Cell Signaling Technology

Product Pathways - MAPK Signaling

p38 MAPK Antibody #9212

Applications Reactivity Sensitivity MW (kDa) Source
W IHC-P IF-IC F H M R Mk GP (C) Endogenous 43 Rabbit

Applications Key:  W=Western Blotting  IHC-P=Immunohistochemistry (Paraffin)  IF-IC=Immunofluorescence (Immunocytochemistry)  F=Flow Cytometry
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey  C=Chicken  GP=Guinea Pig
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

p38 MAP Kinase Antibody detects endogenous levels of total p38α, -β or -γ MAPK protein. This antibody does not recognize p38δ, JNK/SAPK or p44/42 MAPK.

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to the sequence of human p38 MAPK. Antibodies are purified by protein A and peptide affinity chromatography.

Western Blotting

Western Blotting

Western blot analysis of extracts from HeLa cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-), SignalSilence® p38 MAPK siRNA I #6564 (+) or SignalSilence® p38 MAPK siRNA II (+), using p38 MAPK Antibody #9212 and α-Tubulin (11H10) Rabbit mAb #2125. The p38 MAPK antibody confirms silencing of p38 MAPK expression while the α-Tubulin (11H10) Rabbit mAb is used to control for loading and specificity of p38 MAPK siRNA.

Western Blotting

Western Blotting

Western blot analysis of extracts from C6 cells, untreated or anisomycin-treated, and NIH/3T3 cells, untreated or UV-treated, using phospho-p38 MAPK (Thr180/Tyr182) Antibody #9211 (upper) or p38 MAPK Antibody (lower).

Western Blotting

Western Blotting

Western blot analysis of extracts from NIH/3T3 cells, untreated or UV-treated for the indicated times, using Phospho-p38 MAPK (Thr180/Tyr182) Antibody #9211 (upper) or p38 MAPK Antibody (lower).


IHC-P (paraffin)

IHC-P (paraffin)

Immunohistochemical analysis of paraffin-embedded human breast carcinoma, showing nuclear and cytoplasmic localization, using p38 MAPK Antibody.

Flow Cytometry

Flow Cytometry

Flow cytometric analysis of Jurkat cells, using p38 MAPK Antibody (blue) compared to a nonspecific negative control antibody (red).

IF-IC

IF-IC

Confocal immunofluorescent images of HeLa cells-/+ UV light labeled with #9212 p38 MAPK (green) exhibiting cytoplasmic localization in untreated cells (left) and nuclear localization in treated cells (right). Red = Actin filaments (phalloidin).


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

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