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  • Title/Summary/Keyword: ANTIBACTERIAL ACTIVITY

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The Inhibition of Oxidative Stress by Chios Gum Mastic is Associated with Autophagy

  • Lee, Bo-Young;Lee, Kee-Hyun;Kim, In-Ryoung;Kim, Yong-Ho;Park, Hae-Ryoun;Park, Bong-Soo
    • International Journal of Oral Biology
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    • v.39 no.2
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    • pp.65-73
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    • 2014
  • Chios Gum Mastic (CGM) is a natural resin extracted from the leaves of Pistacia lentiscus, a plant endemic to the Greek island of Chios. It has been used by traditional healers, and it has antibacterial, antifungal properties, and therapeutic benefits for the skin. The CGM reduces the formation of dental plaque and bacterial growth in oral saliva, and recent studies have demonstrated the role of antioxidant activity of CGM. Although CGM has been widely investigated, its protective effect against oxidative-damage to keratinocytes, as well as the relationship between CGM and autophagy, has not been investigated. The aim of this study was to assess the protective effect of CGM against H2O2-induced oxidative stress and to evaluate the autophagic features induced by CGM in human keratinocytes. The pretreatment with CGM significantly reduced apoptosis in H2O2-exposed HaCaT cells. It promoted the degradation of caspase-3, caspase-8, and caspase-9; and it induced the formation of the processed PARP. The treatment with CGM caused an increase in vesicle formation compared to control group. The level of p62 was reduced and the conversion of LC3-I to LC3-II was increased in CGM treated HaCaT cells. Also, the treatment with CGM increased cleavage of ATG5-ATG12 complex. In summary, CGM helps the cells to survive under stressful conditions by preventing apoptosis and enhancing autophagy. Besides, the present investigation provides evidence to support the antioxidant potential of CGM in vitro and opens up a new horizon for future experiments.

Anti-biofouling properties of silver nano-particle coated artificial light-weight aggregates (은 나노 입자가 코팅된 인공경량골재의 생물오손 방지 특성)

  • Kim, Seongyeol;Kim, Yooteak;Park, Yongjoon
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.25 no.5
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    • pp.212-217
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    • 2015
  • Ships and marine structures have a lot of problems in their high maintenance and operating cost by biofouling. A biofouling occurrs by the adhesion of marine microorganism, algae and bacteria. In this study, the aim is to prevent or to reduce the biofouling phenomena through silver nano-particle coating on artificial light-weight aggregates and geopolymer. The antibacterial activity on them is tested according to ASTM E2149-2013a. The test results showed, it is estimated that silver nano-particles removed 99.99 % of bacteria. Specimens were set up in the sea side of field test area in Korea Institute of Ocean Science and Technology (KIOST) and have been observed for five months. The anti-biofouling effect and difference in weight change rate have been detected two months later after the installation. Because silver nanoparticles inhibit bacterial growth and kill the cells by destroying bacterial membranes, silver nano-particle coating on artificial lightweight aggregates is a well-suited and eco-friendly method for preventing biofouling in the sea up to 5 months.

Effects of Cosmetics and Their Preservatives on the Growth and Composition of Human Skin Microbiota (피부 미생물총의 생장과 구성에 대한 화장품과 그 방부제의 영향)

  • Jeong, Jin-Ju;Kim, Dong-Hyun
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.41 no.2
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    • pp.127-134
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    • 2015
  • We investigated the growth-inhibitory activities of cosmetics and their preservatives against pathogens and resident skin bacteria. Of the tested cosmetics, preservatives such as parabens, 1,2-hexanediol, phenoxyethanol-contained toner, emulsion, cream and baby cream exhibited potent antibacterial effects against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Parabens, 1,2-hexanediol and phenoxyethanol inhibited the growth of pathogens, as well as skin-resident bacteria such as Staphilococcus epidermidis, Shigella flexneri, Enterobacter aerogenes and so on. The application of a basic cream containing phenoxyethanol to human skin was shown to disturb the skin microbiota: at the phylum level, Proteobacteria increased and at species level, 4P004125_s increased and Propionibacterium humerusii decreased. Based on these findings, parabens, 1,2-hexanediol and phenoxyethanol have antimicrobial activity and cosmetics containing phenoxyethanol may disturb skin microbiota.

Quantitative Analysis of Allylmethyl Sulfide, Dimethyl Disulfide, and Dipropyl Sulfide in Biopesticides Containing Allium sativum Extract Using Gas Chromatography Mass Spectrometry-Head Space Sampler (Head-space GC-MS를 활용한 마늘추출물 함유 유기농자재 중 Allylmethyl Sulfide, Dimethyl Disulfide 및 Dipropyl Sulfide 분석)

  • Lim, Sung-Jin;Oh, Young-Tak;Kim, Jin-Hyo;Choi, Geun-Hyoung;Park, Byung-Jun
    • Korean Journal of Environmental Agriculture
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    • v.34 no.3
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    • pp.217-222
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    • 2015
  • BACKGROUND: Garlic (Allium sativum) contains polyphenols and sulfur compounds that are recognized as antioxidant, antithrombotic, anticancer, antibacterial, antimicrobial, nematicidal, and insecticidal activity. For this reason, the Environmentally-friendly Agriculture Promotion Act allowed the garlic extract as commercial biopesticide material for crop protection, nine commercial biopesticides containing A. sativum extract have been marketed in Korea. METHODS AND RESULTS: The determination of allylmethyl sulfide (AMS), dimethyl disulfide (DMDS), and dipropyl sulfide (DPS) in biopesticides containing A. sativum extract was developed and validated by gas chromatography (GC) mass spectrometry (MS) with head-space sampler. The developed method was validated, and the limit of quantification (LOQ) and recovery rates of AMS, DMDS, and DPS were 0.08, 0.32, and 0.09 mg/L and 90.3-91.3, 86.2-88.3, and 87.6-89.5%, respectively. From the nine commercial biopesticide samples, contents of AMS, DMDS, and DPS were analyzed using the developed method and results showed

Effects of organic acids on prevention against S. Typhimurium in weaning pigs (이유자돈에서 유기산제의 S. Typhimurium에 대한 효과)

  • Yoon, Hyun-Keun;Kim, Yeong-Hun;Han, Jeong-Hee
    • Korean Journal of Veterinary Service
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    • v.32 no.1
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    • pp.77-82
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    • 2009
  • Salmonella (S.) Typhimurium infection in pigs is a major source of human foodborne salmonellosis. Recently, the swine industry in Korea has been suffered from salmonellosis causing severe economic loss to farms. Organic acids have antibacterial activity which prevents bacteria from multiplying by reducing the pH in the gastrointestinal tract. The aim of the present study is to evaluate whether Salstop(R) mixed with organic acids is able to have influence on growth performance and whether it prevents against S. Typhimurium in weaning pigs. Four experimental treatments were examined: general diet added with 0.3% of Salstop(R) after S. Typhimurium (1.0×1010CFU/ml) challenge, group A; commercial feed after Salmonella (1.0×1010CFU/ml) challenge, group B; commercial feed and Salstop(R), group C; commercial feed, Group D. At the end of the study, no significant differences in daily body weight gain and feed intake were observed between groups treated with Salstop(R) and groups treated without, whereas feed conversion ratio (FCR) tended to be improved in groups treated with Salstop(R) between days 1 to 14. Serological and microbiological evolution of the infection were examined by ELISA and microbiological culture from serums and fecal samples, respectively. In groups that challenged by S. Typhimuriums, the group without Salstop(R) showed higher prevalence and bacterial shedding compared to the groups treated with Salstop(R). Our results suggest that the administration of Salstop(R) could be used to promote feed efficiency and to reduce the prevalence of salmonellosis in weaners.

Effect of a mixture of Galla rhois and Cinnamomum cassia extracts on susceptibility to the colonization of Campylobacter jejuni in broiler chickens

  • Cho, Byung-Wook;Lee, Soo-Mi;Cha, Chun-Nam;Yoo, Chang-Yeol;Son, Song-Ee;Kim, Suk;Lee, Hu-Jang
    • Korean Journal of Veterinary Research
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    • v.56 no.1
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    • pp.9-14
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    • 2016
  • The present study evaluated the effects of a mixture of Galla rhois and Cinnamomum cassia extracts (GCE) (1 : 1, w/w) on susceptibility to the colonization of Campylobacter (C.) jejuni in broilers. Eighty two-week-old broilers (n = 20 per group) were used to estimate the efficacy of GCE against C. jejuni infection via drinking water. Antibacterial activity testing revealed that the minimum bactericidal concentration of GCE against C. jejuni was 2.5 mg/mL. Broilers challenged with C. jejuni were administered 0.0 (Non-GCE), 2.5 (GCE-2.5), 5.0 (GCE-5.0) and 10.0 g/L (GCE-10) GCE for 7 days, and the cecal contents were collected from five broilers per group on the 1st, 3rd, 5th, and 7th day post-treatment. On day 3 post-administration, the number of C. jejuni in GCE-5.0 (p < 0.05) and GCE-10 (p < 0.01) was significantly decreased relative to Non-GCE, while on day 7 those in all GCE-treated groups were significantly decreased compared to the Non-GCE group (p < 0.001). Hematological and blood biochemical analysis revealed no significant differences in parameters between the Non-GCE and GCE-treated groups. Based on the results of the present study, GCE was identified as a safe and alternative candidate to suppress C. jejuni colonization in broilers.

In Vitro Inhibitory Effect of Licoricidin on Human Cytochrome P450s

  • Kim, Sunju;O, Heungchan;Kim, Jeong Ah;Lee, Seung Ho;Lee, Sangkyu
    • Mass Spectrometry Letters
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    • v.5 no.3
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    • pp.84-88
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    • 2014
  • Licoricidin isolated from Glycyrrhiza uralensis is known to have anticancer, anti-nephritic, anti-Helicobacter pylori, and antibacterial effects. In this study, a cocktail probe assay and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to investigate the modulating effect of licoricidin on cytochrome P450 (CYP) enzymes in human liver microsomes. When licoricidin was incubated at 025μm with CYP probes for 60 min at 37C, it showed potent inhibitory effects on CYP2B6-catalyzed bupropion hydroxylation and CYP2C9-catalyzed diclofenac 4'-hydroxylation with half maximal inhibitory concentration (IC50) values of 3.4 and 4.0μm, respectively. The inhibition mode of licoricidin was revealed as competitive, dose-dependent, and non-time-dependent, and following the pattern of Lineweaver-Burk plots. The inhibitory effect of licoricidin has been confirmed in human recombinant cDNA-expressed CYP2B6 and 2C9 with IC50 values of 4.5 and 0.73μm, respectively. In conclusion, this study has shown the potent inhibitory effect of licoricidin on CYP2B6 and CYP2C9 activity could be important for predicting potential herb-drug interactions with substrates that mainly undergo CYP2B- and CYP2C9-mediated metabolism.

Synergistic effect of xylitol and ursolic acid combination on oral biofilms

  • Zou, Yunyun;Lee, Yoon;Huh, Jinyoung;Park, Jeong-Won
    • Restorative Dentistry and Endodontics
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    • v.39 no.4
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    • pp.288-295
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    • 2014
  • Objectives: This study was designed to evaluate the synergistic antibacterial effect of xylitol and ursolic acid (UA) against oral biofilms in vitro. Materials and Methods: S. mutans UA 159 (wild type), S. mutans KCOM 1207, KCOM 1128 and S. sobrinus ATCC 33478 were used. The susceptibility of S. mutans to UA and xylitol was evaluated using a broth microdilution method. Based on the results, combined susceptibility was evaluated using optimal inhibitory combinations (OIC), optimal bactericidal combinations (OBC), and fractional inhibitory concentrations (FIC). The anti-biofilm activity of xylitol and UA on Streptococcus spp. was evaluated by growing cells in 24-well polystyrene microtiter plates for the biofilm assay. Significant mean differences among experimental groups were determined by Fisher's Least Significant Difference (p < 0.05). Results: The synergistic interactions between xylitol and UA were observed against all tested strains, showing the FICs < 1. The combined treatment of xylitol and UA inhibited the biofilm formation significantly and also prevented pH decline to critical value of 5.5 effectively. The biofilm disassembly was substantially influenced by different age of biofilm when exposed to the combined treatment of xylitol and UA. Comparing to the single strain, relatively higher concentration of xylitol and UA was needed for inhibiting and disassembling biofilm formed by a mixed culture of S. mutans 159 and S. sobrinus 33478. Conclusions: This study demonstrated that xylitol and UA, synergistic inhibitors, can be a potential agent for enhancing the antimicrobial and anti-biofilm efficacy against S. mutans and S. sobrinus in the oral environment.

Cryptotanshinone for Treating Acne Vulgaris

  • Kang, Nae-Gyu;Park, Ji-Eun;Song, Young-Sook;Kim, Jung-Ah;Park, Mun-Eok;Lee, Yong-Hwa;Cho, Wan-Goo;Kang, Seh-Hoon
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.28 no.1
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    • pp.99-115
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    • 2002
  • Tests of stability and toxicity, and clinical evaluation of anti-acne activity suggest that cryptotanshinone, a constituent of the roots of Salvia miltiorrhiza Bunge, is an effective active ingredient for acne vulgaris treatments. Acne vulgaris, called acne or pimples, is the most common disease of the pilosebaceous follicle unit of the skin. It affects nearly 80% of people between the ages of 11 and 30. Approximately 30% of teenagers have acne of sufficient severity to require medical treatment. Acne is a follicular disorder of the skin. It occurs in specialized pilosebaceous units on the face and body. Acne develops when these specialized follicles undergo pathologic alterations that result in the formation of non-inflammatory lesions (comedones) and inflammatory lesions (papules, pustules and nodules). An abnormality of keratinizing epithelium of these follicles, thought to be due to the action of sebum synthesized and secreted by the androgen-sensitive sebaceous glands, leads to inflammation induced by the follicular bacterium Propionibacterium acnes. Therapy involves treatments that modify these pathogenic factors and includes drugs with antikeratinizing, antibacterial and antiseborrheic actions. Acne vulgaris is a very frequent disease, seen primarily in adolescents, involving the sebaceous follicles. Acne vulgaris is characterized by a great variety of clinical inflammatory and non-inflammatory lesions: comedones, papules, pustules, nodules, cysts and scars. Acne vulgaris is a multi-factorial disease. Although its pathogenicity is unclear, extensive studies have shown that hyperseborrhea, superinfection by P. acnes and endocrinologic androgenic changes play a role in the development of acne vulgaris.

Review on the Acne Related Articles Published in Korean Medical Journals - Focusing on Experimental Studies Published after 2005 - (국내 한의 학술지에 게재된 여드름 관련 연구 동향- 2005년 이후 발표된 실험적 연구 논문 중심으로 -)

  • Yoon, Hee-Jung;Kim, Dong-Il
    • The Journal of Korean Obstetrics and Gynecology
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    • v.28 no.1
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    • pp.113-127
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    • 2015
  • Objectives: This study was performed to analyze the trend of acne-related experimental studies in Korean medicine. Methods: We searched 17 articles related with experimental study of acne, published Korean medical journals from 2005 to 2014. We classified all articles according to the journal and checked on the kind of herbs. All articles were categorized into two types: cell experimental study and animal experimental study. Results: 1. Total 17 papers were searched; 7 articles (41.2%) were published in the Journal of Korean Medical Ophthalmology, Otolaryngology, Dermatology, 4 articles (23.5%) were published in the Journal of Korean Institute of Pharmacopuncture, 3 articles (17.6%) were published in Korean Journal of Oriental Physiology and Pathology, 2 articles (11.8%) were published in Korean Journal of Herbology, and 1 article (5.9%) was published in the Journal of Korean Medicine. 2. Total 17 kind of herbs were used in the studies; 10 articles (58.8%) used single herb, 7 articles (41.2%) used complex herbs. 3. Total 17 articles were categorized 2 types; 16 cell experimental studies (94.1%), 1 animal experimental study (5.9%). 4. Experimental researches were mainly investigated using Raw 264.7 cell line and P. acnes. The levels of NO, iNOS, TNFα, PGE, COX-2, IL1β, IL-6, NF-kB were analyzed to confirm of herbs' antibacterial, anti-inflammatory, antioxidant activity. Conclusions: Searching for natural antibiotics, it is needed to do experimental studies continuously, and also needed to diversify the kind herbs and experimental bacteria.