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Study found that activated PRAS40 acts not only as a regulator of TGFA (zeige TGFA Proteine)-triggered exosome secretion but also as a common regulator of distinct microenvironmental and oncogenic signal-triggered exosome secretion in both normal and tumor cell types. PRAS40 is the first regulator identified for stress-induced exosome secretion.
PRAS40 was downregulated in the DU145 cells following MYO6 (zeige MYO6 Proteine) knockdown.
Phosphorylation of S202/203 of AKT1S1 by PKM2 released AKT1S1 from raptor (zeige RPTOR Proteine) and facilitated its binding to 14-3-3 (zeige YWHAQ Proteine), resulted in hormonal- and nutrient-signals independent activation of mTORC1 signaling and led accelerated oncogenic growth and autophagy inhibition in cancer cells.
The frameshift mutation detected in the current study would result in a premature stop of amino-acid synthesis in AKT1S1 protein and hence resembles a typical loss-of-function mutation.
Supporting this idea, we identified a downstream target of the TGFb (zeige TGFB1 Proteine)-miR (zeige MLXIP Proteine)-96 signaling pathway to be AKT1S1 mRNA, whose translated protein is a negative regulator of mTOR (zeige FRAP1 Proteine) kinase.
This review discusses the role of PRAS40 and possible feedback mechanisms, and alterations in AKT (zeige AKT1 Proteine)/PRAS40/mTOR (zeige FRAP1 Proteine) signaling that have been implicated in the pathogenesis of tumor progression. [review]
Findings indicate that dual phosphorylation of PRAS40 by Akt (zeige AKT1 Proteine) and mTORC1 promotes formation of a nuclear-specific PRAS40- and RPL11 (zeige RPL11 Proteine)-containing complex distinct from mTORC1 that inhibits the RPL11 (zeige RPL11 Proteine)-HDM2-p53 (zeige TP53 Proteine) pathway.
PRAS40 as a regulator of insulin (zeige INS Proteine) sensitivity in hSkMC
PRAS40 contains a functional nuclear export signal. Furthermore, enforced nuclear accumulation of PRAS40 impairs insulin (zeige INS Proteine) action, thereby substantiating the function of this protein in the regulation of insulin (zeige INS Proteine) sensitivity.
Data suggest that PRAS40 modulates insulin (zeige INS Proteine) action in skeletal muscle; knockdown of PRAS40 inhibits insulin (zeige INS Proteine) action in cultured myotubes and is associated with up-regulation of IRS1 (insulin receptor substrate 1 (zeige IRS1 Proteine)) degradation via proteasome proteolysis.
Overexpression of PRAS40(T246A) in the Proliferative Compartment Suppresses mTORC1 Signaling, Keratinocyte Migration, and Skin Tumor Development
PRAS40 inhibits mTORC1 hyperactivation and plays a key role in protecting cells against neurotoxic prion (zeige PRNP Proteine) peptide-induced apoptosis. Thus, PRAS40 is a potential therapeutic target for prion (zeige PRNP Proteine) disease.
PRAS40 appears to reduce brain injury following ischemic stroke by converting cell signaling from Akt (zeige AKT1 Proteine) to mTOR (zeige FRAP1 Proteine)
PRAS40 treatment improves hepatic insulin (zeige INS Proteine) sensitivity and reduces systemic hyperglycaemia in obese mice.
PRAS40 phosphorylation acts as a molecular switch allowing mTORC1 activation during physiological growth, opening up unique possibilities for therapeutic regulation of the mTORC1 complex to mitigate pathologic myocardial hypertrophy by PRAS40
Naturally secreted amyloid-beta increases mammalian target of rapamycin (mTOR (zeige FRAP1 Proteine)) activity via a PRAS40-mediated mechanism.
These results suggest that a reduction in PRAS40 specifically impairs myoblast protein synthesis, cell cycle, proliferation and differentiation to myotubes.
PRAS phosphorylation and its interaction with pAkt and 14-3-3 might play an important role in neuroprotection mediated by NGF in apoptotic neuronal cell death after transient focal cerebral ischemia
overexpression of SOD1 (zeige SOD1 Proteine) may affect the PRAS pathway after transient focal cerebral ischemia by reducing the direct oxidative reaction to pPRAS after reperfusion injury
PRAS40 is an important regulator of insulin (zeige INS Proteine) sensitivity of the Akt (zeige AKT1 Proteine)-mTOR (zeige FRAP1 Proteine) pathway and a potential target for the treatment of cancers, insulin (zeige INS Proteine) resistance and hamartoma syndromes.
AKT1S1 is a proline-rich substrate of AKT (MIM 164730) that binds 14-3-3 protein (see YWHAH, MIM 113508) when phosphorylated (Kovacina et al., 2003
AKT1 substrate 1 (proline-rich)
, proline-rich AKT1 substrate 1
, 40 kDa proline-rich AKT substrate
, proline-rich AKT substrate
, PKB/Akt substrate 40