玖村 朗人 (クムラ ハルト)

北方生物圏フィールド科学センター教授

研究者基本情報

■ 学位
  • 博士(農学), 北海道大学
■ URL
researchmap URLホームページURL■ ID 各種
J-Global ID■ 研究キーワード・分野
研究キーワード
  • 微生物
  • 食品
研究分野
  • ライフサイエンス, 食品科学
■ 担当教育組織

研究活動情報

■ 論文
  • Maintaining a neutral range disperses myosin molecules under salt-free conditions.
    Toru Hayakawa; Yu Shishido; Yuki Ikeuchi; Jun-Ichi Wakamatsu; Haruto Kumura
    Journal of biochemistry, 178, 3, 209, 215, 2025年09月03日, [国際誌]
    英語, 研究論文(学術雑誌), Skeletal muscle myosin is generally considered insoluble under physiological, low ionic strength, or salt-free conditions due to its tendency to self-assemble into filamentous polymers in vitro. Our previous study showed that myosin can be solubilized in low ionic strength solutions containing l-histidine. However, another report suggested that 1-methylhistidine could not solubilize myosin, and the factors essential for myosin solubilization remain unclear. To elucidate the role of l-histidine in the water solubilization of myosin, we examined myosin solubility and the molecular properties of its rod domain, l-meromyosin, using structurally related buffer compounds. Under salt-free conditions, solubility depended heavily on the acid dissociation constant of buffer, indicating that maintaining a neutral pH is critical. The rod domain showed molecular elongation regardless of the buffer type, yet surface charge and hydrophobicity remained comparable to conditions with high ionic strength. These results suggest that myosin is inherently soluble and maintains its structural integrity under neutral, salt-free conditions. The apparent insolubility under such conditions is likely to result from hydrochloric acid used for pH adjustment. Since l-histidine and imidazole achieve neutrality without acid addition, they are ideal buffers for myosin solubilization.
  • Evaluation of postprandial thermal feeling in mice using a behavioral thermoregulation analysis: Differences in meat species and their fractions
    Jun-ichi Wakamatsu; Yeying Tan; Seiya Kato; Haruka Abe; Manabu Kawahara; Toru Hayakawa; Haruto Kumura
    Journal of Thermal Biology, 129, 104101, 104101, Elsevier BV, 2025年04月
    研究論文(学術雑誌)
  • Application of glucose to prepare Aspergillus oryzae koji as an adjunct to prevent rancidity in cheese products.
    Napaporn Chintagavongse; Tomohiro Mitani; Koichi Tamano; Toru Hayakawa; Jun-Ichi Wakamatsu; Haruto Kumura
    Bioscience, biotechnology, and biochemistry, 2024年11月28日, [国際誌]
    英語, 研究論文(学術雑誌), Koji made using Aspergillus oryzae shows potential for application as a cheese adjunct; however, flavor defects resulting from volatile free fatty acid (FFA) accumulation should be avoided. Hence, a modified glucose-containing whey solid medium was used to culture A. oryzae AHU 7139, and the triacylglycerol (TG) lipase activity and lipase gene (tglA and mdlB) expression were compared with those of a culture using a conventional whey solid medium. The results showed that TG lipase activity and the expression of both lipase genes were reduced in the modified medium. Moreover, the expression level of farA, a positive transcription factor of the lipase genes, was also reduced. The cheese adjunct prepared by culturing the AHU 7139 strain in the modified medium lowered the FFA content in the cheese products, resulting in comparable FFA levels with those in the adjunct-free cheese. Thus, adding glucose is recommended to prepare the koji adjunct for cheesemaking.
  • Identification of cheese rancidity-related lipases in Aspergillus oryzae AHU 7139.
    Napaporn Chintagavongse; Haruto Kumura; Toru Hayakawa; Jun-Ichi Wakamatsu; Koichi Tamano
    Journal of bioscience and bioengineering, 2024年03月01日, [国内誌]
    英語, 研究論文(学術雑誌), The adjunct product with enzymatic activity from Aspergillus oryzae is beneficial for flavor enrichment in the ripened cheese. However, an excessive lipolytic reaction leads to the release of volatile free fatty acids. Accordingly, a strong off-flavor (i.e., rancidity) has been detected when A. oryzae AHU 7139 is used. To identify the rancidity-related lipase from this strain, we evaluated the substrate specificity and lipase distribution using five mutants cultured on a whey-based solid medium under different initial pH conditions. The results showed a higher diacylglycerol lipase activity than triacylglycerol lipase activity. Moreover, an initial pH of 6.5 for the culture resulted in higher lipolytic activity than a pH of 4.0, and most of the activity was found in the extracellular fraction. Based on the gene expression analysis by real-time polymerase chain reaction and location and substrate specificity, five genes (No. 1, No. 19, mdlB, tglA, and cutL) were selected among 25 annotated lipase genes to identify the respective knockout strains. Because ΔtglA and ΔmdlB showed an outstanding involvement in the release of free fatty acids, these strains were applied to in vitro cheese curd experiments. In conclusion, we posit that triacylglycerol lipase (TglA) plays a key role as the trigger of rancidity and the resulting diglycerides have to be exposed to diacylglycerol lipase (MdlB) to stimulate rancidity in cheese made with A. oryzae AHU 7139. This finding could help screen suitable A.oryzae strains as cheese adjuncts to prevent the generation of the rancid-off flavor.
  • Water extractability of the zinc protoporphyrin IX-myoglobin complex from Parma ham is pH-dependent.
    Haruka Abe; Yang Zhai; Yu Toba; Hiroki Masumo; Toru Hayakawa; Haruto Kumura; Jun-Ichi Wakamatsu
    Food chemistry, 441, 138317, 138317, 2024年01月02日, [国際誌]
    英語, 研究論文(学術雑誌), The bright red color of Parma ham is mainly derived from zinc protoporphyrin IX (ZnPP), which exists in both water-soluble and insoluble states. Water-soluble ZnPP mainly binds to hemoglobin, however, the presence of water-insoluble ZnPP remains unexplained. Therefore, we aimed to elucidate how ZnPP exists in a water-insoluble state by focusing on its binding substance. Depending on the skeletal muscle, water-insoluble ZnPP comprised 30-50% of total ZnPP. The ZnPP water extractability was positively correlated with muscle pH. Water-insoluble ZnPP was extractable with a high-pH solution and existed as a complex with myoglobin or hemoglobin; nevertheless, myoglobin-binding ZnPP was more abundant. Furthermore, the water solubility of the myoglobin globin moiety at pH 5.5-6.0 was reduced by ZnPP binding. These results suggest that water-insoluble ZnPP mainly exists as a ZnPP-Mb complex, with low solubility attributed to the low pH of the ham.
  • Dissociation of ferriheme from oxidized heme proteins and re-reduction of ferriheme to ferroheme are crucial for the formation of zinc protoporphyrin IX in nitrite/nitrate-free dry-cured meat products.
    Yang Zhai; Haruka Abe; Hung-Cheng Wang; Toru Hayakawa; Haruto Kumura; Jun-Ichi Wakamatsu
    Food chemistry, 427, 136755, 136755, 2023年11月30日, [国際誌]
    英語, 研究論文(学術雑誌), Zinc protoporphyrin IX (ZnPP) is the dominant red pigment in nitrate/nitrite-free dry-cured meat products such as Parma ham, and it is considered to be a potential alternative to nitrite/nitrate for reddening dry-cured meat products. Ferroheme and ferriheme dissociated from heme proteins in meat were proposed as substrates to form ZnPP. To elucidate their specific formation mechanism, nitric oxide, carbon monoxide, and azide were used to stable heme in heme proteins. The exogenous hemoglobin derivatives bound with these ligands showed lower heme dissociation compared with exogenous oxyhemoglobin and did not contribute to ZnPP formation. Meanwhile, azide inhibited almost all ZnPP formation by binding to ferriheme, indicating ferriheme dissociation from oxidized heme proteins, predominantly for ZnPP formation. Free ferriheme could not be converted to ZnPP unless it was reduced to ferroheme. Overall, ferriheme dissociated from oxidized heme proteins was the dominant substrate for conversion to ZnPP after re-reduction to ferroheme.
  • Supplementary effect of whey components on the monascin productivity of Monascus sp.
    Qingyun Huang; Nodoka Miyaki; Zongfei Li; Yutaroh Takahashi; Satoshi Ishizuka; Toru Hayakawa; Jun-Ichi Wakamatsu; Haruto Kumura
    Journal of the science of food and agriculture, 103, 8, 4234, 4241, 2023年06月, [国際誌]
    英語, 研究論文(学術雑誌), BACKGROUND: Monascus sp. has been used in fermented foods for centuries. It can synthesize yellow, red, and orange pigments as secondary metabolites. Here, we focused on yellow pigment monascin, responsible for anti-inflammation and antidiabetic effects, and investigated whether whey could be a suitable substrate with or without rice powder for monascin production using M. purpureus AHU 9085, M. pilosus NBRC 4520 and M. ruber NBRC 32318. RESULTS: The growth and monascin production of the three Monascus strains were dependent on three liquid media consisting of whey and/or rice. All strains showed the best growth in a rice and whey mixed medium, in which M. ruber NBRC 32318 exhibited the highest total monascin production. Subsequent investigation of the effects of whey components indicated that a mineral cocktail in whey was particularly effective in stimulating the monascin production efficiency of M. ruber NBRC 32318. However, this recipe exhibited less stimulation, or even inhibition, for M. pilosus NBRC 4520 and M. purpureus AHU 9085, respectively. In terms of total monascin production, rice with whey provided the highest amount due to growth promotion along with relatively high production efficiency. CONCLUSION: The effect of whey on growth and monascin production was strongly dependent on the Monascus strains. Even a mineral cocktail in whey could regulate monascin productivity in a strain-specific manner. Further studies are needed to elucidate the mechanism behind the diverse responses by the minerals in the production of monascin from Monascus. © 2023 Society of Chemical Industry.
  • L‐histidine inhibits the heat‐induced gelation of actomyosin in a low ionic strength solution
    Toru Hayakawa; Yu Kubono; Shuji Fujii; Jun‐ichi Wakamatsu; Haruto Kumura
    Animal Science Journal, 94, 1, Wiley, 2023年01月
    研究論文(学術雑誌)
  • Zinc protoporphyrin IX predominantly exists as a complex non-enzymatically bound to apo-hemoglobin in Parma ham.
    Yang Zhai; Hung-Cheng Wang; Toru Hayakawa; Haruto Kumura; Jun-Ichi Wakamatsu
    Food chemistry, 395, 133604, 133604, 2022年11月30日, [国際誌]
    英語, 研究論文(学術雑誌), Most of the water-soluble zinc protoporphyrin IX (ZnPP) in Parma ham mainly exists as complexes with hemoglobin and myoglobin (ZnPP-Hb and ZnPP-Mb). To elucidate the formation mechanism of these complexes, a new experimental model to produce higher amount of water-soluble ZnPP complexes was established. ZnPP-Hb was detected as the main water-soluble ZnPP complex in this model, which is the same as that in Parma ham. Adding exogenous Hb into this model promoted higher ZnPP formation than with Mb added, indicating that Hb was the superior substrate for generating ZnPP compared to Mb. The increase in non-heme iron content with ZnPP formation in both the Hb- and Mb-added groups indicated that the release of iron ion from heme was a crucial step in ZnPP formation. ZnPP-Hb was formed when ZnPP non-enzymatically bound with apo-Hb. These results revealed the mechanism of why ZnPP-Hb is more dominant in Parma ham than to ZnPP-Mb.
  • A study of lipolysis induced by adjuncts from edible Aspergillus sp. solid culture products on ripened semi-hard cheese.
    Napaporn Chintagavongse; Hayate Takiguchi; Chi Ming-Hsuan; Koichi Tamano; Toru Hayakawa; Jun-Ichi Wakamatsu; Tomohiro Mitani; Haruto Kumura
    Journal of the science of food and agriculture, 2022年01月23日, [国際誌]
    英語, 研究論文(学術雑誌), BACKGROUND: Aspergillus sp. has been used in traditional Japanese fermented foods. Protease-containing culture products of A. oryzae have been applied as the adjunct enzyme source to enrich the flavor in ripened cheese. Although proteolysis was stimulated, the increase of free fatty acids (FFA) was recognized in some products. Since an excess amount of FFA accumulation can cause rancidity in cheese products, the assessment of lipase activity was considered to be essential for the cheese adjunct preparation. RESULTS: Although an equal lipase activity from the adjunct materials of A. kawachii NBRC 4308, A. luchuensis RIB 2604 and A. oryzae AHU 7139 was applied to semi-hard cheese, the FFA level was significantly higher in A. oryzae cheese than in the others. Furthermore, the profiles of volatile components were different in experimental cheeses. An in vitro study with experimental curds demonstrated that the high FFA might not depend on the lipase retainability on curds. On the contrary, the pronounced activation of the lipases occurred in A. oryzae after incubation with the curds. Moreover, incubation of the insoluble lipase that had been attached to the cells with skim milk curd extracts allowed the release of lipases from the cells into the medium with remarkable activation. CONCLUSION: A. oryzae AHU 7139 possessed a complex lipolytic system comprising extracellular and cell-binding lipases that were attributed to the increase in FFA in A. oryzae cheese. © 2022 Society of Chemical Industry.
  • High ZnPP-forming food-grade lactic acid bacteria as a potential substitute for nitrite/nitrate to improve the color of meat products
    Md. Kauser-Ul-Alam; Toru Hayakawa; Haruto Kumura; Jun-ichi Wakamatsu
    Meat Science, 176, 108467, 108467, Elsevier BV, 2021年06月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Zinc protoporphyrin IX (ZnPP)-forming food-grade lactic acid bacteria (LAB) were screened from various sources for their ability to improve the color of meat products. The effects of salt and nitrite on the ZnPP-forming ability of these bacteria were also investigated. Finally, these bacteria were applied in salt-added minced meat to assess their ability to improve the color. Twenty-five LAB were screened for their ZnPP-forming ability in pork. Most of the strains exhibited maximum growth anaerobically in 3% salt at 30 °C and grew well at pH 5.5 and 6.5. Moreover, 3% salt slightly retarded ZnPP formation; however, nitrite completely inhibited ZnPP formation in all the ZnPP-forming LAB. Thirteen LAB (avoiding duplication and non-food-grade) could form ZnPP in salt-added minced meat, resulting in improvement of the bright red color, high ZnPP autofluorescence, and increased fluorescence intensity. Finally, considering the safety, Lactobacillus plantarum, Lactococcus lactis subsp. cremoris, and Leuconostoc lactis were suggested as promising candidates to improve the color of meat products.
  • Water-extractable zinc protoporphyrin IX in Parma ham predominantly exists as complexes with hemoglobin and myoglobin
    Hung-Cheng Wang; Toru Hayakawa; Haruto Kumura; Jun-ichi Wakamatsu
    Food Bioscience, 40, 100870, 100870, Elsevier BV, 2021年04月, [査読有り]
    研究論文(学術雑誌)
  • 鉄,亜鉛およびポルフィリンの推移からみた食肉中の亜鉛プロトポルフィリンIX形成機構
    Nihon Chikusan Gakkaiho, 91, 4, 389, 394, Japanese Society of Animal Science, 2020年11月25日, [査読有り]
    研究論文(学術雑誌)
  • Lactococcus lactis subsp. cremoris Produces Zinc Protoporphyrin IX Both Aerobically and Anaerobically and Improves the Bright Red Color of Fermented Meat Products
    Md. Kauser-Ul-Alam; Yu Toba; Shoji Hioki; Toru Hayakawa; Haruto Kumura; Jun-ichi Wakamatsu
    Foods, 9, 11, 1583, 1583, MDPI AG, 2020年10月31日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), This study assessed the color improvement via zinc protoporphyrin IX (ZnPP) formation in nitrite-free, dry-cured sausages processed using five varieties of ZnPP-forming lactic acid bacteria (LAB). The ZnPP contents and color intensity of the sausages and other technological properties were analyzed during the processing of sausages. LAB count and acidity significantly increased in the LAB-inoculated sausages compared to the control group. The bright red color was observed both inside and outside the sausages inoculated with Lactococcus lactis subsp. cremoris and Leuconostoc lactis. However, a brown color was observed on the surface of the sausage inoculated with Lactobacillus spp. The redness of Lactococcus lactis subsp. cremoris-inoculated sausages was close to that of the nitrite-added group. Moreover, the external bright red color was improved by Lactococcus lactis subsp. cremoris due to the aerobic formation of ZnPP. Therefore, Lactococcus lactis subsp. cremoris can be used to improve the color of fermented meat products.
  • Searching for high ZnPP-forming edible bacteria to improve the color of fermented meat products without nitrite/nitrate
    Md Asaduzzaman; Momo Ohya; Haruto Kumura; Toru Hayakawa; Jun-ichi Wakamatsu
    Meat Science, 165, 108109, 108109, Elsevier BV, 2020年07月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), In order to improve the color of meat products by producing zinc protoporphyrin IX (ZnPP) in meat, we searched for edible bacteria with high ZnPP-forming ability. Eleven bacteria used in different animal products and 126 bacteria isolated from environmental and probiotic sources were assessed for their ability to form ZnPP. Many bacteria from both sources showed a high ZnPP-forming ability. Only three edible bacteria were identified from the 44 high ZnPP-forming isolates with 16S rRNA gene sequencing. High ZnPP-forming bacteria from both sources were inoculated in aseptic salt-added minced meat, and their ZnPP-forming abilities were evaluated. Lactococcus lactis, Leuconostoc mesenteroides, and Enterococcus faecium from environmental isolates produced a brighter red color, higher ZnPP autofluorescence and fluorescence intensity in salt-added minced meat than control. Furthermore, after heating, the color and ZnPP autofluorescence of the inoculated minced meat persisted to a degree. Therefore, it is possible to improve the color of meat products without nitrite/nitrate by using these promising ZnPP-forming edible bacteria.
  • Attempt at the adjunctive use of solid-state culture products and its freeze-dried powder from Aspergillus sojae for semihard cheese.
    Napaporn Chintagavongse; Tomoki Yoneda; Chi Ming-Hsuan; Toru Hayakawa; Jun-Ichi Wakamatsu; Koichi Tamano; Haruto Kumura
    Journal of the science of food and agriculture, 100, 13, 4834, 4839, 2020年06月01日, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), BACKGROUND: Some species belonging to the genus Aspergillus have been used in traditional Japanese fermentation foods. A. sojae is the species responsible for high proteolytic activity. Freeze-drying treatments followed by physical disruption enables the pulverisation of mycelia of A. sojae RIB 1045 grown in whey protein base solid media. Through this protocol, intracellular proteases were extracted to compare extracellular protease activity in terms of the reaction pH dependence in the presence or absence of the inhibitors. RESULT: With different sensitivities to inhibitors, intracellular and extracellular proteases showed the highest activity under the acidic region, which was considered suitable for cheese application. The raw culture product (CP) and its freeze-dried product (FDP) were mixed with cheese curds prepared according to Gouda-type cheese making and were allowed to ripen for three months. Chemical analysis of the products showed 13.3% water-soluble nitrogen (WSN) in the control, which had received noncultured media, whereas 20.0% and 21.1% WSN were found in CP and FDP experimental cheese, respectively. Although these adjuncts significantly increased WSN, an insignificant difference was found between CP and FDP. Free fatty acids in all experimental cheeses were similar, showing that CP and FDP caused no rancid defects. CONCLUSION: An introduction of freeze-drying treatments accompanied by cell disruption resulted in a negligible effect in terms of WSN. However, the application of A. sojae can be beneficial when it comes to increasing the degree of WSN compared with A. oryzae, as shown in our previous study. This article is protected by copyright. All rights reserved.
  • Improving the color of meat products without adding nitrite/nitrate using high zinc protoporphyrin IX-forming microorganisms.
    Wakamatsu JI; Kawazoe H; Ohya M; Hayakawa T; Kumura H
    Meat science, 161, 107989, 107989, 2019年10月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), Zinc protoporphyrin IX (ZnPP) mainly contributes to the red color of dry cured ham without nitrites/nitrates. Here, we examined the effects of acids used for pH adjustment, pH, and microorganisms on ZnPP formation. The results showed that ZnPP formation and optimal pH were dependent upon the acid type. In the presence of microorganisms, the optimal pH for ZnPP formation shifted to higher values, with the amount of formed ZnPP markedly increased at the shifted optimal pH. Additionally, two bacterial strains isolated from incubated pork homogenate exhibited an enhanced ability to form ZnPP. Although the two isolated bacteria are not edible, inoculation with one bacterium into minced meat resulted in formation of large amounts of ZnPP and color closer to that of nitrite-added meat. These results suggest that appropriate food-grade bacterial strains can improve the color of various fermented meat products in the absence of nitrites/nitrates.
  • Investigation of contributors to zinc protoporphyrin IX formation at optimum pH 5.5 in pork
    Mofassara Akter; Akiko Shiraishi; Haruto Kumura; Toru Hayakawa; Jun‐ichi Wakamatsu
    Animal Science Journal, 90, 6, 774, 780, Wiley, 2019年06月, [査読有り], [国際誌]
    英語, 研究論文(学術雑誌), We investigated zinc protoporphyrin (ZnPP) formation in pork at pH 5.5, identified the contributors to ZnPP formation, and verified the involvement of myoglobin in this process. When pork homogenate was separated into two water-soluble fractions (>10 and <10 kDa) and an insoluble fraction, ZnPP formation was suppressed. ZnPP formation was rescued after mixing of all three fractions. Heating of the soluble <10 kDa fraction did not suppress the formation of ZnPP as opposed to heating of the soluble >10 kDa fraction, suggesting that protein(s) presents in the >10 kDa fraction contributed to ZnPP formation. Components of the soluble 10-30 kDa fractions separated by ultrafiltration were important in ZnPP formation. Exogenous myoglobin was not essential for ZnPP formation. A gel filtration study showed that soluble protein(s) with molecular weight higher than that of myoglobin was involved. Therefore, it was suggested that the soluble <10 kDa fraction, the insoluble fraction, and the soluble 10-30 kDa fraction (excluding myoglobin) are essential for ZnPP formation in pork at pH 5.5.
  • ‘Lipase and protease production of dairy Penicillium sp. on milk‐protein‐based solid substrates’
    Haruto Kumura; Megumi Satoh; Taiki Machiya; Makoto Hosono; Toru Hayakawa; Jun‐ichi Wakamatsu
    International Journal of Dairy Technology, 72, 3, 403, 408, 2019年04月26日, [査読有り], [筆頭著者]
    英語, 研究論文(学術雑誌)
  • Optimal pH of zinc protoporphyrin IX formation in porcine muscles: Effects of muscle fiber type and myoglobin content
    Jun-ichi Wakamatsu; Mofassara Akter; Fumika Honma; Toru Hayakawa; Haruto Kumura; Takanori Nishimura
    LWT, 101, 599, 606, Elsevier BV, 2019年03月, [査読有り]
    研究論文(学術雑誌)
  • Application of red pigment producing edible fungi for development of a novel type of functional cheese.
    Kumura, H; Ohtsuyama, T; Matsusaki Y; Taitoh, M; Koyanagi, H; Kobayashi, K; Hayakawa, T; Wakamatsu, J; Ishizuka S
    Journal of Food Processing and Preservation, 2018年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Adjunctive application of solid-state culture products from Aspergillus oryzae for semi-hard cheese.
    Kumura, H; Saito, C; Taniguchi, Y; Machiya; T; Takahashi, Y; Kobayashi, K; Kimura, A
    Journal of Advances in Dairy Research, 05, 03, OMICS Publishing Group, 2017年, [査読有り], [筆頭著者, 責任著者]
    英語, 研究論文(学術雑誌)
  • Prolactin and glucocorticoid signaling induces lactation-specific tight junctions concurrent with β-casein expression in mammary epithelial cells.
    Kobayashi K; Tsugami Y; Matsunaga K; Oyama S; Kuki C; Kumura H
    Biochimica et Biophysica Acta, 1863, 8, 2006, 2016, 2016年08月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Pro-inflammatory cytokine TNF-α is a key inhibitory factor for lactose synthesis pathway in lactating mammary epithelial cells.
    Kobayashi K; Kuki C; Oyama S; Kumura H
    Experimental Cell Research, 340, 2, 295, 304, 2016年01月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Early down-regulation of milk production after weaning by pup removal and prior to involution in mouse mammary glands
    Takaaki Uejyo; Chinatsu Kuki; Shoko Oyama; Haruto Kumura; Ken Kobayashi
    CELL AND TISSUE RESEARCH, 359, 2, 643, 653, 2015年02月
    英語, 研究論文(学術雑誌)
  • Stimulatory Effect of Brazilian Propolis on Hair Growth through Proliferation of Keratinocytes in Mice
    Shota Miyata; Yozo Oda; Chika Matsuo; Haruto Kumura; Ken Kobayashi
    JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 62, 49, 11854, 11861, 2014年12月
    英語, 研究論文(学術雑誌)
  • Underlying mechanisms involved in the decrease of milk secretion during Escherichia coli endotoxin induced mastitis in lactating mice
    Ken Kobayashi; Shoko Oyama; Takaaki Uejyo; Chinatsu Kuki; Md Morshedur Rahman; Haruto Kumura
    VETERINARY RESEARCH, 44, 119, 2013年12月
    英語, 研究論文(学術雑誌)
  • Histological analysis of mammary gland remodeling caused by lipopolysaccharide in lactating mice
    Ken Kobayashi; Takaaki Uejyo; Shoko Oyama; Md. Morshedur Rahman; Haruto Kumura
    Cell and Tissue Research, 354, 2, 495, 506, 2013年11月
    英語, 研究論文(学術雑誌)
  • Lipopolysaccharide Disrupts the Milk-Blood Barrier by Modulating Claudins in Mammary Alveolar Tight Junctions
    Ken Kobayashi; Shoko Oyama; Atsushi Numata; Md. Morshedur Rahman; Haruto Kumura
    PLoS ONE, 8, 4, 1, 12, 2013年04月23日
    英語, 研究論文(学術雑誌)
  • Potential of polar lipids from bovine milk to regulate the rodent dorsal hair cycle
    H. Kumura; T. Sawada; Y. Oda; M. Konno; K. Kobayashi
    JOURNAL OF DAIRY SCIENCE, 95, 7, 3629, 3633, 2012年07月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Distinct behavior of claudin-3 and -4 around lactation period in mammary alveolus in mice
    Ken Kobayashi; Haruto Kumura
    HISTOCHEMISTRY AND CELL BIOLOGY, 136, 5, 587, 594, 2011年11月
    英語, 研究論文(学術雑誌)
  • Production and partial purification of proteases from Aspergillus oryzae grown in a medium based on whey protein as an exclusive nitrogen source
    H. Kumura; T. Ishido; K. Shimazaki
    JOURNAL OF DAIRY SCIENCE, 94, 2, 657, 667, 2011年02月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Continuous supply of OSCN- ions by lactoperoxidase system developed from lactose as the primary substrate and its antibacterial activities
    Takuya Ishido; Toki Nishiyama; Woan-Sub Kim; Haruto Kumura; Kei-ichi Shimazaiki; Hidemasa Motoshima; Kazuhiro Kawai
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 66, 1, 76, 80, 2011年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Screening of Bifidobacterium spp. based on in vitro growth responses to bovine lactoferrin
    Md. Morshedur Rahman; Woan-Sub Kim; Haruto Kumura; Kei-ichi Shimazaki
    INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY, 45, 3, 453, 458, 2010年03月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Growth performance of whey protein hydrolysates in the media on different strains of probiotic bacteria
    Seema Kafley; Woan-Sub Kim; Haruto Kumura; Kei-Ichi Shimazaki
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 65, 3, 245, 248, 2010年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Growth promotion and cell binding ability of bovine lactoferrin to Bifidobacterium longum
    Md. Morshedur Rahman; Woan-Sub Kim; Toshiaki Ito; Haruto Kumura; Kei-ichi Shimazaki
    ANAEROBE, 15, 4, 133, 137, 2009年08月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Bovine lactoferrin region responsible for binding to bifidobacterial cell surface proteins
    Morshedur Rahman; Woan-Sub Kim; Haruto Kumura; Kei-ichi Shimazaki
    BIOTECHNOLOGY LETTERS, 31, 6, 863, 868, 2009年06月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Potential of yeast from dairy origin to modulate immunoglobulin production
    Haruto Kumura; Shinya Takii; Ubune Iwase; Kei-ichi Shimazaki
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 64, 1, 10, 13, 2009年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Growth and viability effects of cell-free extracts from dairy origin yeast on bifidobacteria
    Haruto Kumura; Yukie Ikezu; Erika Tajima; Kei-ichi Shimazaki
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 64, 3, 256, 259, 2009年, [査読有り]
    英語, 研究論文(学術雑誌)
  • UTILIZATION OF JAPANESE AROMATIC SUBSTANCES FOR MILK PRESERVATION AS ESTIMATED BY VAPOR CONTACT METHOD
    T. Khusniati; W. -S. Kim; S. Yanagisawa; H. Kumura; K. Shimazaki
    JOURNAL OF FOOD SAFETY, 28, 4, 601, 608, 2008年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Examination of bovine lactoferrin binding to bifidobacteria
    Md. M. Rahman; W. -S. Kim; T. Ito; H. Kumura; K. Shimazaki
    APPLIED BIOCHEMISTRY AND MICROBIOLOGY, 44, 5, 478, 481, 2008年09月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Autoaggregation and surface hydrophobicity of bifidobacteria
    Md. Morshedur Rahman; Woan-Sub Kim; Haruto Kumura; Kei-ichi Shimazaki
    WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY, 24, 8, 1593, 1598, 2008年08月, [査読有り]
    英語, 研究論文(学術雑誌)
  • In vitro effects of bovine lactoferrin on autoaggregation ability and surface hydrophobicity of bifidobacteria
    Md. Morshedur Rahman; Woan-Sub Kim; Haruto Kumura; Kel-Lchi Shimazaki
    ANAEROBE, 14, 2, 73, 77, 2008年04月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Purification of bovine lactoferrin isoforms and their effects on growth of Lactobacillus acidophilus CH-2
    Md. Morshedur Rahman; Woan-Sub Kim; Haruto Kumura; Kei-ichi Shimazaki
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 62, 1, 6, 8, 2007年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Profiles of bovine lactoferrin in the gastrointestinal tracts of rats as observed by ELISA, Western blotting and SELDI-affinity MS
    Ran E. Yoshise; M. Matsumoto; H. Chiji; H. Kuwata; K. Shin; K. Yamauchi; Y. Tamura; T. Tanaka; H. Kumura; K. Shimazaki
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 62, 4, 446, 450, 2007年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Visualization of bovine lactoferrin binding to Bifidobacteria
    Morshedur R Md; Kim WS; Ito T; Kumura H; Shimazaki, K
    Bioscience Microflora, 26, 3, 75, 79, JAPAN BIFIDUS FOUNDATION, 2007年, [査読有り]
    英語, 研究論文(学術雑誌), In the present study, binding of bovine lactoferrin to bifidobacteria was demonstrated. This is the first report showing the binding of bovine lactoferrin to Bifidobactesrium spp. under a transmission electronic microscope using biotinylated bovine lactoferrin and gold-conjugated streptavidin. In addition, we confirmed that bovine lactoferrin-binding protein exists on the surface of bifidobacteria.
  • Inhibitory activity of bovine milk osteopontin and its fragments on the formation of calcium phosphate precipitates
    Haruto Kumura; Natsuko Minato; Kei-Ichi Shimazaki
    JOURNAL OF DAIRY RESEARCH, 73, 4, 449, 453, 2006年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Parasiticidal activity of bovine lactoperoxidase against Toxoplasma gondii
    Tetsuya Tanaka; Shin Murakami; Haruto Kumura; Ikuo Igarashi; Kei-ichi Shimazaki
    BIOCHEMISTRY AND CELL BIOLOGY-BIOCHIMIE ET BIOLOGIE CELLULAIRE, 84, 5, 774, 779, 2006年10月
    英語, 研究論文(学術雑誌)
  • Constitutive expression of human lactoferrin and its N-lobe in rice plants to confer disease resistance
    K Takase; K Hagiwara; H Onodera; Y Nishizawa; M Ugaki; T Omura; S Numata; K Akutsu; H Kumura; K Shimazaki
    BIOCHEMISTRY AND CELL BIOLOGY-BIOCHIMIE ET BIOLOGIE CELLULAIRE, 83, 2, 239, 249, 2005年04月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Comparison of growth promoting effects on Bifidobacterium spp. by bovine lactoferrin hydrosates.
    Kim WS; Morshedur R Md; Kumura H; Shimazaki, K
    Bioscience Microflora, 24, 4, 119, 123, JAPAN BIFIDUS FOUNDATION, 2005年, [査読有り]
    英語, 研究論文(学術雑誌), The effect of bovine lactoferrin hydrolysates on the growth of four species of bifidobacteria, B. bifidum, B. longum, B. breve and B. infantis was investigated. It was observed that the growth of 3 species of bifidobacteria (B. bifidum, B. breve and B. infantis) was stimulated by bovine lactoferrin hydrolysates. These results suggest the possibility that lactoferrin, digested in the intestine, acts as a bifidogenic factor for the growth of bifidobacteria.
  • Screening of dairy yeast strains for probiotic applications
    H Kumura; Y Tanoue; M Tsukahara; T Tanaka; K Shimazaki
    JOURNAL OF DAIRY SCIENCE, 87, 12, 4050, 4056, 2004年12月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Susceptibility of bovine osteopontin to chymosin
    H Kumura; A Miura; E Sato; T Tanaka; K Shimazaki
    JOURNAL OF DAIRY RESEARCH, 71, 4, 500, 504, 2004年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Susceptibilities against bovine lactoferrin with microorganisms isolated from mastitic milk
    NY Lee; K Kawai; Nakamura, I; T Tanaka; H Kumura; K Shimazaki
    JOURNAL OF VETERINARY MEDICAL SCIENCE, 66, 10, 1267, 1269, 2004年10月
    英語, 研究論文(学術雑誌)
  • Detection of bovine lactoferrin binding protein on Jurkat human lymphoblastic T cell line
    T Tanaka; H Morita; YC Yoo; WS Kim; H Kumura; KI Shimazaki
    JOURNAL OF VETERINARY MEDICAL SCIENCE, 66, 7, 865, 869, 2004年07月
    英語, 研究論文(学術雑誌)
  • Growth-promoting effects of lactoferrin on L-acidophilus and Bifidobacterium spp.
    WS Kim; M Ohashi; T Tanaka; H Kumura; GY Kim; IK Kwon; JS Goh; K Shimazaki
    BIOMETALS, 17, 3, 279, 283, 2004年06月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Partial characterization of dextran-degrading enzyme obtained from blue cheese
    Y Wang; A Suzuki; T Tanaka; H Kumura; K Shimazaki
    JOURNAL OF DAIRY SCIENCE, 87, 6, 1627, 1633, 2004年06月, [査読有り]
    英語, 研究論文(学術雑誌)
  • The detection of bovine lactoferrin binding protein on Trypanosoma brucei
    T Tanaka; Y Abe; N Inoue; WS Kim; H Kumura; H Nagasawa; Igarashi, I; K Shimazaki
    JOURNAL OF VETERINARY MEDICAL SCIENCE, 66, 6, 619, 625, 2004年06月
    英語, 研究論文(学術雑誌)
  • The detection of bovine lactoferrin binding protein on Toxoplasma gondii
    T Tanaka; Y Abe; WS Kim; Xuan, X; H Nagasawa; Igarashi, I; H Kumura; K Shimazaki
    JOURNAL OF VETERINARY MEDICAL SCIENCE, 65, 12, 1377, 1380, 2003年12月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Antiviral activity of lactoferrin against canine herpesvirus
    T Tanaka; S Nakatani; XN Xuan; H Kumura; Igarashi, I; K Shimazaki
    ANTIVIRAL RESEARCH, 60, 3, 193, 199, 2003年11月
    英語, 研究論文(学術雑誌)
  • Expression of bovine lactoferrin and lactoferrin N-lobe by recombinant baculovirus and its antimicrobial activity against Prototheca zopfii
    T Tanaka; Nakamura, I; NY Lee; H Kumura; K Shimazaki
    BIOCHEMISTRY AND CELL BIOLOGY-BIOCHIMIE ET BIOLOGIE CELLULAIRE, 81, 5, 349, 354, 2003年10月
    英語, 研究論文(学術雑誌)
  • Expression and characterization of bovine lactoperoxidase by recombinant baculovirus
    T Tanaka; S Sato; H Kumura; K Shimazaki
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 67, 10, 2254, 2261, 2003年10月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Preliminary study and characterization of dextran degradation by the water-soluble fraction extracted from blue cheese
    K Shimazaki; S Maki; Y Wang; M Sato; T Tanaka; H Kumura
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 58, 7-8, 379, 382, 2003年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Liberation of free fatty acids from milk fat by lactic acid bacteria
    A Kimura; H Kumura; S Ishizuka; K Mikawa; K Shimazaki; Z Saito
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 58, 11-12, 609, 611, 2003年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Fine structures of epitopic sites in human and bovine lactoferrin recognized by anti-bovine lactoferrin C-lobe monoclonal antibody
    MS Nam; M Kamio; KI Shimazaki; S Harakawa; T Tanaka; Y Omata; A Saito; H Kumura; Igarashi, I; N Suzuki
    FOOD AND AGRICULTURAL IMMUNOLOGY, 14, 2, 139, 146, 2002年06月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Casein digestion by Debaryomyces hansenii isolated from cheese
    H Kumura; K Takagaki; T Sone; M Tsukahara; T Tanaka; K Shimazaki
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 66, 6, 1370, 1373, 2002年06月
    英語, 研究論文(学術雑誌)
  • Lactoferrin-binding proteins in Bifidobacterium bifidum
    WS Kim; T Tanaka; H Kumura; K Shimazaki
    BIOCHEMISTRY AND CELL BIOLOGY-BIOCHIMIE ET BIOLOGIE CELLULAIRE, 80, 1, 91, 94, 2002年02月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Primary culture of porcine mammary epithelial cells as a model system for evaluation of milk protein expression
    H Kumura; A Tanaka; Y Abo; S Yui; K Shimazaki; E Kobayashi; K Sayama
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 65, 9, 2098, 2101, 2001年09月
    英語, 研究論文(学術雑誌)
  • Production of recombinant bovine lactoferrin N-lobe in insect cells and its antimicrobial activity
    Nakamura, I; A Watanabe; H Tsunemitsu; NY Lee; H Kumura; K Shimazaki; Y Yagi
    PROTEIN EXPRESSION AND PURIFICATION, 21, 3, 424, 431, 2001年04月
    英語, 研究論文(学術雑誌)
  • Sequence analysis of porcine polymeric immunoglobulin receptor from mammary epithelial cells present in colostrum
    H Kumura; T Sone; K Shimazaki; E Kobayashi
    JOURNAL OF DAIRY RESEARCH, 67, 4, 631, 636, 2000年11月
    英語, 研究論文(学術雑誌)
  • Bovine lactoperoxidase and its recombinant: Comparison of structure and some biochemical properties
    S Watanabe; S Murata; H Kumura; S Nakamura; A Bollen; N Moguilevsky; K Shimazaki
    BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 274, 3, 756, 761, 2000年08月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Antibacterial activities and structure of Korean native goat lactoferrin and its synthetic peptides
    MS Nam; DY Yu; M Kimura; H Kumura; K Shimazaki
    ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES, 13, 282, 282, 2000年07月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Antimicrobial peptide of Korean native goat lactoferrin and identification of the part essential for this activity
    M Kimura; MS Nam; Y Ohkouchi; H Kumura; K Shimazaki; DY Yu
    BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 268, 2, 333, 336, 2000年02月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Approach to identification and comparison of the heparin-interacting sites of lactoferrin using synthetic peptides
    K Shimazaki; K Uji; T Tazume; H Kumura; T Shimo-Oka
    LACTOFERRIN: STRUCTURE, FUNCTION AND APPLICATIONS, 1195, 37, 46, 2000年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Autolysis of the proteinase from Pseudomonas fluorescens
    H Kumura; S Murata; T Hoshino; K Mikawa; K Shimazaki
    JOURNAL OF DAIRY SCIENCE, 82, 10, 2078, 2083, 1999年10月, [査読有り]
    英語, 研究論文(学術雑誌)
  • The ABC-exporter genes involved in the lipase secretion are clustered with the genes for lipase, alkaline protease, and serine protease homologues in Pseudomonas fluorescens no. 33
    E Kawai; A Idei; H Kumura; K Shimazaki; H Akatsuka; K Omori
    BIOCHIMICA ET BIOPHYSICA ACTA-GENE STRUCTURE AND EXPRESSION, 1446, 3, 377, 382, 1999年09月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Characterization of Korean native goat lactoferrin
    MS Nam; K Shimazaki; H Kumura; KK Lee; DY Yu
    COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY, 123, 2, 201, 208, 1999年06月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Comparison of secondary structure and antibacterial activity of bactericidal peptides derived from bovine and Korean native goat lactoferrin
    KI Shimazaki; MS Nam; T Tazume; H Kumura; K Mikawa; KK Lee; DY Yu
    PEPTIDE SCIENCE - PRESENT AND FUTURE, 759, 760, 1999年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • Properties of a heparin-binding peptide derived from bovine lactoferrin
    K Shimazaki; T Tazume; K Uji; M Tanaka; H Kumura; K Mikawa; T Shimo-Oka
    JOURNAL OF DAIRY SCIENCE, 81, 11, 2841, 2849, 1998年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Genetic characterization of pepP, which encodes an aminopeptidase P whose deficiency does not affect Lactococcus lactis growth in milk, unlike deficiency of the X-prolyl dipeptidyl aminopeptidase
    J Matos; M Nardi; H Kumura; Monnet, V
    APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 64, 11, 4591, 4595, 1998年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Molecular cloning and analysis of a lipase gene from Pseudomonas fluorescens No. 33
    H Kumura; S Hirose; H Sakurai; K Mikawa; F Tomita; K Shimazaki
    BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 62, 11, 2233, 2235, 1998年11月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Expression of human lactoferrin in transfected rat mammary epithelial cells
    H Kumura; Y Hiramatsu; Y Ukai; K Mikawa; K Shimazaki
    ADVANCES IN LACTOFERRIN RESEARCH, 443, 85, 89, 1998年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Structural and immunochemical studies on bovine lactoferrin fragments.
    Shimazaki K; Kamio M; Nam MS; Harakawa S; Tanaka T; Omata Y; Saito A; Kumura H; Mikawa K; Igarashi I; Suzuki N
    Advances in experimental medicine and biology, 443, 41, 48, Springer US, 1998年, [査読有り]
    論文集(書籍)内論文
  • Monoclonal antibody against bovine Lactoferricin(R) and its epitopic site
    K Shimazaki; MS Nam; S Harakawa; T Tanaka; Y Omata; A Saito; H Kumura; K Mikawa; Igarashi, I; N Suzuki
    JOURNAL OF VETERINARY MEDICAL SCIENCE, 58, 12, 1227, 1229, 1996年12月, [査読有り]
    英語, 研究論文(学術雑誌)
  • INFLUENCE OF MILK-PROTEINS ON THE THERMOSTABILITY OF THE LIPASE FROM PSEUDOMONAS-FLUORESCENS-33
    H KUMURA; K MIKAWA; Z SAITO
    JOURNAL OF DAIRY SCIENCE, 76, 8, 2164, 2167, 1993年08月, [査読有り]
    英語, 研究論文(学術雑誌)
  • PURIFICATION AND SOME PROPERTIES OF PROTEINASE FROM PSEUDOMONAS-FLUORESCENS NO-33
    H KUMURA; K MIKAWA; Z SAITO
    JOURNAL OF DAIRY RESEARCH, 60, 2, 229, 237, 1993年05月, [査読有り]
    英語, 研究論文(学術雑誌)
  • PURIFICATION AND CHARACTERIZATION OF LIPASE FROM PSEUDOMONAS-FLUORESCENS NO 33
    H KUMURA; K MIKAWA; Z SAITO
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 48, 8, 431, 434, 1993年, [査読有り]
    英語, 研究論文(学術雑誌)
  • Influence of concomitant protease on the thermostability of lipase of psychrotropic bacteria.
    Kumura H; Mikawa K; Saito Z
    Milchwissenschaft, 46, 144, 149, 1991年, [査読有り]
    英語, 研究論文(学術雑誌)
  • EFFECT OF PROTEASE ON CONCOMITANT LIPASE PRODUCED BY PSEUDOMONAS SP NO 33
    H KUMURA; K MIKAWA; Z SAITO
    MILCHWISSENSCHAFT-MILK SCIENCE INTERNATIONAL, 46, 4, 215, 218, 1991年, [査読有り]
    英語, 研究論文(学術雑誌)
■ その他活動・業績
■ 書籍等出版物
  • 乳肉卵の機能と利用(新版)
    玖村 朗人
    アイ・ケイコーポレーション, 2018年09月
  • 畜産物利用学
    文永堂, 2011年
  • 最新畜産物利用学
    朝倉書店, 2006年
  • 乳肉卵の機能と利用
    玖村 朗人
    アイ・ケイコーポレーション, 2005年
■ 主な担当授業
  • 大学院共通授業科目(一般科目):自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
  • 食品科学特論, 2024年, 修士課程, 農学院
  • 食品科学特論演習, 2024年, 修士課程, 農学院
  • 畜産食品衛生学, 2024年, 学士課程, 農学部
  • 基礎畜産物利用学Ⅰ, 2024年, 学士課程, 農学部
  • 畜産科学概論, 2024年, 学士課程, 農学部
  • 応用食品科学, 2024年, 学士課程, 農学部
  • 応用食品科学実験, 2024年, 学士課程, 農学部
■ 所属学協会
  • 北海道畜産草地学会
  • 日本畜産学会
  • 日本栄養・食糧学会
  • 日本農芸化学会
■ 共同研究・競争的資金等の研究課題
  • 真菌類を利用した新規生活習慣病予防食品素材の開発
    科学研究費助成事業
    2013年04月01日 - 2017年03月31日
    玖村 朗人; 石塚 敏
    紅麹菌は動脈硬化のリスク低減を目的とした機能性食品素材の開発に有効な二次代謝産物を産生する食用微生物である。しかし一方で肝腎障害に関わるシトリニンを同時に産生する場合があり、食品素材への紅麹菌の応用に際しては適切な菌株選択と厳密な培養制御が必要である。そこで申請者は広汎な条件設定にも対応可能な上に調製が容易で、得られる培養産物をready to eatで利用可能な固体培養基剤を用いて菌株や培養条件を精査し、得られる紅麹菌培養物を実験動物に給餌して機能性を評価する研究プログラムを立案した。
    日本学術振興会, 基盤研究(C), 北海道大学, 25350120
  • 食用微生物代謝産物の機能性
    2009年
    競争的資金
  • 発酵性乳製品由来の酵母を用いた新規プロバイオティクス製品開発を目指した基礎的研究
    科学研究費助成事業
    2004年 - 2006年
    玖村 朗人
    近年、発酵食品が健康に及ぼす効果について高い関心が寄せられ、乳酸菌やビフィズス菌を始めとする数々の微生物の機能に関する研究が行われている。本研究では新たなプロバイオティック微生物を探索するために発酵乳製品由来の酵母に着目し、その免疫調節作用と代表的な腸内細菌であるビフィズス菌の増殖や生存性に及ぼす効果を観察した。
    まず酵母の投与が消化管や乳腺の免疫グロブリンA産生に及ぼす影響とオブアルブミン(OMへ)で免疫したマウスから調製した培養脾臓細胞の免疫グロブリンE(IgE)やサイトカイン産生に及ぼす影響について観察した。その結果、統計的な有意差はなかったものの、酵母添加飼料を投与した場合、大腸内容物中のIgA濃度が高値となる傾向が認められた。さらに本実験で供試した全ての酵母菌体(6菌種、46株)において培養脾臓細胞のIgE産生抑制効果が観察された。また、酵母菌体によって同細胞のIFN-γの産生は誘導されなかったが、IL-12産生については菌株によって異なる結果が得られた。マウスを用いたin vivo実験においては、酵母または乳酸菌の単独あるいは混合経口投与によってOVAで感作したマウスの血中IgE濃度を測定したが、この実験系においてはいずれの微生物においてもIgE産生抑制効果を観察することは出来なかった。
    さらに脱脂乳でビフィズス菌を培養する際に酵母菌体抽出物を添加することによって、ビフィズス菌の増殖性やその後、冷蔵保存時の生存性を高めることが確認された。酵母菌体破砕物中のビフィズス菌増殖促進因子は沸騰条件で30分間処理した後にもその効果を一部維持した。
    真核細胞である酵母は培養環境によって多様な遺伝子発現の誘導または抑制をみせる。それゆえ、酵母の培養条件によって未知の機能性を現わす可能性がある。本実験で用いた食品由来の安全な酵母を有効活用するためのさらなる研究が期待される。
    日本学術振興会, 基盤研究(C), 北海道大学, 16500502
  • 触媒アミノ酸の変異により新しい機能を獲得したグリコシラーゼの研究
    科学研究費助成事業
    2002年 - 2004年
    木村 淳夫; 森 春英; 奥山 正幸; 玖村 朗人
    グリコシラーゼは糖質のグリコシド結合を加水分解する酵素の総称である。これらの酵素は加水分解の他に、基質のグリコシド残基をアクセプターに転移する反応(糖転移反応)を示す。転移反応は応用性が高く、i)清涼飲料水などの食品に含まれる機能性オリゴ糖の生産やii)多彩な生理活性をもつ複合糖鎖の合成に利用されている。しかし、加水分解と糖転移反応は切り離すことはできず、同時に進行する。従って、転移糖の生成条件であっても基質の加水分解が行われ、かつ、転移反応の生成物も分解されてしまう。我々は、グリコシラーゼの構造と機能を解析してきた。この研究過程で糖転移反応のみを抽出できる現象を見出した。本課題の目的は、本現象の機構を分子解析し応用に結びつけることであり、成果を以下に示す。1)対象としたグリコシラーゼについて自殺基質の手法で求核残基を推定後、本残基の点置換酵素(合成酵素)を発現・精製した。フルオライド基質について合成法を確立させ、大量調製を行った。得られた合成酵素は、いずれも分解活性を示さず、フルオライド基質とアクセプター基質を合成させる反応のみを行った。合成の至適pHはアルカリ側へシフトし、本現象は一般的に観察された。アクセプター特異性を調べたところ、アリールなどの疎水基を有する合成配糖体が最も高い収率を与えた。これは、サブサイト+2による疎水グループへの認識能が高いことを意味している。2)「歪み発生のアミノ酸変異酵素」を作製・精製・性質解析を行い、オリゴ糖合成試験を行った。収率が低いことが判明したので、反応条件を検討し、基質濃度の変化に効果を認めた。また、有機溶媒の添加も有効であったが、高濃度では活性低下が生じた。有機溶媒に耐性な糖質分解酵素が得られているので、これを歪み発生型酵素にするような発展研究を行いたい。
    日本学術振興会, 基盤研究(B), 北海道大学, 14360043
  • ウシラクトペルオキシダーゼとその組み換え体を用いた構造と機能の解析
    科学研究費助成事業
    1999年 - 2000年
    島崎 敬一; 田仲 哲也; 玖村 朗人; 中村 信吾
    牛乳に含まれる酸化還元酵素・ラクトペルオキシダーゼの示す抗菌・抗ウイルス活性を自由に操作出来るならば、医薬品や食品へ応用する際に非常な利点となると考えられる。そこで組換えラクトペルオキシダーゼを調製し、牛乳由来のラクトペルオキシダーゼと比較することで、活性に寄与する高次構造、およびヘム近傍の微細構造についての詳細な情報を得ることを目的としてこれまでに以下の実験を行った。
    〇ラクトペルオキシダーゼの検出に用いる目的で、ラクトペルオキシダーゼに対するポリクローナルおよびモノクローナル抗体を作成した。モノクローナル抗体については、ラクトペルオキシダーゼ分子内のエピトープ部位も決定した。
    〇ウシ乳腺細胞からラクトペルオキシダーゼ遺伝子をクローニングし、CHO細胞を用いて組換え体を発現させ、さらにイオン交換クロマトグラフィーにて精製した。発現した組換え体の確認は、抗ラクトペルオキシダーゼ抗体および活性測定にて行った。
    〇円偏光二色性スペクトルの測定により、牛乳ラクトペルオキシダーゼと高次構造が同じであることを確かめた。一方、牛乳ラクトペルオキシダーゼのN-末端アミノ酸部分は組換え体に比べて15〜20残基短かいことを見いだし、ミルク中に分泌される際の機構に新たな知見を加えた。
    〇牛乳から分離したラクトペルオキシダーゼおよび組換えラクトペルオキシダーゼをペプシン分解した後、ヘム結合フラグメントを逆相クロマトグラフィーにより分離することに成功した。現在、そのフラグメントのアミノ酸配列を決定中であり、ヘムとの結合様式を推定する手掛かりとなるものと期待される。
    日本学術振興会, 基盤研究(B), 北海道大学, 11694189
  • ブタ乳腺上皮細胞の培養と樹立株の構築
    科学研究費助成事業
    1997年 - 1998年
    玖村 朗人
    本研究は平成8年度文部省科学研究費補助金を得て開始されたもので、前年度までに細胞の分離・培養条件をほぼ確立し、細胞の分化機能を観察するためのポリクローナル抗体も調製した。昨年度の時点では分離した乳腺細胞の培養はプラスチックシャーレ上で行なっており、RT-PCRによってカゼインの発現が窺われたもののウエスタンブロットではその発現が検出できなかった。
    今年度はまず乳腺細胞の分化により好適といわれているコラーゲン・ゲルを用いる浮遊培養法に改変し、カゼインの発現を詳細に明らかにしようとした。無血清培地にインシュリン、コルチゾール、プロラクチン等の因子を様々に組み合わせて観察した結果、インシュリンの単独添加でもカゼインの発現が認められることがRT-PCRとウエスタンブロットによって明らかになった。他の動物種由来の乳腺細胞のカゼイン発現に必須であると考えられているプロラクチンを添加してもカゼインの発現は増強されなかった。このことから培養したブタ乳腺上皮細胞はin vitroにおいてなお、カゼインの合成能を有していること、そしてそれはこれまで明かにされてきたプロラクチンとは異なる系が関与していることが示唆された。さらに、本研究は遺伝子導入による分化機能を維持した乳腺細胞の株化を目的としていることから、pSVneoを6種類のリポフェクトアミンによって培養した乳腺細胞に導入し長期間G418存在下で細胞が生存しうるかどうかを検討した。その結果、どのリポフェクトアミンを用いた場合からも長期間安定にベクターが機能する細胞を得るまでには至らなかった。使用するブタの履歴を特定化することや遺伝子を導入する方法を再検討することなどが今後の課題である。
    日本学術振興会, 奨励研究(A), 北海道大学, 09760247
  • ブタ乳腺上皮細胞の分離・樹立
    科学研究費助成事業
    1996年 - 1996年
    玖村 朗人
    本研究課題であるブタ乳腺上皮細胞の分離・樹立を遂行するためには、1)乳腺組織からの上皮細胞の分離・培養条件の検討、2)in vitroにおける乳蛋白質合成能の確認、3)樹立株の構築のために適用する遺伝子導入法の検討ならびにその条件の最適化が不可欠である。ブタ乳腺上皮細胞の分離はこれまで報告例がなく、さらに遺伝子導入時の転換効率を考慮すれば、まずは他の細胞の混入が極力回避される上皮細胞の分離法の確立が望ましい。そこで、その条件を種々検討した結果、以下のようになった。
    ブタ乳腺組織を細切した後、コラゲナーゼ、デイスパーゼ、ヒアルロニダーゼ、インスリン、DNaseを添加した199倍地を用いて37℃で5時間振とう処理した。一旦細胞を遠心分離によって回収し、DNase、プロナーゼを添加した199倍地を用いて37℃1時間処理した。回収した細胞をDNase、BSA、199培養液を加えて浮遊させ、パーコールを用いた密度勾配遠心分離法によって乳腺細胞の層を採取した。さらに、細胞をナイロンメッシュでろ過し、大きな細胞塊を取り除くと共に、その細胞浮遊液を静置しても沈まず分散した細胞も除去した。このようにして得た乳腺細胞の画分をインスリン、EGF、プロゲステロン、グルココルチコイドを単独あるいは併用で実験を行った結果、マウスやラットとは異なり、ブタ乳腺細胞の増殖にはグルココルチコイドが必要であることが明らかとなった。
    細胞のin vitroにおける乳蛋白質の発現は未確認である。しかし、ブタミルクよりα-、β-カゼイン、β-ラクトグロプリンをカラムクロマトグラフィーによって精製し、マウスに免疫した結果、特に力価の高い抗体として抗β-カゼイン血清を得ることができたため、これを用いて分離した細胞の分化能に関する観察が可能であると考えられる。
    日本学術振興会, 奨励研究(A), 北海道大学, 08760253