PI3Kα Inhibitor

LY294002 is a broad-spectrum inhibitor of PI3K with IC₅₀s of 0.5, 0.57, and 0.97 μM for PI3Kα, PI3Kδ and PI3Kβ, respectively. LY294002 also inhibits CK2 with an IC₅₀ of 98 nM. LY294002 is a competitive DNA-PK inhibitor that binds reversibly to the kinase domain of DNA-PK with an IC₅₀ of 1.4 μM. LY294002 is an apoptosis activator.

Alpelisib (BYL-719) is an orally active PI3Kα-selective inhibitor that blocks the conversion of PIP2 to PIP3, thereby inhibiting pathways including PI3K/AKT/mTOR, MAPK/ERK, Notch and JAK-STAT. Alpelisib also induces apoptosis, G0/G1 phase arrest and senescence; it significantly inhibits the proliferation, self-renewal, stemness and epithelial-mesenchymal transition (EMT) of tumor cells, reduces cancer stem cell populations and decreases the expression of stem cell markers. Alpelisib not only enhances the sensitivity to Eribulin (HY-13442) and exerts a synergistic effect with Paclitaxel (HY-B0015), but may also induce drug resistance by upregulating the SGK3/GSK3β/β-catenin signaling pathway. Alpelisib can be applied to research related to breast cancer, gastric cancer and lipomas associated with PTEN hamartoma tumor syndrome.

Inavolisib (GDC-0077) is a potent, orally active, and selective PI3Kα inhibitor (IC₅₀=0.038 nM). Inavolisib exerts its activity by binding to the ATP binding site of PI3K, thereby inhibiting the phosphorylation of PIP2 to PIP3. Inavolisib is more selective for mutant versus wild-type PI3Kα. Inavolisib can be used for the study of breast cancer.

Pictilisib (GDC-0941) is a potent inhibitor of PI3Kα/δ with an IC₅₀ of 3 nM, with modest selectivity against p110β (11-fold) and p110γ (25-fold).

Idelalisib (CAL-101; GS-1101) is a highly selective and orally bioavailable p110δ inhibitor with an IC₅₀ of 2.5 nM, showing 40- to 300-fold selectivity for p110δ over other PI3K class I enzymes.

PIK-124 is a thiazolidinone-based PI3Kγ-biased PI3K inhibitor, with an IC₅₀ of 3 nM against PI3Kγ. PIK-124 exhibits cross-reactivity with PI3Kα (IC₅₀ = 23 nM), PI3Kδ (IC₅₀ = 340 nM), PI3KC2α (IC₅₀ = 140 nM) and PI3KC2β (IC₅₀ = 370 nM). PIK-124 is applicable to breast cancer-related research.

AM-8508 is an orally bioactive PI3Kδ inhibitor with an IC₅₀ of 0.016 μM. AM-8508 selectively inhibits PI3Kδ, thereby blocking AKT phosphorylation mediated by the B cell receptor. AM-8508 suppresses the formation of antigen-specific IgG and IgM in rats immunized with keyhole limpet hemocyanin. AM-8508 can be used for the research of inflammatory diseases.

Buparlisib (BKM120; NVP-BKM120) is a pan-class I PI3K inhibitor, with blood-brain barrier permeability. Buparlisib has IC₅₀s of 52, 166, 116 and 262 nM for p110α, p110β, p110δ and p110γ, respectively.

Dactolisib (BEZ235) is an orally active and dual pan-class I PI3K and mTOR kinase inhibitor with IC₅₀s of 4 nM/5 nM/7 nM/75 nM, and 20.7 nM for p110α/p110γ/p110δ/p110β and mTOR, respectively. Dactolisib (BEZ235) inhibits both mTORC1 and mTORC2.

Gedatolisib (PKI-587) is a highly potent dual inhibitor of PI3Kα, PI3Kγ, and mTOR with IC₅₀s of 0.4 nM, 5.4 nM and 1.6 nM, respectively. Gedatolisib is equally effective in both complexes of mTOR, mTORC1 and mTORC2.

Copanlisib (BAY 80-6946) is a potent, selective and ATP-competitive pan-class I PI3K inhibitor, with IC₅₀s of 0.5 nM, 0.7 nM, 3.7 nM and 6.4 nM for PI3Kα, PI3Kδ, PI3Kβ and PI3Kγ, respectively. Copanlisib has more than 2,000-fold selectivity against other lipid and protein kinases, except for mTOR. Copanlisib has superior antitumor activity.

Duvelisib (IPI-145) is a selectivite p100δ inhibitor with IC₅₀ of 2.5 nM, 27.4 nM, 85 nM and 1602 nM for p110δ, P110γ, p110β and p110α, respectively.

Eganelisib (IPI549) is a potent and selective PI3Kγ inhibitor with an IC₅₀ of 16 nM. Eganelisib shows >100-fold selectivity over other lipid and protein kinases.

Omipalisib (GSK2126458) is an orally active and highly selective inhibitor of PI3K with K_is of 0.019 nM/0.13 nM/0.024 nM/0.06 nM and 0.18 nM/0.3 nM for p110α/β/δ/γ, mTORC1/2, respectively. Omipalisib has anti-cancer activity.

PI-103 is a potent PI3K and mTOR inhibitor with IC₅₀s of 8 nM, 88 nM, 48 nM, 150 nM, 20 nM, and 83 nM for p110α, p110β, p110δ, p110γ, mTORC1, and mTORC2. PI-103 also inhibits DNA-PK with an IC50 of 2 nM. PI-103 induces autophagy.

hSMG-1 inhibitor 11j, a pyrimidine derivative, is a potent and selective inhibitor of hSMG-1, with an IC₅₀ of 0.11 nM. hSMG-1 inhibitor 11j exhibits >455-fold selectivity for hSMG-1 over mTOR (IC₅₀=50 nM), PI3Kα/γ (IC₅₀=92/60 nM) and CDK1/CDK2 (IC₅₀=32/7.1 μM). hSMG-1 inhibitor 11j can be used for the research of cancer.

YM-201636 is a potent and selective PIKfyve inhibitor with an IC₅₀ of 33 nM. YM-201636 also inhibits p110α with an IC₅₀ of 3.3 μM. YM-201636 inhibits retroviral replication.

Paxalisib (GDC-0084) is a brain penetrant inhibitor of PI3K and mTOR, with K_is of 2 nM, 46 nM, 3 nM, 10 nM and 70 nM for PI3Kα PI3Kβ, PI3Kδ, PI3Kγ and mTOR, respectively.

Fimepinostat (CUDC-907) potently inhibits class I PI3Ks as well as classes I and II HDAC enzymes with an IC₅₀ of 19/54/39 nM and 1.7/5.0/1.8/2.8 nM for PI3Kα/PI3Kβ/PI3Kδ and HDAC1/HDAC2/HDAC3/HDAC10 , respectively.

Copanlisib dihydrochloride (BAY 80-6946 dihydrochloride) is a potent, selective and ATP-competitive pan-class I PI3K inhibitor, with IC₅₀s of 0.5 nM, 0.7 nM, 3.7 nM and 6.4 nM for PI3Kα, PI3Kδ, PI3Kβ and PI3Kγ, respectively. Copanlisib dihydrochloride has more than 2,000-fold selectivity against other lipid and protein kinases, except for mTOR. Copanlisib dihydrochloride has superior antitumor activity.