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  • Title: Overexpression of mitogen-activated protein kinase kinase kinase reversed cAMP inhibition of NF-kappaB in T cells.
    Author: Ho HY, Lee HH, Lai MZ.
    Journal: Eur J Immunol; 1997 Jan; 27(1):222-6. PubMed ID: 9022022.
    Abstract:
    cAMP inhibits T cell activation by acting as an antagonist for selective kinases and transcriptional factors. We have recently demonstrated that cAMP inhibited c-Jun N-terminal kinase (JNK) but left the mitogen-activated protein (MAP) kinase cascade almost unaffected in T lymphocytes. In accordance with recent reports, we also observed a selective suppression of nuclear factor NF-kappaB activation by cAMP. The possible link between the JNK cascade and NF-kappaB activation was demonstrated by the fact that the active form of MAP kinase kinase kinase (deltaMEKK), a constitutive activator of JNK, induced NF-kappaB but not AP-1, Oct, and NF-AT in T cells. In contrast, the induction of MAP kinase kinase (MEK)-MAP kinase did not stimulate NF-kappaB activity. The specific activation of NF-kappaB by a single MEKK-JNK cascade was thus unusual, given that the activation of other transcriptional elements in T cells requires at least two signal pathways. This was further confirmed by the fact that cAMP inhibition of NF-kappaB activation was reversed by overexpression of deltaMEKK.
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