Efficacy of yeast phytase in improving phosphorus bioavailability in a corn-soybean meal-based diet for growing pigs   总被引：2，自引：0，他引：2  

Matsui T  Nakagawa Y  Tamura A  Watanabe C  Fujita K  Nakajima T  Yano H 《Journal of animal science》2000,78(1):94-99

Crossbred barrows (n = 66; 6 wk old) were used in a 6-wk experiment to evaluate the efficacy of phytase from yeast or Aspergillus niger on performance, tibial characteristics, and serum inorganic P concentration. We also investigated the stability of these phytases in acidic solutions with pepsin, which simulated gastric conditions. Pigs were fed a P-adequate diet containing .34% nonphytate-P or a low-P diet containing .20% nonphytate-P. The low-P diet was supplemented with 0, 1,000, 2,000, or 4,000 phytase units (PU; the activity at optimal pH, i.e., pH 4.2 for yeast phytase and pH 5.5 for phytase from Aspergillus niger)/kg of yeast phytase, or 1,000 PU/kg phytase from Aspergillus niger. The graded level of yeast phytase linearly increased ADG (P = .047), tibial weight (P = .091), tibial density (P < .001), and P concentration in tibial cortex (P = .018). Aspergillus niger phytase also increased ADG (P = .022), serum inorganic P concentration (P < .001), tibial density (P = .007), and tibial P concentration (P = .025). The pigs given 1,000 PU/kg Aspergillus niger phytase showed greater ADG (P = .091), tibial density (P= .001), and tibial P concentration (P = .062) than those given 1,000 PU/kg yeast phytase. No measurements differed (P > .31) between the pigs given 1,000 PU/kg Aspergillus niger phytase and those given 4,000 PU/kg yeast phytase. These results suggested that yeast phytase improves bioavailability of P in the diet for growing pigs but the efficacy of yeast phytase is less than that of Aspergillus niger phytase. During incubation in acidic solutions with pepsin, yeast phytase (P < .001) lost more of its activity than Aspergillus niger phytase. This lesser stability of yeast phytase may be responsible for the poorer efficacy of yeast phytase than that of Aspergillus niger. In summary, supplementation of swine diets with yeast phytase is beneficial, but its efficacy is less than that of Aspergillus niger phytase.  相似文献   

Effect of stereo-configurational difference of carbohydrate model compound on the reaction with active oxygen species under oxygen delignification conditions     

Akihiko Nakagawa  Tomoya Yokoyama  Yuji Matsumoto 《Journal of Wood Science》2015,61(5):510-516

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Inflammatory cytokines induce a reduction in E-cadherin expression and morphological changes in MDCK cells     

Tomochika Saito  Kota YoshidaKaori Matsumoto  Kohei SaekiYuiko Tanaka  Siew-Mei OngNobuo Sasaki  Ryohei NishimuraTakayuki Nakagawa 《Research in veterinary science》2014

Epithelial–mesenchymal transition (EMT) is a fundamental phenomenon in organisms that occurs during gastrulation, wound healing, and cancer metastasis. Various cytokines induce EMT processes through complex mechanisms. Inflammatory cytokines, such as tumor necrosis factor alpha (TNF-α) and interleukin 6 (IL-6), induce EMT in human cell lines. However, whether inflammatory cytokines can affect EMT processes in canine cell lines remains unclear. In this study, we investigated the role of transforming growth factor beta (TGF-β), TNF-α, and IL-6 in Madin-Darby canine kidney (MDCK) cells. We found that the localization of E-cadherin, a cell adhesion molecule, was shifted and that its expression was decreased. We also observed morphological changes in MDCK cells under persistent stimulation of inflammatory cytokines. Morphological changes in cells may occur during late stages of EMT processes; inflammatory cytokines may be important in these changes.  相似文献   

Effect of Leukemia Inhibitory Factor and Forskolin on Establishment of Rat Embryonic Stem Cell Lines     

Masumi HIRABAYASHI  Teppei GOTO  Chihiro TAMURA  Makoto SANBO  Hiromasa HARA  Shinichi HOCHI 《The Journal of reproduction and development》2014,60(1):78-82

This study was designed to investigate whether supplementation of 2i medium with leukemia inhibitory factor (LIF) and/or forskolin would support establishment of germline-competent rat embryonic stem (ES) cell lines. Due to the higher likelihood of outgrowth rates, supplementation of forskolin with or without LIF contributed to the higher establishment efficiency of ES cell lines in the WDB strain. Germline transmission competency of the chimeric rats was not influenced by the profile of ES cell lines until their establishment. When the LIF/forskolin-supplemented 2i medium was used, the rat strain used as the blastocyst donor, such as the WI strain, was a possible factor negatively influencing the establishment efficiency of ES cell lines. Once ES cell lines were established, all lines were found to be germline-competent by a progeny test in chimeric rats. In conclusion, both LIF and forskolin are not essential but can play a beneficial role in the establishment of “genuine” rat ES cell lines.  相似文献   

The Effects of Calcitonin on the Development of and Ca2+ Levels in Heat-shocked Bovine Preimplantation Embryos In Vitro     

Shumpei KAMANO  Shuntaro IKEDA  Miki SUGIMOTO  Shinichi KUME 《The Journal of reproduction and development》2014,60(4):317-323

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Influences of protein ingestion on glucagon‐like peptide (GLP)‐1‐immunoreactive endocrine cells in the chicken ileum     

Mohammad M. Monir  Kohzy Hiramatsu  Sachiko Matsumoto  Kei Nishimura  Chihiro Takemoto  Tomomi Shioji  Takafumi Watanabe  Kazumi Kita  Shinichi Yonekura  Sang Gun Roh 《Animal Science Journal》2014,85(5):581-587

Influences of a specific dietary nutrient on glucagon‐like peptide (GLP)‐1‐containing cells in the chicken intestine are not yet clear. Significance of dietary protein level on GLP‐1‐containing cells in the chicken ileum was investigated. Chickens fed control or experimental diets of varying protein levels were examined using immunohistochemical and morphometrical techniques. We show that the protein ingestion had an impact on the activities of GLP‐1‐immunoreactive cells in the chicken ileum. Weight gains declined with decreasing dietary crude protein (CP) levels, but no significant differences were detected in the daily feed intake and villous height. GLP‐1‐immunoreactive cells with a round or oval shape were frequently observed in the lower CP level groups (4.5% and 0%). Frequencies of occurrence of GLP‐1‐immunoreactive cells were 41.1 ± 4.1, 38.5 ± 4, 34.8 ± 3.1 and 34.3 ± 3.7 (cells/mm², mean ± SD) for dietary CP level of 18%, 9%, 4.5% and 0% groups, respectively and significant differences were recognized between the control and lower CP level groups (P < 0.05). Multiple regression analysis indicated a significant correlation between the daily protein intake and frequencies of occurrence of GLP‐1‐immunoreactive cells. The protein ingestion is one of the signals that influence GLP‐1‐containing cells in the chicken small intestine.  相似文献   

Insect sex-pheromone signals mediated by specific combinations of olfactory receptors   总被引：4，自引：0，他引：4  

Nakagawa T  Sakurai T  Nishioka T  Touhara K 《Science (New York, N.Y.)》2005,307(5715):1638-1642

We describe two male-specific olfactory receptors (ORs) in the silk moth, Bombyx mori, that are mutually exclusively expressed in a pair of adjacent pheromone-sensitive neurons of male antennae: One is specifically tuned to bombykol, the sex pheromone, and the other to bombykal, its oxidized form. Both pheromone ORs are coexpressed with an OR from the highly conserved insect OR subfamily. This coexpression promotes the functional expression of pheromone receptors and confers ligand-stimulated nonselective cation channel activity. The same effects were also observed for general ORs. Both odorant and pheromone signaling pathways are mediated by means of a common mechanism in insects.  相似文献   

The structure of importin-beta bound to SREBP-2: nuclear import of a transcription factor     

Lee SJ  Sekimoto T  Yamashita E  Nagoshi E  Nakagawa A  Imamoto N  Yoshimura M  Sakai H  Chong KT  Tsukihara T  Yoneda Y 《Science (New York, N.Y.)》2003,302(5650):1571-1575

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Dietary Bacillus subtilis C-3102 Supplementation Enhances the Exclusion of Salmonella enterica from Chickens     

Toki Nishiyama  Nobuhisa Ashida  Koichi Nakagawa  Shun Iwatani  Naoyuki Yamamoto 《The Journal of Poultry Science》2021,58(2):138

Among the reported probiotic Bacillus strains, B. subtilis C-3102 has the unique potential to improve feed uptake under stress conditions in the broilers, piglets, and cows. In this study, we sought to evaluate the protective effect of feed additive probiotic Bacillus subtilis C-3102 against Salmonella enterica infection of specific pathogen-free (SPF) chicks in floor pens in two experiments. In the experiment-1, the chicks in the control group (n=32) were fed a basal diet and those in the C-3102 group (n=32) were fed a basal diet supplemented with 1×10⁶ CFU/g of feed for 28 days. On day 7 post-challenge with S. enterica, there was no significant change in the body weight between both the groups throughout the test period, whereas detection rates of S. enterica in the C-3102 group were significantly lower in the cecum and liver on days 21 and 14 post-challenge, respectively. In the experiment-2, minimum dosage of C-3102 cells required to protect Salmonella infection was evaluated using 3 dosages. Chicks were divided into four groups, fed with different dosages of C-3102 (1×10⁶, 5×10⁵, 3×10⁵, and 0 CFU/g of feed), and challenged with S. enterica (2.8×10⁸ CFU/chicken). S. enterica infection was completed within 7 days post- challenge and was almost excluded from the liver and spleen on day 21 post- challenge in the control group. Average values showed a trend for higher infection rates in the control group >3×10⁵>5×10⁵>1×10⁶ CFU/g on days 14 and 21 post-challenge. These results suggest that B. subtilis C-3102 supplementation has the potential to reduce S. enterica infection rates and/or to accelerate the exclusion of S. enterica from the chicks.  相似文献   

Determination of 1-deoxynojirimycin in mulberry leaves using hydrophilic interaction chromatography with evaporative light scattering detection   总被引：9，自引：0，他引：9  

Kimura T  Nakagawa K  Saito Y  Yamagishi K  Suzuki M  Yamaki K  Shinmoto H  Miyazawa T 《Journal of agricultural and food chemistry》2004,52(6):1415-1418

A simple and rapid method for determining 1-deoxynojirimycin (DNJ), a potent glucosidase inihibitor present in mulberry leaves (Morus alba and Morus bombysis), by high-performance liquid chromatography coupled to an evaporative light scattering detector (ELSD) has been developed. DNJ was separated from an extract of mulberry leaves on a TSKgel Amide-80 column, which is a representative column for hydrophilic interaction chromatography. During postcolumn detection, DNJ was detected by ELSD and concurrently identified by mass spectrometry. The detection limit was 100 ng. This method is sufficiently sensitive for determining DNJ in mulberry leaves and other related products.  相似文献