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].
Références:
- [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.
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PI3Kα Produits associés (240)
Produits associés (240)
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FD274
0 ImagesFD274 is a highly potent PI3K/mTOR dual inhibitor with IC50s of 0.65 nM, 1.57 nM, 0.65 nM, 0.42 nM, and 2.03 nM against PI3Kα/β/γ/δ and mTOR, respectively. FD274 exhibits significant anti-proliferation of AML cell lines (HL-60 and MOLM-16). FD274 arrests HL-60 cell cycle at G1 phase and increases apoptosis. FD274 demonstrates dose-dependent inhibition of tumor growth in the HL-60 xenograft model. FD274 has the potential for acute myeloid leukemia research.
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CHMFL-PI4K-127
0 ImagesCHMFL-PI4K-127 (compound 15g) is an orally active, potent and high selective PfPI4K (Plasmodium falciparum PI4K kinase) inhibitor, with an IC50 of 0.9 nM. CHMFL-PI4K-127 exhibits potent activity against 3D7 Plasmodium falciparum, with an EC50 of 25.1 nM. CHMFL-PI4K-127 shows antimalaria efficacy.
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PI3Kδ-IN-16
0 ImagesPI3Kδ-IN-16 is a potent and selective PI3Kδ inhibitor with an IC50 value of 0.9 nM. PI3Kδ-IN-16 has a strong anti-proliferative effect on SU-DHL-6 cells, causing cell cycle arrest and inducing apoptosis. PI3Kδ-IN-16 tightly bins to PI3Kδ protein with a planar-shaped conformation. The kinase activity of PI3Kδ-IN-16 which is ~378-fold over PI3Kα, 412-fold over PI3Kβ, and 10-fold over PI3Kγ. PI3Kδ-IN-16 can be used for the study of hematologic malignancies.
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Umbralisib tosylate
0 ImagesCat. No.: HY-12279ACAS No.: 1532533-72-4Synonyms: TGR-1202 tosylate; RP5264 tosylateUmbralisib (TGR-1202) tosylate is an orally active, potent and selective dual PI3Kδ and casein kinase-1-ε (CK1ε) inhibitor, with EC50 of 22.2 nM and 6.0 μM, respectively. Umbralisib tosylate exhibits unique immunomodulatory effects on chronic lymphocytic leukemia (CLL) T cells. Umbralisib tosylate can be used for haematological malignancies reseach.
