2. Signaling Pathways
  3. PI3K/Akt/mTOR
  4. PI3K

PI3K

Phosphoinositide 3-kinase

PI3K

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PI3K (Phosphoinositide 3-kinase), via phosphorylation of the inositol lipid phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2), forms the second messenger molecule phosphatidylinositol (3,4,5)-trisphosphate (PI(3,4,5)P3) which recruits and activates pleckstrin homology domain containing proteins, leading to downstream signalling events crucial for proliferation, survival and migration. Class I PI3K enzymes consist of four distinct catalytic isoforms, PI3Kα, PI3Kβ, PI3Kδ and PI3Kγ.

There are three major classes of PI3K enzymes, being class IA widely associated to cancer. Class IA PI3K are heterodimeric lipid kinases composed of a catalytic subunit (p110α, p110β, or p110δ; encoded by PIK3CA, PIK3CB, and PIK3CD genes, respectively) and a regulatory subunit (p85).

The PI3K pathway plays an important role in many biological processes, including cell cycle progression, cell growth, survival, actin rearrangement and migration, and intracellular vesicular transport.

PI3K Isoform Specific Products:

PI3K Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-N0910
    Notoginsenoside Ft1
    		Inhibitor 98.0%
    NotoginsenosideFt1 is a saponin found in Panax notoginseng. Notoginsenoside Ft1 inhibits the PI3K/AKT/mTOR signaling pathway, activates the p38 MAPK and ERK1/2 signaling pathways, and increases the proportion of CD8+ T cells, thereby inducing apoptosis and lysosomal cell death in various cancer cells, and promoting angiogenesis. Notoginsenoside Ft1 causes vasodilation by activating glucocorticoid receptors (GR) and estrogen receptor beta (ERβ) in endothelial cells. Notoginsenoside Ft1 increases intracellular Ca2+ accumulation, reduces cAMP levels by activating a signaling network mediated through P2Y12 receptors, and promotes platelet aggregation, thereby exerting a procoagulant effect. Notoginsenoside Ft1 inhibits ferroptosis (ferroptosis) in renal tubular epithelial cells by activating the TGR5 receptor, thereby demonstrating a renal protective effect. Notoginsenoside Ft1 acts as a TGR5 agonist and an FXR antagonist to combat obesity and insulin resistance.
    Notoginsenoside Ft1
  • HY-100398
    PF-04979064
    		Inhibitor 99.93%
    PF-04979064 is a potent and selective PI3K/mTOR dual kinase inhibitor with Kis of 0.13 nM and 1.42 nM for PI3Kα and mTOR, respectively.
    PF-04979064
  • HY-N0534
    Vitexin-2"-O-rhamnoside
    		Inhibitor 99.36%
    Vitexin-2"-O-rhamnoside is an orally active flavonoid glycoside. Vitexin-2"-O-rhamnoside inhibits Apoptosis, increases the phosphorylation levels of PI3K/Akt, inhibits caspase-3, SOD activity, and promotes cytokine (IL-2, IL-6, and IL-12) secretion. Vitexin-2"-O-rhamnoside strongly inhibits DNA synthesis in MCF-7 cells with an IC50 of 17.5 μM. Vitexin-2"-O-rhamnoside enhances immune function and improves the absorption of active compounds. Vitexin-2"-O-rhamnoside has antioxidant activity. Vitexin-2"-O-rhamnoside is used in the study of cardiovascular disease and immune-related diseases.
    Vitexin-2
  • HY-17044A
    Duvelisib (R enantiomer)
    		Inhibitor 99.00%
    Duvelisib R enantiomer is a PI3K inhibitor, which is the less active enantiomer of Duvelisib.
    Duvelisib (R enantiomer)
  • HY-109198
    Zandelisib
    		Inhibitor 99.72%
    Zandelisib (ME-401) is a selective, orally active, non-covalent inhibitor of PI3Kδ. Zandelisib can sustainably inhibit AKT phosphorylation and downstream signaling pathways. Zandelisib can be used in the study of malignancies such as relapsed/refractory B-cell lymphoma.
    Zandelisib
  • HY-10109
    AS-605240
    		Inhibitor 99.36%
    AS-605240 is a specific and orally active inhibitor of the PI3Kγ, with an IC50 of 8 nM, and a Ki of 7.8 nM.
    AS-605240
  • HY-101146
    SF2523
    		Inhibitor 99.34%
    SF2523 is a highly selective and potent inhibitor of PI3K with IC50s of 34 nM, 158 nM, 9 nM, 241 nM and 280 nM for PI3Kα, PI3Kγ, DNA-PK, BRD4 and mTOR, respectively.
    SF2523
  • HY-N2420
    Flavokawain A
    		Inhibitor 99.93%
    Flavokawain A is a chalcone compound and an orally active inhibitor of PRMT5 and cytochrome P450. Flavokawain A has anti-inflammatory, anti-tumor, and immunomodulatory effects. Flavokawain A can inhibit the proliferation of tumor cells and induce apoptosis. Flavokawain A can be used in the research of diseases such as bladder cancer.
    Flavokawain A
  • HY-N2554
    Osthenol
    		Inhibitor 99.27%
    Osthenol (Ostenol) is a reversible, selective, competitive inhibitor of hMAO-A (IC50=0.74 μM, Ki=0.26 μM), with antifungal and antibacterial activity. Osthenol inhibits the oxidative deamination of hMAO-A and regulates the metabolism of monoamine neurotransmitters. Osthenol also inhibits the PI3K/AKT signaling pathway to induce apoptosis of colon cancer cells, arrest the cell cycle at the G1 phase, and inhibit cell proliferation. Osthenol is mainly used in the study of neurological diseases and cancer, especially depression-related MAO-A targeted intervention and colon cancer.
    Osthenol
  • HY-N1431
    Tabersonine
    		Inhibitor 98.14%
    Tabersonine is a selective, orally active NLRP3 inhibitor. Tabersonine directly binds to the NACHT domain of NLRP3, inhibiting its ATPase activity and oligomerization, thereby blocking ASC spot formation and caspase-1 activation, and reducing the release of pro-inflammatory cytokines such as IL-1β. Tabersonine also inhibits K63-linked ubiquitination of TRAF6, blocking NF-κB, PI3K/Akt, and p38 MAPK signaling pathways. Tabersonine can inhibit inflammatory responses, induce apoptosis of liver cancer cells through mitochondrial pathways and death receptor pathways, reduce mitochondrial membrane potential, promote cytochrome c release, and activate caspase proteins. Tabersonine is mainly used in the study of NLRP3-driven inflammatory diseases (such as acute lung injury, sepsis, peritonitis) and tumors such as liver cancer.
    Tabersonine
  • HY-N0735
    Phellodendrine chloride
    		Inhibitor 99.79%
    Phellodendrine chloride is an orally active plant alkaloid. Phellodendrine chloride inhibits the proliferation of KRAS-mutated pancreatic cancer cells by suppressing macropinocytosis and glutamine metabolism, inducing ROS accumulation and mitochondrial apoptosis. Phellodendrine chloride promotes autophagy by activating the AMPK/mTOR pathway, alleviating intestinal damage in ulcerative colitis. Phellodendrine chloride can alleviate gouty arthritis by inhibiting the IL-6/STAT3 signaling pathway. Phellodendrine chloride suppresses allergic reactions by altering the conformation of MRGPRB3/MRGPRX2 protein, thereby inhibiting the activation of PKC and subsequent downstream MAPK and NF-κB signaling. Phellodendrine chloride inhibits the AKT/NF-κB pathway and down-regulates the expression of COX-2, thereby protecting zebrafish embryos from oxidative stress. Phellodendrine chloride has an anti-major depressive disorder (MDD) effect by down-regulating CHRM1, HTR1A, and the PI3K/Akt signaling pathway.
    Phellodendrine chloride
  • HY-N2110
    Phellopterin
    		Inhibitor 99.94%
    Phellopterin, an orally active furocoumarin with multiple biological activities. Phellopterin is a partial agonist of the central benzodiazepine receptors. Phellopterin exerts anti-inflammatory effects by upregulating SIRT1, downregulating ICAM-1 (reducing chronic inflammation, aiding diabetic ulcer healing), inhibiting STAT3 phosphorylation (easing atopic dermatitis inflammation), regulating Akt/PKC pathways (lowering TNF-α-induced VCAM-1 to block monocyte adhesion), and inhibiting TLR4/NF-κB pathway and macrophage M2 polarization (alleviating colitis-related cancers). Phellopterin suppresses ovarian cancer progression via inhibiting the PU.1/CLEC5A/PI3K-AKT loop (inducing cell cycle arrest, apoptosis, DNA damage). Phellopterin alleviates murine diabetes by promoting adipocyte differentiation and increasing PPARγ. Phellopterin also has anti-HSV-1 activity. Phellopterin can be used for studying anti-inflammation, anti-cancer (e.g., ovarian cancer, colitis cancer), blood glucose lowering, anti-diabetes, and anti-virus.
    Phellopterin
  • HY-N1476
    Heterophyllin B
    		Modulator 99.93%
    Heterophyllin B is an active cyclic peptide isolated from Pseudostellaria heterophylla. Heterophyllin B provides a novel strategy for the treatment of esophageal cancer.
    Heterophyllin B
  • HY-106012
    PI4K-IN-1
    		Inhibitor 98.61%
    PI4K-IN-1 (compound 44) is a potent PI4KIII inhibitor, with pIC50 values of 9.0 and 6.6 for PI4KIIIα and PI4KIIIβ, respectively. PI4K-IN-1 also inhibits PI3Kα/β/γ/δ, with pIC50 values of 4.0/<3.7/5.0/<4.1, respectively.
    PI4K-IN-1
  • HY-117548
    UNC1062
    		Inhibitor 98.92%
    UNC1062 is a highly selective tyrosine kinase (MERTK) inhibitor with an IC50 of 1.1 nM (Morrison Ki = 0.33 nM). UNC1062 exhibits good selectivity for the TAM family (TYRO3 IC50 = 60 nM, AXL IC50 = 85 nM). UNC1062 exhibits significant anti-proliferative effects and induces apoptosis in various cancer models (such as melanoma, gastric cancer, and acute myeloid leukemia). UNC1062 inhibits multiple pathways, including MAPK/ERK, PI3K/AKT and JAK/STAT and affects the motility of head and neck squamous cell carcinoma (HNSCC) cells through the RhoA signaling pathway. UNC1062 inhibits macrophage efferocytosis, and it suitable for research on atherosclerosis.
    UNC1062
  • HY-130413
    Protectin D1
    		Activator 99.10%
    Protectin D1, a neuroprotectin D1 produced by neuronal cells, is a member of a newly discovered family of bioactive products derived from docosahexaenoic acid. Protectin D1 also serves as a specialized pro-resolving mediator, exhibiting effective in vivo pro-resolving activity in various human disease models. Additionally, Protectin D1 is an inhibitor of NALP3 inflammasomes and regulates the PI3K/AKT and HIF-1α signaling pathways. Protectin D1 exerts anti-inflammatory effects by reducing ROS levels, inhibiting the expression of NALP3, ASC, and Caspase-1, and consequently decreasing the release of pro-inflammatory cytokines IL-1β and IL-18. Furthermore, Protectin D1 enhances miRNA-210 expression, activates the PI3K/AKT signaling pathway, and exerts cardioprotective effects. Protectin D1 holds promise for research in cardiovascular diseases and inflammatory disorders.
    Protectin D1
  • HY-10811
    GNE-493
    		Inhibitor 99.81%
    GNE-493 is a potent, selective, and orally available dual pan-PI3-kinase/mTOR inhibitor with IC50s of 3.4 nM, 12 nM, 16 nM, 16 nM and 32 nM for PI3Kα, PI3Kβ, PI3Kδ, PI3Kγ and mTOR.
    GNE-493
  • HY-17645
    Tenalisib
    		Inhibitor 98.83%
    Tenalisib (RP6530) is a novel, potent, and selective PI3Kδ and PI3Kγ inhibitor with IC50 values of 25 and 33 nM, respectively.
    Tenalisib
  • HY-112443
    AZD3458
    		Inhibitor 99.71%
    AZD3458 is a potent and remarkably selective PI3Kγ inhibitor with pIC50s of 9.1, 5.1, <4.5, and 6.5 for PI3Kγ, PI3Kα, PI3Kβ, and PI3Kδ, respectively.
    AZD3458
  • HY-20180
    Pictilisib dimethanesulfonate
    		Inhibitor 99.72%
    Pictilisib dimethanesulfonate (GDC-0941 dimethanesulfonate) is a potent inhibitor of PI3Kα/δ with IC50 of 3 nM, with modest selectivity against p110β (11-fold) and p110γ (25-fold).
    Pictilisib dimethanesulfonate
Cat. No. Product Name / Synonyms Application Reactivity
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Download PI3K Signaling Pathway Map.

Phosphatidylinositol 3 kinases (PI3Ks) are a family of lipid kinases that integrate signals from growth factors, cytokines and other environmental cues, translating them into intracellular signals that regulate multiple signaling pathways. These pathways control many physiological functions and cellular processes, which include cell proliferation, growth, survival, motility and metabolism[1]. 

 

In the absence of activating signals, p85 interacts with p110 and inhibits p110 kinase activity. Following receptor tyrosine kinase (RTK) or G protein-coupled receptor (GPCR) activation, class I PI3Ks are recruited to the plasma membrane, where p85 inhibition of p110 is relieved and p110 phosphorylates PIP2 to generate PIP3. The activated insulin receptor recruits intracellular adaptor protein IRS1. Phosphorylation of IRS proteins on tyrosine residues by the insulin receptor initiates the recruitment and activation of PI3K. PIP3 acts as a second messenger which promotes the phosphorylation of Akt at Thr308 by PDK-1. RTK activation can also trigger Ras-Raf-MEK-ERK pathway. Activated Akt, ERK and RSK phosphorylate TSC2 at multiple sites to inhibit TSC1-TSC2-TBC1D7, which is the TSC complex that acts as a GTPase-activating protein (GAP) for the small GTPase RHEB. During inhibition of the TSC complex, GTP-loaded RHEB binds the mTOR catalytic domain to activate mTORC1. Glycogen synthase kinase 3β (GSK-3β) activates the TSC complex by phosphorylating TSC2 at Ser1379 and Ser1383. Phosphorylation of these two residues requires priming by AMPK-dependent phosphorylation of Ser1387. Wnt signaling inhibits GSK-3β and the TSC complex, and thus activates mTORC1. mTORC2 is activated by Wnt in a manner dependent on the small GTPase RAC1. Akt activation contributes to diverse cellular activities which include cell survival, growth, proliferation, angiogenesis, metabolism, and migration. Important downstream targets of Akt are GSK-3, FOXOs, BAD, AS160, eNOS, and mTOR. mTORC1 negatively regulates autophagy through multiple inputs, including inhibitory phosphorylation of ULK1, and promotes protein synthesis through activation of the translation initiation promoter S6K and through inhibition of the inhibitory mRNA cap binding 4E-BP1[1][2][3].

 

PI3Kδ is a heterodimeric enzyme, typically composed of a p85α regulatory subunit and a p110δ catalytic subunit. In T cells, the TCR, the costimulatory receptor ICOS and the IL-2R can activate PI3Kδ. In B cells, PI3Kδ is activated upon crosslinking of the B cell receptor (BCR). The BCR co-opts the co-receptor CD19 or the adaptor B cell associated protein (BCAP), both of which have YXXM motifs to which the p85α SH2 domains can bind. In lumphocytes, BTK and ITK contribute to the activation of PLCγ and promotes the generation of DAG and the influx of Ca2+, which in turn activate PKC and the CARMA1-, BCL 10- and MALT1 containing (CBM) complex. The resulting NF-κB inhibitor kinase (IKK) activation leads to the phosphorylation and the degradation of IκB, and to the nuclear accumulation of the p50-p65 NF-κB heterodimer. MyD88 is an adapter protein that mediates signal transduction for most TLRs and leads to activation of PI3K[4].

 

Reference:

[1]. Thorpe LM, et al. PI3K in cancer: divergent roles of isoforms, modes of activation and therapeutic targeting.Nat Rev Cancer. 2015 Jan;15(1):7-24. 
[2]. Vanhaesebroeck B, et al. PI3K signalling: the path to discovery and understanding.Nat Rev Mol Cell Biol. 2012 Feb 23;13(3):195-203. 
[3]. Fruman DA, et al. The PI3K Pathway in Human Disease.Cell. 2017 Aug 10;170(4):605-635.
[4]. Lucas CL, et al. PI3Kδ and primary immunodeficiencies.Nat Rev Immunol. 2016 Nov;16(11):702-714. 

PI3K Isoform Comparison

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