In fact, Jodelka et al. (2010) [51] has recently identified a feedback loop in which low SMN levels exacerbate SMN2 exon 7 skipping.
The EGFR-FOXO6-SOX2 signaling pathway regulating expression of the BIM and BMF apoptotic factors thus identifies a feedback loop that may attenuate the effectiveness of anti-EGFR therapy in cancer and contribute toward the ultimate development of drug resistance.
For instance, using glioma cells with EGFR amplification, Suh et al. [ 63] identified a feedback regulatory loop consisting of two miRNAs (miR-25 and miR-32), their transcriptional factors (E2F1 and MYC) and p53.
We identify a negative feedback loop mediated by Akt as responsible for repressing Grb7.
Overall, these data demonstrate that scb is indeed a BMP target gene and identify a positive feedback loop in which BMP-dependent induction of scb expression further enhances BMP signal transduction via the activation of integrin signaling.
To identify whether there is a feedback loop in the Sirt 1-AGE regulation signaling, we investigated the regulation on Sirt 1 by AGE in endothelial cells, and it was shown that the Sirt 1, rather than Sirt 2, was significantly downregulated by the AGE-BSA in both mRNA and protein levels dose dependently.
Several key regulators of stem cell maintenance have been identified in the past, including a feedback loop between stem cells and underlying niche cells, named the organizing center [ 4]; regulation of cytokinin synthesis and response [ 5]; and localized expression of miRNAs [ 6].
Surprisingly, we identified a regulatory feedback loop of two phz gene clusters expression, which involved a small amount of PCA produced from the gene cluster phzA2-G2 that could function as a signaling molecule to induce self-expression and to activate the expression of the phzA1-G1 cluster, and could respond to adequate amounts of synthetic PCA in response to environmental cues.
Young identifies a comparable feedback loop of outrage in Trump's presidential campaign.
We have identified a positive feedback loop between tumor cells and macrophages that propagates the growth and promotes the survival of colon cancer cells: tumor cells stimulate macrophages to secrete IL-1β, which in turn, promotes Wnt signaling and stabilizes Snail in tumor cells, conferring resistance to TRAIL.
