Gas6 Anti-apoptotic Signaling Requires NF-κB Activation*

By F. Demarchi, R. Verardo, B. Varnum, C. Brancolini, C. Schneider. Journal of Biological Chemistry, 2001

98 citations recorded by the source corpus.

The growth arrest-specific 6 gene product Gas6 is a growth and survival factor related to protein S. Gas6 is the ligand of Axl receptor tyrosine kinase; upon binding to its receptor Gas6 activates the phosphatidylinositol 3-OH kinase (PI3K) and its downstream targets S6K and Akt. Gas6 anti-apoptotic signaling was previously shown to require functional PI3K and Akt and to involve Bad phosphorylation in serum-starved NIH 3T3 cells. Here we demonstrate that Gas6 induces a rapid and transient increase in nuclear NF-κB binding activity coupled to transcription activation from NF-κB-responsive promoters and increase in Bcl-xL protein level. Gas6 survival function is impaired in cells lacking p65/RelA and in NIH 3T3 cells transfected with a dominant negative IκB, indicating that NF-κB activation plays a central role in promoting survival in this system. Moreover, NF-κB activation can be blocked by a dominant negative Akt and by wortmannin, an inhibitor of PI3K, thus suggesting that NF-κB activation is a downstream event with respect to PI3K and Akt, as already described for other growth factors. In addition, we show that glycogen synthase kinase 3, which is phosphorylated in response to Gas6, can physically associate with NFKB1/p105 in living cells and can phosphorylate it in vitro. Furthermore, Gas6 treatment is coupled to a decrease in p105 protein level. Altogether these data suggest the involvement of NF-κB and glycogen synthase kinase 3 in Gas6 anti-apoptotic signaling and unveil a possible link between these survival pathways.

Subfields: Cellular and Molecular Neuroscience, Immunology, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/92378296d9fe14f60dd20d843caa09a3cfb99e5e

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Citations in the corpus

• Toll-like receptor–mediated cytokine production is differentially regulated by glycogen synthase kinase 3 (2005, background): “GSK3 can both positively and negatively affect a variety of transcription factors that are critical in regulating pro- and anti-inflammatory cytokine productio”
• TAM receptor tyrosine kinases: biologic functions, signaling, and potential therapeutic targeting in human cancer. (2008, background): “Transcriptional activation of Bcl‐xL occurs via the cannonical NF B activation pathway whereby Akt phosphorylates and activates IKK, leading to phosphorylation and degradation of I B releasing NF B from the inhibitory complex (Demarchi et al., 2001).”