• Journal of Microbiology and Biotechnology
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• 제14권5호
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• pp.1067-1070
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• 2004

In the course of screening for specific inhibitors against the mycelial form of Candida albicans from natural resources, we have isolated and identified A6792-1 from Streptomyces sp. A6792 by using several chromatographies. By spectral analyses, this compound was determined as 7-oxostaurosporine, having a structure of staurosporine aglycon noiety. 7-Oxostaurosporine exhibited a selective growth inhibitory activity against the mycelial form of Candida spp. up to $100\mu\textrm{g}/disc$ in bioassay. It also exhibited a specific antifungal activity against the mycelial form of Candida spp. including C. krusei, C. albicans, C. tropicalis, and C. lusitaniae with MICs ranging from 3.1 to $25\mu\textrm{g}/ml$ 7-Oxostaurosporine demonstrated no in vivo toxicity in SPF ICR mice. Therefore, this compound may have a considerable potential as an antifungal agent based on the preferential inhibition against growth of the mycelial form of Candida spp., dimorphic fungi.

• 구강회복응용과학지
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• 제32권4호
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• pp.274-279
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• 2016

목적: 치과 기공용 연마기 휠을 소독하기 위한 클로르헥시딘의 농도에 따른 캔디다균의 감염방지효과에 대해 알아보고자 하였다. 연구 재료 및 방법: 동일한 모형에서 제작된 상악 총의치를 캔디다균에 감염시키고, 서로 다른 농도의 클로르헥시딘 용액에 1시간 보관한 연마 휠과 멸균된 퍼미스와 증류수를 이용하여, 치과기공용 연마기로 연마하였다. 이후 멸균된 상악 총의치를 연이어 연마한 뒤 연마한 부위를 면봉으로 채취하여, 재배양후 칸디다균의 여부를 확인하였다. 결과: 클로르 헥시딘을 적용한 연마휠은 농도에 관계 없이 감염의 전파가 일어나지 않았으나, 증류수만을 사용한 연마휠에서는 감염의 전파가 나타났다. 결론: 의치 연마기 휠의 감염방지를 위해 클로르헥시딘 용액은 효과적이다.

• 대한치과보철학회지
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• 제31권1호
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• pp.19-27
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• 1993

For the purpose of this study was to determine the growth of Candide albicans on the surface of the resilient denture liners. The discs$(40\times40mm)$ of 2 resilient lining materals (Molloplast B, Mollosil) and one conventional acrylic resin (K-33) and one metal plate were processed and disinfected. Firstly, the test discs were placed into petri dish, and Candide albicans suspensions was overlayed on the test discs. And the test discs were incubated with intermitant shaking for 1 hour, 2 hours, 6 hours, 12 hours, 24 hours. After incubation, imprint culture method was achived and counted the colony on the agar plate. Secondly, the effect of denture cleansing agents on the growth of Candide alibicans on the resilient dentureliners was evaluated. The results were as follows : 1. The growth of Candida albicans on discs of Molloplast B and Mollosil was increased than that on discs of acrylic resin and metal plate (p<0.05). 2. As Candide albicans suspensions were incubated for 2 hours, the growth of Candida albicans on discs of Mollosil was increased than that on discs of Molloplast B (p<0.05), and the growth of Candide albicans on discs of metal plate was increased than that on discs of acrylic resin (p<0.05). 3. As Candide albicans suspensions were incubated for 6 hours, the growth of Candide albicans on discs of Mollosil was increased than that on discs of Molloplast B (p<0.05). 4. The growth of Candide albicans on discs of Mollosil and Molloplast B in treating denture cleansing agent was inhibited than control discs (p<0.05).

• Journal of Microbiology and Biotechnology
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• 제10권5호
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• pp.606-611
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• 2000

Dimorphic yeast Candida albicans reversibly switches between the form of yeast and hyphae depending on external conditions. We investigated possible roles of the myosin family in the growth and dimorphic switches of C. albicans with a general myosin ATPase inhibitor, 2,3-butanedione-2-monoxime (BDM). Transition to hyphae as well as proliferation by budding was completely inhibited by BDM at 16 mM. Presence of 16 mM BDM did not affect hyphae-to-bud transition but it blocked budding. The effects of BDM on yeast growth and dimorphic switches were reversible. More than 70% of the BDM-treated cells demonstrated defects in the amount and the polarized localization of F-actin as well as in the shape and migration of the nucleus, suggesting that myosin activities are needed in these cellular processes of C. albicans.

• Journal of Microbiology
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• 제37권2호
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• pp.117-122
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• 1999

Protective roles of antioxidant enzymes, copper-zinc superoxide dismutase (CuZnSOD), manganese superoxide dismutase (MnSOD), and catalase of Candida albicans against exogenous reactive oxygens and oxidative killing by macrophages were investigated. The initial growth of C. albicans was inhibited by reactive, oxygen-producing chemicals such as hydrogen peroxide, pyrogallol, and paraquat, but it was restored as the production of antioxidant enzymes were increased. The growth inhibition of C. albicans by reactive, oxygen-producing chemicals was reduced by treating the purified candidal SOD and catalase. Also, in the presence of SOD and catalase, the oxidative killing of C. albicans by macrophages was significantly inhibited. These results suggest that antioxidant enzymes, CuZnSOD, MnSOD, and catalase of C. albicans may play important roles in the protection of C. albicans not only from exogenous oxidative stress but also from oxidative killing by macrophages.

• 대한약침학회지
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• 제19권1호
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• pp.45-50
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• 2016

Objectives: The purpose of this study was to investigate the antifungal effect of bee venom (BV) and sweet bee venom (SBV) against Candida albicans (C. albicans) clinical isolates. Methods: In this study, BV and SBV were examined for antifungal activities against the Korean Collection for Type Cultures (KCTC) strain and 10 clinical isolates of C. albicans. The disk diffusion method was used to measure the antifungal activity and minimum inhibitory concentration (MIC) assays were performed by using a broth microdilution method. Also, a killing curve assay was conducted to investigate the kinetics of the anti-fungal action. Results: BV and SBV showed antifungal activity against 10 clinical isolates of C. albicans that were cultured from blood and the vagina by using disk diffusion method. The MIC values obtained for clinical isolates by using the broth microdilution method varied from $62.5{\mu}g/mL$ to $125{\mu}g/mL$ for BV and from $15.63{\mu}g/mL$ to $62.5{\mu}g/mL$ for SBV. In the killing-curve assay, SBV behaved as amphotericin B, which was used as positive control, did. The antifungal efficacy of SBV was much higher than that of BV. Conclusion: BV and SBV showed antifungal activity against C. albicans clinical strains that were isolated from blood and the vagina. Especially, SBV might be a candidate for a new antifungal agent against C. albicans clinical isolates.

• Archives of Pharmacal Research
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• 제29권3호
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• pp.249-255
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• 2006

Ability of iron acquisition of pathogenic microorganisms functions as a virulence factor. Candida albicans, a fungal pathogen that requires iron for growth, is susceptible to growth retardation by high-affinity iron binding proteins such as transferrin. Recently, we reported that C. albicans could utilize the heme as a part of heme-containing proteins dissociated by heme oxygenase, CaHMX1. In search of another pathway that C. albicans can use to bypass the growth regulation produced by iron limitation, this present study examined utilization of non-candidal siderophores such as Desferal and rhodotorulic acid (RA) for acquisition of inorganic iron by the fungus. C. albicans secreting no siderophores was cultured in iron-free (pretreated with apotransferrin for 24 h) (culture medium). Once growth of the yeast reached stasis from iron starvation, a siderophore was added to the culture media. Results showed that cultures containing apotransferrin within a dialysis membrane recovered growth to the level of untreated controls, whereas C. albicans yeast cells in direct contact with soluble iron-free (apo) transferrin recovered growth only partially. When static growth from iron limitation was reached, the addition of siderophore-apotransferrin complex to culture medium also permitted the yeast to recover growth from apotransferrin growth regulation. All the data show that C. albicans can utilize the non-candidal siderophores for iron acquisition under transferrin regulation as can pathogenic bacteria.

• 동의생리병리학회지
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• 제26권1호
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• pp.74-80
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• 2012

Candida albicans is a common opportunistic pathogen and is frequently associated with biofilm formation occurring on the surfaces of host tissues and medical devices. On account of the distinct resistance of C. albicans biofilms to the conventional antifungal agents, new strategies are required to cope with these infections. The root of Polygonum cuspidatum has been used for medicinal purposes in East Asia. The aim of this study was to assess the anticandidal potential of the P. cuspidatum ethanol extract by evaluating biofilm formation, integrity of the cell membranes of C. albicans and adhesion of C. albicans cells to polystyrene surfaces. The growth and development of the biofilm was assessed using an XTT reduction assay, and the extract (0.39 mg/ml) significantly reduced ($41.1{\pm}17.8%$) biofilm formation of 11 C. albicans strains. The extract damaged the cell membranes of C. albicans and remarkably inhibited cell adhesion to polystyrene surfaces. The plant extract displayed fungistatic activity without significant hemolytic activity. Based on the results of this study, the P. cuspidatum extract has promising potential for use in treating biofilm-associated Candida infection.

• Childhood Kidney Diseases
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• 제23권2호
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• pp.121-123
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• 2019

Urinary tract infection is common in the pediatric population. The most common causative agents are bacteria, among which Escherichia coli is the most frequent uropathogen. Although fungal urinary tract infection is rare in the healthy pediatric population, it is relatively common among hospitalized patients. Fungus may be isolated from the urine of immunocompromised patients or that of patients with indwelling catheters. The most common cause of funguria is Candida albicans. Although more than 50% of Candida isolates belong to non-albicans Candida, the prevalence of non-albicans candiduria is increasing. Herein, we report a case of community-acquired candiduria in a 4-month-old immunocompetent male infant who had bilateral vesicoureteral reflux and was administered antibiotic prophylaxis. He was diagnosed with urinary tract infection caused by Candida lusitaniae and was managed with fluconazole.

• 약학회지
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• 제58권5호
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• pp.343-348
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• 2014

In the present studies, we examined effect of chamomile flowers extract (CH-Ex), which has traditionally been used as antiphlogistics in Europe for many centuries, against Candida albicans-caused septic arthritis. Candida albicans is a major etiological agent among fungal septic arthritis. This effect was investigated in a murine model of the septic arthritis. That is, mice that were given an emulsion form of C. albicans cell wall (CACW) via footpad route were treated intraperitoneally with the CH-Ex for 3 times every 3 days. Degrees of the footpad-swellings were measured with dial gauger. Data showed that the CH-Ex resulted in the reduction of swelling. For instance, at Day 9 when swelling reached the highest peak, there was up to app. 60% reduction of edema in mice injected with the CH-Ex, compared to that of the control mice that received no treatment (P<0.05). This therapeutic anti-arthritic activity appeared to be mediated by inhibitions of NO (nitric oxide) production from activated RAW264.7 macrophages and proliferation of Con A-treated T lymphocytes. Analysis by HPLC revealed that the CH-Ex contained eight polyphenolic compounds including chlorogenic acid (CRA) and rutin. We have reported the CRA and rutin respectively have the anti-arthritic activity. This correlation implicates that CRA and rutin in the CH-Ex may be responsible for the activity. Combined all together, the CH-Ex has anti-arthritic activity against C. albicans-caused septic arthritis, possibly by inhibiting NO production and proliferation of T cells. This activity seems to be contributed by, at least, CRA and rutin among the compounds in the CH-Ex.