AKT inhibitor VIII

AKT inhibitor VIII is a cell-permeable, reversible and potent, selective inhibitor of Akt1, Akt2 and Akt3 with IC50 values of 58 nM, 210 nM and 2.12 μM, respectively.

AKT inhibitor VIII has shown to remarkably increase anti-proliferation induced by furanodiene in human breast cancer cell MCF-7. AKT inhibitor VIII could enhance the furanodiene- stimulated?Akt and p-Akt expression decreases as well as increase furanodiene-induced PARP cleavage in MCF-7 cells [1].

AKT inhibitor VIII has been revealed to inhibit?IGF-1-induced Akt phosphorylation in a concentration-dependent manner. AKT inhibitor VIII has also been demonstrated to?reduce PRAS40 phosphorylation in PC12 cells [2].

References:
[1] Zhong Z1,?Dang Y,?Yuan X,?Guo W,?Li Y,?Tan W,?Cui J,?Lu J,?Zhang Q,?Chen X,?Wang Y. Furanodiene, a natural product, inhibits breast cancer growth both in vitro and in vivo. Cell Physiol Biochem.?2012;30(3):778-90.
[2] Wang H1,?Zhang Q,?Zhang L,?Little PJ,?Xie X,?Meng Q,?Ren Y,?Zhou L,?Gao G,?Quirion R,?Zheng W. Insulin-like growth factor-1 induces the phosphorylation of PRAS40 via the PI3K/Akt signaling pathway in PC12 cells. Neurosci Lett.?2012 May 10;516(1):105-9.

Acemannan accelerates cell proliferation and skin wound healing through AKT/mTOR signaling pathway.[Pubmed:26049685]

J Dermatol Sci. 2015 Aug;79(2):101-9.

BACKGROUND: Acemannan is a bioactive polysaccharides promoting tissue repair. However, the roles of acemannan in skin wound healing and the underlying molecular mechanisms are largely unclear. OBJECTIVE: The goal of this study is to investigate the positive role of acemannan in cutaneous wound healing and its mechanism. METHODS: Mouse skin wound model and skin primary fibroblasts were used to demonstrate the positive effect of acemannan on cutaneous wound healing. The expressions of cell proliferation nuclear antigen ki-67, cyclin D1 and activity of AKT/mTOR signaling were analyzed in acemannan-treated fibroblasts and mice. Rapamycin and AKT inhibitor VIII were used to determine the key role of AKT/mTOR signaling in acemannan-promoting cutaneous wound healing. RESULTS: We found that acemannan significantly accelerated skin wound closure and cell proliferation. Acemannan promoted the expression of cyclin D1 in cultured fibroblasts, which was mediated by AKT/mTOR signal pathway leading to enhanced activity of the eukaryotic translation initiation factor-4F (eIF4F) and increased translation of cyclin D1. In contrast, pharmaceutical blockade of AKT/mTOR signaling by mTOR inhibitor rapamycin or AKT inhibitor VIII abolished acemannan-induced cyclin D1 translation and cell proliferation. In vivo studies confirmed that the activation of AKT/mTOR by acemannan played a key role in wound healing, which could be reversed by rapamycin. CONCLUSION: Acemannan promoted skin wound healing partly through activating AKT/mTOR-mediated protein translation mechanism, which may represent an alternative therapy approach for cutaneous wound.

3',4'-Dimethoxythioflavone induces endothelium-dependent vasorelaxation through activation of epidermal growth factor receptor.[Pubmed:23232926]

Naunyn Schmiedebergs Arch Pharmacol. 2013 Apr;386(4):339-50.

It is of interest to investigate whether synthetic thioflavonoids have vasorelaxant actions as natural flavonoids. We tested the hypothesis that 3',4'-dimethoxythioflavone induces endothelium-dependent vasorelaxation through activation of epidermal growth factor (EGF) receptor. Rat aortic rings were mounted in organ baths and subjected to relaxation upon contraction. 3',4'-Dimethoxythioflavone induced endothelium-dependent vasorelaxation, which was attenuated by pretreatment with either L-N (omega)-nitroarginine methyl ester, an inhibitor of nitric oxide synthase, or 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one, an inhibitor of soluble guanylate cyclase. 3',4'-Dimethoxythioflavone-induced vasorelaxation was not affected by pretreatment with a general estrogen receptor antagonist ICI 182,780, a selective estrogen receptor-alpha antagonist methyl-piperidino-pyrazole dihydrochloride, or a G protein-coupled receptor 30 antagonist G15. However, pretreatment with EGF receptor blockers AG1478 or DAPH, but not with a phosphatidylinositol-3 kinase inhibitor LY294002 or an Akt1/2 kinase inhibitor AKT inhibitor VIII, attenuated 3',4'-dimethoxythioflavone-induced vasorelaxation. In addition, pretreatment with a Src inhibitor PP2 or an ERK inhibitor U0126 also attenuated vascular relaxation induced by the cumulative addition of 3',4'-dimethoxythioflavone. However, neither a mitochondrial electron transport inhibitor rotenone, an NADPH oxidase inhibitor apocynin, nor a superoxide dismutase mimetic MnTMPyP affected the vascular relaxation induced by the cumulative addition of 3',4'-dimethoxythioflavone. In conclusion, 3',4'-dimethoxythioflavone induces endothelium-dependent vasorelaxation through activation of EGF receptor and Src/ERK pathway in rat aorta.

Identification and characterization of pleckstrin-homology-domain-dependent and isoenzyme-specific Akt inhibitors.[Pubmed:15456405]

Biochem J. 2005 Jan 15;385(Pt 2):399-408.

We developed a high-throughput HTRF (homogeneous time-resolved fluorescence) assay for Akt kinase activity and screened approx. 270000 compounds for their ability to inhibit the three isoforms of Akt. Two Akt inhibitors were identified that exhibited isoenzyme specificity. The first compound (Akt-I-1) inhibited only Akt1 (IC50 4.6 microM) while the second compound (Akt-I-1,2) inhibited both Akt1 and Akt2 with IC50 values of 2.7 and 21 microM respectively. Neither compound inhibited Akt3 nor mutants lacking the PH (pleckstrin homology) domain at concentrations up to 250 microM. These compounds were reversible inhibitors, and exhibited a linear mixed-type inhibition against ATP and peptide substrate. In addition to inhibiting kinase activity of individual Akt isoforms, both inhibitors blocked the phosphorylation and activation of the corresponding Akt isoforms by PDK1 (phosphoinositide-dependent kinase 1). A model is proposed in which these inhibitors bind to a site formed only in the presence of the PH domain. Binding of the inhibitor is postulated to promote the formation of an inactive conformation. In support of this model, antibodies to the Akt PH domain or hinge region blocked the inhibition of Akt by Akt-I-1 and Akt-I-1,2. These inhibitors were found to be cell-active and to block phosphorylation of Akt at Thr308 and Ser473, reduce the levels of active Akt in cells, block the phosphorylation of known Akt substrates and promote TRAIL (tumour-necrosis-factor-related apoptosis-inducing ligand)-induced apoptosis in LNCap prostate cancer cells.

Tumor cell sensitization to apoptotic stimuli by selective inhibition of specific Akt/PKB family members.[Pubmed:15713898]

Mol Cancer Ther. 2005 Feb;4(2):271-9.

Recent studies indicate that dysregulation of the Akt/PKB family of serine/threonine kinases is a prominent feature of many human cancers. The Akt/PKB family is composed of three members termed Akt1/PKBalpha, Akt2/PKBbeta, and Akt3/PKBgamma. It is currently not known to what extent there is functional overlap between these family members. We have recently identified small molecule inhibitors of Akt. These compounds have pleckstrin homology domain-dependent, isozyme-specific activity. In this report, we present data showing the relative contribution that inhibition of the different isozymes has on the apoptotic response of tumor cells to a variety of chemotherapies. In multiple cell backgrounds, maximal induction of caspase-3 activity is achieved when both Akt1 and Akt2 are inhibited. This induction is not reversed by overexpression of functionally active Akt3. The level of caspase-3 activation achieved under these conditions is equivalent to that observed with the phosphatidylinositol-3-kinase inhibitor LY294002. We also show that in different tumor cell backgrounds inhibition of mammalian target of rapamycin, a downstream substrate of Akt, is less effective in inducing caspase-3 activity than inhibition of Akt1 and Akt2. This shows that the survival phenotype conferred by Akt can be mediated by signaling pathways independent of mammalian target of rapamycin in some tumor cell backgrounds. Finally, we show that inhibition of both Akt1 and Akt2 selectively sensitizes tumor cells, but not normal cells, to apoptotic stimuli.

Allosteric Akt (PKB) inhibitors: discovery and SAR of isozyme selective inhibitors.[Pubmed:15664853]

Bioorg Med Chem Lett. 2005 Feb 1;15(3):761-4.

This letter describes the development of two series of potent and selective allosteric Akt kinase inhibitors that display an unprecedented level of selectivity for either Akt1, Akt2 or both Akt1/Akt2. An iterative analog library synthesis approach quickly provided a highly selective Akt1/Akt2 inhibitor that induces apoptosis in tumor cells and inhibits Akt phosphorylation in vivo.

AKT inhibitor VIII (AKTi-1/2) is a cell-permeable quinoxaline compound that has been shown to potently, selectively, allosterically, and reversibly inhibit Akt1, Akt2, and Akt3 activity with IC50s of 58 nM, 210 nM, and 2119 nM, respectively.

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