Fas-induced proteolytic activation and intracellular redistribution of the stress-signaling kinase MEKK1

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Fas-induced proteolytic activation and intracellular redistribution of the stress-signaling kinase MEKK1.

The stress-activated protein kinase (SAPK, alternatively JNK) is activated rapidly by cell stress stimuli such as inflammatory cytokines and oxidative stress, and more slowly by the initiation of the apoptotic cell death response by events such as ligation of the Fas protein. Mitogen-activated protein kinase/Erk kinase kinase-1 (MEKK1) is an activator of SAPK, serving as a SAPK-kinase-kinase th...

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Intracellular Aggregation of Polypeptides with Expanded Polyglutamine Domain Is Stimulated by Stress-Activated Kinase Mekk1

Abnormal proteins, which escape chaperone-mediated refolding or proteasome-dependent degradation, aggregate and form inclusion bodies (IBs). In several neurodegenerative diseases, such IBs can be formed by proteins with expanded polyglutamine (polyQ) domains (e.g., huntingtin). This work studies the regulation of intracellular IB formation using an NH(2)-terminal fragment of huntingtin with exp...

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Interleukin-6 inhibits Fas-induced apoptosis and stress-activated protein kinase activation in multiple myeloma cells.

Fas belongs to the family of type-1 membrane proteins that transduce apoptotic signals. In the present studies, we characterized signaling during Fas-induced apoptosis in RPMI-8226 and IM-9 multiple myeloma (MM) derived cell lines as well as patient plasma cell leukemia cells. Treatment with anti-Fas (7C11) monoclonal antibody (MoAb) induced apoptosis, evidenced by internucleosomal DNA fragment...

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Activation of the IκBα Kinase Complex by MEKK1, a Kinase of the JNK Pathway

kinases that they directly activate, such as PAK (Bag-rodia et al. then activated by these proteins by a mechanism yet to be determined. MEKK1 then activates MKK4, which in While the signal transduction cascade leading to the activation of JNK is relatively well defined, the steps leading to the phosphorylation of I␬B␣ are poorly understood. Many of the stimuli that induce NF-␬B, such as Summar...

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Mitogen‐Activated Protein Kinase and Intracellular Polyamine Signaling Is Involved in TRPV1 Activation–Induced Cardiac Hypertrophy

BACKGROUND The transient receptor potential vanilloid type 1 (TRPV1) is expressed in the cardiovascular system, and increased TRPV1 expression has been associated with cardiac hypertrophy. Nevertheless, the role of TRPV1 in the pathogenesis of cardiac hypertrophy and the underlying molecular mechanisms remain unclear. METHODS AND RESULTS In cultured cardiomyocytes, activation of TRPV1 increas...

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ژورنال

عنوان ژورنال: Proceedings of the National Academy of Sciences

سال: 1998

ISSN: 0027-8424,1091-6490

DOI: 10.1073/pnas.95.10.5595