PI3Kα
PI3Kα (p110α), encoded by PIK3CA, is a class IA phosphoinositide 3-kinase catalytic subunit that forms a heterodimer with p85 regulatory proteins and catalyzes the phosphorylation of phosphatidylinositol-(4,5)-bisphosphate to generate phosphatidylinositol-(3,4,5)-trisphosphate, thereby regulating cell growth, proliferation, survival, migration, and metabolic signaling[1][2]. Mechanistically, PI3Kα is a central component of the PI3K-AKT-mTOR signaling axis and functions downstream of receptor tyrosine kinases and RAS proteins to amplify intracellular growth and survival pathways[3][4]. Dysregulation of this pathway is among the most common molecular events in human cancer, and activating mutations in PIK3CA promote tumor initiation, progression, and therapeutic resistance through sustained PI3K signaling[3][5]. In disease models, disruption of the RAS-PI3Kα interaction suppresses tumor growth and angiogenesis, highlighting the importance of PI3Kα-dependent signaling in oncogenic processes[4]. Compared with related class I PI3K isoforms, p110α and p110β are broadly expressed across tissues, whereas p110δ is predominantly expressed in leukocytes, indicating distinct physiological functions and therapeutic opportunities among isoforms[6]. Furthermore, PTEN-deficient tumors frequently depend on p110β activity, emphasizing a biologically important distinction between PI3Kα- and PI3Kβ-driven signaling networks[2]. For experimental and translational applications, isoform-selective PI3Kα inhibitors, including alpelisib, have been developed to target PIK3CA-driven malignancies, making PI3Kα a major focus of precision oncology research[5].
References:
- [1]. PI3Kα gene information from NCBI.
- [2]. Mazloumi Gavgani F, et al. Class I Phosphoinositide 3-Kinase PIK3CA/p110α and PIK3CB/p110β Isoforms in Endometrial Cancer. Int J Mol Sci. 2018 Dec 7;19(12):3931. [Content Brief]
- [3]. Wang Y, et al. Oncogenic activation of PIK3CA in cancers: Emerging targeted therapies in precision oncology. Genes Dis. 2024 Sep 10;12(2):101430. [Content Brief]
- [4]. Czyzyk D, et al. Structural insights into isoform-specific RAS-PI3Kα interactions and the role of RAS in PI3Kα activation. Nat Commun. 2025 Jan 9;16(1):525. [Content Brief]
- [5]. 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. [Content Brief]
- [6]. Wikipedia.
- [7]. Wikipedia.
-
PI3Kα Related Products (236)
Related Products (236)
-
PI3K/mTOR Inhibitor-12
0 ImagesCat. No.: HY-152238CAS No.: 2891692-83-2
-
MEK/PI3K-IN-2
0 ImagesCat. No.: HY-144693CAS No.: 2281803-33-4
-
PP487
0 ImagesCat. No.: HY-15268CAS No.: 1092787-12-6
-
PI3Kα-IN-30
0 ImagesCat. No.: HY-182368PI3Kα-IN-30 is an orally active, selective PI3Kα inhibitor with an IC50 of 2.8 nM. PI3Kα-IN-30 inhibits cancer cell proliferation, as well as the phosphorylation of Akt (S473) and pS6 (S240/244). PI3Kα-IN-30 shows low growth inhibitory activity against normal somatic cell lines at a concentration of 30 μM. PI3Kα-IN-30 induces cancer cell apoptosis and exerts anti-tumor efficacy in xenograft models. PI3Kα-IN-30 can be used for the research of breast cancer.
-
LCI40
0 ImagesCat. No.: HY-183770LCI40 is an orally active dual PI3K/BRD4 inhibitor (PI3Kα IC50 = 0.071 μM, PI3Kβ IC50 = 0.17 μM, PI3Kγ IC50 = 0.66 μM, PI3Kδ IC50 = 0.072 μM, BRD4 BD1 IC50 = 0.19 μM, and BRD4 BD2 IC50 = 1.88 μM. LCI40 inhibits phosphorylation of pAKT (S473) and suppresses c-MYC levels in mantle cell lymphoma cells. LCI40 displays immunomodulatory capacity with minimal toxicity to normal mouse immune cells. LCI40 can be used for the research of mantle cell lymphoma.
-
PI3K-IN-35
0 ImagesCat. No.: HY-147900CAS No.: 2458163-99-8
-
IMM-H012
0 ImagesCat. No.: HY-181581CAS No.: 2231399-03-2IMM-H012 is a specific PI3K inhibitor with an IC50 of 0.80 nM against PI3Kα. IMM-H012 combined with [177Lu]Lu-P4 shows synergistic antitumor effects against stomach cancer and lung cancer.
-
HM5023507
0 ImagesCat. No.: HY-177277CAS No.: 1549766-06-4HM5023507 is an orally active and selective PI3Kδ/γ inhibitor with IC50s of 4 and 5 μM for PI3Kδ and PI3Kγ over PI3Kβ and PI3Kα. HM5023507 attenuates the PI3Kδ/γ signaling in human basophils. HM5023507 also attenuates the activation and function of human B and T cells and cytokine and IgG production during cocultures, and Th17 differentiation of CD4 T cells. HM5023507 inhibited semiestablished collagen-induced arthritic inflammation in the rat models. HM5023507 can be used for inflammatory diseases like rheumatoid arthritis research.
-
PI3Kα-IN-11
0 ImagesCat. No.: HY-153915CAS No.: 300803-79-6PI3Kα-IN-11 is a potent PI3Kα inhibitor with anticancer activity.
-
PI3Kγ inhibitor 7
0 ImagesCat. No.: HY-153703CAS No.: 2575863-25-9PI3Kγ inhibitor 7 (compound 2) is a potent and orally active PI3Kγ inhibitor with IC50 values of 4768, 878.1, 3.42, 355.2 nM for PI3Kα, PI3Kβ, PI3Kγ, PI3Kδ, respectively. PI3Kγ inhibitor 7 shows antitumor activity. PI3Kγ inhibitor 7 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.
-
MEK/PI3K-IN-1
0 ImagesCat. No.: HY-144692CAS No.: 2281803-28-7
-
SRX3305
0 ImagesCat. No.: HY-182671CAS No.: 2409965-28-0SRX3305 is an BTK/PI3K/BRD4 inhibitor with IC50s of 6.5 nM, 15 nM, and 4 nM toward BTK, PI3Kɑ and PI3Kδ, respectively. SRX3305 attenuates chronic lymphocytic leukemia (CLL) and mantle cell lymphoma (MCL) cell proliferation and promotes apoptosis in a dose-dependent fashion. SRX3305 yields potent anti-tumor effects but spares healthy bystander cells. SRX3305 inhibits the activation-induced proliferation of primary CLL cells in vitro and effectively blocks microenvironment-mediated survival signals. SRX3305 blocks CLL cell migration toward CXCL-12 and CXCL-13. SRX3305 maintains its anti-tumor effects in Ibrutinib (HY-10997)-resistant CLL cells. SRX3305 can be used for research in CLL, diffuse large B-cell lymphoma (DLBCL) and MCL.
-
CDK8-IN-19
0 ImagesCat. No.: HY-176282CDK8-IN-19 (Compound 3d) is a CDK8 inhibitor with an IC50 of 25.08 nM. CDK8-IN-19 has a broad-spectrum anticancer activity, such as leukemia, melanoma and breast cancer, without significant cytotoxic effect on the normal Vero cells (mean IC50s of 2.87, 3.65, 3.79 and 45.48 μM, respectively).
-
XJTU-L453
0 ImagesCat. No.: HY-169019CAS No.: 3008290-92-1XJTU-L453 is a PI3Kα inhibitor with an IC50 value of 0.4 nM. XJTU-L453 can inhibit the proliferation of breast cancer cell lines T47D and MCF7, with IC50 values of 0.2 μM and 0.5 μM, respectively. XJTU-L453 can inhibit the PI3K pathway, induce cell cycle arrest, and trigger cell apoptosis (apoptosis). XJTU-L453 also has antitumor activity in MCF7 xenograft mice.
-
HL-2
0 ImagesCat. No.: HY-143277CAS No.: 2766352-49-0HL-2 is a ligand of the target protein PI3K kinase of HL-8 (HY-143275), which can be used for PROTAC synthesis.
-
Flupentixol
0 ImagesFlupentixol is an orally active D1/D2 dopamine receptor antagonist and new PI3K inhibitor (PI3Kα IC50=127 nM). Flupentixol shows anti-proliferative activity to cancer cells and induces apoptosis. Flupentixol can also be used in schizophrenia, anxiolytic and depressive research.
-
PI3Kα-IN-33
0 ImagesCat. No.: HY-183787PI3Kα-IN-33 is an orally active and selective PI3Kα inhibitor with an IC50 of 9.9 nM. PI3Kα-IN-33 blocks the PI3K/Akt/mTOR signaling pathway. PI3Kα-IN-33 induces apoptosis and triggers G2/M-phase arrest via Cyclin B1 and CDK1 downregulation. PI3Kα-IN-33 can be used for the research of colorectal cancer.
-
IHMT-PI3K-455
0 ImagesCat. No.: HY-149493CAS No.: 3047746-40-4IHMT-PI3K-455 (Compound 15u) is a potent, selective, orally active PI3Kγ/δ dual inhibitor with IC50s of 7.1 nM and 0.57 nM for PI3Kγ and PI3Kδ, respectively. IHMT-PI3K-455 suppresses the AKT phosphorylation. IHMT-PI3K-455 inhibits tumor growth by recruiting and activating more CD8+ killing T cells.IHMT-PI3K-455 is used in cancer research.
