Cell Signaling Technology

Product Pathways - MAPK Signaling

p38 MAPK Control Cell Extracts #9213

Description

Nonphosphorylated p38 MAPK Control Cell Extracts: Total extracts from C-6 glioma cells prepared without anisomycin treatment to serve as a negative control. Supplied in SDS Sample Buffer.Phosphorylated p38 MAPK Control Cell Extracts: Total extracts from C-6 glioma cells prepared with anisomycin treatment to serve as a positive control. Supplied in SDS Sample Buffer.

Applications

Western Blots: For controls, CST recommends using 15 µl of phosphorylated and nonphosphorylated p38 MAP Kinase Control Cell Extracts. Boil for 2 minutes prior to use.

Background

p38 MAP kinase (MAPK), also called RK (1) or CSBP (2), is the mammalian orthologue of the yeast HOG kinase that participates in a signaling cascade controlling cellular responses to cytokines and stress (1-4). Four isoforms of p38 MAPK, p38α, β, γ (also known as Erk6 or SAPK3), and δ (also known as SAPK4) have been identified. Similar to the SAPK/JNK pathway, p38 MAPK is activated by a variety of cellular stresses including osmotic shock, inflammatory cytokines, lipopolysaccharide (LPS), UV light, and growth factors (1-5). MKK3, MKK6, and SEK activate p38 MAPK by phosphorylation at Thr180 and Tyr182. Activated p38 MAPK has been shown to phosphorylate and activate MAPKAP kinase 2 (3) and to phosphorylate the transcription factors ATF-2 (5), Max (6), and MEF2 (5-8).SB203580 (4-(4-fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)-imidazole) is a selective inhibitor of p38 MAPK. This compound inhibits the activation of MAPKAPK-2 by p38 MAPK and subsequent phosphorylation of HSP27 (9). SB203580 inhibits p38 MAPK catalytic activity by binding to the ATP-binding pocket, but does not inhibit phosphorylation of p38 MAPK by upstream kinases (10).

  1. Rouse, J. et al. (1994) Cell 78, 1027-1037.
  2. Han, J. et al. (1994) Science 265, 808-811.
  3. Lee, J.C. et al. (1994) Nature 372, 739-746.
  4. Freshney, N.W. et al. (1994) Cell 78, 1039-1049.
  5. Raingeaud, J. et al. (1995) J. Biol. Chem. 270, 7420-7426.
  6. Zervos, A.S. et al. (1995) Proc. Natl. Acad. Sci. USA 92, 10531-10534.
  7. Zhao, M. et al. (1999) Mol. Cell. Biol. 19, 21-30.
  8. Yang, S.H. et al. (1999) Mol. Cell. Biol. 19, 4028-4038.
  9. Cuenda, A. et al. (1995) FEBS Lett 364, 229-33.
  10. Kumar, S. et al. (1999) Biochem Biophys Res Commun 263, 825-31.

Application References

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Companion Products

For Research Use Only. Not For Use In Diagnostic Procedures.

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