Hiromi Yoshida

Kobe Gakuin University, Kōbe, Hyōgo, Japan

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Publications (219)486.54 Total impact

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    ABSTRACT: The aim of the present study was to investigate the biological activity of 20 essential oils (EOs) derived from herbal plants and citrus fruits. The in vitro anti-allergic and anti-inflammatory activities of these oils were investigated, and the EO which was found to have the strongest activity of the 20 EOs examined, was investigated further to identify its components and bioactive compounds. The in vitro anti-allergic activity was determined by measuring the release of β-hexosaminidase from rat basophilic leukemia (RBL-2H3) cells treated with the calcium ionophore, A23187. The in vitro anti-inflammatory activity was determined by measuring the production of tumor necrosis factor-α (TNF-α) in RAW264.7 murine macrophages treated with lipopolysaccharide. Among the EOs examined, lemongrass [Cymbopogon citratus (DC.) Stapf] elicited the strongest anti-allergic and anti-inflammatory effects. A principal component of this EO is citral (3,7-dimethyl-2,6-octadien-1-al) (74.5%), a mixture of the stereoisomers, geranial (trans‑citral, 40.16%) and neral (cis-citral, 34.24%), as determined by chromatography-mass spectrometry analysis. The activities of citral and geranial are similar to those of lemongrass EO. These compounds elicited significant in vivo anti-allergic and anti-inflammatory effects, suppressing an immunoglobulin E (IgE)-induced passive cutaneous anaphylactic reaction in mice and a 12-O-tetradecanoylphorbol-13-acetate-induced inflammatory mouse ear edema, respectively. Our data demonstrate that lemongrass EO and its constituents, citral and geranial, may be a therapeutic candidate for allergic and inflammatory diseases.
    International Journal of Molecular Medicine 03/2014; · 1.96 Impact Factor
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    ABSTRACT: During the screening of selective DNA polymerase (pol) inhibitors from more than 50 plant food materials, we found that the extract from steamed germinated soybeans (Glycine max L.) inhibited human pol λ activity. Among the three processed soybean samples tested (boiled soybeans, steamed soybeans, and steamed germinated soybeans), both the hot water extract and organic solvent extract from the steamed germinated soybeans had the strongest pol λ inhibition. We previously isolated two glucosyl compounds, a cerebroside (glucosyl ceramide, AS-1-4, compound ) and a steroidal glycoside (eleutheroside A, compound ), from dried soybean, and these compounds were prevalent in the extracts of the steamed germinated soybeans as pol inhibitors. The hot water and organic solvent extracts of the steamed germinated soybeans and compounds and selectively inhibited the activity of eukaryotic pol λ in vitro but did not influence the activities of other eukaryotic pols, including those from the A-family (pol γ), B-family (pols α, δ, and ε), and Y-family (pols η, ι, and κ), and also showed no effect on the activity of pol β, which is of the same family (X) as pol λ. The tendency for in vitro pol λ inhibition by these extracts and compounds showed a positive correlation with the in vivo suppression of TPA (12-O-tetradecanoylphorbol-13-acetate)-induced inflammation in mouse ear. These results suggest that steamed germinated soybeans, especially the glucosyl compound components, may be useful for their anti-inflammatory properties.
    Food & function. 02/2014;
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    ABSTRACT: We previously found that vitamin K3 (menadione, 2-methyl-1,4-naphthoquinone) inhibits the activity of human mitochondrial DNA polymerase γ (pol γ). In this study, we focused on plumbagin (5-hydroxy-2-methyl-1,4-naphthoquinone), and chemically synthesized novel plumbagins conjugated with C2:0 to C22:6 fatty acids (5-O-acyl plumbagins). These chemically modified plumbagins enhanced mammalian pol inhibition and their cytotoxic activity. Plumbagin conjugated with chains consisting of more than C18-unsaturated fatty acids strongly inhibited the activities of calf pol α and human pol γ. Plumbagin conjugated with oleic acid (C18:1-acyl plumbagin) showed the strongest suppression of human colon carcinoma (HCT116) cell proliferation among the ten synthesized 5-O-acyl plumbagins. The inhibitory activity on pol α, a DNA replicative pol, by these compounds showed high correlation with their cancer cell proliferation suppressive activity. C18:1-Acyl plumbagin selectively inhibited the activities of mammalian pol species, but did not influence the activities of other pols and DNA metabolic enzymes tested. This compound inhibited the proliferation of various human cancer cell lines, and was the cytotoxic inhibitor showing strongest inhibition towards HT-29 colon cancer cells (LD50 = 2.9 µM) among the nine cell lines tested. In an in vivo anti-tumor assay conducted on nude mice bearing solid tumors of HT-29 cells, C18:1-acyl plumbagin was shown to be a promising tumor suppressor. These data indicate that novel 5-O-acyl plumbagins act as anti-cancer agents based on mammalian DNA replicative pol α inhibition. Moreover, the results suggest that acylation of plumbagin is an effective chemical modification to improve the anti-cancer activity of vitamin K3 derivatives, such as plumbagin.
    PLoS ONE 01/2014; 9(2):e88736. · 3.53 Impact Factor
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    ABSTRACT: Variotin (1) and three novel compounds, formosusin A (2), B (3), and C (4), were isolated from the cultures of the fungus Paecilomyces formosus, and their structures were determined by spectroscopic analyses. Compound 2 is (6Z,8E,10E)-variotin, a new cis-olefin analog of compound 1. Compound 2 selectively inhibited the activity of mammalian DNA polymerase β (pol β) in vitro, with an IC50 of 35.6μM. By contrast, compounds 1, 3, and 4 did not influence the activity of pol β. These four compounds showed no effect on the activities of other 10 mammalian pols (i.e., pols α, γ, δ, ε, η, ι, κ, λ, and μ, and terminal deoxynucleotidyl transferase). These compounds also did not inhibit the activities of fish, insect, plant, and prokaryotic pols and other DNA metabolic enzymes tested. These results suggested that compound 2 could be a selective inhibitor of mammalian pol β. The compound 2-induced inhibition of rat pol β activity was competitive and non-competitive with respect to the DNA template-primer substrate and the dNTP substrate, respectively. On the basis of these results, the relationship between the three-dimensional structure and pol β inhibitory mechanism of compound 2 is discussed.
    Bioorganic & medicinal chemistry 12/2013; · 2.82 Impact Factor
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    ABSTRACT: During the screening of selective DNA polymerase (pol) inhibitors, we isolated cycloartenyl trans-ferulate (CAF), which is a major component of γ-oryzanol, which is a byproduct formed during the production of Japanese rice wine "sake". CAF selectively inhibited the activity of mammalian A, B, and X pol families, but Y family pols were not affected. CAF did not influence the activities of plant or prokaryotic pols, nor the activity of other DNA metabolic enzymes tested. Individual chemical components of CAF, including cycloartenol (CA) and ferulic acid (FA), did not inhibit pol enzyme activities. CAF suppressed TPA (12-O-tetradecanoylphorbol-13-acetate)-induced inflammation in the mouse ear, but CA and FA did not. The ability to inhibit mammalian pol enzymes in vitro was positively correlated with their propensity to suppress inflammation in vivo. These results suggest that this byproduct formed during the sake-brewing process is useful as an anti-inflammatory agent.
    Food Chemistry 11/2013; 141(2):1000-7. · 3.33 Impact Factor
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    ABSTRACT: Ustusorane D and penicisochromans B-D are natural isochromans isolated from Aspergillus ustus 094102 and Penicillium sp. PSU-F40, respectively. Herein, we report the syntheses of (-)-ustusorane D and (+)-penicisochroman B and the structures of penicisochromans C and D. The relative configuration of natural ustusorane D and the absolute configuration of natural penicisochroman B were determined. Two plausible structures for penicisochroman C were evaluated through synthesis, but their (1)H and (13)C NMR data were not in agreement with those of the natural product. The structural revision and the determination of the absolute configuration of natural penicisochroman D were achieved. Structure-activity relationship studies of the synthetic compounds as well as a series of related isochromans indicated that the enone of the furanone moiety was essential for the cytotoxicity of these compounds toward HCT116 human colon cancer cells. Pseudodeflectusin, the related natural isochroman, suppressed cell growth and induced apoptosis in HCT116 cells.
    Journal of Natural Products 09/2013; · 3.29 Impact Factor
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    ABSTRACT: In this study, the inhibitory activities against mammalian DNA polymerases (pols) of 16 major bioflavonoids were investigated. Myricetin (3,3',4',5,5',7-hexahydroxyflavone) was the most potent inhibitor of pols amongst the compounds tested, with IC50 values of 21.3-40.9μM. This compound did not affect the activities of plant (cauliflower) pol α or prokaryotic pols. Myricetin also inhibited human DNA topoisomerase II (topo II) activity with an IC50 value of 27.5μM, but did not inhibit the activities of other DNA metabolic enzymes tested. Myricetin also did not influence the direct binding to double stranded DNA as determined by thermal transition analysis. It was found to prevent the proliferation of human colon HCT116 carcinoma cells with an LD50 of 28.2μM, halt the cell cycle in G2/M phase, and induce apoptosis. These results suggest that the decrease of proliferation may be a result of the inhibition of cellular topoisomerase (topo) II rather than pols.
    Food Chemistry 08/2013; 139(1-4):910-8. · 3.33 Impact Factor
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    ABSTRACT: The inhibitory activity of 3 soy isoflavones (daidzein, genistein and glycitein) and their glycosides (daidzin, genistin and glycitin) on mammalian DNA polymerases (pols) and topoisomerases (topos) was investigated. Of the compounds tested, only genistein selectively inhibited human topo II activity and had an IC50 value of 37.5 µM. These isoflavones had no effect on the activity of human topo I; mammalian pols α, β, γ and κ; or on any other DNA metabolic enzyme tested. Thermal transition analysis indicated that genistein did not influence the direct binding to double-stranded DNA. Genistein prevented the proliferation of HCT116 human colon carcinoma cells with an LD50 of 94.0 µM and it halted the cell cycle in G2/M phase. These results suggest that decreases in cell proliferation due to genistein may result from the inhibition of cellular topo II and that genistein, a major soy isoflavone, may be an anticancer food component. The relationship between the structures and these bioactivities of soy isoflavones is discussed.
    International Journal of Oncology 07/2013; · 2.66 Impact Factor
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    ABSTRACT: Carotenoids are organic pigments that are found in the chloroplasts and chromoplasts of plants and some other photosynthetic organisms like algae, bacteria, and fungi. There are over 600 known carotenoids; they are divided into two classes, xanthophylls (which contain oxygen) and carotenes (which are purely hydrocarbons, and contain no oxygen). All carotenoids are tetraterpenoids, meaning that they are produced from 8 isoprene (2-methyl-1,3-butadiene) molecules and contain 40 carbon atoms. In humans, four carotenoids (beta-carotene, alpha-carotene, gamma-carotene, and beta-crypoxanthin) have vitamin A activity (meaning they can be converted to retinal). Bixin ((2E,4E,6E,8E,10E,12E,14E,16Z,18E)-20-methoxy-4,8,13,17-tetramethyl-20-oxoicosa 2,4,6,8,10,12,14, 16,18-nonaenoic acid) is an polyunsaturated, norcarotenoid, red dye from the main fruit of annatto, its seeds reduced to powder are widely used to color food and sunscreen. The annatto seeds contain about 5% pigment, which consist of 70-80% of bixin. The bixin is soluble in fats but insoluble in water. When exposed to alkalis, the methyl ester is hydrolyzed and produces the norbixin dicarboxylic acid, a water soluble derivative. It is a chemically unstable compound when isolated and is converted, via isomerization, in bixin trans-(β-bixin), the cis-trans isomer of bixin. Carotenoids bixin and norbixin have two stereo configurations, i.e., cis and trans. In extracts, under normal conditions, the cis-bixin or cis-norbixin are more unstable. The cis-bixin or cis-norbixin solution under heating are partially converted into the trans configuration, which is more stable and known as isobixin and isonorbixin. Brazil is one of the major producers of annatto and its planting occurs primarily in the North and Northeast regions, although its cultivation in the last decades expanded to other regions, in the Southeast, especially Sao Paulo and Rio de Janeiro. The international market growing demand is justified by the prohibition of synthetic dyes due to studies that have proven their toxicity. Like many carotenoids, bixin and norbixin also present significant antioxidant properties. Both carotenoids can reduce levels of malondialdehyde (biomarker of lipid peroxidation) when induced by cyclophosphamide (immunosuppressant), as well as protect the DNA from oxidative damage in vitro. Bixin inhibited in vitro generation of superoxide and the generation of reactive oxygen species such as hydrogen peroxide and hydroxyl radicals and with protective action against mutagenicity in human lymphocytes. Besides the antioxidant property, these carotenoids also present important metabolic actions in lipids and sugars. Bixin acts as PPAR-γ agonist (receptor activated by peroxisome proliferators range), a nuclear receptor that acts in the metabolism of lipids and carbohydrates and has anti-inflammatory, immunomodulatory and anti-atherosclerotic action. This interaction of BIX and the PPAR gamma receptor may increase the sensitivity to insulin in adipocytes so that there is a greater glucose uptake. Furthermore, the interaction with the receptor regulates lipid metabolism improving metabolic syndrome present in diabetic patients.
    Carotenoids: Food Sources, Production and Health Benefits, 1 edited by Masayoshi Yamaguchi, 07/2013: chapter Chapter 13 - Bixin and Norbixin: Chemistry, Production and Health Benefits: pages 261-270; Nova Publishers., ISBN: 978-1-62808-622-5
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    ABSTRACT: Low molecular weight (LMW) polyphenolics containing a polyhydroxylated benzyl moiety are abundant in medicinal plants. In the present study, we report on the activities of seven LMW polyphenolics isolated from Inonotus obliquus, a medicinal mushroom. The isolated compounds included caffeic acid (CA), 3,4-dihydroxybenzalacetone (DBL), gallic acid, syringic acid, protocatechuic acid, 3,4-dihydroxybenzaldehyde and 2,5-dihydroxyterephthalic acid. We analyzed their inhibitory effects on DNA polymerase (pol) and DNA topoisomerase (topo), and their effects on human cancer cell growth. All isolated compounds inhibited human topo II activity; the most potent were DBL and CA, which contain a catechol propanoid moiety. CA and DBL inhibited the activity of human topo I, whereas other compounds had no effect. No compound modulated the activities of 11 mammalian pol species or other DNA metabolic enzymes, including T7 RNA polymerase, mouse IMP dehydrogenase (type II), T4 polynucleotide kinase and bovine deoxyribonuclease I. CA and DBL markedly suppressed the proliferation of human colon HCT116 carcinoma cells with an LD50 of 70.0 and 49.4 µM, respectively, and halted the cell cycle in the G2/M phase. The suppressive effect of these compounds on cancer cell growth correlated with their ability to inhibit topo II. These results suggest that CA- and DBL-dependent decreases in cell proliferation are due to the inhibition of cellular topo II. The mechanism of action of these catechol propanoid compounds and the implication for their use as anticancer agents are discussed.
    Molecular Medicine Reports 06/2013; · 1.17 Impact Factor
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    ABSTRACT: Vitamin Ks (VKs) are fat-soluble quinone compounds known to have various bioactivities. This review describes the inflammatory effects of VKs and their related quinone derivatives based on DNA polymerase (pol) inhibition. VK3, but not VK1 or VK2 (=MK-4), inhibited the activity of human pol γ, which is the DNA replicative pol in mitochondria. Of the intermediate compounds between VK2 and VK3 (namely MK-3, MK-2 and MK-1), MK-2 was the strongest inhibitor of mammalian pols α, κ and λ, which belong to the B-, Y- and X-families of pols, respectively. Among the VK3 based quinone derivatives, such as 1,4-naphthoquinone (NQ), 2-dimethyl-1,4-naphthoquinone (1,2-dimethyl-NQ), 1,4-benzoquinone (BQ), 9,10-anthraquinone (AQ) and 5,12-naphthacenequinone (NCQ), NQ was the strongest inhibitor of mammalian pols α and λ, in particular, DNA repair-related pol λ. Among the all compounds tested, NQ displayed the strongest suppression of tumor necrosis factor (TNF)-α production induced by lipopolysaccharide (LPS) in a cell culture system using RAW264.7 mouse macrophages. NQ also suppressed the expression of pol λ protein in these cells, after LPS-treated RAW264.7 cells were stimulated to induce pol λ expression. In an in vivo mouse model of LPS-evoked acute inflammation, intraperitoneal injection of NQ into mice suppressed TNF-α production in peritoneal macrophages and serum. In an in vivo colitis mouse model induced using dextran sulfate sodium (DSS), NQ markedly suppressed DSS-evoked colitis. The promising anti-inflammatory candidates based on the inhibition of DNA repair-related pols, such as pol λ, by VKs quinone derivatives, such as NQ, are discussed.
    International Journal of Oncology 01/2013; · 2.66 Impact Factor
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    ABSTRACT: Endogenous tocopherols in extracted lipids from Jack beans (Canavalia gladiata DC.) were determined by high-performance liquid chromatography (HPLC), and were investigated in relation to the fatty acids (FA) distribution of triacylgycerols (TAG) and phospholipids (PL). The dominant tocopherols were (δ)-tocopherol (78.9-96.5mg%) and (γ)-tocopherol (42.1-56.1mg%) with much smaller amounts of (α)-tocopherol (1.1-1.3mg%). The lipids of Jack beans comprised mainly TAG (34.6-38.6wt.%) and PL (54.8-57.4wt.%), and other components were also detected in minor proportions (0.3-3.8wt.%). The PL components included phosphatidyl choline (46.2-48.7wt.%), phosphatidyl inositol (23.4-29.6wt.%) and phosphatidyl ethanolamine (18.5-21.2wt.%). Comparison of these different beans showed, with a few exceptions, no significant differences (P>0.05) in FA distribution. The FA distribution of TAG among the five beans was evident in the Jack beans: unsaturated FA (93.3-95.3wt.%) were predominantly concentrated at the sn-2 position and saturated FA (33.6-34.4wt.%) primarily occupying the sn-1 position or sn-3 position. The results obtained from this work would provide useful information to both producers and consumers for manufacturing functional foods or beverages in Japan and elsewhere.
    Food Chemistry 01/2013; 136(2):807-12. · 3.33 Impact Factor
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    ABSTRACT: Previously, we observed that purified monogalactosyl diacylglycerol (MGDG), a major glycoglycerolipid from spinach, selectively inhibits the activities of mammalian replicative DNA polymerases (α, δ and ε). However, the function of MGDG following ingestion is not well-known. In the present study, spinach MGDG suppressed the proliferation of Colon26 mouse colon cancer cells with an LD(50) of 24 μg/ml in vitro. γ-cyclodextrin (CD)-MGDG complex was prepared and administered orally following Colon26 mouse tumor adhesion for 26 days. It was observed that 20 mg/kg equivalent (eq.) of the CD-MGDG complex reduced tumor volume by ∼60% compared with that of the vehicle-treated controls. In immunohistochemical analysis, the CD-MGDG complex group showed a decreased number of proliferating cell nuclear antigen (PCNA)-positive cells and reduction of mitosis in the tumor cells compared with the control group. In addition, the CD-MGDG complex increased the number of terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL)-positive apoptotic cells and inhibited CD31-positive tumor blood vessel growth significantly. These results suggest that MGDG has the potential for cancer prevention and health promotion.
    Experimental and therapeutic medicine 01/2013; 5(1):17-22. · 0.34 Impact Factor
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    ABSTRACT: The present study was designed to investigate the anticancer activity of novel nine small peptides (compounds 1-9) derived from TT-232, a somatostatin structural analogue, by analyzing the inhibition of mammalian DNA polymerase (pol) and human cancer cell growth. Among the compounds tested, compounds 3 [tert-butyloxycarbonyl (Boc)-Tyr-Phe-1-naphthylamide], 4 (Boc-Tyr-Ile-1-naphthylamide), 5 (Boc-Tyr-Leu-1-naphthylamide) and 6 (Boc-Tyr-Val-1-naphthylamide) containing tyrosine (Tyr) but no carboxyl groups, selectively inhibited the activity of rat pol β, which is a DNA repair-related pol. Compounds 3-6 strongly inhibited the growth of human colon carcinoma HCT116 p53(+/+) cells. The influence of compounds 1-9 on HCT116 p53(-/-) cell growth was similar to that observed for HCT116 p53(+/+) cells. These results suggest that the cancer cell growth suppression induced by these compounds might be related to their inhibition of pol. Compound 4 was the strongest inhibitor of pol β and cancer cell growth among the nine compounds tested. This compound specifically inhibited rat pol β activity, but had no effect on the other 10 mammalian pols investigated. Compound 4 combined with methyl methane sulfonate (MMS) treatment synergistically suppressed HCT116 p53(-/-) cell growth compared with MMS alone. This compound also induced apoptosis in HCT116 cells with or without p53. From these results, the influence of compound 4, a specific pol β inhibitor, on the relationship between DNA repair and cancer cell growth is discussed.
    Bioorganic & medicinal chemistry 11/2012; · 2.82 Impact Factor
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    ABSTRACT: BACKGROUND: Gemcitabine (GEM) is used to treat various carcinomas and represents an advance in pancreatic cancer treatment. In the screening for DNA polymerase (pol) inhibitors, a glycoglycerolipid, monogalactosyl diacylglycerol (MGDG), was isolated from spinach. METHODS: Phosphorylated GEM derivatives were chemically synthesized. In vitro pol assay was performed according to our established methods. Cell viability was measured using MTT assay. RESULTS: Phosphorylated GEMs inhibition of mammalian pol activities assessed, with the order of their effect ranked as: GEM-5'-triphosphate (GEM-TP)>GEM-5'-diphosphate>GEM-5'-monophosphate>GEM. GEM suppressed growth in the human pancreatic cancer cell lines BxPC-3, MIAPaCa2 and PANC-1 although phosphorylated GEMs showed no effect. MGDG suppressed growth in these cell lines based on its selective inhibition of replicative pol species. Kinetic analysis showed that GEM-TP was a competitive inhibitor of pol α activity with nucleotide substrates, and MGDG was a noncompetitive inhibitor with nucleotide substrates. GEM combined with MGDG treatments revealed synergistic effects on the inhibition of DNA replicative pols α and γ activities compared with GEM or MGDG alone. In cell growth suppression by GEM, pre-addition of MGDG significantly enhanced cell proliferation suppression, and the combination of these compounds was found to induce apoptosis. In contrast, GEM-treated cells followed by MGDG addition did not influence cell growth. CONCLUSIONS: GEM/MGDG enhanced the growth suppression of cells based on the inhibition of pol activities. GENERAL SIGNIFICANCE: Spinach MGDG has great potential for development as an anticancer food compound and could be an effective clinical anticancer chemotherapy in combination with GEM.
    Biochimica et Biophysica Acta 11/2012; · 4.66 Impact Factor
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    ABSTRACT: In this study, the inhibitory activities against DNA polymerases (pols) and DNA topoisomerases (topos) by eight major green tea catechin derivatives (flavan-3-ols) were investigated. Some catechins inhibited mammalian pols (α and β) and human topos (I and II), with (-)-epigallocatechin gallate (EGCg) the strongest inhibitor of both enzyme types, showing IC(50) values of 3.8-21.5 and 2.0-20.0 μM, respectively. EGCg did not affect the activities of plant (cauliflower) pol α or prokaryotic pols and showed no effect on the activities of other DNA metabolic enzymes tested. Next, a method was established for assay of mouse one-cell zygote development inhibition, the catechin derivatives screened for bioactivity, and the inhibition was assessed and their effects ranked as: EGCg > GCg > Cg > others. In the mouse one-cell zygote assay, EGCg at 50 μM increased abnormal cells and 75 μM of EGCg-induced apoptosis. The observed ranking of catechin derivative inhibition effects against mouse one-cell zygote development in vivo was similar to their ranking by topo inhibition in vitro rather than by pol inhibition; therefore, topo inhibition might have been effecting zygote development inhibition. These results suggested that catechin derivatives indeed reached the nuclear DNA where topo inhibition can occur, thus causing the observed cellular effects. From these findings, this zygote development inhibition assay will be useful as an anti-pregnant agent screening.
    Journal of Bioscience and Bioengineering 10/2012; · 1.74 Impact Factor
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    ABSTRACT: In this study, the biological activity of 20 essential oils (EOs) from herbal plants and citrus fruits were investigated in terms of mammalian DNA polymerase (pol) inhibitory activity, anticancer cell (human colon carcinoma, HCT116) growth activity, antiallergic activity, as anti-β-hexosaminidase release activity in rat basophilic leukemia RBL-2H3 cells treated with calcium ionophore A23187, and antioxidant activity by a lipophilic-oxygen radical absorbance capacity method. These EOs showed patterns of inhibition of pol α, a DNA replicative pol, similar to their anticancer cell growth activity, and their inhibitory activity on pol λ, a DNA repair/recombination pol, by the EOs showed correlation with anti-β-hexosaminidase release activity. Among these EOs, chamomile (Matricaria chamomilla L.) was the strongest inhibitor of pols α and λ and showed significant effects on both cancer cell growth and mast cell degranulation. Based on these results, chamomile EO can be recommended as a potentially useful, bioactive candidate for therapeutic applications.
    Journal of Agricultural and Food Chemistry 10/2012; · 3.11 Impact Factor
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    ABSTRACT: Telomerase is a ribonucleoprotein complex that elongates telomeric DNA and appears to play an important part in the cellular immortalization of cancers. In the screening of potent inhibitors of human telomerase, several inhibitors have been discovered from natural and chemical sources. Some compounds potently inhibit the activity of human telomerase. Rubromycins and fatty acids such as β-rubromycin and oleic acid, respectively, were found to be inhibitors of human telomerase. The IC50 values of β-rubromycin and oleic acid were 8.60 and 8.78 μM, respectively. A kinetic study revealed that these compounds competitively inhibited the activity of telomerase with respect to the substrate of the primer and dNTP. The energy-minimized three-dimensional structure of β-rubromycin and oleic acid was calculated and designed. The V-shaped curve and molecule length of 18.7-20.3 � in these compound structures were suggested to be important for telomerase inhibition. The three-dimensional structure of the active site of telomerase (i.e., the binding site of the primer and dNTP substrate) might have a "pocket" that could "join" these compounds. These results appear to suggest a potential structure for the development of more potent inhibitors of human telomerase.
    Mini Reviews in Medicinal Chemistry 07/2012; 12(11):1135-43. · 2.87 Impact Factor
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    ABSTRACT: The glycoglycerolipid monogalactosyl diacylglycerol (MGDG) isolated from spinach selectively inhibits the activities of replicative DNA polymerase species and suppresses the growth of human cancer cell lines, while not affecting normal human cells. Liposomes, carrying surface-bound sialyl Lewis X (SLX) and containing MGDG (SLX-Lipo-MGDG) and the fluorescent dye Cy5.5, were administered intravenously to mice bearing HT-29 human colon adenocarcinoma tumors and liposome distribution observed using fluorescence imaging equipment in vivo. In an in vivo antitumor assay on nude mice bearing HT-29 solid tumors, SLX-Lipo-MGDG was shown to be a stronger and more promising suppressor of solid tumors than MGDG alone. These results suggest that spinach MGDG could be developed into an anticancer compound, SLX-Lipo-MGDG could serve as an effective clinical anticancer drug and that these liposomes may be useful tools as the basis for active targeting drug delivery systems.
    Oncology Reports 07/2012; 28(3):821-8. · 2.30 Impact Factor
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    ABSTRACT: Extracted lipids obtained from Jack beans (white and red) were fractionated by TLC into nine subfractions. The major components were TAGs (TAG: 43.8–45.7 wt%) and phospholipids (PL: 46.7–47.0 wt%), while other components were also present in minor proportions (0.3–2.7 wt%). The principal fatty acids (FA) are generally palmitic (18.8–28.8%), stearic (0.7–6.8%), oleic (42.0–51.8%), linoleic (16.2–22.8%), and α-linolenic (3.0–8.2%) acids, the distribution of which differs according to these lipid classes. There were no significant differences (p>0.05) in the positional distribution of FA in the TAG; unsaturated FA (97.5%) were predominantly concentrated in the sn-2 position while saturated FA (33.3%) primarily occupied the sn-1 position or sn-3 position. However, significant differences (p<0.05) in FA distribution existed when the individual PL were compared between the white and red beans. Based on the FA composition of these lipids, it seems that the two cultivars of Jack beans are very similar to each other with a few exceptions. The results could be useful to both producers and consumers for our daily diet to improve value of the Japanese diet. Practical applications: The lipid composition suggests that these beans could be a good source of nutraceuticals with providing heath benefits. The white and red beans may be well incorporated into our daily Japanese diets to improve nutritional value. The data obtained in this study provide valuable information for manufacturing functional drinks such as Jack bean tea in Japan.
    European Journal of Lipid Science and Technology 07/2012; 114(7). · 2.27 Impact Factor

Publication Stats

1k Citations
486.54 Total Impact Points

Institutions

  • 1992–2014
    • Kobe Gakuin University
      • • Faculty of Nutrition
      • • Faculty of Pharmaceutical Sciences
      Kōbe, Hyōgo, Japan
  • 2012
    • Ritsumeikan University
      • Department of Biomedical Sciences
      Kioto, Kyōto, Japan
  • 2009–2012
    • Kobe Pharmaceutical University
      Kōbe, Hyōgo, Japan
  • 2002–2012
    • Tokyo University of Science
      • Department of Applied Biological Science
      Tokyo, Tokyo-to, Japan
    • University of California, Berkeley
      • Department of Molecular and Cell Biology
      Berkeley, CA, United States
  • 2009–2011
    • Kyoto Prefectural University
      • Graduate School of Life and Environmental Sciences
      Kyoto, Kyoto-fu, Japan
  • 2008–2011
    • Kobe University
      • • Division of Gastroenterology
      • • Division of Radiology
      Kōbe, Hyōgo, Japan
  • 2008–2010
    • Hiroshima University
      • Graduate School of Education
      Hirosima, Hiroshima, Japan