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.
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PI3Kα Related Products (240)
Related Products (240)
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DS02312223
0 ImagesSynonyms: D223DS02312223 (D223) is a molecular glue that promotes the binding of RAS to PI3Kα, with a Kd of 0.76 μM for p110α. DS02312223 increases the binding affinity between GTP-bound KRAS (KRAS-GMPPNP) and p110α by nearly three orders of magnitude (KD = 0.017 μM). DS02312223 stimulates the translocation of GLUT4 to the plasma membrane. DS02312223 promotes glucose uptake in the absence of insulin. DS02312223 can be used in diabetes research.
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PI3K/mTOR Inhibitor-4
0 ImagesCat. No.: HY-128333CAS No.: 2361215-32-7
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SRX3207
0 ImagesSRX3207 is an orally active and first-in-class dual Syk/PI3K inhibitor, with IC50 values of 10.7 nM and 861 nM for Syk and PI3Kα, respectively. SRX3207 relieves tumor immunosuppression.
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PI3Kα-IN-9
0 ImagesCat. No.: HY-150618CAS No.: 2715287-67-3
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SRX3177
0 ImagesSRX3177 is a triple inhibitor of CDK4/6, PI3K, and BRD4, with IC50s of <2.5 nM (CDK4), 3.3 nM (CDK6), 33 nM (BRD4 BD1), 89 nM (BRD4 BD2), 79 nM (PI3Kα), 83 nM (PI3Kδ), 3.18 μM (PI3Kγ) , respectively. SRX3177 blocks the interaction between the SARS-CoV-2 E protein and the BRD2/4 BD1 domain, restores E protein-attenuated NF-κB activity. SRX3177 exerts broad cytotoxic activity against cancer cells. SRX3177 can be used for the study of anti-SARS-CoV-2 and cancer.
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PI-828
0 ImagesPI-828 is a dual PI3K and casein kinase 2 (CK2) inhibitor with IC50s of 173 nM, 149 nM, and 1127 nM for p110α, CK2, and CK2α2 in lipid kinase assay, respectively.
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PI3K/mTOR Inhibitor-11
0 ImagesPI3K/mTOR Inhibitor-11 is an orally active PI3K/mTOR inhibitor (IC50: 3.5, 4.6, and 21.3 nM for PI3Kα, PI3Kδ, and mTOR). PI3K/mTOR Inhibitor-11 regulates the PI3K/AKT/mTOR signaling pathway by inhibiting the phosphorylation of AKT and S6 proteins. PI3K/mTOR Inhibitor-11 can be used in the research of cancers.
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KTC1101
0 ImagesKTC1101 is an orally active pan-PI3K inhibitor. KTC1101 can inhibit the PI3K signaling pathway, reduce downstream AKT and mTOR phosphorylation, and reduces the expression of Ki67. The anti-tumor effect of KTC1101 has a dual mechanism of action: directly inhibiting tumor cell growth and dynamically enhancing immune response.
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PROTAC PI3Kα degrader-1
0 ImagesCat. No.: HY-174461Purity: 99.21%PROTAC PI3Kα degrader-1 is a PI3Kα PROTAC degrader that recruits CRBN, with a DC50 of 0.08 μM in T47D breast cancer cells. PROTAC PI3Kα degrader-1 inhibits the phosphorylation of AKT at the Ser473 site in cancer cells and exhibits in vivo anticancer efficacy in xenograft models. PROTAC PI3Kα degrader-1 can be used in cancer-related research.
