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Published on: February 21, 2019
Identification of novel natural inhibitors targeting AKT Serine/Threonine Kinase 1 (AKT1) by computational study
Sheng Zhong1, Zhiyun Zhang2, Zhen Guo2
1Neurosurgery and Neuro-Oncology Department, Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China.
Abstract:
Despite great progress, the current cancer treatments often have obvious toxicity and side effects. and a poor prognosis (some patients). One of the reasons for the poor prognosis is that certain enzymes prevent anticancer drugs from killing tumor cells. AKT1 is involved in regulating PI3K/AKT/mTOR, a tumor-generating pathway. Ipatasertib, a highly selective inhibitor of AKT1, is widely used in the treatment of tumors. In this study, many structural and biochemical methodswere used to find better AKT1(Threonine Kinase 1) inhibitors, which laid a foundation for the further development of AKT1 inhibitors and provided new drugs for the treatment of tumors. ZINC15 database and Discovery Studio 4.5, a computer-aided drug screening software with many modules (LibDock for virtual screening, ADME (Absorption, Distribution, Metabolism, Excretion) and TOPKAT (toxicity prediction module) for the toxicity and properties analysis, and MD simulation for stability prediction), were employed. CCK8 assay, ELISA assay genicity and higher tolerance to cytochrome P4502D6. MD simulations indicated they could bind with AKT1 stably in the natural environment. The cell experiment and specific assay for AKT1 inhibition showed they could inhibit the proliferation and AKT1 expression of MG63 cells (Osteosarcoma cells). Moreover, these novel compounds with structural modifications can be potential contributors that lead to further rational drug design for targeting AKT1.AbbreviationAKT1, AKT Serine/Threonine Kinase 1; ADME, absorption, distribution, metabolism, excretion; TOPKAT, toxicity prediction by Computer assisted technology; CCK8, Cell Counting Kit 8; ELISA, Enzyme-linked immunosorbent assay; CYP2D6, cytochrome P4502D6 inhibition; GBM, Glioblastoma; AGC kinase, protein kinase A, G, and C families (PKA, PKC, PKG); PKB, protein kinase B; PAM pathway, PI3K/AKT/mTOR pathway; OS, overall survival; PFS, progression-free survival; LD50, lethal dose half in rats; LOAEL, lowest observed adverse effect level; NPT, normal pressure and temperature; PME, particle mesh Ewald; LINCS, linear constraint solver; RMSD, root-mean-square deviation; BBB, blood-brain barrier; DS, Discovery Studio; DTP, Developmental toxicity potential; PPB, Plasma protein binding; MTD, Maximum Tolerated Dosage; AB, Aerobic Biodegradability; NTP, US. National Toxicology Program; DTP, developmental toxicity potential.
Insights
Researchers identified novel AKT1 inhibitors to improve cancer treatment. These compounds show potential for inhibiting tumor cell growth and AKT1 expression, offering new therapeutic avenues with reduced toxicity.
Area of Science:
- Oncology
- Medicinal Chemistry
- Biochemistry
Background:
- Current cancer therapies face challenges with toxicity and limited efficacy.
- The PI3K/AKT/mTOR pathway is crucial in tumor development, making AKT1 a key therapeutic target.
- Existing AKT1 inhibitors like Ipatasertib are used, but there is a need for improved drug candidates.
Purpose of the Study:
- To discover and characterize novel, potent AKT1 inhibitors.
- To lay the groundwork for developing improved AKT1-targeted cancer therapies.
- To identify drug candidates with enhanced properties and reduced toxicity.
Main Methods:
- Utilized the ZINC15 database and Discovery Studio 4.5 for computer-aided drug screening (virtual screening, ADME, TOPKAT, MD simulations).
- Employed structural and biochemical methods to evaluate inhibitor candidates.
- Conducted cell-based assays (CCK8, ELISA) to assess efficacy and inhibition of AKT1 expression in MG63 osteosarcoma cells.
Main Results:
- Identified novel compounds with potential for AKT1 inhibition.
- MD simulations confirmed stable binding of inhibitors with AKT1.
- Cell experiments demonstrated inhibition of MG63 cell proliferation and AKT1 expression by the novel compounds.
- Compounds exhibited favorable ADME properties and higher tolerance to cytochrome P4502D6.
Conclusions:
- Novel AKT1 inhibitors were successfully identified through computational and experimental approaches.
- These compounds show promise for developing next-generation AKT1-targeted cancer drugs.
- Structural modifications offer a basis for rational drug design targeting AKT1 in cancer treatment.
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