4'-Methylchrysoeriol is a potent inhibitor of Cytochrome P450 enzymes, with an IC50 of 19 nM for human P450 1B1-dependent EROD.
Schisandrol B is one of its major active constituents of traditional hepato-protective Chinese medicine, Schisandra sphenanthera.IC50 value:Target:in vitro: SolB pretreatment significantly attenuated the increases in alanine aminotransferase and aspartate aminotransferase activity, and prevented elevated hepatic malondialdehyde formation and the depletion of mitochondrial glutathione (GSH) in a dose-dependent manner. SolB also dramatically altered APAP metabolic activation by inhibiting the activities of CYP2E1 and CYP3A11, which was evidenced by significant inhibition of the formation of the oxidized APAP metabolite NAPQI-GSH [1]. SolB abrogated APAP-induced activation of p53 and p21, and increased expression of liver regeneration and antiapoptotic-related proteins such as cyclin D1 (CCND1), PCNA, and BCL-2.
CYP1B1-IN-5 (Compound 6q) is a potent and selective cytochrome P450 1B1 (CYP1B1) inhibitor with an IC50 of 4.7 nM[1].
SR9186 (ML368) is a potent CYP3A4 inhibitor with IC50 s for inhibition of midazolam → 1′hydroxymidazolam, testosterone → 6β-hydroxytestosterone, and vincristine → vincristine M1 of 9, 4, and 38 nM, respectively. SR-9186 inhibits liver-stage development of P. falciparum to block ivermectin metabolism[1].
Chalepensin, a furanocoumarin, is a competitive CYP2A6 inhibitor. Chalepensin also inhibits human CYP1A1, CYP1A2, CYP2A13, CYP2C9, CYP2D6, CYP2E1, and CYP3A4 to different extents[1].
Methysticin is a major kavalactone in kava extract to induce CYP1A1.
BergaptolA hydroxylated psoralen that acts as a potent inhibitors of debenzylation activity of CYP3A4 enzyme with an IC50 value of 24.92 uM. Recent studies suggest that it may have antiproliferative and anticancer properties.target: CYP3A4 [1]IC50: 24.92 [1]For in vivo enzyme activity analysis, 100 μM bergaptol was added to the cultures for an additional 24 h at 37°C. After centrifugation, the supernatant was used to measure the bergapten yield by high performance liquid chromatography (HPLC).[2]
Ketoconazole is an imidazole anti-fungal agent, a CYP3A4 and CYP24A1 inhibitor.Target: CYP3A4 CYP24A1Ketoconazole, an imidazole anti-fungal agent, has often produced features of androgen deficiency including decreased libido, gynecomastia, impotence, oligospermia, and decreased testosterone levels, in men being treated for chronic mycotic infections [1]. Ketoconazole also is a cytochrome P450 inhibitor [2].Ketoconazole (KTZ), on the antischistosomal potential of these quinolines against Schistosoma mansoni infection by evaluating parasitological, histopathological, and biochemical parameters. Mice were classified into 7 groups: uninfected untreated (I), infected untreated (II), infected treated orally with PZQ (1,000 mg/kg) (III), QN (400 mg/kg) (IV), KTZ (10 mg/kg)+QN as group IV (V), HF (400 mg/kg) (VI), and KTZ (as group V)+HF (as group VI) (VII). KTZ plus QN or HF produced more inhibition (P<0.05) in hepatic CYP450 (85.7% and 83.8%) and CYT b5 (75.5% and 73.5%) activities, respectively, than in groups treated with QN or HF alone. This was accompanied with more reduction in female (89.0% and 79.3%), total worms (81.4% and 70.3%), and eggs burden (hepatic; 83.8%, 66.0% and intestinal; 68%, 64.5%), respectively, and encountering the granulomatous reaction to parasite eggs trapped in the liver.[3] CYP24A1 inhibitor enhances antiproliferative effects, increases systemic calcitriol exposure, and promotes the activation of caspase-independent apoptosis pathway.[4]
Arasertaconazole is a potent 14α-lanosterol demethylase inhibitor. Arasertaconazole has antifungal and antibacterial activity[1].
Quinidine sulfate dihydrate is a potent and selective inhibitor of cytochrome P450db and inhibits amphetamine metabolism in vivo[1]. Quinidine sulfate dihydrate enhances the cytotoxicity of vincristine (VCR) in tumor cells and especially in VCR-resistant sublines of P388 leukemia (P388/VCR) and human myelogenous leukemia[2].
K777 is a potent, orally active and irreversible cysteine protease inhibitor. K777 is also a potent CYP3A4 inhibitor with an IC50 of 60 nM and a selective CCR4 antagonist featuring the potent chemotaxis inhibition. K777 irreversibly inhibits Cruzain, the major cysteine protease of Trypansoma cruzi, and cathepsins B and L. K777 is a broad-spectrum antiviral by targeting cathepsin-mediated cell entry. K777 inhibits SARS-CoV and EBOV pseudovirus entry with IC50 values of 0.68 nM and 0.87 nM, respectively[1][2][3].
Abiraterone is a potent, selective, and irreversible CYP17 inhibitor with IC50 of 2 to 4 nM.
PC945 is a novel broad spectrum antifungal agent that potently inhibits Aspergillus fumigatus sterol 14α-demethylase (CYP51A and CYP51B) with IC50 of 0.23 and 0.22 uM, respectively; shows MIC values 0.032 to >8 ug/ml against 96 clinically isolated A. fumigatus strains, demonstrates activity against itraconazole-susceptible and -resistant A. fumigatus growth with IC50 of 0.0012 to 0.034 ug/ml; PC945 is a broad spectrum of pathogenic fungi with MIC 0.0078 to 2 ug/ml, and exhibits activity in vivo. Fungal Infection Phase 1 Clinical
Nicotelline (Nicotellin) is a nicotine-related alkaloid, as well as a weak inhibitor of human cDNA-expressed cytochrome P-450 2A6 (CYP2A6). CYP2A6 mediates coumarin 7-hydroxylation, while Nicotelline fails to exhibit inhibition at 300 μM. Nicotelline can be used as a tracer and biomarker of particulate matter (PM) derived from tobacco smoke[1][2].
Furafylline is a potent and selective inhibitor of human cytochrome P450IA2 with an IC50 of 0.07 μM.
Dronedarone D6 hydrochloride is the deuterium labeled Dronedarone. Dronedarone hydrochloride, a derivative of Amiodarone (HY-14187), is a class III antiarrhythmic agent for the study of atrial fibrillation (AF) and atrial flutter. Dronedarone hydrochloride is a potent blocker of multiple ion currents, including potassium current, sodium current, and L-type calcium current, and exhibits antiadrenergic effects by noncompetitive binding to β-adrenergic receptors. Dronedarone hydrochloride is a substrate for and a moderate inhibitor of CYP3A4[1][2][3][4].
CYP4A11/CYP4F2-IN-2 (compound 15) is an orally available inhibitor of CYP4A11/4F2 with IC50s of 120 nM and 220 nM, respectively. CYP4A11/CYP4F2-IN-2 inhibits 20-HETE production in rat kidney and has potential inhibitory effects on diabetic nephropathy and autosomal dominant polycystic kidney disease[1].
Salvianolic acid C is a noncompetitive Cytochrome P4502C8 (CYP2C8) inhibitor and a moderate mixed inhibitor of Cytochrome P45022J2 (CYP2J2), with Kis of 4.82 μM and 5.75 μM for CYP2C8 and CYP2J2, respectively.
Quinidine is an antiarrhythmic agent. Quinidine is a potent, orally active, selective cytochrome P450db inhibitor. Quinidine is also a K+ channel blocker with an IC50 of 19.9 μM. Quinidine can be used for malaria research[1][2][3].
Aschantin, a bisepoxylignan, can be isolated from Magnolia biondii. Aschantin has antiplasmodial, Ca2+-antagonistic, platelet activating factor-antagonistic, and chemopreventive activities. Aschantin is a mTOR kinase inhibitor. Aschantin is also an inhibitor of Cytochrome P450 and UGT enzyme[1][2].
5,7-Dimethoxyflavone is one of the major components of Kaempferia parviflora, has anti-obesity, anti-inflammatory, and antineoplastic effects. 5,7-Dimethoxyflavone inhibits cytochrome P450 (CYP) 3As. 5,7-Dimethoxyflavone is also a potent Breast Cancer Resistance Protein (BCRP) inhibitor[1][2].
Doxepin D3 Hydrochloride is a deuterium labeled Doxepin Hydrochloride. Doxepin hydrochloride is an orally active tricyclic antidepressant used as a sedative. Doxepin hydrochloride is a potent and selective histamine receptor H1 antagonist. Doxepin hydrochloride is also a potent CYP450 inhibitor and significantly inhibits CYP450 2C19 and 1A2[1][2].
Olivetol is a naturally phenol found in lichens and produced by certain insects, acting as a competitive inhibitor of the cannabinoid receptors CB1 and CB2[3]. Olivetol also inhibits CYP2C19 and CYP2D6 activity, with IC50s of 15.3 μM, 7.21 μM and Kis of 2.71 μM, 2.87 μM, respectively[1][2].
Isosilybin (Isosilybinin) is a flavonoid from milk thistle; inhibits CYP3A4 induction with an IC50 of 74 μM.
Pregnenolone 16α-carbonitrile is an orally active prototypical and effective rodent-PXR activator. Pregnenolone 16α-carbonitrile, a synthetic steroid, induces cytochrome P4503A expression. Pregnenolone 16α-carbonitrile exhibits increased resistance to subsequent stressful insults[1][2][3].
CYP3cide (PF-4981517) is a potent, selective and time-dependent inhibitor of cytochrome P4503A4 (CYP3A4). The IC50 values for Midazolam 1’-hydroxylase activity are 0.03 μM, 17 μM, and 71 μM for CYP3A4, CYP3A5, and CYP3A7, respectively. CYP3cide can be used to distinguish the contributions of CYP3A4 versus CYP3A5 on drug metabolism[1].
Roquefortine C, a fungal cyclopeptide isolated from Penicillium roquefortii, activates P-gp and also inhibits P450-3A and other haemoproteins. Roquefortine C has bacteriostatic activities against Gram-positive bacteria[1].
Antihistamine-1 is a H1-antihistamine (Ki=6.9 nM) with acceptable blood-brain barrier penetration and also an inhibitor of CYP2D6 and hERG channel with IC50s of 5.4 and 0.8 μM, respectively.
7-Ethoxyresorufin-d5 is deuterium labeled 7-Ethoxyresorufin. 7-Ethoxyresorufin (Resorufin ethyl ether) is a fluorometric substrate and competitive inhibitor of cytochrome P450, especially CYP1A1. 7-Ethoxyresorufin also inhibits NO synthase[1][2].
Carbosulfan inhibited relatively potently CYP3A4 and moderately CYP1A1/2 and CYP2C19 in pooled HLM (human livers). Carbosulfan activation is predominantly catalyzed in humans by CYP3A4.