Diosmin is a flavonoid found in a variety of citrus fruits and also an agonist of the aryl hydrocarbon receptor (AhR).
Loureirin A is a flavonoid extracted from Dragon's Blood, can inhibit Akt phosphorylation, and has antiplatelet activity.
Neobavaisoflavone, an isoflavone isolated from Psoralea corylifolia, has striking anti-inflammatory and anti-cancer effects. IC50 value: 42.93 μM (toward CCRF-CEM cells); 114.64 μM [against HCT116 (p53(+/+)) cells] [2]Target:In vitro: In the cancer cells, neobavaisoflavone sensitizes human U373MG glioma cells to TRAIL-mediated apoptosis; upregulated DR5 expression; induced TRAIL-mediated apoptosis in human glioma cells by suppressing migration and invasion, and by inhibiting anoikis resistance [1]. In caner cell lines, neobavaisoflavone is selectively active, and IC50 values below 115 μM were obtained on 6/9 cell lines, with values ranging from 42.93 μM (toward CCRF-CEM cells) to 114.64 μM [against HCT116 (p53(+/+)) cells] [2]. In vivo:
Baohuoside I, a flavonoid isolated from Epimedium koreanum Nakai, acts as an inhibitor of CXCR4, downregulates CXCR4 expression, induces apoptosis and shows anti-tumor activity.
Dihydromyricetin is a potent inhibitor with an IC50 of 48 μM on dihydropyrimidinase. Dihydromyricetin can activate autophagy through inhibiting mTOR signaling. Dihydromyricetin suppresses the formation of mTOR complexes (mTORC1/2).
Xanthohumol is one of the principal flavonoids isolated from hops, the inhibitor of diacylglycerol acetyltransferase (DGAT), COX-1 and COX-2, and shows anti-cancer and anti-angiogenic activities.
Cirsiliol is a potent and selective 5-lipoxygenase inhibitor and a competitive low affinity benzodiazepine receptor ligand.
Kuwanon A is a flavone derivative isolated from the root barks of the mulberry tree (Morus alba L.); inhibits nitric oxide production with an IC50 of 10.5 μM.
Procyanidin B1 is a polyphenolic flavonoid isolated from commonly eaten fruits, binds to TLR4/MD-2 complex, and has anti-inflammatory activity.
Tectochrysin (Techtochrysin) is one of the major flavonoids of Alpinia oxyphylla Miquel. Tectochrysin (Techtochrysin) inhibits activity of NF-κB.
Epmedin C, a natural product, has estrogen-like effects for ovariectomized mice.IC50 value:Target:In vitro:In vivo: Anesthetized with 0.4%pentobarbital sodium, mice of the ovariectomized group were conducted with Bilateral oophorectomy, while fat beside ovaries were removed on mice of the sham-operation group. Compared with the sham-operation group, body weight of mice of model group were significantly increased, uterus weight and uterine factor and estradiol levels were significantly reduced, which suggested a significant difference. In comparison of the ovariectomized group, body weight of mice were relieved significantly and uterus weight and uterine factor and estradiol levels were increased significantly in all Epmedin C groups [1].
Calycosin-7-O-β-D-glucoside, a melanin biosynthesis inhibitor, is isolated from the methanol extract of astragalus. IC50 value: 68 μM in inhibition of Tyrosinase Target:In vitro: Calycosin-7-O-β-d-glucoside showed a melanin biosynthesis inhibition zone in a culture plate of Streptomyces bikiniensis. Furthermore, 75.78 μM of calycosin-7-O-β-d-glucoside dramatically decreased 50% of the melanin content on Melan-a cells without any apparent cytotoxicity [1]. Calycosin-7-O-β-D-glucoside was revealed to scavenge NO, inhibit the activities of MMP-2 and MMP-9, and attenuate cell death in the in vitro cultured brain microvascular endothelial cells under OGD condition.In vivo: Calycosin-7-O-β-D-glucoside treatment significantly reduced infarct volume, histological damage and blood–brain barrier permeability in the in vivo MCAO ischemia–reperfusion rat model [2]. To reveal its physiological functions under stress, seedlings with different isoflavonoid levels were established using a phenylalanine ammonia lyase (PAL) enzyme inhibitor, l-α-aminooxy-β-phenylpropionic acid (AOPP). The results showed that the significant promotion of antioxidant capacity in this species might be associated with the remarkable accumulation of Calycosin-7-O-β-D-glucoside after cold pretreatment. The results provided the first evidence that a type of isoflavonoid, Calycosin-7-O-β-D-glucoside, might play a very important role against freezing stress in vivo [3].
Casticin is a methyoxylated flavonol isolated from Viticis Fructus, with antimitotic and anti-inflammatory effect. Casticin inhibits the activation of STAT3.
Syringaldehyde is a polyphenolic compound belonging to the group of flavonoids and is found in different plant species like Manihot esculenta and Magnolia officinalis[1]. Syringaldehyde moderately inhibits COX-2 activity with an IC50 of 3.5 μg/mL[2]. Anti-hyperglycemic and anti-inflammatory activities[1].
Homoplantaginin is a flavonoid from a traditional Chinese medicine Salvia plebeia with antiinflammatory and antioxidant properties. Homoplantaginin could inhibit TNF-α and IL-6 mRNA expression, IKKβ and NF-κB phosphorylation.
Bavachin, a flavonoid first isolated from seeds of P. corylifolia, acts as a phytoestrogen that activates the estrogen receptors ERα and ERβ with EC50s of 320 and 680 nM, respectively.
Kaempferitrin is a natural flavonoid, possesses antinociceptive, anti-inflammatory, anti-diabetic, antitumoral and chemopreventive effects, and activates insulin signaling pathway.
Tangeretin, a flavonoid from citrus fruit peels, has been proven to play an important role in anti-inflammatory responses and neuroprotective effects in several disease models, and was also selected as a Notch-1 inhibitor.IC50 value:Target: Notch-1In vitro: Tangeretin enhanced the radiosensitivity of GC cells as demonstrated by MTT and colony formation assays. Tangeretin also attenuated radiation-induced EMT, invasion and migration in GC cells, accompanied by a decrease in Notch-1, Jagged1/2, Hey-1 and Hes-1 expressions. Tangeretin triggered the upregulation of miR-410, a tumor-suppressive microRNA. Furthermore, re-expression of miR-410 prevented radiation-induced EMT and cell invasion [1]. In vivo: In this study, we investigated the in vivo anti-RSV activity of tangeretin in 3-week-old male BALB/c mice. A plaque reduction assay and fluorescence quantitative polymerase chain reaction (FQ-PCR) showed that tangeretin inhibited RSV replication in the lung of mice [2].
Mulberrin is a strong inhibitor of organic anion-transporting polypeptide 2B1 (OATP2B1)-mediated estrone-3-sulfate (E3S) uptake with an IC50 value being 1.8 ±1.5 μM.
Luteolin 7-O-glucuronide could inhibit Matrix Metalloproteinases (MMP) activities, with IC50s of 17.63, 7.99, 11.42, 12.85, 0.03 μM for MMP-1, MMP-3, MMP-8, MMP-9, MMP-13, respectively.
Sophoflavescenol is a prenylated flavonol, which shows great inhibitory activity with IC50 of 0.013 μM against Phosphodiesterase 5 (PDE5), and also inhibits RLAR, HRAR, AGE, BACE1, AChE and BChE with IC50s of 0.30 µM, 0.17 µM, 17.89 µg/mL, 10.98 µM, 8.37 µM and 8.21 µM, respectively.
Astilbin, a flavonoid compound, is isolated from the rhizome of Smilax glabra. Astilbin enhances NRF2 activation. Astilbin also suppresses TNF-α expression and NF-κB activation.
Genistein, a soy isoflavone, is a multiple tyrosine kinases inhibitor which acts as a chemotherapeutic agent against different types of cancer, mainly by altering apoptosis, the cell cycle, and angiogenesis and inhibiting metastasis.
Hesperidin (HP) is a bioflavonoid that plays a role in plant defense and is abundant in citrus species, such as grapefruit, lemon and orange. Hesperidin is used effectively as a supplemental agent in complementary therapy protocols, since it possesses biological and pharmacological properties as an effective antioxidant, anti-inflammatory, anti-carcinogenic, and anti-hypertensive agent with lipid-lowering activity[1]IC50: hesperidin (IC50=116.68μmo/L))[4]in vitro: hesperidin and linarin are two of the main constituent of Valeriana's extract exhibiting a high affinity to KATP channel, which are related to the control of Ca++ concentration and release of GABA in synaptic nerve terminal, mainly on cells of SN[2]in vivo: Hesperidin was dissolved in 1% carboxymethyl cellulose (CMC) and administered orally at a dose of 50 mg/kg for 10 consecutive days. In the control group, rats were treated with the corn oil and 1% CMC vehicle.[1]
Phlorizin is a non-selective SGLT inhibitor with Kis of 300 and 39 nM for hSGLT1 and hSGLT2, respectively. Phlorizin is also a Na+/K+-ATPase inhibitor.
Licochalcone C could inhibit α-glucosidase, with IC50s of <100 nM and 92.43 μM for α-glucosidase and protein tyrosine phosphatase 1B (PTP1B), respectively.
Tectorigenin is a plant isoflavonoid originally isolated from the dried flower of Pueraria thomsonii Benth.
Liquiritigenin, a flavanone isolated from Glycyrrhiza uralensis, is a highly selective estrogen receptor β (ERβ) agonist with an EC50 of 36.5 nM for activation of the ERE tk-Luc.
Bavachinin(7-O-Methylbavachin) is a natural compound isolated from the Chinese herb Fructus Psoraleae;has potent anti-angiogenic activity.IC50 value:Target:in vitro: Isobavachalcone significantly inhibits both oligomerization and fibrillization of Aβ42, whereas bavachinin inhibits fibrillization and leads to off-pathway aggregation. Both of the compounds attenuated Aβ42-induced toxicity in a SH-SY5Y cell model [1]. Bavachinin, has potent anti-angiogenic activity in vitro and in vivo. Bavachinin inhibited increases in HIF-1α activity in human KB carcinoma (HeLa cell derivative) and human HOS osteosarcoma cells under hypoxia in a concentration-dependent manner, probably by enhancing the interaction between von Hippel-Lindau (VHL) and HIF-1α [2].in vivo: significantly inhibited Th2 cytokine production, including IL-4, IL-5 and IL-13. Notably, this compound almost completely blocked inflammation in the ovalbumin (OVA)-sensitized animal asthma model [3].
Cardamonin is a novel antagonist of hTRPA1 cation channel with an IC50 of 454 nM.