著者

Yoshihiko AKAKABE Aya KUSUNOKI Yukinori IKEDA Mamoru TANAKA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.72, no.7, pp.1969-1972, 2008-07-23 (Released:2008-07-23)

参考文献数

8

被引用文献数

5

---

A total of 20 volatile organic compounds from the peel of citrus fruit Ohshima no. 1 were identified by gas chromatography-mass spectrometry (GC-MS). The amount of limonene in Ohshima no. 1 was lower than those in the parent cultivars, Miyauchi iyokan and Yoshiura ponkan, whereas those of γ-terpinene, linalool, sabinene, p-cymene, and terpinolene in Ohshima no. 1 were somewhat higher. However, comparing the results, it was found that volatile components from both parent cultivars were present in the peel of Ohshima no. 1. Principal component analysis (PCA) of data obtained with an electronic nose indicated that the odor of Ohshima no. 1 showed a clear upward displacement as compared with those of parent cultivars in PC1. The oils of Miyauchi iyokan and Yoshiura ponkan showed displacement in a negative direction, and a positive one in PC2. By PCA analysis, it was found that the odor quality of Ohshima no. 1 was very different from those of the parent cultivars.

著者

Kunimitsu KAYA Atsushi NAKAZAWA Hiroshi MATSUURA Daisuke HONDA Isao INOUYE Makoto M. WATANABE

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.75, no.11, pp.2246-2248, 2011-11-23 (Released:2011-11-23)

参考文献数

24

被引用文献数

113

---

Here we report on the 18W-13a strain of Aurantiochytrium sp., which accumulates very high amounts of squalene. The squalene contents and production at 4 d of culture were 198 mg/g and 1.29±0.13 g/L, respectively, exceptionally high values compared to previous reports.

著者

Fumitaka HAYASE Takeshi SHIBUYA Junichi SATO Masatomo YAMAMOTO

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.60, no.11, pp.1820-1825, 1996-11-23 (Released:2008-02-08)

参考文献数

28

被引用文献数

50

---

The generation of fluorescence and 3-deoxyglucosone (3DG), browning, polymerization, and impairment of the amino acid residues of lysozyme incubated with glucose were investigated at 37°C and 50°C at pH 7.4 in a phosphate or TAPSO buffer under aerobic and non-aerobic conditions with or without DETAPAC as a chelating reagent. Browning, the generation of fluorescence, and polymerization were accelerated under the non-aerobic, compared to aerobic, conditions. Moreover, the formation of 3DG was also significantly increased under non-aerobic conditions. The incubation of both reaction systems resulted in noticeable losses of arginine and lysine residues. DETAPAC significantly inhibited the advanced Maillard reaction under both aerobic and non-aerobic conditions. However, DETAPAC had no effect on the impairment of lysine and arginine residues. The generation of fluorescence, browning and polymerization of lysozyme in the TAPSO buffer were markedly inhibited under both aerobic and non-aerobic conditions. These observations suggest that transition metals in the phosphate buffer may have accelerated the formation of Amadori compounds via Schiff's base. In addition, under non-aerobic conditions, the formation of advanced glycation end products from 3DG via Amadori compounds is presumed to be the major pathway, because the formation of Nε-(carboxymethyl)lysine, glyoxal, and glucosone was accelerated by an oxidative reaction catalyzed with transition metal ions. These presumptions are supported by the results from a lysozyme-3DG reaction system.

著者

Yan YANG LiBin YE JingSong ZHANG YanFang LIU QingJiu TANG

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.73, no.1, pp.134-139, 2009-01-23 (Released:2009-01-23)

参考文献数

25

被引用文献数

34

---

PISP1, a heteropolysaccharide isolated from fruiting bodies of Phellinus igniarius by hot aqueous extraction and purified by DEAE-Sepharose anion-exchange and gel filtration chromatography, is composed of fucose, galactose, mannose, and 3-O-Me-galactose in a ratio of 1:2:1:2. Methylation, monosaccharide analysis, and NMR studies (1H NMR, 13C NMR, COSY-45°, TOCSY, ROESY, HSQC, and HMBC) revealed that PISP1 had a backbone consisting of 1,6-disubstituted-3-O-Me-α-D-galactopyranosyl residue, 1,3,6-trisubstituted-α-D-manopyranosyl residue, 1,4-disubstituted-α-D-galactopyranosyl residue, and 1,2-disubstituted-α-D-galactopyranosyl residue, and had a 1-substituted-α-L-fucopyranosyl terminal attached to O-3 of a manopyranosyl residue. Preliminary bioactivity tests conducted in vitro revealed that PISP1 stimulated the proliferation of mouse spleen lymphocytes.

著者

SAKAI Kiyofumi YAMAUCHI Tatsuo NAKASU Fumiko OHE Tatsuhiko

出版者

社団法人日本農芸化学会

雑誌

Bioscience, biotechnology, and biochemistry (ISSN:09168451)

巻号頁・発行日

vol.60, no.10, pp.1617-1622, 1996-10-23

被引用文献数

9 60

---

Bacteria capable of assimilating cellulose acetate, strains SB and SC, were isolated from soil on a medium containing cellulose acetate as a carbon source, and identified as Neisseria sicca. Both strains degraded cellulose acetate membrane filters (degree of substitution, DS, mixture of 2.8 and 2.0) and textiles (DS, 2.34) in a medium containing cellulose acetate (DS, 2.34) or its oligomer, but were not able to degrade these materials in a medium containing cellobiose octaacetate. Biodegradation of cellulose acetate (DS, 1.81 and 2.34) on the basis of biochemical oxygen demand reached 51 and 40% in the culture of N sicca SB and 60 and 45% in the culture of N. sicca SC within 20 days. A decrease in the acetyl content of degraded cellulose acetate films and powder was confirmed by infrared and nuclear magnetic resonance analyses. After 10-day cultivation of N. sicca SB and SC, the number-average molecular weight of residual cellulose acetate decreased by 9 and 5%, respectively. Activities of enzymes that released acetic acid and produced reducing sugars from cellulose acetate were mainly present in the culture supernatant. Reactivity of enzymes for cellulose acetate (DS, 1.81) was higher than that for cellulose acetate (DS, 2.34).

著者

Ken KATO Yukihiro TAKADA Hiroaki MATSUYAMA Yoshihiro KAWASAKI Seiichiro AOE Hideo YANO Yasuhiro TOBA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.66, no.11, pp.2342-2346, 2002 (Released:2003-06-19)

参考文献数

21

被引用文献数

13

---

We investigated the calcium bioavailability of milk calcium, taken with or without cheese. Twenty-four 6-week-old male rats for a meal-feeding experiment were trained to consume an AIN-76 diet within 2 h (2 times per day) for 2 weeks. The rats were then divided into three experimental groups, each fed 2 types of experimental diets: Control group, Cheese group, and Ca-Cheese group. The rats were each alternately given 2 types of experimental diets at 2-h meal-feeding for 31 days. The breaking force and energy of the femur in the Ca-Cheese group were significantly higher than in the control group. The bone mineral density (BMD) of the lumbar spine and the femur in the Ca-Cheese group was also significantly higher than in the other two groups. These results indicate that milk calcium taken with cheese increases bone strength and BMD efficiently, results that may be useful for the prevention of osteoporosis.

著者

Noriko HAYASHI Tetsuo IIDA Takako YAMADA Kazuhiro OKUMA Isao TAKEHARA Takashi YAMAMOTO Koji YAMADA Masaaki TOKUDA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.74, no.3, pp.510-519, 2010-03-23 (Released:2010-03-23)

参考文献数

36

被引用文献数

141

---

This clinical study was conducted to investigate the safety and effect of D-psicose on postprandial blood glucose levels in adult men and women, including borderline diabetes patients. A randomized double-blind placebo-controlled crossover experiment of single ingestion was conducted on 26 subjects who consumed zero or 5 g of D-psicose in tea with a standard meal. The blood glucose levels at fasting and 30, 60, 90, and 120 min after the meal were compared. The blood glucose level was significantly lower 30 and 60 min after the meal with D-psicose (p<0.01, p<0.05), and a significant decrease was also shown in the area under the curve (p<0.01). The results suggest that D-psicose had an effect to suppress the postprandial blood glucose elevation mainly in borderline diabetes cases. A randomized double-blind placebo-controlled parallel-group experiment of long-term ingestion was conducted on 17 normal subjects who took 5 g of D-psicose or D-glucose with meals three times a day for 12 continuous weeks. Neither any abnormal effects nor clinical problems caused by the continuous ingestion of D-psicose were found.

著者

Kenji KUMAZAWA Nao SAKAI Hiroko AMMA Satoshi SAKAMOTO Masaki KODAMA Yoshiyuki WADA Osamu NISHIMURA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.74, no.6, pp.1231-1236, 2010-06-23 (Released:2010-06-23)

参考文献数

17

被引用文献数

5

---

An aroma concentrate of the mat rush (igusa) was prepared by combining solvent extraction with the solvent-assisted flavor evaporation (SAFE) technique. An aroma extract dilution analysis (AEDA) applied to the volatile fraction revealed 51 odor-active peaks with FD factors between 43 and 47. Among the perceived odorants, twelve peaks with the higher FD factors (≥46) were proved to be the most important components of the characteristic aroma in mat rush. Eleven odorants were identified or tentatively identified from the twelve peaks as methional, (E,Z)-2,6-nonadienal, (E)-2-nonenal, (E,E)-2,4-nonadienal, (E,E,Z)-2,4,6-nonatrienal, trans-4,5-epoxy-(E)-2-decenal, 4-hydroxy-2,5-dimethyl-3(2H)-furanone, 3-hydroxy-4,5-dimethyl-2(5H)-furanone, isovaleric acid, methyl anthranirate, and vanillin. The FD factors of the odor-active peaks in dried mat rush were observed to be much higher than those in raw mat rush. This finding suggests that the drying process during manufacturing of the mat rush is one of the most important factors for the formation of the characteristic mat rush aroma.

著者

Katsuhiko BABASAKI Kazuhiko MASUNO Hitoshi MURATA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.67, no.1, pp.100-106, 2003 (Released:2003-06-25)

参考文献数

29

被引用文献数

12

---

The spawn of cultivated mushrooms are generally produced, propagated, and distributed to growers as a mycelial culture without genetic purification, in which phenotypic variants frequently occur. We investigated how heterologous mycelia present in a spawn influence fruit body production in the cultivated basidiomycete Pholiota nameko. The ‘di-mon’ dual cultivation of protoplast clones produced mosaic fruit bodies, which could result from the ‘di-mon’ mating. In the ‘di-di’ dual cultivation of heterologous strains with different fruiting times, authentic fruit bodies of each dikaryon and chimera showing a feature combining characteristics of the two dikaryons emerged simultaneously. Mycelia isolated from the chimera produced all three types of fruit bodies, indicating unlikeliness of the occurrence of anastomosis. These results suggest that mycelia colonized in the substrate interact with each other and coordinately promote fruit body production in P. nameko. This phenomenon masks a clonal variability that may be surfaced through multiplication and distribution of the spawn, occasionally bringing about abnormal fruiting.

著者

Hiroshi UEDA Atsuko TAKEUCHI Tadayuki WAKO

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.77, no.9, pp.1809-1813, 2013-09-23 (Released:2013-09-23)

参考文献数

23

被引用文献数

11

---

Bunching onion [Allium fistulosum L. (Liliaceae)] secretes mucus in the cavities of its green leaves. The effects of the mucus, which is consumed as food, were examined. The mucus augmented the production of tumor necrosis factor (TNF)-α and monocyte chemotactic protein (MCP)-1 from RAW 264 cells and of interleukin (IL)-12 from J774.1 cells; however, extracts from green leaves and white sheaths did not. An oral administration of this mucus to mice augmented the immune functions of peritoneal cells by increasing TNF-α and IL-12 production and phagocytosis. It also augmented interferon (IFN)-γ production from spleen cells and natural killer (NK) activity. These results suggest that an oral administration of the A. fistulosum mucus can enhance natural immunity.

著者

Honma Tsutomu Akino Toshiro

出版者

社団法人日本農芸化学会

雑誌

Bioscience, biotechnology, and biochemistry (ISSN:09168451)

巻号頁・発行日

vol.62, no.9, pp.1684-1687, 1998-09-23

参考文献数

13

被引用文献数

1 7

---

&nbsp;&nbsp;Five microbial strains that removed hydrogen sulfide (H₂S) or methylmercaptan (CH₃SH) gas were newly isolated from soil samples. Strain DO-1, one of the isolates, was identified as a member of <i>Pseudomonas</i> sp., and it&rsquo;s immobilized cells removed 1 or 10 ppm of H₂S gas within 2 hours. When strain DO-1 was cultured aerobically in a flask containing nutrient broth medium, the deodorizing activity increased, depending on the growth of the culture, and the maximum activity was obtained after 48 hours. Even though the immobilized cells were stored at 4 or 25&deg;C in sealed bottles for 6 months, the deodorizing activity remained. Throughout this study, strain DO-1 removed H₂ S gas without preliminary feeding or exposure to sulfur com-pounds as growth substrates or inducers. These characteristics are advantageous for the deodorization of the malodorous gases surrounding us in daily life.<br>

著者

Kumeno Keiko Kurimoto Kimie Nakahama Nobuko Watanabe Michiko

出版者

社団法人日本農芸化学会

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.58, no.3, pp.447-450, 1994-03-23

被引用文献数

3 6

---

Commercially available egg white was freeze-concentrated using bacterial ice nuclei, which improved its foaming properties. Baked meringue, angel cake, snow-jelly, and marshmallow were prepared using freeze-concentrated egg white foam and their physical properties were evaluated. We concluded that freeze-concentrated egg white can be used to make some foam foods.

著者

Takeshi Takahashi Toshi Oka Hirokazu Iwana Tamotsu Kuwata Yoshiro Yamamoto

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.57, no.9, pp.1557-1560, 1993-09-23 (Released:2008-02-08)

参考文献数

27

被引用文献数

47

---

In order to elucidate the interaction of lactic acid bacteria with the immune system, immune responses to the lactic acid bacteria, Bifidobacterium longum and Lactobacillus acidophilus, were examined in mice fed with each organism. In mice fed with B. longum for more than 8 weeks, an antibody response was detected to the cytoplasm of B. longum, but not to the cell wall. On the other hand, in mice fed with L. acidophilus for more than 6 weeks, an antibody response was detected to both the cytoplasm and cell wall of L. acidophilus. Moreover, feeding each organism for 2 weeks enhanced the proliferative response of Peyer's patch (PP) cells to the cell fraction against which the serum antibody was detected. However, this was not found with spleen cells. These results suggest that mucosal stimulation by lactic acid bacteria may induce a systemic immune response to them.

著者

Yoshinori KATAKURA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.70, no.5, pp.1076-1081, 2006-05-23 (Released:2006-05-23)

参考文献数

26

被引用文献数

13

---

Although dysfunctional telomeres and oncogenic or stressful stimuli are known to trigger cellular senescence in normal human diploid cells, the molecules and signaling network involved in the cellular senescence program are not fully understood. We have been trying to identify cellular senescence-inducing factors by various means. First, we screened for an extrinsic signal that can induce cellular senescence in human lung adenocarcinoma cell line A549, and identified transforming growth factor-β (TGF-β) as the cellular senescence-inducing factor. Cancer cells senesced by treatment with TGF-β impaired tumorigenicity both in vitro and in vivo, suggesting that cellular senescence functions as a tumor suppression mechanism. Next, we identified 86 independent senescence-associated genes by subtractive screening using A549-derived cell lines. Thirdly, we established novel cell lines (AST cells) from A549 cells exposed to mild oxidative stress. AST cells demonstrated functional impairment of telomerase due to perturbed subcellular localization of human telomerase reverse transcriptase, suggesting that mild oxidative stress might affect the cell fate of cancer cells. These results should provide insight into the molecular basis of the cellular senescence program.

著者

Hatakeyama Tomomitsu Himeshima Tomoharu Komatsu Akane Yamasaki Nobuyuki

出版者

社団法人日本農芸化学会

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.57, no.10, pp.1736-1739, 1993-10-23

被引用文献数

2 15

---

Two Ca^<2+>-dependent lectins were purified from the sea cucumber Stichopus japonicus by affinity chromatography on lactosyl-Sepharose 4B and ion-exchange chromatography on Q-Sepharose. Their molecular masses were estimated to be 13 kDa (SJL-I) and 15 kDa (SJL-II) on SDS-PAGE. SJL-I agglutinated rabbit erythrocytes as well as human A, B, and O-type erythrocytes, but SJL-II agglutinated only rabbit erythrocytes. Hemagglutination by SJL-I was competitively inhibited by N-acetyl-D-galactosamine and galactose-containing carbohydrates. On the other hand, only lactose, melibiose, and raffinose gave weak inhibition of hemagglutination by SJL-II, suggesting that SJL-II may have high specificity for particular complex carbohydrate(s) on the surface of rabbit erythrocytes. SJL-II was activated at ten times lower Ca^<2+> concentration than SJL-I. Both lectins lost activity in acidic pH, while SJL-I appeared more stable down to pH 4.5.

著者

Bei-Wei ZHU Lu-Lu ZHAO Li-Ming SUN Dong-Mei LI Yoshiyuki MURATA Lei YU Lei ZHANG

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.72, no.6, pp.1430-1437, 2008-06-23 (Released:2008-06-23)

参考文献数

36

被引用文献数

40

---

Cathepsin L-like enzyme was purified from the body wall of the sea cucumber Stichopus japonicus by an integral method involving ammonium sulfate precipitation and a series of column chromatographies on DEAE Sepharose CL-6B, Sephadex G-75, and TSK-GEL. The molecular mass of the purified enzyme was estimated to be 63 kDa by SDS–PAGE. The enzyme cleaved N-carbobenzoxy-phenylalanine-arginine7-amido-4-methylcoumarin with Km (69.92 μM) and kcat (12.80/S) hardly hydrolyzed N-carbobenzoxy-arginine-arginine 7-amido-4-methylcoumarin and L-arginine 7-amido-4-methylcoumarin. The optimum pH and temperature for the purified enzyme were found to be 5.0 and 50 °C. It showed thermal stability below 40 °C. The activity was inhibited by sulfhydryl reagents and activated by reducing agents. These results suggest that the purified enzyme was a cathepsin L-like enzyme and that it existed in the form of its enzyme-inhibitor complex or precursor.

著者

Kawaii Satoru Yoshizawa Yuko Mizutani Junya

出版者

社団法人日本農芸化学会

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.58, no.5, pp.982-985, 1994-05-23

被引用文献数

2 4

---

The physiological effects of two phenolic nematocides, chavicol and demethyleugenol, on C. elegans were studied by [Ca^<2+>]_i measurement using a microspectrofluorometer and an image analyzer. Chavicol and demethyleugenol, which had similar effects on the nematodes, caused a significant elevation of [Ca^<2+>]_i in the intestinal tract. The image analysis suggested that these phenolic nematocides caused the destruction of cell membrane and the leakage of cytosol from the intestinal tract into the pseudocoelomic cavity.

著者

Akio KURODA

出版者

Japan Society for Bioscience, Biotechnology, and Agrochemistry

雑誌

Bioscience, Biotechnology, and Biochemistry (ISSN:09168451)

巻号頁・発行日

vol.70, no.2, pp.325-331, 2006 (Released:2006-02-23)

参考文献数

27

被引用文献数

60

---

Cells must balance energy-efficient growth with the ability to adapt rapidly to sudden changes in their environment. For example, in an environment rich in amino acids, cells do not expend energy for making amino acid biosynthetic enzymes. However, if the environment becomes depleted of amino acids (nutritional downshift), cells will be exposed to a lack of both the amino acid biosynthetic enzymes and the amino acids required to make these enzymes. To solve this dilemma, cells must use their own proteins as sources of amino acids in response to the nutritional downshift. Once amino acid biosynthetic enzymes start to accumulate, the cell is able to produce its own amino acids, and a new growth phase begins. In Escherichia coli, amino acid starvation leads to the accumulation of an unusual molecule, polyphosphate (polyP), a linear polymer of many hundreds of orthophosphate residues. Protein degradation in this bacterium appears to be triggered by the accumulation of polyP. PolyP forms a complex with the ATP-dependent Lon protease. The formation of a complex then enables Lon to degrade free ribosomal proteins. Certain very abundant ribosomal proteins can be the sacrificial substrates targeted for degradation at the onset of the downshift. Here I propose to call the polyP-Lon complex the “stringent protease,” and I discuss new insights of protein degradation control in bacteria.

著者

Hirano Shinya Miyashita Kazuo Ota Toru NISHIKAWA Masazumi MARUYAMA Kazuki NAKAYAMA Suguru

出版者

社団法人日本農芸化学会

雑誌

Bioscience, biotechnology, and biochemistry (ISSN:09168451)

巻号頁・発行日

vol.61, no.2, pp.281-285, 1997-02-23

被引用文献数

8 21

---

The oxidative stability of ethyl linoleate (LA), ethyl linolenate (LN), and ethyl docosahexaenoate (DHA) in an aqueous solution was compared by measuring the decrease in unoxidized substrate and the formation of total hydroperoxides, conjugated dienes, and monohydroperoxides (MHPs). The highest stability was shown by DHA, this being followed by LN and LA in both cases when using Fe^<2+>-ascorbic acid and 2, 2'-azobis(2, 4-dimethylvaleronitrile) (AMVN) as a initiator, while the reverse order of oxidative stability was obtained when the esters were oxidized in chloroform or ethanol with AMVN. The stability of MHPs in an aqueous solution also increased with increasing degree of unsaturation. HPLC analyses showed little difference in the positional distribution of MHP isomers between aqueous oxidation and autoxidation in the air. This result suggests no selective abstraction of hydrogen atoms from the bisallylic positions of polyunsaturated fatty acid in an aqueous phase. The product ratio of hydoroperoxy epidioxides to MHPs in the aqueous oxidation of LN was lower than that of autoxidized LN in the air, showing the rapid decomposition of epidioxides in an aqueous solution.

著者

Zhaorigetu Siqin Sasaki Masahiro Watanabe Hiromitsu KATO Norihisa

出版者

社団法人日本農芸化学会

雑誌

Bioscience, biotechnology, and biochemistry (ISSN:09168451)

巻号頁・発行日

vol.65, no.10, pp.2181-2186, 2001-10-23

参考文献数

31

被引用文献数

10 97

---

This study was done to discover the underlying mechanism of the inhibitory effect of sericin against colon tumorigenesis. Mice were fed a diet with 30 g/kg sericin for 115 d, and given a weekly injection of 1,2-dimethylhydrazine (10 mg/kg body weight) for the initial 10 wk. Dietary supplemental sericin caused a 62% reduction in the incidence of colonic adenoma (P<0.05), but did not affect the incidence of colonic adenocarcinoma. Sericin intake significantly reduced the number of colon adenomas. Consumption of sericin significantly reduced the BrdU labeling index of colonic proliferating cells and the expression of colonic c-myc and c-fos. The levels of colonic 8-hydroxydeoxyguanosine, 4-hydroxynonenal, and inducible nitric oxide synthase protein were significantly suppressed by sericin. The results suggest that dietary sericin suppresses the development of colon tumors by reducing oxidative stress, cell proliferation, and nitric oxide production.