Son, Young Min;Song, Ki-Duk;Park, Sung-Moo;Han, Seung Hyun;Yun, Cheol-Heui
Journal of Microbiology and Biotechnology
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v.23
no.7
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pp.1023-1030
/
2013
Lipoteichoic acid (LTA), uniquely expressed on gram-positive bacteria, is recognized by Toll-like receptor 2 (TLR2) on not only antigen-presenting cells but also activated T cells. Therefore, it is reasonable to assume that LTA is acting on T cells. However, little is known about the effect of LTA on T-cell regulation. In the present study, we investigated the immunomodulatory effects of LTA on $CD4^+$ T cells. Effector $CD4^+$ T cells, induced after co-culture with S. aureus-pulsed dendritic cells, produced high levels of interferon-${\gamma}$, CD25, CD69, and TLRs 2 and 4. When effector $CD4^+$ T cells were treated with LTA, the expressions of the membrane-bound form of transforming growth factor (TGF)-${\beta}$ and forkhead box P3 increased. Coincidently, the proliferation of effector $CD4^+$ T cells was declined after LTA treatment. When TGF-${\beta}$ signaling was blocked by the TGF-${\beta}$ receptor 1 kinase inhibitor, LTA failed to suppress the proliferation of effector $CD4^+$ T cells. Therefore, the present results suggest that LTA suppresses the activity of effector $CD4^+$ T cells by enhancing TGF-${\beta}$ production.
Background: It has been recently noticed that type 2 diabetes (T2D), one of the most common metabolic diseases, causes a chronic low-grade inflammation and activation of the innate immune system that are closely involved in the pathogenesis of T2D. Cordyceps militaris, a traditional medicinal mushroom, produces a component compound, cordycepin (3'-deoxyadenosine). Cordycepin has been known to have many pharmacological activities including immunological stimulating, anti-cancer, and anti-infection activities. The molecular mechanisms of cordycepin in T2D are not clear. In the present study, we tested the role of cordycepin on the anti-diabetic effect and anti-inflammatory cascades in LPS-stimulated RAW 264.7 cells. Methods: We confirmed the levels of diabetes regulating genes mRNA and protein of cytokines through RT-PCR and western blot analysis and followed by FACS analysis for the surface molecules. Results: Cordycepin inhibited the production of NO and pro-inflammatory cytokines such as IL-$1{\beta}$, IL-6, and TNF-${\alpha}$ in LPS-activated macrophages via suppressing protein expression of pro-inflammatory mediators. T2D regulating genes such as $11{\beta}$-HSD1 and PPAR${\gamma}$ were decreased as well as expression of co-stimulatory molecules such as ICAM-1 and B7-1/-2 were also decreased with the increment of its concentration. In accordance with suppressed pro-inflammatory cytokine production lead to inhibition of diabetic regulating genes in activated macrophages. Cordycepin suppressed NF-${\kappa}B$ activation in LPS-activated macrophages. Conclusion: Based on these observations, cordycepin suppressed T2D regulating genes through the inactivation of NF-${\kappa}B$ dependent inflammatory responses and suggesting that cordycepin will provide potential use as an immunomodulatory agent for treating immunological diseases.
Objective: To investigate the effects of dietary supplementation with different levels and molecular weights of fungal ${\beta}$-glucan on productive performances, health, carcass traits and meat quality in broilers. Methods: Two hundred and ten of one-day-old chicks with equal sex were assigned to seven experimental groups in $2{\times}4$ factorial arrangement. These groups were supplemented with (0, 10, 30, and 60 ppm) of molecular weight 1-3, 1-6 ${\beta}$-glucan (low or high). High molecular weight ${\beta}$-glucan (H: 943 kDa) was obtained from Ophiocordyceps dipterigena BCC 2073, whereas H with ${\gamma}$-Irradiation treatment was performed to achieve low molecular weight ${\beta}$-glucan (L: 8 kDa). Results: There was no statistical significance in productive performances, apparent digestibility and interaction between fixed factors along 42 days of experiment (p>0.05). A higher caecal amylase activity was present in the group that received L, while there was a dramatic decrease in H and the control groups, respectively (p<0.05). The increase of supplemental dose increased caecal amylase activity (p<0.05). Immunomodulatory effects from L was revealed by the marked increase of phagocytic activity, relative weight of thymus and bursa of fabricius (p<0.05). Similarly, the additive dose at 30 ppm provided the same results, whereas the only significant difference with supplementation at 60 ppm was an increase in phagocytic activity (p<0.05). Interestingly, villi height of broilers fed L was higher than other groups (p<0.05). The treatments did not influence haematology, blood chemistry, antibody production level against vaccination, carcass traits and meat quality (p>0.05). Conclusion: The supplementation of L at 30 ppm was suggested to achieve benefits of immune modulation without adverse effects on other parameters.
Purpose: Sargassum horneri (S. horneri) is a species of brown macroalgae that is common along the coast of Japan and Korea. The present study investigated the immuno-modulatory effects of different types of S. horneri extracts in RAW264.7 macrophages. Methods: S. horneri was extracted by three different methods, hot water extraction, 50% ethanol extraction, and supercritical fluid extraction. Cell viability was then measured by MTT assay, while the production levels of tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$), interleukin-6 (IL-6), and nitric oxide (NO) were measured by enzyme-linked immunosorbent assay and Griess assay, respectively. The expression and activation levels of inducible NO synthase (iNOS), mitogen-activated protein kinase (MAPK) and nuclear factor ${\kappa}B$ ($NF-{\kappa}B$) were examined by western blot analysis. Results: The three different S. horneri extracts were nontoxic against RAW 264.7 cells up to $50{\mu}g/mL$, among which treatment with hot water extract (HWE) of S. horneri significantly enhanced the production of TNF-${\alpha}$, IL-6, and NO in a dose-dependent manner. Hot water extract of S. horneri also increased the expression level of iNOS, suggesting that up-regulation of iNOS expression by HWE of S. horneri was responsible for the induction of NO production. In addition, treatment of RAW 264.7 macrophages with HWE of S. horneri increased the phosphorylation levels of ERK, p38 and JNK. Furthermore, the activation and subsequent nuclear translocation of $NF-{\kappa}B$ was enhanced upon treatment with HWE of S. horneri, indicating that HWE of S. horneri activates macrophages to secrete TNF-${\alpha}$, IL-6 and NO and induces iNOS expression via activation of the $NF-{\kappa}B$ and MAPKs signaling pathways. Conclusion: Taken together, these findings suggest that HWE of S. horneri possesses potential as a functional food with immunomodulatory activity.
Jung, Hoo Kil;Kim, Sun Jin;Seok, Min Jeong;Cha, Hyun Ah;Yoon, Seul Ki;Lee, Nah Hyun;Kang, Kyung Jin
Journal of Dairy Science and Biotechnology
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v.33
no.2
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pp.111-118
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2015
Probiotic, prebiotic, and synbiotic substances as well as microorganisms were added to infant formula in an attempt to influence the intestinal microflora with an aim to stimulate the growth of lactic acid bacteria, especially bifidobacteria and lactobacilli. Over the last 10 years, new synbiotic infant formulas containing probiotics and prebiotics have been proposed in order to simulate the effect of breast-feeding on the intestinal microflora. Owing to their synergistic effect, the new synbiotics are expected to be more helpful than using probiotics and prebiotics individually. Maintenance of the viability of the probiotics during food processing and the passage through the gastrointestinal tract should be the most important consideration, since a sufficient number of bacteria ($10^8cfu/g$) should reach the intended location to have a positive effect on the host. Storage conditions and the processing technology used for the manufacture of products such as infant formula adversely affect the viability of the probiotics. When an appropriate and cost-effective microencapsulation methodology using the generally recognized as safe (GRAS) status and substances with high biological value are developed, the quality of infant formulas would improve. The effect of probiotics may be called a double-effect, where one is an immunomodulatory effect, induced by live probiotics that advantageously alter the gastrointestinal microflora, and the other comprises anti-inflammatory responses elicited by dead cells. At present, a new terminology is required to define the dead microorganisms or crude microbial fractions that positively affect health. The term "paraprobiotics" (or ghost probiotics) has been proposed to define dead microbial cells (not damaged or broken) or crude cell extracts (i.e., cell extracts with complex chemical composition) that are beneficial to humans and animals when a sufficient amount is orally or topically administered. The fecal microflora of bottle-fed infants is altered when the milk-based infant formula is supplemented with probiotics or prebiotics. Thus, by increasing the proportion of beneficial bacteria such as bifidobacteria and lactobacilli, prebiotics modify the fecal microbial composition and accordingly regulate the activity of the immune system. Therefore, considerable attention has been focused on the improvement of infant formula quality such that its beneficial effects are comparable to those of human milk, using prebiotics such as inulin and oligosaccharides and potential specific probiotics such as bifidobacteria, which selectively stimulate the proliferation of beneficial bacteria in the microflora and the indigenous intestinal metabolic activity of the microflora.
Kang, In Soon;Kim, Rang Ie;Kim, Gwang Sub;Kim, Na Ri;Shin, Joong Yup;Kim, Chaekyun
Journal of the Korean Society of Food Science and Nutrition
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v.44
no.11
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pp.1629-1636
/
2015
The edible mushroom Agaricus blazei Murill is known to have many physiological functions, including antitumor, antiviral, and anti-inflammatory effects. Aqueous extracts were obtained by extracting A. blazei in water at $90^{\circ}C$ for 15 h, followed by spray-drying with dextran at a 70:30 ratio. In this study, we examined the immunomodulatory effect of A. blazei Murill water extract (ABM) in BALB/c mice. Mice were administered orally with 4, 20, and 100 mg/kg of ABM for 21 days. ABM-treated mice did not show significant differences in body and organ weights compare to saline-treated control mice. Splenocytes isolated from ABM-administered mice revealed similar levels of cellularity and proliferation compared to control mice, whereas they showed increased natural killer (NK) cell activity and decreased IL-4 and IL-12 production. Different from in vivo results, splenocytes isolated from normal mice showed increased proliferation and $INF-{\gamma}$ production following ABM treatment in vitro. In addition, ABM treatment enhanced macrophage proliferation and nitric oxide (NO) production in a dose-dependent manner. However, ABM had no effect on LPS-induced NO production. These results suggest that A. blazei modulates immune function by increasing NK cell activity and macrophage function.
The purpose of this study was to investigate the immunomodulatory effect of Ulva pertusa kjellman extract after undergoing a low temperature and high-pressure extraction process. First, the extracts obtained under the extraction conditions of 150 MPa and $80^{\circ}C$showed a relatively high antioxidant activity, with 90% super oxide radical activity compared to the extracts from conventional extraction process with water at $100^{\circ}C$. This extract also improved the growth of both human immune B and T cells up to $14.5{\times}10^4$ cells/mL and $14.2{\times}10^4$ cells/mL compared to $9.1{\times}10^4$ cells/mL in adding the extracts from conventional processes. It was found that the extracts obtained at 100 MPa and $60^{\circ}C$ showed better activities in NK cell growth and NO production from macrophage as $11.8{\times}10^2$ cells/mL and 30.0 ${\mu}M$. Overall, the extracts from high pressure and low temperature extraction process had relatively higher immune activation activity, possibly because the low temperature and high pressure extraction process may have higher yields of active compounds and have less damage to useful ingredients from relatively weak marine natural resources, such as Ulva pertusa kjellmann than that from the conventional extraction system.
Kim, Do-Soon;Park, Jung-Eun;Cho, Hyun-Wook;Joo, Woo-Hong;Yee, Sung-Tae
Journal of Life Science
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v.17
no.3
s.83
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pp.427-434
/
2007
Dendritic cells (DCs) play a pivotal roles in the initiation of T cell-mediated immune responses, making them an attractive in immuno vaccines. Angelica gigas and Cnidium officinale were a medicinal herb widely used in Asian countries. In this study, we examined the effects of A. gigas and C. officinale extracts on the DCs functional maturation and phono-type. Immature DCs were cultured in the presence of GM-CSF and IL-4, and the generated immature DCs were stimulated with OVA in the presence or absence A. gigas and C. officinale extracts, respectively, for 24 hours. The antigen-presenting capacity of A. gigas and C. officinale extracts-treated DCs as analyzed by $CD4^+$ helper T cell clone (OVA-specific) proliferation and cytokines (IL-2 and $IFN-{\gamma}$) production were significantly increased. But A. gigas and C. officinale extracts were not directly effected $CD4^+$ helper T cell clone function. Also, the expression of surface co-stimulatory molecules, including major histocompatibility complex (MHC) class II, CD86 and CD11c, is increased on DCs that were stimulated with A. gigas and C. officinale extracts. These results indicate the immunomodulatory properties of A. gigas and C. officinale extracts, which might be medical supplies or health foods.
Objective: RNA epigenetic modifications play an important role in regulating immune response of mammals. Bovine mastitis induced by Staphylococcus aureus (S. aureus) is a threat to the health of dairy cattle. There are numerous RNA modifications, and how these modification-associated enzymes systematically coordinate their immunomodulatory effects during bovine mastitis is not well reported. Therefore, the role of common RNA modification-related genes (RMRGs) in bovine S. aureus mastitis was investigated in this study. Methods: In total, 80 RMRGs were selected for this study. Four public RNA-seq data sets about bovine S. aureus mastitis were collected and one additional RNA-seq data set was generated by this study. Firstly, quantitative trait locus (QTL) database, transcriptome-wide association studies (TWAS) database and differential expression analyses were employed to characterize the potential functions of selected enzyme genes in bovine S. aureus mastitis. Correlation analysis and weighted gene co-expression network analysis (WGCNA) were used to further investigate the relationships of RMRGs from different types at the mRNA expression level. Interference experiments targeting the m6 A demethylase FTO and utilizing public MeRIP-seq dataset from bovine Mac-T cells were used to investigate the potential interaction mechanisms among various RNA modifications. Results: Bovine QTL and TWAS database in cattle revealed associations between RMRGs and immune-related complex traits. S. aureus challenged and control groups were effectively distinguished by principal component analysis based on the expression of selected RMRGs. WGCNA and correlation analysis identified modules grouping different RMRGs, with highly correlated mRNA expression. The m6 A modification gene FTO showed significant effects on the expression of m6 A and other RMRGs (such as NSUN2, CPSF2, and METTLE), indicating complex co-expression relationships among different RNA modifications in the regulation of bovine S. aureus mastitis. Conclusion: RNA epigenetic modification genes play important immunoregulatory roles in bovine S. aureus mastitis, and there are extensive interactions of mRNA expression among different RMRGs. It is necessary to investigate the interactions between RNA modification genes regulating complex traits in the future.
Journal of the Korean Society of Food Science and Nutrition
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v.45
no.11
/
pp.1564-1570
/
2016
The present study investigated the immunomodulatory effects of high-purity ${\beta}$-1.3/1.6-glucan on macrophages, natural killer (NK) cells, and T cell-mediated factors. Effect of high-purity ${\beta}$-1.3/1.6-glucan on cytotoxicity in macrophages was investigated. Using macrophages, cytotoxicity of high-purity ${\beta}$-1.3/1.6-glucan was evaluated by MTT assay. We treated high-purity ${\beta}$-1.3/1.6-glucan at concentrations of 10, 50, 100, 150, 200, and $250{\mu}g/mL$ in macrophages. High-purity ${\beta}$-1.3/1.6-glucan did not affect macrophage viability. Phagocytic activity was assessed using zymosan. Activity of high-purity ${\beta}$-1.3/1.6-glucan on macrophages significantly increased as compared with zymosan. We treated high-purity ${\beta}$-1.3/1.6-glucan to murine NK cells co-incubated with YAC-1 cells. High-purity ${\beta}$-1.3/1.6-glucan resulted in significantly increased activity of NK cells as compared with the control. In addition, treatment of macrophages with high-purity ${\beta}$-1.3/1.6-glucan resulted in significantly increased activity of T cell-mediated cytokine (IL-2, IL-12, $IFN-{\gamma}$, and $TNF-{\alpha}$) levels and CD4+/CD8+ T cells as compared with the control. In conclusion, high-purity ${\beta}$-1.3/1.6-glucan could enhance the immune response through activation of macrophages, NK cells, and T cell-mediated factors.
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