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Sapporo, Japan

Uchiyama H.,Aureo Science Co. | Iwai A.,Aureo Science Co. | Asada Y.,Aureo Co. | Muramatsu D.,Aureo Science Co. | And 7 more authors.
BMC Research Notes | Year: 2012

Background: The β(1!3),(1!6)-D-glucan extracellularly produced by Aureobasidium pullulans exhibits immunomodulatory activity, and is used for health supplements. To examine the effects of oral administration of the β(1!3),(1!6)-D-glucan to domestic animals, a small scale study was conducted using Holstein cows and newborn Japanese Black calves. Findings: Holstein cows of which somatic cell count was less than 3 × 105/ml were orally administered with or without the β-(1!3),(1!6)-D-glucan-enriched A. pullulans cultured fluid (AP-CF) for 3 months, and the properties of milk and serum cytokine expression were monitored. Somatic cell counts were not significantly changed by oral administration of AP-CF, whereas the concentration of solid non fat in the milk tended to increase in the AP-CF administered cows. The results of cytokine expression analysis in the serum using ELISA indicate that the expressions of tumor necrosis factor-α (TNF-α) and interleukin (IL)-6 in all cows which were orally administered with AP-CF became slightly lower than that of control cows after the two-month treatment. On the other hand, IL-8 expression tended to indicate a moderately higher level in all treated cows after the three-month administration of AP-CF in comparison with that of the control cows. Peripartum Japanese Black beef cows and their newborn calves were orally administered with AP-CF, and bacterial flora in the intestines of the calves were analyzed by T-RFLP (terminal restriction fragment length polymorphism). The results suggest that bacterial flora are tendentiously changed by oral administration of AP-CF. Conclusions: Our data indicated the possibility that oral administration of the β(1!3),(1!6)-D- glucan produced by A. pullulans affects cytokine expressions in the serum of Holstein cows, and influences bacterial flora in the intestines of Japanese Black calves. The findings may be helpful for further study on the efficacies of oral administration of β-(1!3),(1!6)-D-glucans on domestic animals. © 2012 Uchiyama et al.

Fujikura D.,Hokkaido University | Fujikura D.,Japan Science and Technology Agency | Chiba S.,Hokkaido University | Muramatsu D.,Hokkaido University | And 11 more authors.
PLoS ONE | Year: 2013

Infection of influenza A virus in mammals induces hyper lung pneumonia, which often causes lethal diseases. FasL is a specific ligand of Fas, which is a type-I transmembrane protein to induce cell death. Previously, it has been reported that the hyper induction of gene expression associated with Fas signal is observed in lethal influenza A virus infection. More importantly, it was also reported that functional mutation of the FasL gene protects the host against influenza A virus infection. These observations suggest that induction of FasL signal is functionally associated with the severity of influenza. However, regulation of the induction of FasL or Fas by influenza A virus infection is still unknown. Here, we demonstrated that FasL is induced after the viral infection, and inhibition of the Fas/FasL signal by treatment with a recombinant decoy receptor for FasL (Fas-Fc) increases the survival rate of mice after lethal infection of influenza A virus as well as functional mutation of the FasL gene in gld/gld mice. In addition, the induction level of FasL gene expression in the lung was correlated with the severity of influenza. We also showed that a variety of types of cells in the lung express FasL after the viral infection. Furthermore, type-I interferon induced by the viral infection was shown to be critical for induction of FasL protein expression in the lung. These findings suggested that expression of FasL protein induced by type-I IFN on the lung cell surface is critical to determine the severity of influenza. © 2013 Fujikura et al.

Kawata K.,Aureo Science Co. | Kawata K.,Aureo Co. | Iwai A.,Aureo Science Co. | Iwai A.,Aureo Co. | And 7 more authors.
PLoS ONE | Year: 2015

A β-glucan produced by Aureobasidium pullulans (AP-PG) is consisting of a β-(1,3)-linked main chain with β-(1,6)-linked glucose side residues. Various β-glucans consisting of β-(1,3)-linked main chain including AP-PG are believed to exhibit anti-tumor activities, and actually, anti-tumor activities of AP-PG in mice have been demonstrated. In this study, we demonstrate that stimulation with AP-PG induces TRAIL expression in mouse and human macrophage-like cell lines. TRAIL is known to be a cytokine which specifically induces apoptosis in transformed cells, but not in untransformed cells. The expression of TRAIL mRNA after stimulation with AP-PG was increased in RAW264.7 cells, Mono Mac 6 cells, and macrophage-differentiated THP-1 cells. The mRNA expression of TNF-α and FasL is only weakly increased after stimulation with AP-PG. The induction activity of TRAIL by curdlan, a bacterial β-glucan, was very similar to that by AP-PG in RAW264.7 cells, but weaker in macrophage-differentiated THP-1 cells. Activation of caspases was found in HeLa cells after treatment with the supernatant of cultured medium from AP-PG-stimulated Mono Mac 6 cells, and was inhibited by the anti-TRAIL neutralizing antibody. These findings suggest that the stimulation with AP-PG effectively induces TRAIL in macrophages, and that it may be related to apoptosis induction of tumor cells. © 2015 Kawata et al.

Muramatsu D.,Aureo Science Co. | Muramatsu D.,Hokkaido University | Iwai A.,Aureo Co. | Iwai A.,Hokkaido University | And 11 more authors.
PLoS ONE | Year: 2012

β-(1→3)-D-glucans with β-(1→6)-glycosidic linked branches produced by mushrooms, yeast and fungi are known to be an immune activation agent, and are used in anti-cancer drugs or health-promoting foods. In this report, we demonstrate that oral administration of Aureobasidium pullulans-cultured fluid (AP-CF) enriched with the β-(1→3),(1→6)-D-glucan exhibits efficacy to protect mice infected with a lethal titer of the A/Puerto Rico/8/34 (PR8; H1N1) strain of influenza virus. The survival rate of the mice significantly increased by AP-CF administration after sublethal infection of PR8 virus. The virus titer in the mouse lung homogenates was significantly decreased by AP-CF administration. No significant difference in the mRNA expression of inflammatory cytokines, and in the population of lymphocytes was observed in the lungs of mice administered with AP-CF. Interestingly, expression level for the mRNA of virus sensors, RIG-I (retinoic acid-inducible gene-I) and MDA5 (melanoma differentiation-associated protein 5) strongly increased at 5 hours after the stimulation of A. pullulans-produced purified β-(1→3),(1→6)-D-glucan (AP-BG) in murine macrophage-derived RAW264.7 cells. Furthermore, the replication of PR8 virus was significantly repressed by pre-treatment of AP-BG. These findings suggest the increased expression of virus sensors is effective for the prevention of influenza by the inhibition of viral replication with the administration of AP-CF. © 2012 Muramatsu et al.

Aoki S.,Aureo Science Co. | Iwai A.,Aureo Science Co. | Iwai A.,Aureo Co. | Kawata K.,Aureo Science Co. | And 7 more authors.
Journal of Functional Foods | Year: 2015

The Aureobasidium pullulans-produced β-glucan (AP-PG) is an immune stimulator, and believed to exhibit beneficial effects on health through its immune stimulating activity. Here, the effect of oral administration of AP-PG on high-fat diet (HFD)-induced atherosclerosis was evaluated using apolipoprotein E deficient mice, a widely used mouse model for atherosclerosis. The results demonstrated that HFD-induced development of atherosclerosis was significantly reduced in the AP-PG-treated mice when compared with that of the control mice. In serological analysis, blood levels of oxidized low-density lipoprotein cholesterol, a well-known risk factor for the development of atherosclerosis, were significantly reduced in the AP-PG-treated group of mice. Further, immunohistochemical analysis using MOMA-2 antibody showed that oral administration of AP-PG is effective in ameliorating vascular accumulation of macrophages. These data suggest the possibility that oral administration of AP-PG is effective in ameliorating HFD-induced development of atherosclerosis. © 2015 Elsevier Ltd.

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