Effects of bistheonellide A,an Actin-polymerization Inhibitor,on Chinese Hamster V79 Cells and on IL-8 Production in PMA-stimulated HL-60 Cells     

Taiko Oda  Jinzhong Xu  Ayako Fujita  Masataka Mochizuki  Michio Namikoshi 《Marine drugs》2006,4(1):22-27

Bioassay-guided isolation from the ethanol extract of a marine sponge Theonella sp. collected in Palau yielded bistheonellide A, which strongly inhibited the colony formation of Chinese hamster V79 cells (EC₅₀ = 6.8 nM). Bistheonellide A is an actin-polymerization inhibitor and was suggested to control cytokine production. Therefore, we attempted to detect an effect of this compound on IL-8 production in PMA-stimulated HL-60 cells. Interestingly, bistheonellide A did not modulate the production of IL-8 under cytotoxic concentrations as determined by LDH analysis. Although the correlation between the inhibition of microtubule assembly and the stimulation of IL-8 production has been observed for several compounds, the polymerization of actin was not related to an IL-8 production in the case of bistheonellide A. It will be suggested that the actin polymerization is not involved in the IL-8 production system.  相似文献   

Effects of Lissoclibadins and Lissoclinotoxins,Isolated from a Tropical Ascidian Lissoclinum cf. badium,on IL-8 production in a PMA-stimulated Promyelocytic Leukemia Cell Line     

Taiko Oda  Takeshi Fujiwara  Hongwei Liu  Kazuyo Ukai  Remy E. P. Mangindaan  Masataka Mochizuki  Michio Namikoshi 《Marine drugs》2006,4(1):15-21

The effects of seven compounds 1–7, isolated from a tropical ascidian Lissoclinum cf. badium, on IL-8 production in PMA-stimulated HL-60 cells were examined. Lissoclibadins 2 (2) and 3 (3) and lissoclinotoxin F (5) increased the IL-8 production in a dose-dependent manner. Compounds 2 and 5 are structural isomers possessing dimeric structures of trans and cis-orientations, respectively, and showed a very similar activity on the induction of IL-8 levels. Compound 3 and lissoclinotoxin E (4) are also structural isomers having dimeric trans and cis-structures, respectively, but 4 did not induce the IL-8 production. Lissoclibadin 1 (1, trimeric compound) and two monomeric compounds (6 and 7) did not increase the IL-8 level. Therefore, the differences in their structures remarkably affected the IL-8 production activity, the inhibition of cell proliferation, and the survival of HL-60 cells. Lissoclibadin 2 was the most interesting compound of the seven metabolites tested in this study.  相似文献   

Diel activity and vertical distribution of Lysianassoid amphipods dominant in Onagawa Bay, north-eastern Japan     

Atsushi  TAKEKAWA  Koichi  SASAKI  Michio  OMORI 《Fisheries Science》2004,70(6):971-977

ABSTRACT:   Baited traps were used over 24 h to reveal the diel activity and vertical distribution of three dominant lysianassoid amphipods ( Scopelocheirus onagawae , Anonyx omorii , Anonyx abei ) in Onagawa Bay, north-eastern Japan. The three species were the most dominant small crustacean scavengers in the bay. Most individuals were caught by traps deployed 0.3 m above the bottom, showing that they were active in the layers close to the sea bottom. No habitat segregation was found among species or developmental stages, suggesting that these scavengers rely on the food supply from bottom deposits. The three species increased remarkably in numbers of collected individuals at night, showing a rise in feeding activity. The two Anonyx species were collected only during the night, and S. onagawae was collected mostly during the night. The nocturnal activity appears to be an adaptation to reduce predation risks. However, juveniles of S. onagawae appeared even during the day, suggesting that feeding might take precedence over avoiding predation. Baited traps collected ovigerous females of S. onagawae but not of Anonyx species; the reason for the difference could not be determined.  相似文献   

Relationship between nitrogen and phosphate surplus from agricultural production and river water quality in two types of production structure   总被引：2，自引：0，他引：2  

Shin-Ichiro MISHIMA  Satoru TANIGUCHI  Kazunori KOHYAMA  Michio KOMADA 《Soil Science and Plant Nutrition》2007,53(3):318-327

  相似文献   

Effects of dietary supplementation with conjugated linoleic acid on fatty acid composition and lipid oxidation in chicken breast meat     

Satoshi KAWAHARA  Shin-ichi TAKENOYAMA  Kazuaki TAKUMA  Michio MUGURUMA  Kiyoshi YAMAUCHI 《Animal Science Journal》2009,80(4):468-474

We investigated the effects of dietary conjugated linoleic acid (CLA) on fatty acid composition and lipid oxidation in breast meat of broiler chickens. Broiler chickens (28-day-old females) were fed diets containing experimental oils at 20 g/kg diet for 28 days. The experimental oils consisted of either a 2:0, 1:1, or a 0:2 (wt : wt) ratio of safflower oil (high linoleic acid content) to a commercial CLA mixture. In this study, dietary CLA supplementation significantly increased the composition and content of CLA in chicken meat. The predominant CLA in meat from birds with supplemented diets was the cis -9, trans -11 isomer. The proportion of saturated fatty acid in meat significantly increased with increasing CLA supplementation, with a corresponding decrease in monounsaturated fatty acid. Dietary CLA also reduced thiobarbituric acid reactive substances (TBARS) values in raw meat during storage at 4°C for 5 days. These results provide evidence that CLA feeding is a practical strategy not only for adding nutritional benefits to chicken meat but also for improving meat quality including oxidative stability.  相似文献   

Interspecific variation in vessel size, growth and drought tolerance of broad-leaved trees in semi-arid regions of Kenya     

Kondoh S  Yahata H  Nakashizuka T  Kondoh M 《Tree physiology》2006,26(7):899-904

In semi-arid regions, trees often wither during the dry season. Withering is sometimes manifest as die-back, whereby whithering results in shoot death, which progresses downward from the uppermost part of the crown. In this study, we measured the relationships between height growth and diameter at breast height, die-back frequency and severity, vessel size and specific hydraulic conductivity of four evergreen (Senna siamea (Lamk) H.S. Irwin & Barneby, Jacaranda mimosifolia D. Don, Azadirachta indica A.H.L. Juss and Acacia gerrardii Benth.) and one deciduous (Melia volkensii Gürke) plantation tree species in Kenya, which has a conspicuous dry season. Die-back occurred readily in some species, but not in others. Senna siamea showed the highest specific hydraulic conductivity and the highest growth rate among the five species and was quite susceptible to die-back. Among species, height growth and specific hydraulic conductivity were positively correlated with vessel size and negatively correlated with die-back frequency, suggesting a trade-off between growth rate and drought tolerance. This implies that an adaptation to rapid growth under humid conditions leads to low drought tolerance. However, the deciduous tree Melia volkensii showed high specific hydraulic conductivity and growth, with no symptoms of die-back, implying that a mechanism associated with the deciduous habit results in drought avoidance by reducing the requirement for water during the dry season.  相似文献   

Porcine skeletal muscle troponin is a good source of peptides with Angiotensin-I converting enzyme inhibitory activity and antihypertensive effects in spontaneously hypertensive rats     

Katayama K  Anggraeni HE  Mori T  Ahhmed AM  Kawahara S  Sugiyama M  Nakayama T  Maruyama M  Muguruma M 《Journal of agricultural and food chemistry》2008,56(2):355-360

In the search for novel peptides that inhibit the angiotensin I-converting enzyme (ACE), porcine skeletal troponin was hydrolyzed with pepsin, and the products were subjected to various types of chromatography to isolate active peptides. Glu-Lys-Glu-Arg-Glu-Arg-Gln (EKERERQ) and Lys-Arg-Gln-Lys-Tyr-Asp-Ile (KRQKYDI) were identified as active peptides, and their 50% inhibitory concentrations were found to be 552.5 and 26.2 microM, respectively. These are novel ACE inhibitory peptides, and the activity of KRQKYDI was the strongest among previously reported troponin-originated peptides. KRQKYDI was slowly hydrolyzed by treatment with ACE, and kinetic studies indicated that this peptide was a competitive inhibitor of the enzyme. When KRQKYDI was administered orally to spontaneously hypertensive rats (SHR) at a dose of 10 mg/kg, a temporary antihypertensive activity was observed at 3 and 6 h after administration.  相似文献   

An evaluation of radiographic hepatic size in dogs with portosystemic shunt     

Washizu M  Katagi M  Washizu T  Torisu S  Kondo Y  Nojiri A 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(8):977-978

Radiographically, the hepatic sizes of portosystemic shunt (PSS) cases were evaluated. In this study the hepatic area was compared in PSS and non-PSS dogs by utilizing the right lateral radiography. The top three breeds of PSS dogs of Maltese, Shih Tzu and Yorkshire Terrier, were included and these dogs had a significantly smaller hepatic area ratio of 46.37 +/- 0.63%, 61.76 +/- 0.78% and 41.59 +/- 0.23% respectively (p<0.05) and the average overall hepatic area in the 3 dog breeds was 47.75 +/- 0.40%.  相似文献   

Kinetics of glutamate and gamma-aminobutyric acid in cerebrospinal fluid in a canine model of complex partial status epilepticus induced by kainic acid     

Hasegawa D  Matsuki N  Fujita M  Ono K  Orima H 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2004,66(12):1555-1559

An imbalance of excitatory and inhibitory transmitters in the brain has been suggested to cause epileptic seizures. In this study, we investigated the kinetics of glutamate (GLU) and gamma-aminobutyric acid (GABA) in cerebrospinal fluid (CSF-GLU and CSF-GABA, respectively) using a high performance liquid chromatography (HPLC) in a canine model of complex partial status epilepticus (CPSE) induced by the microinjection of kainic acid (KA) into the unilateral amygdala. During the acute phase (3, 6, 12 and 48 hr after the onset of CPSE), CSF-GLU was significantly increased, while CSF-GABA was decreased, although not significantly. In the chronic phase, both CSF-GLU and CSF-GABA were significantly lower than normal at 72 hr after the onset of CPSE, and their levels returned to normal at 2 months. Results of the present study demonstrate that CSF-GLU is gradually increased in relation with seizure severity, and suggested the possibility that CSF-GABA was consistently decreased during CPSE induced by KA in dogs.  相似文献   

Priming abiotic factors for optimal hybrid Cymbidium (Orchidaceae) PLB and callus induction,plantlet formation,and their subsequent cytogenetic stability analysis     

Jaime A. Teixeira da Silva  Ming-Tsair Chan  Sanjaya  Ming-Liang Chai  Michio Tanaka 《Scientia Horticulturae》2006

Abiotic factors affect the induction of PLBs and callus in hybrid Cymbidium Twilight Moon ‘Day Light’. The initiation and proliferation of new PLBs and callus could be achieved on NAA and kinetin, supplemented at 0.1 mg l⁻¹ each, respectively, both within 45–60 days. Bacto agar was found to be the most suitable solidifying agent for PLB induction, although a higher shoot fresh weight was obtained on Gelrite; a pH 5.3 was optimal while pH 4.5 caused 100% explant necrosis; coconut water, when supplied at 10–20% (v/v) resulted in a significant increase in the number of PLBs formed per PLB segment (23.1 versus 14.6 in controls) while a massive (almost four-fold) increase in fresh top weight occurred when PLB explants were placed in liquid culture, as a result of hyperhydricity; Fe-EDTA (1 mg l⁻¹) and activated charcoal (1 g l⁻¹) stimulated total fresh weight and PLB formation in the presence of PGRs; PLB formation decreased but total fresh shoot weight increased with the addition of niacin or myo-inositol, both vitamins. Dark-grown PLB-induced plants were etiolated and had longer internodes and higher fresh weight than light-grown control plants at 45 μmol m⁻² s⁻¹; at 15 μmol m⁻² s⁻¹ shoots were slightly etiolated, fragile, and PLB formation was scarce. RAPD and mtDNA analysis of all resultant PLBs, callus or plants showed them to be genetically identical, with comparable chlorophyll contents. Despite the detection of cytological variation between different plant parts, little variation resulted from abiotic factor treatment.  相似文献