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Sakao K, Saruwatari H, Minami S, Hou DX. Hydroxyl Group Acetylation of Quercetin Enhances Intracellular Absorption and Persistence to Upregulate Anticancer Activity in HepG2 Cells. Int J Mol Sci 2023; 24:16652. [PMID: 38068974 PMCID: PMC10706045 DOI: 10.3390/ijms242316652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/19/2023] [Accepted: 11/20/2023] [Indexed: 12/18/2023] Open
Abstract
Quercetin, a flavonoid compound widely distributed in many plants, is known to have potent antitumor effects on several cancer cells. Our previous study revealed that the acetylation of quercetin enhanced its antitumor effect. However, the mechanisms remain unknown. This study aimed to elucidate the bioavailability of acylated quercetin in the HepG2 cell model based on its antitumor effect. The positions of quercetin 3,7,3',4'-OH were acetylated as 3,7,3',4'-O-tetraacetylquercetin (4Ac-Q). The inhibitory effect of 4Ac-Q on HepG2 cell proliferation was assessed by measuring cell viability. The apoptosis was characterized by apoptotic proteins and mitochondrial membrane potential shifts, as well as mitochondrial reactive oxygen species (ROS) levels. The bioavailability of 4Ac-Q was analyzed by measuring the uptake and metabolites in HepG2 cells with high performance liquid chromatography (HPLC)-photodiode array detector (PDA) and-ultraviolet/visible detector (UV/Vis). The results revealed that 4Ac-Q enhanced the inhibitory effect on HepG2 cell proliferation and induced its apoptosis significantly higher than quercetin. Protein array analysis of apoptosis-related protein indicated that 4Ac-Q increased the activation or expression of pro-apoptotic proteins, including caspase-3, -9, as well as second mitochondria-derived activator of caspases (SMAC), and suppressed the expression of apoptosis inhibiting proteins such as cellular inhibitor of apoptosis (cIAP)-1, -2, Livin, Survivin, and X-linked inhibitor of apoptosis (XIAP). Furthermore, 4Ac-Q stimulated mitochondrial cytochrome c release into the cytosol by enhancing ROS level and depolarizing the mitochondrial membrane. Finally, the analysis of uptake and metabolites of 4Ac-Q in HpG2 cells with HPLC-PDA and -UV/Vis revealed that 4Ac-Q was metabolized to quercetin and several different acetylated quercetins which caused 2.5-fold higher quercetin present in HepG2 cells than parent quercetin. These data demonstrated that acetylation of the quercetin hydroxyl group significantly increased its intracellular absorption. Taken together, our findings provide the first evidence that acetyl modification of quercetin not only substantially augments the intracellular absorption of quercetin but also bolsters its metabolic stability to elongate its intracellular persistence. Therefore, acetylation could serve as a strategic approach to enhance the ability of quercetin and analogous flavonoids to suppress cancer cell proliferation.
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Affiliation(s)
- Kozue Sakao
- The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0065, Japan;
- Department of Food Science and Biotechnology, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan; (H.S.); (S.M.)
| | - Hanako Saruwatari
- Department of Food Science and Biotechnology, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan; (H.S.); (S.M.)
| | - Shohei Minami
- Department of Food Science and Biotechnology, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan; (H.S.); (S.M.)
| | - De-Xing Hou
- The United Graduate School of Agricultural Sciences, Kagoshima University, Kagoshima 890-0065, Japan;
- Department of Food Science and Biotechnology, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan; (H.S.); (S.M.)
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Hofmann J, Spatz P, Walther R, Gutmann M, Maurice T, Decker M. Synthesis and Biological Evaluation of Flavonoid‐Cinnamic Acid Amide Hybrids with Distinct Activity against Neurodegeneration in Vitro and in Vivo. Chemistry 2022; 28:e202200786. [PMID: 35621167 PMCID: PMC9400986 DOI: 10.1002/chem.202200786] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Indexed: 11/10/2022]
Abstract
Flavonoids are polyphenolic natural products and have shown significant potential as disease‐modifying agents against neurodegenerative disorders like Alzheimer's disease (AD), with activities even in vivo. Hybridization of the natural products taxifolin and silibinin with cinnamic acid led to an overadditive effect of these compounds in several phenotypic screening assays related to neurodegeneration and AD. Therefore, we have exchanged the flavonoid part of the hybrids with different flavonoids, which show higher efficacy than taxifolin or silibinin, to improve the activity of the respective hybrids. Chemical connection between the flavonoid and cinnamic acid was realized by an amide instead of a labile ester bond to improve stability towards hydrolysis. To investigate the influence of a double bond at the C‐ring of the flavonoid, the dehydro analogues of the respective hybrids were also synthesized. All compounds obtained show neuroprotection against oxytosis, ferroptosis and ATP‐depletion, respectively, in the murine hippocampal cell line HT22. Interestingly, the taxifolin and the quercetin derivatives are the most active compounds, whereby the quercetin derivate shows even more pronounced activity than the taxifolin one in all assays applied. As aimed for, no hydrolysis product was found in cellular uptake experiments after 4 h whereas different metabolites were detected. Furthermore, the quercetin‐cinnamic acid amide showed pronounced activity in an in vivo AD mouse model at a remarkably low dose of 0.3 mg/kg.
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Affiliation(s)
- Julian Hofmann
- Pharmaceutical and Medicinal Chemistry Institute of Pharmacy and Food Chemistry University of Würzburg Am Hubland 97074 Würzburg Germany
| | - Philipp Spatz
- Pharmaceutical and Medicinal Chemistry Institute of Pharmacy and Food Chemistry University of Würzburg Am Hubland 97074 Würzburg Germany
| | - Rasmus Walther
- Pharmaceutical and Medicinal Chemistry Institute of Pharmacy and Food Chemistry University of Würzburg Am Hubland 97074 Würzburg Germany
| | - Marcus Gutmann
- Drug Formulation and Delivery Institute of Pharmacy and Food Chemistry University of Würzburg Am Hubland 97074 Würzburg Germany
| | - Tangui Maurice
- MMDN University of Montpellier, EPHE, INSERM 34095 Montpellier France
| | - Michael Decker
- Pharmaceutical and Medicinal Chemistry Institute of Pharmacy and Food Chemistry University of Würzburg Am Hubland 97074 Würzburg Germany
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de Alcântara Pinto DC, Pitasse-Santos P, de Souza GA, Castro RN, Freire de Lima ME. Peracetylation of polyphenols under rapid and mild reaction conditions. Nat Prod Res 2022:1-6. [PMID: 35073791 DOI: 10.1080/14786419.2022.2031186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Structural modifications are an important tool for studying the properties of naturally occurring polyphenols. Regarding the preparation of acetyl esters, the presence of hydroxyl groups stabilized by intramolecular hydrogen bonds may pose an obstacle for the peracetylation of these compounds. In this paper, we present a facile protocol for the acetylation of selected polyphenols under mild reaction conditions by using acetic anhydride, catalytic amount 4-dimethylaminopyridine (DMAP) and dimethylformamide (DMF) as solvent. Reaction conditions were adjusted for optimal formation of peracetylated polyphenols while minimizing the formation of byproducts. Butyric anhydride was employed as an alternative acylating agent and showed similar results. Reaction yields varied from 78-97%, and products were obtained in high purity, as determined by LCMS(ESI+), 1H NMR and 13C NMR.
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Affiliation(s)
| | - Paulo Pitasse-Santos
- Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
| | | | - Rosane Nora Castro
- Instituto de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil
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An HJ, Yoon YK, Lee JD, Jeong NH. Antioxidant and antimicrobial properties of dihydroquercetin esters. BRAZ J PHARM SCI 2022. [DOI: 10.1590/s2175-97902022e190800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Hyun-Jin An
- Chungbuk National University, Korea; Yeomyung Biochem Co., Ltd., Korea
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da Silva SVS, Barboza OM, Souza JT, Soares ÉN, dos Santos CC, Pacheco LV, Santos IP, Magalhães TBDS, Soares MBP, Guimarães ET, Meira CS, Costa SL, da Silva VDA, de Santana LLB, de Freitas Santos Júnior A. Structural Design, Synthesis and Antioxidant, Antileishmania, Anti-Inflammatory and Anticancer Activities of a Novel Quercetin Acetylated Derivative. Molecules 2021; 26:molecules26226923. [PMID: 34834016 PMCID: PMC8623808 DOI: 10.3390/molecules26226923] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/12/2021] [Accepted: 11/14/2021] [Indexed: 02/01/2023] Open
Abstract
Quercetin (Q) is a bioflavonoid with biological potential; however, poor solubility in water, extensive enzymatic metabolism and a reduced bioavailability limit its biopharmacological use. The aim of this study was to perform structural modification in Q by acetylation, thus, obtaining the quercetin pentaacetate (Q5) analogue, in order to investigate the biological potentials (antioxidant, antileishmania, anti-inflammatory and cytotoxicity activities) in cell cultures. Q5 was characterized by FTIR, 1H and 13C NMR spectra. The antioxidant potential was evaluated against the radical ABTS•+. The anti-inflammatory potential was evaluated by measuring the pro-inflammatory cytokine tumor necrosis factor (TNF) and the production of nitric oxide (NO) in peritoneal macrophages from BALB/c mice. Cytotoxicity tests were performed using the AlamarBlue method in cancer cells HepG2 (human hepatocarcinoma), HL-60 (promyelocytic leukemia) and MCR-5 (healthy human lung fibroblasts) as well as the MTT method for C6 cell cultures (rat glioma). Q and Q5 showed antioxidant activity of 29% and 18%, respectively, which is justified by the replacement of hydroxyls by acetyl groups. Q and Q5 showed concentration-dependent reductions in NO and TNF production (p < 0.05); Q and Q5 showed higher activity at concentrations > 40µM when compared to dexamethasone (20 µM). For the HL-60 lineage, Q5 demonstrated selectivity, inducing death in cancer cells, when compared to the healthy cell line MRC-5 (IC50 > 80 µM). Finally, the cytotoxic superiority of Q5 was verified (IC50 = 11 µM), which, at 50 µM for 24 h, induced changes in the morphology of C6 glioma cells characterized by a round body shape (not yet reported in the literature). The analogue Q5 had potential biological effects and may be promising for further investigations against other cell cultures, particularly neural ones.
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Affiliation(s)
- Saul Vislei Simões da Silva
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
| | - Orlando Maia Barboza
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
| | - Jéssica Teles Souza
- Laboratory of Neurochemistry and Cell Biology, Department of Biochemistry and Biophysics, Federal University of Bahia, Salvador 40231-300, BA, Brazil; (J.T.S.); (É.N.S.); (C.C.d.S.); (S.L.C.); (V.D.A.d.S.)
| | - Érica Novaes Soares
- Laboratory of Neurochemistry and Cell Biology, Department of Biochemistry and Biophysics, Federal University of Bahia, Salvador 40231-300, BA, Brazil; (J.T.S.); (É.N.S.); (C.C.d.S.); (S.L.C.); (V.D.A.d.S.)
| | - Cleonice Creusa dos Santos
- Laboratory of Neurochemistry and Cell Biology, Department of Biochemistry and Biophysics, Federal University of Bahia, Salvador 40231-300, BA, Brazil; (J.T.S.); (É.N.S.); (C.C.d.S.); (S.L.C.); (V.D.A.d.S.)
| | - Luciano Vasconcellos Pacheco
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
- Gonçalo Moniz Institute, FIOCRUZ, Salvador 40296-710, BA, Brazil; (I.P.S.); (M.B.P.S.)
| | | | - Tatiana Barbosa dos Santos Magalhães
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
| | - Milena Botelho Pereira Soares
- Gonçalo Moniz Institute, FIOCRUZ, Salvador 40296-710, BA, Brazil; (I.P.S.); (M.B.P.S.)
- SENAI Institute of Innovation in Health Advanced Systems (CIMATEC ISI SAS), University Center SENAI/CIMATEC, Salvador 41650-010, BA, Brazil
| | - Elisalva Teixeira Guimarães
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
- Gonçalo Moniz Institute, FIOCRUZ, Salvador 40296-710, BA, Brazil; (I.P.S.); (M.B.P.S.)
| | - Cássio Santana Meira
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
- Gonçalo Moniz Institute, FIOCRUZ, Salvador 40296-710, BA, Brazil; (I.P.S.); (M.B.P.S.)
- SENAI Institute of Innovation in Health Advanced Systems (CIMATEC ISI SAS), University Center SENAI/CIMATEC, Salvador 41650-010, BA, Brazil
| | - Silvia Lima Costa
- Laboratory of Neurochemistry and Cell Biology, Department of Biochemistry and Biophysics, Federal University of Bahia, Salvador 40231-300, BA, Brazil; (J.T.S.); (É.N.S.); (C.C.d.S.); (S.L.C.); (V.D.A.d.S.)
| | - Victor Diógenes Amaral da Silva
- Laboratory of Neurochemistry and Cell Biology, Department of Biochemistry and Biophysics, Federal University of Bahia, Salvador 40231-300, BA, Brazil; (J.T.S.); (É.N.S.); (C.C.d.S.); (S.L.C.); (V.D.A.d.S.)
| | - Lourenço Luís Botelho de Santana
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
| | - Aníbal de Freitas Santos Júnior
- Department of Life Sciences, State University of Bahia (UNEB), Salvador 41150-000, BA, Brazil; (S.V.S.d.S.); (O.M.B.); (L.V.P.); (T.B.d.S.M.); (E.T.G.); (C.S.M.); (L.L.B.d.S.)
- Correspondence: or ; Tel.: +55-71-3117-5313
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Biasutto L, Mattarei A, Paradisi C. Synthesis and Testing of Novel Isomeric Mitochondriotropic Derivatives of Resveratrol and Quercetin. Methods Mol Biol 2021; 2275:141-160. [PMID: 34118036 DOI: 10.1007/978-1-0716-1262-0_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Resveratrol and quercetin are among the most studied plant polyphenols, and have many health-promoting actions. Strategies to accumulate them into mitochondria may be of therapeutic relevance, since these compounds are redox active and are well known to impact mitochondria and mitochondrial proteins. We report here the procedures to synthesize mitochondria-targeted resveratrol and quercetin derivatives; the synthetic strategies reported are however expected to be adaptable to other polyphenols with similar reactivity at the phenolic hydroxyls. Mitochondrial targeting can be achieved by conjugation with triphenylphosphonium , a lipophilic cation; this was linked via a butyl spacer forming an ether bond with one of the phenolic oxygens. The first step toward the synthesis of all mitochondriotropic derivatives described in this work is the production of a regiospecific -(4-O-chlorobutyl) derivative. Triphenylphosphonium (P+Ph3I-) is then introduced through two consecutive nucleophilic substitution steps: -Cl → -I → -P+Ph3I-. Pure mono-substituted chlorobutyl regioisomers are obtained by purification from the reaction mixture in the case of resveratrol , while specific protection strategies are required for quercetin to favor alkylation of one specific hydroxyl.Functionalization of the remaining hydroxyls can be exploited to modulate the physicochemical properties of the derivatives (i.e., water solubility, affinity for cell membranes); we report here synthetic protocols to obtain acetylated and methylated analogs.A brief description of some methods to assess the accumulation of the derivatives in mitochondria is also given; the proposed techniques are the use of a TPP +-selective electrode (with isolated rat liver mitochondria ) and fluorescence microscopy (with cultured cells).
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Affiliation(s)
- Lucia Biasutto
- CNR Institute of Neurosciences, Padova, Italy. .,Department of Biomedical Sciences, University of Padova, Padova, Italy.
| | - Andrea Mattarei
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Padova, Italy
| | - Cristina Paradisi
- Department of Chemical Sciences, University of Padova, Padova, Italy
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Abstract
Fatty acids and polyphenols represent different classes of pharmacologically active molecules. Hybrid derivatives of these compounds are interesting therapeutic tools. They could be obtained using enzymatic approaches, which allow regioselective derivatizations. In this short note, the pancreatic porcine lipase was employed to mediate the regioselective synthesis of 7-docosahexaenoyl-quercetin was described. The C-7 regioisomer formation was confirmed by 1H-NMR experiment. Generally, in this approach the alcoholic OH- was preferred when present. Nevertheless, in this case, it was demonstrated that the hindrance of the acyl group is a variable to obtain a good regioselectivity in C-7 position, employing only one-step reaction.
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Cyanidin-3-glucoside Lipophilic Conjugates for Topical Application: Tuning the Antimicrobial Activities with Fatty Acid Chain Length. Processes (Basel) 2021. [DOI: 10.3390/pr9020340] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Background: Natural anthocyanins present a low solubility in lipophilic media, which compromises their effective application in lipophilic systems. In this work, cyanidin-3-O-glucoside (Cy3glc) was esterified by the addition of fatty acids with increasing chain-lengths and a structure-activity relationship was performed towards the description of the best analog for skin-care applications. Methods: By enzymatic hemi-synthesis, it was possible to obtain 5 structurally related derivatives of cyanidin-3-O-glucoside with successive C2 increments in the aliphatic chain. The stability in hanks buffer and DMEM with or without FBS was followed by HPLC. The cytotoxicity against keratinocytes was evaluated by MTT assay. The antioxidant capacity was determined by using the fluorescent probe DCF-DA. The effect on enzyme activity was evaluated towards tyrosinase, collagenase, and elastase enzymes by colorimetric assays. MIC and MBC values were obtained against reference strains and against multidrug-resistant isolates. Results: In physiological conditions, cy3glc−fatty acid derivatives are more stable and may be converted to the native anthocyanin. The 5 conjugates showed lower antioxidant capacity and enzymatic inhibitory activities in comparison to the anthocyanin precursor. However, concerning the antibacterial activity, the insertion of a fatty acid chain sprouted the antibacterial activity, showing a clear biphasic effect and a more effective effect on Gram-positive bacteria. Conclusions: Cy3glc-C10 was the most effective compound considering the antimicrobial activity, although a general reduction was observed among the other activities evaluated. This work prompt further assays with a different panoply of derivatives ranging other features including saturation vs. unsaturation, even vs. odd carbon content and linear vs. branched.
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A multitarget semi-synthetic derivative of the flavonoid morin with improved in vitro vasorelaxant activity: Role of Ca V1.2 and K Ca1.1 channels. Biochem Pharmacol 2021; 185:114429. [PMID: 33513341 DOI: 10.1016/j.bcp.2021.114429] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 12/28/2020] [Accepted: 01/19/2021] [Indexed: 12/24/2022]
Abstract
CaV1.2 channels play a fundamental role in the regulation of vascular smooth muscle tone. The aim of the present study was to synthesize morin derivatives bearing the nitrophenyl moiety of dihydropyridine Ca2+ antagonists to increase the flavonoid vasorelaxant activity. The effects of morin and its derivatives were assessed on CaV1.2 and KCa1.1 channels, both in vitro and in silico, as well as on the contractile responses of rat aorta rings. All compounds were effective CaV1.2 channel blockers, positioning in the α1C subunit region where standard blockers bind. Among the four newly synthesized morin derivatives, the penta-acetylated morin-1 was the most efficacious Ca2+ antagonist, presenting a vasorelaxant profile superior to that of the parent compound and, contrary to morin, antagonized also the release of Ca2+ from the sarcoplasmic reticulum; surprisingly, it also stimulated KCa1.1 channel current. Computational analysis demonstrated that morin-1 bound close to the KCa1.1 channel S6 segment. In conclusion, these findings open a new avenue for the synthesis of valuable multi-functional, vasorelaxant morin derivatives capable to target several pathways underpinning the pathogenesis of hypertension.
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Carullo G, Ahmed A, Trezza A, Spiga O, Brizzi A, Saponara S, Fusi F, Aiello F. Design, synthesis and pharmacological evaluation of ester-based quercetin derivatives as selective vascular K Ca1.1 channel stimulators. Bioorg Chem 2020; 105:104404. [PMID: 33142229 DOI: 10.1016/j.bioorg.2020.104404] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 10/08/2020] [Accepted: 10/19/2020] [Indexed: 12/27/2022]
Abstract
Quercetin represents one of the most studied dietary flavonoids; it exerts a panel of pharmacological activities particularly on the cardiovascular system. Stimulation of vascular KCa1.1 channels contributes to its vasorelaxant activity, which is, however, counteracted in part by its concomitant stimulation of CaV1.2 channels. Therefore, several quercetin hybrid derivatives were designed and synthesized to produce a more selective KCa1.1 channel stimulator, then assessed both in silico and in vitro. All the derivatives interacted with the KCa1.1 channel with similar binding energy values. Among the selected derivatives, 1E was a weak vasodilator, though displaying an interesting CaV1.2 channel blocking activity. The lipoyl derivatives 1F and 3F, though showing pharmacological and electrophysiological features similar to those of quercetin, seemed to be more effective as KCa1.1 channel stimulators as compared to the parent compound. The strategy pursued demonstrated how different chemical substituents on the quercetin core can change/invert its effect on CaV1.2 channels or enhance its KCa1.1 channel stimulatory activity, thus opening new avenues for the synthesis of efficacious vasorelaxant quercetin hybrids.
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Affiliation(s)
- Gabriele Carullo
- Department of Pharmacy, Health and Nutritional Sciences, DoE 2018-2022, University of Calabria, Edificio Polifunzionale, 87036 Rende (CS), Italy; Department of Biotechnology, Chemistry and Pharmacy, DoE 2018-2022, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy
| | - Amer Ahmed
- Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy
| | - Alfonso Trezza
- Department of Biotechnology, Chemistry and Pharmacy, DoE 2018-2022, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy
| | - Ottavia Spiga
- Department of Biotechnology, Chemistry and Pharmacy, DoE 2018-2022, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy
| | - Antonella Brizzi
- Department of Biotechnology, Chemistry and Pharmacy, DoE 2018-2022, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy
| | - Simona Saponara
- Department of Life Sciences, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy.
| | - Fabio Fusi
- Department of Biotechnology, Chemistry and Pharmacy, DoE 2018-2022, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy.
| | - Francesca Aiello
- Department of Pharmacy, Health and Nutritional Sciences, DoE 2018-2022, University of Calabria, Edificio Polifunzionale, 87036 Rende (CS), Italy
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Karimova ER, Baltina LA, Spirikhin LV, Sapozhnikova TA, Gabdrakhmanova SF, Makara NS. Methylation of Quercetin by Diazomethane and Hypoglycemic Activity of its Tetra-O-Methyl Ether. Chem Nat Compd 2020. [DOI: 10.1007/s10600-020-03164-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Tiwari P, Mishra KP. Flavonoids sensitize tumor cells to radiation: molecular mechanisms and relevance to cancer radiotherapy. Int J Radiat Biol 2019; 96:360-369. [PMID: 31738629 DOI: 10.1080/09553002.2020.1694193] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Purpose: Radiobiological research continues to focus on finding newer strategies for enhanced killing of tumor cells by ionizing radiation. In recent years, chemotherapeutic drugs have been found to possess the capabilities to sensitize tumor cells without affecting the normal cells. There have been increasing research efforts to identify novel and nontoxic compounds which cause minimal or no harm to normal cells but maximize tumor toxicity response to radiation exposure. Extensive researches on flavonoids that are compounds derived from plants have shown that these have promising abilities as radioprotectors and radiosensitizers.Conclusions: In this review, we examine the role of flavonoids as potential radiosensitizers, review the underlying molecular mechanisms and discuss their potential usefulness in improving cancer radiotherapy. It is emphasized that obtaining a deeper insight into the molecular mechanisms underlying the combined action of flavonoids and ionizing radiation may provide new directions for radiobiological research applicable to the much needed enhanced selective tumor cytotoxicity to treatment agents.
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Affiliation(s)
- Prabha Tiwari
- National Institutes of Biomedical Innovation Health and Nutrition, Ibaraki, Osaka, Japan
| | - Kaushala Prasad Mishra
- Foundation for Education and Research, Ex Bhabha Atomic Research Center, Mumbai, Maharashtra, India
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7-O-Esters of taxifolin with pronounced and overadditive effects in neuroprotection, anti-neuroinflammation, and amelioration of short-term memory impairment in vivo. Redox Biol 2019; 29:101378. [PMID: 31926632 PMCID: PMC6928325 DOI: 10.1016/j.redox.2019.101378] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 11/07/2019] [Indexed: 12/20/2022] Open
Abstract
Alzheimer's disease (AD) is a multifactorial disease and the most common form of dementia. There are no treatments to cure, prevent or slow down the progression of the disease. Natural products hold considerable interest for the development of preventive neuroprotectants to treat neurodegenerative disorders like AD, due to their low toxicity and general beneficial effects on human health with their anti-inflammatory and antioxidant features. In this work we describe regioselective synthesis of 7-O-ester hybrids of the flavonoid taxifolin with the phenolic acids cinnamic and ferulic acid, namely 7-O-cinnamoyltaxifolin and 7-O-feruloyltaxifolin. The compounds show pronounced overadditive neuroprotective effects against oxytosis, ferroptosis and ATP depletion in the murine hippocampal neuron HT22 cell model. Furthermore, 7-O-cinnamoyltaxifolin and 7-O-feruloyltaxifolin reduced LPS-induced neuroinflammation in BV-2 microglia cells as assessed by effects on the levels of NO, IL6 and TNFα. In all in vitro assays the 7-O-esters of taxifolin and ferulic or cinnamic acid showed strong overadditive activity, significantly exceeding the effects of the individual components and the equimolar mixtures thereof, which were almost inactive in all of the assays at the tested concentrations. In vivo studies confirmed this overadditive effect. Treatment of an AD mouse model based on the injection of oligomerized Aβ25-35 peptide into the brain to cause neurotoxicity and subsequently memory deficits with 7-O-cinnamoyltaxifolin or 7-O-feruloyltaxifolin resulted in improved performance in an assay for short-term memory as compared to vehicle and mice treated with the respective equimolar mixtures. These results highlight the benefits of natural product hybrids as a novel compound class with potential use for drug discovery in neurodegenerative diseases due to their pharmacological profile that is distinct from the individual natural components.
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14
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Asebi N, Nihei KI. Total synthesis of apios isoflavones and investigation of their tyrosinase inhibitory activity. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Kaviarasi S, Shalini Devi KS, Vinoth P, Sridharan V, Yuba E, Harada A, Krishnan UM. Synthesis, Characterization, and Biomedical Applications of an Alkylated Quercetin-Gadolinium Complex. ACS Biomater Sci Eng 2019; 5:1215-1227. [PMID: 33405641 DOI: 10.1021/acsbiomaterials.8b01254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Flavonoids and their derivatives have been extensively studied for their pharmaceutical applications due to their antioxidant and anti-inflammatory properties. The coordination complexes of several flavonoids have demonstrated DNA binding ability that can confer anticancer properties. The structure of the flavonoid has a pronounced influence on its pharmacological properties. Herein we report the synthesis and characterization of alkylated quercetin and its complex with gadolinium. The structure of the complex was confirmed using spectroscopic techniques. The ability of the gadolinium-alkylated quercetin complex to serve as a magnetic contrast agent was compared with gadolinium-quercetin complex. The quercetin-gadolinium complex was found to exhibit better contrast property with a relaxivity of 0.2952 μg mL-1 s-1 when compared to the gadolinium complex of alkylated quercetin. This difference primarily arises due to the greater hydrophobicity of the alkylated quercetin complex that restricts access of water. However, the alkylated quercetin was found to exhibit better enzyme mimic activity as the metal ion served as a redox center that enabled quantification of hydrogen peroxide in the concentration range 50-450 μM within 5 s with a sensitivity of 64 nA/μM and limit of detection of 7.3 μM. The better sensing performance of the alkylated quercetin-gadolinium complex, reported here for the first time, when compared to quercetin-gadolinium complex can be attributed to the enhanced electroactive area on the working electrode.
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Affiliation(s)
- Sathyasivam Kaviarasi
- Centre for Nanotechnology & Advanced Biomaterials, SASTRA Deemed University, Thanjavur 613401, India.,School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur 613401, India
| | - K S Shalini Devi
- Centre for Nanotechnology & Advanced Biomaterials, SASTRA Deemed University, Thanjavur 613401, India.,School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur 613401, India
| | - Perumal Vinoth
- School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur 613401, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Jammu 181143, India
| | - Eiji Yuba
- Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Atsushi Harada
- Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Uma Maheswari Krishnan
- Centre for Nanotechnology & Advanced Biomaterials, SASTRA Deemed University, Thanjavur 613401, India.,School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur 613401, India
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16
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Abstract
Flavonoids are tricyclic polyphenolic compounds naturally occurring in plants. Being nature’s antioxidants flavonoids have been shown to reduce the damages induced by oxidative stress in cells. Besides being an antioxidant, flavonols are demonstrated to have anti-infective properties, i.e., antiviral, antifungal, anti-angiogenic, anti-tumorigenic, and immunomodulatory bioproperties. Plants use them as one of their defense mechanisms against radiation-induced DNA damage and also for fungal infections. The use of flavonols for fabrication of new drugs has been underway with objectives to develop safer and effective therapeutic agents. This review covers 15 flavonols for their structure, biological properties, role in plant metabolisms, and current research focused on computational drug design using flavonols for searching drug leads.
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17
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Del Favero G, Bialas F, Grabher S, Wittig A, Bräuer B, Gerthsen D, Echalier C, Kamalov M, Marko D, Becker CFW. Silica particles with a quercetin–R5 peptide conjugate are taken up into HT-29 cells and translocate into the nucleus. Chem Commun (Camb) 2019; 55:9649-9652. [DOI: 10.1039/c9cc02215e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Particles generated by biomimetic silica precipitation with a quercetin–R5 peptide enter the nucleus of HT-29 cells without inducing toxicity.
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18
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Bavo F, Pucci S, Fasoli F, Lammi C, Moretti M, Mucchietto V, Lattuada D, Viani P, De Palma C, Budriesi R, Corradini I, Dowell C, McIntosh JM, Clementi F, Bolchi C, Gotti C, Pallavicini M. Potent Antiglioblastoma Agents by Hybridizing the Onium-Alkyloxy-Stilbene Based Structures of an α7-nAChR, α9-nAChR Antagonist and of a Pro-Oxidant Mitocan. J Med Chem 2018; 61:10531-10544. [PMID: 30403486 DOI: 10.1021/acs.jmedchem.8b01052] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Adenocarcinoma and glioblastoma cell lines express α7- and α9α10-containing nicotinic acetylcholine receptors (nAChRs), whose activation promotes tumor cell growth. On these cells, the triethylammoniumethyl ether of 4-stilbenol MG624, a known selective antagonist of α7 and α9α10 nAChRs, has antiproliferative activity. The structural analogy of MG624 with the mitocan RDM-4'BTPI, triphenylphosphoniumbutyl ether of pterostilbene, suggested us that molecular hybridization among their three substructures (stilbenoxy residue, alkylene linker, and terminal onium) and elongation of the alkylene linker might result in novel antitumor agents with higher potency and selectivity. We found that lengthening the ethylene bridge in the triethylammonium derivatives results in more potent and selective toxicity toward adenocarcinoma and glioblastoma cells, which was paralleled by increased α7 and α9α10 nAChR antagonism and improved ability of reducing mitochondrial ATP production. Elongation of the alkylene linker was advantageous also for the triphenylphosphonium derivatives resulting in a generalized enhancement of antitumor activity, associated with increased mitotoxicity.
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Affiliation(s)
- Francesco Bavo
- Dipartimento di Scienze Farmaceutiche , Università degli Studi di Milano , Via Mangiagalli 25 , I-20133 Milano , Italy
| | - Susanna Pucci
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy.,Hunimed University , Via Rita Levi-Montalcini 4 , 20090 Pieve Emanuele (MI) , Italy
| | - Francesca Fasoli
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Carmen Lammi
- Dipartimento di Scienze Farmaceutiche , Università degli Studi di Milano , Via Mangiagalli 25 , I-20133 Milano , Italy
| | - Milena Moretti
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy.,Department of Medical Biotechnology and Translational Medicine , Università degli Studi di Milano , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Vanessa Mucchietto
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Donatella Lattuada
- Department of Medical Biotechnology and Translational Medicine , Università degli Studi di Milano , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Paola Viani
- Department of Medical Biotechnology and Translational Medicine , Università degli Studi di Milano , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Clara De Palma
- Unit of Clinical Pharmacology , University Hospital "Luigi Sacco"-ASST Fatebenefratelli Sacco , Via G. B. Grassi 74 , I-20157 Milano , Italy
| | - Roberta Budriesi
- Dipartimento di Farmacia e Biotecnologie , Università degli Studi di Bologna , Via Belmeloro 6 , I-40126 Bologna , Italy
| | - Irene Corradini
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Cheryl Dowell
- Department of Biology , University of Utah , 257S.1400 East , Salt Lake City , Utah 84112 , United States
| | - J Michael McIntosh
- Department of Biology , University of Utah , 257S.1400 East , Salt Lake City , Utah 84112 , United States.,George E. Wahlen Veterans Affairs Medical Center , 500 Foothill Drive , Salt Lake City , Utah 84148 , United States.,Department of Psychiatry , University of Utah , 501 Chipeta Way , Salt Lake City , Utah 84108 , United States
| | - Francesco Clementi
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy.,Department of Medical Biotechnology and Translational Medicine , Università degli Studi di Milano , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Cristiano Bolchi
- Dipartimento di Scienze Farmaceutiche , Università degli Studi di Milano , Via Mangiagalli 25 , I-20133 Milano , Italy
| | - Cecilia Gotti
- Institute of Neuroscience , CNR , Via Vanvitelli 32 , I-20129 Milano , Italy.,Department of Medical Biotechnology and Translational Medicine , Università degli Studi di Milano , Via Vanvitelli 32 , I-20129 Milano , Italy
| | - Marco Pallavicini
- Dipartimento di Scienze Farmaceutiche , Università degli Studi di Milano , Via Mangiagalli 25 , I-20133 Milano , Italy
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Lan L, Wang Y, Pan Z, Wang B, Yue Z, Jiang Z, Li L, Wang C, Tang H. Rhamnetin induces apoptosis in human breast cancer cells via the miR-34a/Notch-1 signaling pathway. Oncol Lett 2018; 17:676-682. [PMID: 30655816 DOI: 10.3892/ol.2018.9575] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2016] [Accepted: 03/19/2018] [Indexed: 12/19/2022] Open
Abstract
The present study aimed to investigate whether rhamnetin induced apoptosis in human breast cancer cells and the underlying molecular mechanism of this anti cancer effect. The treatment of MCF-7 cells with rhamnetin was able to significantly inhibit cell proliferation and induce caspase-3/9 activity in a dose- and time-dependent manner, compared with untreated cells. In addition, treatment with rhamnetin was able to significantly promote the expression of p53 protein and microRNA (miR-)34a compared with untreated cells. The treatment with rhamnetin also suppressed the expression of Notch1 protein in MCF-7 cells compared with untreated cells. Subsequently, miR-24a expression was promoted in rhamnetin-treated MCF-7 cells using a miR-34a plasmid. The overexpression of miR-34a was able to significantly inhibit cell viability and induce caspase-3/9 activity in MCF-7 cells following treatment with rhamnetin. Furthermore, the overexpression of miR-34a was able to significantly promote the expression of p53 protein and miR-34a, and suppress the expression of Notch1 protein in rhamnetin-treated MCF-7 cells. Therefore, the results of the present study demonstrated that rhamnetin induced apoptosis in human breast cancer cells via the miR-34a/Notch-1 signaling pathway.
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Affiliation(s)
- Lan Lan
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Yue Wang
- Department of Immunology, School of Medicine, Nankai University, Tianjin 300071, P.R. China
| | - Zhanyu Pan
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Bin Wang
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Zhensong Yue
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Zhansheng Jiang
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Ling Li
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Cong Wang
- Department of Integrated Traditional Chinese and Western Medicine, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin 300060, P.R. China
| | - Hongmei Tang
- College of Life Science, Hebei United University, Tangshan, Hebei 063000, P.R. China
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20
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Mohajeri M, Saghaei L, Ghanadian M, Saberi S, Pestechian N, Ostadhusseini E. Synthesis and In vitro Leishmanicidal Activities of Six Quercetin Derivatives. Adv Biomed Res 2018; 7:64. [PMID: 29862213 PMCID: PMC5952540 DOI: 10.4103/abr.abr_76_17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background: Today, leishmaniasis is a widespread, infectious parasitic disease caused by Leishmania spp. Natural-derived compounds are likely to provide a valuable source of new pharmaceuticals, and among them, quercetin derivatives may have antileishmanial effects. The antileishmanial activity of 3,5,7,3’,4’-pentahydroxyflavonol (quercetin) derivatives is partly attributed to the position and pKa of phenolic or catechol hydroxyl groups. Therefore, to optimize their leishmanicidal effect, the structural features of quercetin and its derivatives were improved by acylation or alkylation of hydroxyl groups and changing their pKa and consequently their activities. Materials and Methods: In this study, during a regioselective method, quercetin derivatives were synthesized. The structures of synthesized compounds were confirmed by mass, IR, 1H-, and 13C-NMR spectral data. The antileishmanial activities of compounds 1–6 were compared with glucantime as the standard drug against promastigotes of Leishmania major using standard cell-based leishmanicidal assay. Results: In this study, during a regioselective method, two 7-O-quercetin derivatives (5 and 6), and three quercetin acetate derivatives (2, 3, and 4) were synthesized. In detail, the IC50 values found against L. major were (1) 2.5 ± 0.92; (2) 2.85 ± 0.99; (3) 15.5 ± 1.95; (4) 13.5 ± 3.5; (5) 2.6 ± 0.57; and (6) 1.3 ± 0.35 μM while IC50 value of glucantime as the standard drug was 88.5 ± 9.47 μM. Conclusions: The present study showed an effective antileishmanial activity of quercetin semisynthetic compounds (1–6) against in vitro promastigotes of L. major. Among them, quercetin analogs with more lipophilic and iron-chelating activity showed more antiparasite activity.
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Affiliation(s)
- Maryam Mohajeri
- Department of Medicinal Chemistry, Isfahan Pharmaceutical Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Lotfollah Saghaei
- Department of Medicinal Chemistry, Isfahan Pharmaceutical Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mustafa Ghanadian
- Department of Pharmacognosy, School of Pharmacy and Pharmaceutical Sciences, Isfahan Pharmaceutical Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Sedighe Saberi
- Department of Medical Mycoparasitology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Nader Pestechian
- Department of Medical Mycoparasitology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Ehsan Ostadhusseini
- Department of Medicinal Chemistry, Isfahan Pharmaceutical Sciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
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21
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Tsunekawa R, Hanaya K, Higashibayashi S, Sugai T. Synthesis of fisetin and 2',4',6'-trihydroxydihyrochalcone 4'-O-β-neohesperidoside based on site-selective deacetylation and deoxygenation. Biosci Biotechnol Biochem 2018; 82:1316-1322. [PMID: 29699439 DOI: 10.1080/09168451.2018.1467263] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Fisetin and 2',4',6'-trihydroxydihyrochalcone 4'-O-β-neohesperidoside were synthesized from commercially available quercetin and naringin in five steps. The key steps are site-selective deacetylation and subsequent deoxygenation. The target molecules were obtained in 37% and 23% yields from the starting materials, respectively.
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Affiliation(s)
| | - Kengo Hanaya
- a Faculty of Pharmacy , Keio University , Tokyo , Japan
| | | | - Takeshi Sugai
- a Faculty of Pharmacy , Keio University , Tokyo , Japan
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22
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Guzmán-Gutiérrez SL, Nieto-Camacho A, Castillo-Arellano JI, Huerta-Salazar E, Hernández-Pasteur G, Silva-Miranda M, Argüello-Nájera O, Sepúlveda-Robles O, Espitia CI, Reyes-Chilpa R. Mexican Propolis: A Source of Antioxidants and Anti-Inflammatory Compounds, and Isolation of a Novel Chalcone and ε-Caprolactone Derivative. Molecules 2018; 23:molecules23020334. [PMID: 29415430 PMCID: PMC6017775 DOI: 10.3390/molecules23020334] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 01/16/2018] [Accepted: 01/16/2018] [Indexed: 12/20/2022] Open
Abstract
The propolis produced by bees are used in alternative medicine for treating inflammation, and infections, presumably due to its antioxidant properties. In this context, five propolis from México were investigated to determine their inhibitory lipid peroxidation properties. The ethyl acetate extract from a red propolis from Chiapas State (4-EAEP) was the most potent (IC50 = 1.42 ± 0.07 μg/mL) in the TBARS assay, and selected for further studies. This extract afforded two new compounds, epoxypinocembrin chalcone (6), and an ε-caprolactone derivative (10), as well as pinostrobin (1), izalpinin (2), cinnamic acid (3), pinocembrin (4), kaempherol (5), 3,3-dimethylallyl caffeate in mixture with isopent-3-enyl caffeate (7a + 7b), 3,4-dimethoxycinnamic acid (8), rhamnetin (9) and caffeic acid (11). The HPLC profile, anti-mycobacterial, and antioxidant properties of this extract was also determined. Most of the isolated compounds were also tested by inhibition of reactive oxygen species (ROS) in challenged mouse bone marrow-derived mast cells (BMMCs), and DPPH. Their anti-inflammatory activity was evaluated by TPA, and MPO (myeloperoxidase) activity by ear edema test in mice. The most potent compounds were 7a + 7b in the TBARS assay (IC50 = 0.49 ± 0.06 μM), and 2 which restored the ROS baseline (3.5 μM). Our results indicate that 4-EAEP has anti-oxidant, and anti-inflammatory properties due to its active compounds, suggesting it has anti-allergy and anti-asthma potential.
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Affiliation(s)
- Silvia Laura Guzmán-Gutiérrez
- Departamento de Inmunología, Catedrática CONACyT-Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
| | - Antonio Nieto-Camacho
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
| | - Jorge Ivan Castillo-Arellano
- Departamento de Farmacobiología, CINVESTAV-SUR, Instituto Politécnico Nacional, Calzada de los Tenorios 235, Col. Granjas Coapa C.P. 14330, Ciudad de México, Mexico.
| | - Elizabeth Huerta-Salazar
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
| | - Griselda Hernández-Pasteur
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
| | - Mayra Silva-Miranda
- Departamento de Inmunología, Catedrática CONACyT-Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
| | - Omar Argüello-Nájera
- El Colegio de la Frontera Sur, Ecosur-San Cristóbal, Carretera Panamericana y Periférico Sur s/n Barrio María Auxiliadora, San Cristóbal de Las Casas C.P. 29290, Chiapas, Mexico.
| | - Omar Sepúlveda-Robles
- Catedrático CONACyT-Unidad de Investigación Médica en Epidemiología Clínica, Hospital de Pediatría, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social (IMSS). Av. Cuauhtémoc No. 330. Colonia Doctores, Delegación Cuauhtémoc C.P. 06720, Ciudad de México, Mexico.
| | - Clara Inés Espitia
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
| | - Ricardo Reyes-Chilpa
- Departamento de Productos Naturales, Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico.
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Abstract
AIM Quercetin (Q1) is a flavonoid widely present in plants and endowed with several pharmacological properties mostly due to its antioxidant potential. Q1 shows anticancer activity and could be useful in cancer prevention. On the other hand, Q1 is poorly soluble in water and unstable in physiological systems, and its bioavailability is very low. METHODS A small set of Q1 derivatives (Q2-Q9) has been synthesized following opportunely modified chemical procedures previously reported. Anticancer activity has been evaluated by MTT assay. Human Topoisomerases inhibition has been performed by direct enzymatic assays. Apoptosis has been evaluated by TUNEL assay. ROS production and scavenging activity have been determined by immunofluorescence. RESULTS The anticancer profile of a small library of Q1 analogues, in which the OH groups were all or partially replaced with hydrophobic functional groups, has been evaluated. Two of the studied compounds demonstrated an interesting cytotoxic profile in two breast cancer models showing the capability to inhibit human Topoisomerases. CONCLUSION The studied compounds represent suitable leads for the development of innovative anticancer drugs. [Formula: see text].
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Sassi N, Mattarei A, Espina V, Liotta L, Zoratti M, Paradisi C, Biasutto L. Potential anti-cancer activity of 7- O -pentyl quercetin: Efficient, membrane-targeted kinase inhibition and pro-oxidant effect. Pharmacol Res 2017; 124:9-19. [DOI: 10.1016/j.phrs.2017.07.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 07/04/2017] [Accepted: 07/14/2017] [Indexed: 12/14/2022]
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25
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Chatzikonstantinou AV, Chatziathanasiadou MV, Ravera E, Fragai M, Parigi G, Gerothanassis IP, Luchinat C, Stamatis H, Tzakos AG. Enriching the biological space of natural products and charting drug metabolites, through real time biotransformation monitoring: The NMR tube bioreactor. Biochim Biophys Acta Gen Subj 2017; 1862:1-8. [PMID: 28974426 DOI: 10.1016/j.bbagen.2017.09.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 09/26/2017] [Accepted: 09/29/2017] [Indexed: 12/28/2022]
Abstract
BACKGROUND Natural products offer a wide range of biological activities, but they are not easily integrated in the drug discovery pipeline, because of their inherent scaffold intricacy and the associated complexity in their synthetic chemistry. Enzymes may be used to perform regioselective and stereoselective incorporation of functional groups in the natural product core, avoiding harsh reaction conditions, several protection/deprotection and purification steps. METHODS Herein, we developed a three step protocol carried out inside an NMR-tube. 1st-step: STD-NMR was used to predict the: i) capacity of natural products as enzyme substrates and ii) possible regioselectivity of the biotransformations. 2nd-step: The real-time formation of multiple-biotransformation products in the NMR-tube bioreactor was monitored in-situ. 3rd-step: STD-NMR was applied in the mixture of the biotransformed products to screen ligands for protein targets. RESULTS Herein, we developed a simple and time-effective process, the "NMR-tube bioreactor", that is able to: (i) predict which component of a mixture of natural products can be enzymatically transformed, (ii) monitor in situ the transformation efficacy and regioselectivity in crude extracts and multiple substrate biotransformations without fractionation and (iii) simultaneously screen for interactions of the biotransformation products with pharmaceutical protein targets. CONCLUSIONS We have developed a green, time-, and cost-effective process that provide a simple route from natural products to lead compounds for drug discovery. GENERAL SIGNIFICANSE This process can speed up the most crucial steps in the early drug discovery process, and reduce the chemical manipulations usually involved in the pipeline, improving the environmental compatibility.
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Affiliation(s)
- Alexandra V Chatzikonstantinou
- Department of Chemistry, Section of Organic Chemistry and Biochemistry, University of Ioannina, 45110 Ioannina, Greece; Department of Biological Applications and Technologies, University of Ioannina, 45110 Ioannina, Greece
| | - Maria V Chatziathanasiadou
- Department of Chemistry, Section of Organic Chemistry and Biochemistry, University of Ioannina, 45110 Ioannina, Greece
| | - Enrico Ravera
- Magnetic Resonance Center (CERM), University of Florence and Interuniversity Consortium for Magnetic Resonance in MetalloProteins (CIRMMP), 50019 Sesto Fiorentino, Italy; Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Marco Fragai
- Magnetic Resonance Center (CERM), University of Florence and Interuniversity Consortium for Magnetic Resonance in MetalloProteins (CIRMMP), 50019 Sesto Fiorentino, Italy; Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Giacomo Parigi
- Magnetic Resonance Center (CERM), University of Florence and Interuniversity Consortium for Magnetic Resonance in MetalloProteins (CIRMMP), 50019 Sesto Fiorentino, Italy; Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Ioannis P Gerothanassis
- Department of Chemistry, Section of Organic Chemistry and Biochemistry, University of Ioannina, 45110 Ioannina, Greece
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM), University of Florence and Interuniversity Consortium for Magnetic Resonance in MetalloProteins (CIRMMP), 50019 Sesto Fiorentino, Italy; Department of Chemistry "Ugo Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Haralambos Stamatis
- Department of Biological Applications and Technologies, University of Ioannina, 45110 Ioannina, Greece
| | - Andreas G Tzakos
- Department of Chemistry, Section of Organic Chemistry and Biochemistry, University of Ioannina, 45110 Ioannina, Greece.
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Cruz L, Guimarães M, Araújo P, Évora A, de Freitas V, Mateus N. Malvidin 3-Glucoside-Fatty Acid Conjugates: From Hydrophilic toward Novel Lipophilic Derivatives. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:6513-6518. [PMID: 28178778 DOI: 10.1021/acs.jafc.6b05461] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This work describes the lipophilization reactions of malvidin 3-glucoside with different saturated fatty acid chain lengths using an enzymatic synthesis and the study of their physical-chemical and antioxidant properties. The lipophilic anthocyanins were obtained with satisfactory yields (22-40%) after column chromatography purifications, and they revealed the same appealing chromatic features of the parent anthocyanin. All of the compounds were characterized by mass spectrometry, confirming the regioselective acylation on the glucose moiety. The octanol-water partition coefficients and the hydrophobicity index of the different derivatives were determined, confirming a lipophilicity increase concomitant with the fatty acid chain length. The antioxidant profile was also evaluated by using two in vitro methods (β-carotene-lineolate method and oxygen consumption assay). Overall, a maximum of antioxidant activity was achieved when malvidin 3-glucoside was conjugated with caprylic acid (C8). Altogether, the results obtained provide a good perspective for the technological application of these functionalized anthocyanins in the cosmetics and food industries.
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Affiliation(s)
- Luís Cruz
- REQUIMTE/LAQV, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre 687, 4169-007 Porto, Portugal
| | - Marta Guimarães
- REQUIMTE/LAQV, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre 687, 4169-007 Porto, Portugal
| | - Paula Araújo
- REQUIMTE/LAQV, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre 687, 4169-007 Porto, Portugal
| | - Ana Évora
- REQUIMTE/LAQV, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre 687, 4169-007 Porto, Portugal
| | - Victor de Freitas
- REQUIMTE/LAQV, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre 687, 4169-007 Porto, Portugal
| | - Nuno Mateus
- REQUIMTE/LAQV, Departamento de Quı́mica e Bioquı́mica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre 687, 4169-007 Porto, Portugal
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Tao T, He C, Deng J, Huang Y, Su Q, Peng M, Yi M, Darko KO, Zou H, Yang X. A novel synthetic derivative of quercetin, 8-trifluoromethyl-3,5,7,3',4'- O-pentamethyl-quercetin, inhibits bladder cancer growth by targeting the AMPK/mTOR signaling pathway. Oncotarget 2017; 8:71657-71671. [PMID: 29069736 PMCID: PMC5641079 DOI: 10.18632/oncotarget.17799] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 04/27/2017] [Indexed: 02/06/2023] Open
Abstract
Quercetin is a naturally existing compound and shows attractive anticancer properties for a variety of solid tumors including glioma, bladder cancer, hepatocellular carcinoma, breast cancer, hematological malignancies and prostate carcinoma. However, these anticancer properties have not been clinically approved due to unclear mechanistic information and its low bioactivity. In our previous study, we elucidated that quercetin activates AMPK pathway which is the major mechanism for its unique anticancer effect in bladder cancer. In the present study, we are trying to enhance its bioactivity by chemical modification using fluorination approach to prepare novel chemical entities, based on the principle of intermediate derivative method (IDM). The compound we obtained is named 8-trifluoromethyl-3,5,7,3′,4′-O-pentamethyl- quercetin (TFQ), characterized by NMR spectra and mass spectrum (MS). The results from MTT and cologenic assay in two human and one murine bladder cancer cell lines showed that TFQ exhibits more potent inhibition on the three bladder cancer cell lines than quercetin (Que) although this enhanced effects is not very dramatic. Furthermore, we found that the survival of normal bladder cells PEBC was not significantly suppressed by TFQ compared with Que. Western blot analysis showed that TFQ possess more potent AMPK activation than Que. The downstream of AMPK was further examined by western blot. TFQ treatment is able to inactivate mTOR signaling pathway with the regulation of mTOR, 4EBP1 and P70S6K. These results demonstrated that the fluorinated quercetin derivative TFQ inhibits bladder cancer cell growth through the AMPK/mTOR pathway. Altogether, our findings suggest that TFQ could serve as a new potential therapeutic agent for bladder cancer more effective than Que.
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Affiliation(s)
- Ting Tao
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Caimei He
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Jun Deng
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Yanjun Huang
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Qiongli Su
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Mei Peng
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, Xiangya Hospital, Central South University, Changsha, Hunan, 410008 China
| | - Meiling Yi
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Kwame Oteng Darko
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Hui Zou
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China
| | - Xiaoping Yang
- Key Laboratory of Small Targeted Molecules' Discovery, Hunan Normal University, Changsha, Hunan, 410013 China.,Department of Pharmacy, School of Medicine, Hunan Normal University, Changsha, Hunan, 410013 China.,Key Laboratory of Animal Nutrition and Human Health, Hunan Normal University, Changsha, Hunan, 410013 China
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28
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Aspirination of α-Aminoalcohol (Sarpogrelate M1). Molecules 2016; 21:molecules21091126. [PMID: 27571053 PMCID: PMC6274198 DOI: 10.3390/molecules21091126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 08/23/2016] [Accepted: 08/24/2016] [Indexed: 12/03/2022] Open
Abstract
Aspirination of α-aminoalcohol (sarpogrelate M1) has been performed under various general esterification conditions. In most cases, the desired aspirinate ester was obtained at a low yield with unexpected byproducts, the formation of which was mostly derived from the chemical properties of the tertiary α-amino group. After systematic analysis of those methods, the aspirinated sarpogrelate M1 was prepared using a two-step approach combining salicylate ester formation and acetylation.
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29
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Utilization of the inherent nucleophile for regioselective O-acylation of polyphenols via an intermolecular cooperative transesterification. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Kimura Y, Kato R, Oyama KI, Kondo T, Yoshida K. Efficient Preparation of Various O-Methylquercetins by Selective Demethylation. Nat Prod Commun 2016. [DOI: 10.1177/1934578x1601100722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
penta-O-Methylquercetin (2) was prepared by permethylation of quercetin (1). Selective demethylation of 2 using either BBr3 or BCl3/TBAI ( tetra-butylammonium iodide) gave five O-methylquercetins (3-6), with satisfactory yields. The reaction can be easily scaled-up. We established an efficient and large-scale preparation of O-methylquercetins.
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Affiliation(s)
- Yuki Kimura
- Graduate School of Information Science, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Ryo Kato
- Graduate School of Information Science, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Kin-ichi Oyama
- Chemical Instrumentation Facility, Research Center for Materials Science, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Tadao Kondo
- Graduate School of Information Science, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Kumi Yoshida
- Graduate School of Information Science, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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31
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Synthesis, characterization, anti-inflammatory and anti-proliferative activity against MCF-7 cells of O-alkyl and O-acyl flavonoid derivatives. Bioorg Chem 2015; 63:45-52. [DOI: 10.1016/j.bioorg.2015.09.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Revised: 09/17/2015] [Accepted: 09/23/2015] [Indexed: 01/17/2023]
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32
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Mishurov DA, Voronkin AA, Roshal AD. Synthesis, molecular structure and optical properties of glycidyl derivatives of quercetin. Struct Chem 2015. [DOI: 10.1007/s11224-015-0694-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Karimova ER, Baltina LA, Spirikhin LV, Kondratenko RM, Farkhutdinov RR, Petrova IV. Synthesis and Antioxidant Activity of Quercetin Ethers. Chem Nat Compd 2015. [DOI: 10.1007/s10600-015-1432-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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34
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Biasutto L, Mattarei A, Paradisi C. Synthesis and testing of novel isomeric mitochondriotropic derivatives of resveratrol and quercetin. Methods Mol Biol 2015; 1265:161-179. [PMID: 25634275 DOI: 10.1007/978-1-4939-2288-8_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report here the synthetic procedures to obtain mitochondria-targeted resveratrol and quercetin derivatives. These two compounds were selected among plant polyphenols because both are well studied and have many health-promoting actions. The synthetic strategies reported here are however expected to be adaptable to other polyphenols with similar reactivity at the phenolic hydroxyls.Mitochondrial targeting can be achieved by incorporating in the molecule an "electrophoretic" membrane-permeant, triphenylphosphonium cation. We have generally chosen to link it via a butyl spacer forming an ether bond with one of the phenolic oxygens. The first step toward the synthesis of all mitochondriotropic derivatives described in this work is the production of a regiospecific -(4-O-chlorobutyl) derivative. Triphenylphosphonium (P(+)Ph3I(-)) is then introduced through two consecutive nucleophilic substitution steps: -Cl→-I→-P(+)Ph3I(-). Pure mono-substituted chlorobutyl regioisomers are obtained by purification from the reaction mixture in the case of resveratrol, while specific protection strategies are required for quercetin to favor alkylation of one specific hydroxyl.Physicochemical properties of the derivatives (i.e., water solubility, affinity for cell membranes) can be furthermore modulated by functionalization of the remaining hydroxyls; we report here synthetic protocols to obtain acetylated and methylated analogs.We also briefly describe how to assess mitochondrial accumulation of the derivatives; the proposed techniques are the use of a TPP(+)-selective electrode (with isolated rat liver mitochondria) and fluorescence microscopy (with cultured cells).
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Affiliation(s)
- Lucia Biasutto
- CNR Institute of Neurosciences, Viale G. Colombo 3, 35121, Padova, Italy,
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35
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Li P, Yin ZQ, Li SL, Huang XJ, Ye WC, Zhang QW. SIMULTANEOUS DETERMINATION OF EIGHT FLAVONOIDS AND POGOSTONE IN POGOSTEMON CABLIN BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10826076.2013.809545] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Ping Li
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Macau
| | - Zhi-Qi Yin
- b Department of Natural Medicinal Chemistry , China Pharmaceutical University , Nanjing , China
| | - Song-Lin Li
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Macau
- c Department of Pharmaceutical Analysis and Metabolomics , Jiangsu Province Academy of Traditional Chinese Medicine , Nanjing , China
| | - Xiao-Jun Huang
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Macau
- d Institute of Traditional Chinese Medicine and Natural Products, Jinan University , Guangzhou , China
| | - Wen-Cai Ye
- d Institute of Traditional Chinese Medicine and Natural Products, Jinan University , Guangzhou , China
| | - Qing-Wen Zhang
- a State Key Laboratory of Quality Research in Chinese Medicine , Institute of Chinese Medical Sciences, University of Macau , Macau
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36
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Mainini F, Contini A, Nava D, Corsetto PA, Rizzo AM, Agradi E, Pini E. Synthesis, Molecular Characterization and Preliminary Antioxidant Activity Evaluation of Quercetin Fatty Esters. J AM OIL CHEM SOC 2013. [DOI: 10.1007/s11746-013-2314-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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37
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Cho SY, Kim MK, Park KS, Choo H, Chong Y. Quercetin–POC conjugates: Differential stability and bioactivity profiles between breast cancer (MCF-7) and colorectal carcinoma (HCT116) cell lines. Bioorg Med Chem 2013; 21:1671-9. [DOI: 10.1016/j.bmc.2013.01.057] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 01/18/2013] [Accepted: 01/27/2013] [Indexed: 10/27/2022]
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38
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Sassi N, Biasutto L, Mattarei A, Carraro M, Giorgio V, Citta A, Bernardi P, Garbisa S, Szabò I, Paradisi C, Zoratti M. Cytotoxicity of a mitochondriotropic quercetin derivative: Mechanisms. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:1095-106. [DOI: 10.1016/j.bbabio.2012.03.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2011] [Revised: 02/15/2012] [Accepted: 03/05/2012] [Indexed: 10/28/2022]
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39
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Lipophilization of flavonoids for their food, therapeutic and cosmetic applications. ACTA CHIMICA SLOVACA 2012. [DOI: 10.2478/v10188-012-0010-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Lipophilization of flavonoids for their food, therapeutic and cosmetic applicationsFlavonoids represent large group of plant pigments. These polyphenolic compounds may be found in the nature as active components of fruits, vegetables and other plants and derived products. Due to established biological effects they are attractive substances for many areas of human life. Many flavonoids are nowadays used in pharmaceutical, cosmetic and food preparations. Their practical applications are in most cases limited by low solubility and stability in lipophilic media. Chemical or enzymatic lipophilization of flavonoid skeleton may not only increase their solubility and stability in lipophilic environment but also their biological properties. This review summarizes current knowledge in this field.
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40
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Yahagi T, Daikonya A, Kitanaka S. Flavonol acylglycosides from flower of Albizia julibrissin and their inhibitory effects on lipid accumulation in 3T3-L1 cells. Chem Pharm Bull (Tokyo) 2012; 60:129-36. [PMID: 22223384 DOI: 10.1248/cpb.60.129] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Obesity is a serious health problem worldwide. We investigated the anti-obesity effect of the flower of Albizia julibrissin DURAZZ. (Leguminosae). A 90% EtOH extract of the flower inhibited adipogenesis in 3T3-L1 preadipocytes, as well as the activity of glycerol-3-phosphate dehydrogenase (GPDH) activity. New flavonol acylglycosides (1-4) and eighteen known compounds (5-22) were isolated by bioassay-directed fractionation. These new glycosides were elucidated to be 3″-(E)-p-coumaroylquercitrin (1), 3″-(E)-feruloylquercitrin (2), 3″-(E)-cinnamoylquercitrin (3), and 2″-(E)-cinnamoylquercitrin (4) on the basis of spectroscopic and chemical analysis. These compounds inhibited adipogenesis in 3T3-L1 preadipocytes. In particular, 2 exhibited potent inhibitory effects on triglyceride accumulation. Furthermore, GPDH activity was inhibited by 2. Additionally, 2 inhibited glucose uptake in 3T3-L1 adipocytes. These results indicate that the 90% EtOH extract and compounds isolated from the flower of A. julibrissin inhibit adipogenesis in 3T3-L1 preadipocytes and may have anti-obesity effect through the inhibition of preadipocyte differentiation.
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Affiliation(s)
- Tadahiro Yahagi
- School of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
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41
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Mattarei A, Sassi N, Durante C, Biasutto L, Sandonà G, Marotta E, Garbisa S, Gennaro A, Paradisi C, Zoratti M. Redox Properties and Cytotoxicity of Synthetic Isomeric Mitochondriotropic Derivatives of the Natural Polyphenol Quercetin. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100573] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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