• Korean Journal of Microbiology
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• v.39 no.1
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• pp.8-15
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• 2003

To evaluate the effects of slow release fertilizer and chemical dispersant on oil biodegradation, mesocosm studies were conducted on sand seashore. The rapid removal rates (85%) of aliphatic hydrocarbons and the simultaneous decreases of n-$C_{17}$/pristane (69%) and $n-C_{18}/phytane$ (61%) ratios by the addition of slow-release fertilizer (SRF) within 37 days of experiment indicated that SRF could enhance the oil degrading activity of indigenous microorganisms in sand mesocosm. Although the growth of heterotrophic bacteria and petroleumdegrading bacteria in the mesocosm treated with $Corexit 9527^{R}$ was stimulated, the biological oil removal based on the ratios of $Corexit 9527^{R}$ and $n-C_{18}/phytane$ was inhibited. Removal rates of aliphatic hydrocarbons (56%), and n-$C_{17}$/pristane (27%) and $n-C_{18}/phytane$ (17%) ratios by the addition of chemical dispersant $Corexit 9527^{R}$ were similar or lower than those values of control (50, 60, 46%), respectively. The biodegradation activity, however, when simultaneously treated with SRF and $Corexit 9527^{R}$, was not highly inhibited and even recovered after the elimination of chemical dispersant. From these results it could be concluded that the addition of SRF enhanced the oil removal rate in oligotrophic sand seashore and chemical dispersant possibly inhibit the oil biodegradation. Hence, in order to prevent the unrestrained usage of chemical dispersant in natural environments contaminated with oil, the National Contingency Plan of Oil Spill Response should be carefully revised in consideration of the application for bioremedaition techniques.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.3
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• pp.389-396
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• 2016

This study examined the improving effect of DFA IV obtained from bacterial fermentation on the gut health. The effects of the dietary DFA IV on the intestinal mass, short chain fatty acids production and pH were evaluated in vivo. Sprague-Dawley rats were fed the 0% (control) or 1% DFA IV supplemented diets for 3 weeks. Supplementation of DFA IV resulted in a significant increase in cecal tissue and wall weights. Together with the lowering of the cecal and colonic pH, the amount of acetate and butyrate increased by 1.6 and 3.2 fold of the control group in the cecum, respectively, in the rats fed DFA IV diets. The DFA IV diet also significantly increased the cecal lactate 1.5 fold compared to the control diet, indicating that dietary DFA IV stimulated the growth of lactic acid bacteria and bifidobacteria in the intestine. Based on the above results, it is concluded that the dietary DFA IV may be used as a putative prebiotic supplement.

• The Journal of Korean Medicine
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• v.27 no.4
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• pp.1-11
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• 2006

Objectives : We investigated the effect of Dohongsamul-tang (DHSMT) on the production of various cytokines in lipopolysaccaride (LPS) stimulated peripheral mononuclear cells (PBMCs) from CI patients. Methods: Cell viability was determined using MTT assay. ELISA was carried out for investigating $TNF-{\alpha}$, $IL-1{\beta}$, IL-6, IL-8, IL-4, and $TGF-{\beta}$ 1 Results : The amount of tumor necrosis factor (TNF)-${\alpha}$, interleukin (IL)-$1{\beta}$, IL-6, IL-8, IL-4, and transforming growth factor(TGF)-${\beta}$ 1 in PBMC culture supernatant significantly increased in the LPS treated cells compared to unstimulated cells. We show that DHSMT inhibited the production of TNF-${\alpha}$, IL-1${\beta}$, IL-6, IL-8, and IL-4 induced by LPS in a dose dependent manner. The maximal inhibition rate of the TNF-${\alpha}$, IL-1${\beta}$, IL-6, IL-8, and IL-4 production by pretreatment of DHSMT (1.0mg/ml) was 38.52 ${\pm}$ 2.5% (P < 0.01), 44.02 ${\pm}$ 3.5% (P < 0.05), 45.32 ${\pm}$ 2.3% (P < 0.01), 42.30 ${\pm}$ 3.1% (P < 0.05), and 49.70　${\pm}$　3.1%(P ＆lt; 0.05), respectively. On the other hand, DMSMT significantly increased the LPS-induced TGF-${\beta}$ 1 production(P<0.05). Conclusions : Taken together. these results suggest that DHSMT might have regulatory effects on cytokine production, which might explain its beneficial effect in the treatment of CI.

• Biomolecules & Therapeutics
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• v.28 no.6
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• pp.561-568
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• 2020

We examined the anticancer effects of a novel sirtuin inhibitor, MHY2256, on HCT116 human colorectal cancer cells to investigate its underlying molecular mechanisms. MHY2256 significantly suppressed the activity of sirtuin 1 and expression levels of sirtuin 1/2 and stimulated acetylation of forkhead box O1, which is a target protein of sirtuin 1. Treatment with MHY2256 inhibited the growth of the HCT116 (TP53 wild-type), HT-29 (TP53 mutant), and DLD-1 (TP53 mutant) human colorectal cancer cell lines. In addition, MHY2256 induced G0/G1 phase arrest of the cell cycle progression, which was accompanied by the reduction of cyclin D1 and cyclin E and the decrease of cyclin-dependent kinase 2, cyclin-dependent kinase 4, cyclin-dependent kinase 6, phosphorylated retinoblastoma protein, and E2F transcription factor 1. Apoptosis induction was shown by DNA fragmentation and increase in late apoptosis, which were detected using flow cytometric analysis. MHY2256 downregulated expression levels of procaspase-8, -9, and -3 and led to subsequent poly(ADP-ribose) polymerase cleavage. MHY2256-induced apoptosis was involved in the activation of caspase-8, -9, and -3 and was prevented by pretreatment with Z-VAD-FMK, a pan-caspase inhibitor. Furthermore, the autophagic effects of MHY2256 were observed as cytoplasmic vacuolation, green fluorescent protein-light-chain 3 punctate dots, accumulation of acidic vesicular organelles, and upregulated expression level of light-chain 3-II. Taken together, these results suggest that MHY2256 could be a potential novel sirtuin inhibitor for the chemoprevention or treatment of colorectal cancer or both.

• Journal of Applied Biological Chemistry
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• v.61 no.2
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• pp.125-130
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• 2018

The quality and microbiological characteristics of various Mul-kimchi prepared with addition of 0.02, 0.05, and 0.1% (w/v) chlorella water extract (CWE) were investigated during fermentation for 7 days at $10^{\circ}C$. The addition of CWE powder stimulated the growth of lactic acid bacteria and considerably improved the acid production. After 6 days fermentation, titratable acidity of CWE Mul-kimchi was 0.16-0.19% and was higher than that (0.14%) of Mul-kimchi made without CWE. The lactic acid bacterial counts were increased rapidly in CWE Mul-kimchi during fermentation for 4 days. The sensory quality of Mul-kimchi added with 0.05-0.1% CWE powder lightly enhanced in taste and overall acceptability among the tested Mul-kimchis preparations. When CWE Mul-kimchi preparations fermented for 6 days were incubated at $4^{\circ}C$ for 15 days, their titratable acidities were continuously increased up to 0.21-0.26% but number of viable lactic acid bacteria were well maintained above $10^7CFU/g$ through storage period.

• Korean Journal of Food Science and Technology
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• v.14 no.2
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• pp.151-155
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• 1982

Effects of vitamins, metabolic intermediates and several inorganic mineral salts on the biomass and lipid accumulation of Mucor plumbeus were investigated after 15 days of incubation at $37^{\circ}C$ under static culture condition. The optimum concentrations of various vitamins were ${\gamma}/l$ for biotin, and 0.01 g/l for nicotinic acid, pyridoxine, thiamine and riboflavin. Among them pyridoxine was the most stimulatory. The maximum felt weight and lipid content per 50ml medium were $2.82{\pm}0.14\;g$ and 62.8%. Triglyceride content of neutral lipid produced under this condition was 64.9%. The major fatty acids were oleic acid (50.0%), linoleic (23.8%) and palmitic acid (13.9%). Malonic acid was considered not to be desirable even though it stimulated the biomass and lipid accumulation because triglyceride content was lowered considerably comparing with control. $MgSO_4{\cdot}7H_2O$ was the most stimulatory among the various magnesium salts and its optimum concentration was 5 g/l. Mucor plumbeus did not require $NaH_2PO_4$ for the stimulation of felt and lipid production. However, the addition of $MnCl_2$ at the concentration of 2 g/l was stimulatory to show $2.76{\pm}0.28\;g$ of felt/50 ml and 56.4% lipid content, and 73.9% triglyceride in the neutral lipid.

• Korean Journal of Food Science and Technology
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• v.48 no.4
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• pp.378-383
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• 2016

The glasswort is an edible halophyte demonstrating various physiological effects including anti-inflammatory activity. In the present study, the effects of glasswort extracts on inflammatory events and interactions of THP-1 monocytes with intestinal epithelial cells were investigated. Five solvent fractions, including the ethylether fraction (Fr.E), were prepared from a 70% methanol extract of glasswort. THP-1 monocytes underwent differentiation by phorbol 12-myristate 13-acetate treatment and were then activated by lipopolysaccharide (LPS), which induced cyclooxygenase (COX)-2 expression. None of the glasswort fractions tested alone induced COX-2 in differentiated THP-1 cells. Fr.E, however, enhanced LPS-induced COX-2 expression in differentiated THP-1 cells. Culture media of THP-1 cells treated with each fraction stimulated the growth of normal intestinal INT-407 cells more prominently than that of HT-29 colon cancer cells. COX-2 expression in HT-29 cells was inhibited when the cells were exposed to the THP-1 culture medium treated with Fr.E. Thus, glasswort could modulate the interaction between immune cells and intestinal cells.

• Journal of Microbiology and Biotechnology
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• v.15 no.5
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• pp.1087-1093
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• 2005

The population diversity and seasonal changes of bacterial communities in rice soils were monitored using both culture-dependent approaches and molecular methods. The rice field plot consisted of twelve subplots planted with two genetically-modified (GM) rice and two non-GM rice plants in three replicates. The DGGE analysis revealed that the bacterial community structures of the twelve subplot soils were quite similar to each other in a given month, indicating that there were no significant differences in the structure of the soil microbial populations between GM rice and non-GM rice during the experiment. However, the DGGE profiles of June soil after a sudden flooding were quite different from those of the other months. The June profiles exhibited a few intense DNA bands, compared with the others, indicating that flooding of rice field stimulated selective growth of some indigenous microorganisms. Phylogenetic analysis of l6S rDNA sequences from cultivated isolates showed that, while the isolates obtained from April soil before flooding were relatively evenly distributed among diverse genera such as Arthrobacter, Streptomyces, Terrabacter, and Bacillus/Paenibacillus, those from June soil after flooding mostly belonged to the Arthrobacter species. Phylogenetic analysis of 16S rDNA sequences obtained from the soil by cloning showed that April, August, and October had more diverse microorganisms than June. The results of this study indicated that flooding of rice fields gave a significant impact on the indigenous microbial community structure; however, the initial structure was gradually recovered over time after a sudden flooding.

• Microbiology and Biotechnology Letters
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• v.40 no.2
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• pp.117-127
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• 2012

The beneficial effects of adipose-derived stem cell conditioned media (ADSC-CM) for skin regeneration have previously been reported, despite the precise mechanism of how ADSC-CM promotes skin regeneration remaining unclear. ADSC-CM contains various secretomes and this may be a factor in it being a good resource for the treatment of skin conditions. It is also known that ADSC-CM produced in hypoxia conditions, in other words Advanced Adipose-Derived Stem cell Protein Extract (AAPE), has excellent skin regenerative properties. In this study, a human primary skin cell was devised to examine how AAPE affects human dermal fibroblast (HDF) and human keratinocyte (HK), which both play fundamental roles in skin regeneration. The promotion of collagen formation by HDFs was observed at 0.32 mg/ml of AAPE. AAPE treatment significantly stimulated stress fiber formation. DNA gene chips demonstrated that AAPE in HKs (p<0.05) affected the expression of 133 identifiable transcripts, which were associated with cell proliferation, migration, cell adhesion, and response to wounding. Twenty five identified proteins, including MMP, growth factor and cytokines such as CD54, FGF-2, GM-CSF, IL-4, IL-6, VEGF, TGF-${\beta}2$, TGF-${\beta}3$, MMP-1, MMP-10, and MMP-19, were contained in AAPE via antibody arrays. Thus, AAPE might activate the HK biological function and induce the collagen synthesis of HDF. These results demonstrate that AAPE has the potential to be used for clinic applications aimed at skin regeneration.

• The Korean Journal of Physiology and Pharmacology
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• v.20 no.3
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• pp.305-314
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• 2016

Inflammatory and fibrotic responses are accelerated during the reperfusion period, and excessive fibrosis and inflammation contribute to cardiac malfunction. NecroX compounds have been shown to protect the liver and heart from ischemia-reperfusion injury. The aim of this study was to further define the role and mechanism of action of NecroX-5 in regulating inflammation and fibrosis responses in a model of hypoxia/reoxygenation (HR). We utilized HR-treated rat hearts and lipopolysaccharide (LPS)-treated H9C2 culture cells in the presence or absence of NecroX-5 ($10{\mu}mol/L$) treatment as experimental models. Addition of NecroX-5 significantly increased decorin (Dcn) expression levels in HR-treated hearts. In contrast, expression of transforming growth factor beta 1 ($TGF{\beta}1$) and Smad2 phosphorylation (pSmad2) was strongly attenuated in NecroX-5-treated hearts. In addition, significantly increased production of tumor necrosis factor alpha ($TNF{\alpha}$), $TGF{\beta}1$, and pSmad2, and markedly decreased Dcn expression levels, were observed in LPS-stimulated H9C2 cells. Interestingly, NecroX-5 supplementation effectively attenuated the increased expression levels of $TNF{\alpha}$, $TGF{\beta}1$, and pSmad2, as well as the decreased expression of Dcn. Thus, our data demonstrate potential antiinflammatory and anti-fibrotic effects of NecroX-5 against cardiac HR injuries via modulation of the $TNF{\alpha}/Dcn/TGF{\beta}1/Smad2$ pathway.