IndraLab
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"XREF_BIBR Both sestrins can trigger the AMPK and target it to phosphorylate and activate TSC1 and TSC2 complex, thereby inhibiting the signaling of mTOR, a critical autophagy inhibitor of cells, XREF_BIBR, XREF_BIBR and so CX-5461-induced autophagy through AMPK and mTOR signaling pathway in U2-OS cells might arise from the upregulation of Sesn1/2 by p53."
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"AMPK promotes autophagy by at least the following ways : phosphorylating the tuberous sclerosis (TSC) complex proteins TSC1 and TSC2, which in turn downregulate mTOR activity and induce autophagy 59, phosphorylating FOXO3, phosphorylating ULK1, and dissociating Beclin1 and Bcl-2 by stimulating JNK1-Bcl-2 signaling XREF_BIBR - XREF_BIBR."
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"While transcripts for Tsc1 that is an upstream negative regulator of mTOR signaling [XREF_BIBR] were highly reduced in Foxo3 mutant erythroblasts (XREF_FIG), TSC1 protein was not significantly altered (XREF_FIG, quantification in the right panel) suggesting that reduction of TSC1 transcript expression was unlikely to mediate activation of mTOR in Foxo3 mutant erythroblasts."
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"Since hamartin and tuberin negatively regulate mTOR activity, which in turn phosphorylates and thereby activates important translation factors such as p70 S6 kinase 1 (S6K1) and eukaryote initiation factor 4E binding protein (eIF4E-BP), a major role of the TSC-mTOR signaling pathway has been suggested for tumorigenesis, and both genes were initially recognized as tumor suppressors [XREF_BIBR]."
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"Here we report that, unexpectedly, constitutive activation of mTOR signalling by Tsc1 deletion in the oligodendrocyte lineage results in severe myelination defects and oligodendrocyte cell death in mice, despite an initial increase of oligodendrocyte precursors during early development."
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"In the presence of growth factors such as insulin or insulin like growth factors, stimulated Akt and extracellular signal regulated protein kinases 1 and 2 (ERK1/2) can phosphorylate and disrupt the tuberous sclerosis complex 1/2 (TSC1 and TSC2), which activates mTOR inhibition and thus inhibiting autophagy [XREF_BIBR]."
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"In wild-type adult mice, the regeneration failure may be contributable to the suppression of mTOR activity and new protein synthesis in axotomized RGCs, since reactivating this pathway by conditional knockout of TSC1, which negatively regulate the mTOR pathway, leads to axon regeneration [XREF_BIBR]."
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"To ensure that lack of competitiveness was not a result of the supra-physiological activation of mTOR driven by deletion of Tsc1, we performed a similar set of experiments using mice engineered to express a constitutively active allele of the RagA (Rraga) GTPase, Rraga Q66L (referred to hereafter as Rraga GTP)."
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"Surprisingly, however, deletion of TSC1, also expected to enhance mTOR signaling in the same neuronal population, led to hyperphagia and obesity, suggesting that LKB1 may engage other signaling pathways to influence the activity of these and associated neurons in the melanocortin network."
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"Unexpectedly, however, the LeBrun-Julien et al., (2014) study and other studies on Tsc1 loss in oligodendrocytes demonstrate that hyperactive mTOR signaling driven by loss of Tsc1 results in hypomyelination, with reduced myelin protein and RNA expression, and eventual oligodendrocyte apoptosis."
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"While we observed no change in total tuberin expression, there was increased hamartin expression in both Nf1-/- TVZ NSCs and o-GSCs, and a decrease in phosphorylation mediated tuberin inactivation (Ser 939 and Thr 1462), excluding tuberin and hamartin mediated mTOR activation as the mechanism underlying the increased mTOR activity in o-GSCs (XREF_SUPPLEMENTARY)."
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"Moreover, in at least some experimental conditions, TSC1, a component of the TSC1/2 (hamartin and tuberin) complex that negatively regulates mTOR pathway, has been shown to localize to the basal body, and loss of either TSC1 or TSC2 upregulates ciliogenesis XREF_BIBR, XREF_BIBR, XREF_BIBR."
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"In conclusion, our study revealed that CXXC5-mediated TSC1 suppression activates the mTOR pathway, reduces autophagic cell death, induces PD-L1-mediated immune suppression, and results in tumor development, shedding light on the mechanism of the pathophysiological function of CXXC5."
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"Recent studies also indicate that REDD1 (RTP801), induced under hypoxic conditions in a HIF-1alpha dependent manner XREF_BIBR, plays a role in the TSC1 (hamartin)/TSC2 (tuberin)-mediated inhibition of mTOR XREF_BIBR, these indicating a reciprocal regulatory control between HIF-1alpha and mTOR."
"These findings strongly implicate the tuberin-hamartin tumor suppressor complex as an inhibitor of mtor. Here, we show that hamartin and tuberin function together to inhibit mammalian target of rapamycin (mtor)-mediated signaling to eukaryotic initiation factor 4e-binding protein 1 (4e-bp1) and ribosomal protein s6 kinase 1 (s6k1)."
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"TSC1 and TSC2 negatively regulate the activity of the mammalian target of rapamycin complex 1 (mTORC1), and deletion of Tsc1 or Tsc2 from mouse oocytes in primordial and further developed follicles has been shown to cause overactivation of the entire ovarian pool and subsequent POF in early adulthood [69,70]."
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"However, only four were observed to be differentially regulated during the first 120 hpf : rps6ka1, mapk1 and the mTORC2 complex member rictora, all of which encode molecules that promote mTOR signaling, and tsc1a, which encodes the tumor sclerosis complex protein, hamartin that inhibits mTOR signaling."