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4 protocols using total sapk jnk

1

Immunoblotting Analysis of Cell Signaling Pathways

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Antibodies to NF-κB p65 (no. 8242S), beta-tubulin (no. 2128S), GAPDH (no. 5174S), phospho-MAPK p38 (T180+Y182; no. 4511S), total MAPK p38 (no. 8690S), and total SAPK/JNK (no. 9252T) were obtained from Cell Signaling Technology. Antibodies to phospho-JNK (T183+Y185; no. 6254), phospho-FOS (S374; no. 81485), total c-FOS (no. 166940), phospho-JUN (S63; no. 822), and total c-JUN (no. 74543) were obtained from Santa Cruz Biotechnology. Goat anti-rabbit and anti-mouse IgG-horseradish peroxidase (HRP) secondary antibodies (no. 31460 and no. 31430) were obtained from Thermo Fisher Scientific. DAPI nuclear stain was obtained from Cell Signaling, and goat anti-rabbit IgG AlexaFluor488 was obtained from Molecular Probes (Life Technologies).
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2

AMPK Signaling Pathway Regulation

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Cell culture medium and supplements were purchased from GIBCO-BRL (Rockville, MD, USA). Phloretin, the AMPK inhibitor ara-A, the MEK inhibitor PD98059, the JNK inhibitor SP600125, the p38 inhibitor SB203580, and the anti-β actin antibody were purchased from Sigma–Aldrich (St. Louis, MO, USA). Antibodies against phospho-AMPKα (Thr172), total AMPKα, phospho-ERK1/2, total-ERK1/2, phospho-SAPK/JNK, total-SAPK/JNK, phospho-p38α MAPK, and total-p38α MAPK were purchased from Cell Signaling Technology (Beverly, MA, USA).
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3

Western Blot Analysis of Cell Signaling

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Cells were incubated in cell lysis buffer (no. 9803; Cell Signaling Technology, Danvers, MA) followed by centrifugation at 13,000 rpm for 10 minutes. Supernatants were collected, and protein concentrations were determined using the Bradford Assay (Bio-Rad, Hercules, CA). Protein lysates were electrophoresed on Tris-glycine SDS polyacrylamide gels and transferred onto Immobilon-P membrane. Incubation with antibodies was performed according to Cell Signaling Technology-recommended procedures and proteins were visualized using ECL (Pierce). p16Ink4A, p19ARF, p21, Total-p53, cdc2 were from Abcam. Phospho-p53(Ser15), Cyclin B1, Phospho-SAPK/JNK(Thr183/Tyr185), Total-SAPK/JNK and β-Actin were from Cell Signaling Technology.
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4

Western Blot Analysis of Stress Kinases

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After RIPA buffer lysis (Cell Signaling, Leiden, The Netherlands), protein concentration was measured with BCA Protein assay (Thermo Fisher Scientific). 30 μg protein extracts were resolved by 10% SDS PAGE, transferred to nitrocellulose membranes and probed with antibodies against: phospho-stress-activated protein kinase/c-Jun NH(2)-terminal kinase (SAPK/JNK) (Thr183/Tyr185, clone G9 MAB #9255), total SAPK/JNK (#9252), phospho-p38 Mitogen-Activated Protein Kinase (MAPK) (Thr180/Tyr182, clone 28B10 MAB #9216), total p38 MAPK (#9212) (all from Cell Signaling), p75NTR (clone 8211 MAB5264) (EMD Millipore), GAPDH (clone G9, MAB #32233) (Santa Cruz Biotechnology), and tubulin (Sigma Aldrich). Blots were developed by ECL system (Amersham Biosciences) according to the manufacturer’s protocol.
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