• Register
X
Forgot Password

If you have forgotten your password you can enter your email here and get a temporary password sent to your email.

X

Leaving Community

Are you sure you want to leave this community? Leaving the community will revoke any permissions you have been granted in this community.

No
Yes

Inhibition of JNK by cellular stress- and tumor necrosis factor alpha-induced AKT2 through activation of the NF kappa B pathway in human epithelial Cells.

Previous studies have demonstrated that AKT1 and AKT3 are activated by heat shock and oxidative stress via both phosphatidylinositol 3-kinase-dependent and -independent pathways. However, the activation and role of AKT2 in the stress response have not been fully elucidated. In this study, we show that AKT2 in epithelial cells is activated by UV-C irradiation, heat shock, and hyperosmolarity as well as by tumor necrosis factor alpha (TNFalpha) through a phosphatidylinositol 3-kinase-dependent pathway. The activation of AKT2 inhibits UV- and TNF alpha-induced c-Jun N-terminal kinase (JNK) and p38 activities that have been shown to be required for stress- and TNF alpha-induced programmed cell death. Moreover, AKT2 interacts with and phosphorylates I kappa B kinase alpha. The phosphorylation of I kappa B kinase alpha and activation of NF kappa B mediates AKT2 inhibition of JNK but not p38. Furthermore, phosphatidylinositol 3-kinase inhibitor or dominant negative AKT2 significantly enhances UV- and TNF alpha-induced apoptosis, whereas expression of constitutively active AKT2 inhibits programmed cell death in response to UV and TNFalpha -induced apoptosis by inhibition of stress kinases and provide the first evidence that AKT inhibits stress kinase JNK through activation of the NF kappa B pathway.

Pubmed ID: 12048203

Authors

  • Yuan ZQ
  • Feldman RI
  • Sun M
  • Olashaw NE
  • Coppola D
  • Sussman GE
  • Shelley SA
  • Nicosia SV
  • Cheng JQ

Journal

The Journal of biological chemistry

Publication Data

August 16, 2002

Associated Grants

  • Agency: NCI NIH HHS, Id: CA77935
  • Agency: NCI NIH HHS, Id: CA89242

Mesh Terms

  • Apoptosis
  • Cell Line
  • Epithelial Cells
  • Heat-Shock Response
  • Humans
  • I-kappa B Kinase
  • JNK Mitogen-Activated Protein Kinases
  • Mitogen-Activated Protein Kinases
  • NF-kappa B
  • Osmolar Concentration
  • Phosphorylation
  • Precipitin Tests
  • Protein-Serine-Threonine Kinases
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-akt
  • Tumor Necrosis Factor-alpha
  • Ultraviolet Rays
  • p38 Mitogen-Activated Protein Kinases