S; Cell Signaling Technologies, Danvers, MA), cdc2 (sc-954; Santa Cruz), CY3PA4 (sc-30621; Santa Cruz), CYP2B6 (sc-55924; Santa Cruz), CYP7A1 (E-10; Santa Cruz), PEPCK (F-3; Santa Cruz), HDAC1 (05-100-I; EMD Millipore), C/EBPα (sc-61; Santa Cruz), p21 (sc-6246; Santa Cruz), HNF4α (PP-K9218-00; Perseus Proteomics), Sp5 (ab36593; Abcam), and β-actin (A5316; Sigma). Antibodies to ph-S190-C/EBPα have been described in our previous article.5 (link) Western blot and Co-IP experiments were performed 3 times which each biological replicate.
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