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- 저자 : Chung-YuLan (검색결과 2 건)
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Ming-Feng Lin,Ming- Li Liou,Chi-Chao Tu,Hui-Wen Yeh,Chung-YuLan 대한진단검사의학회 2013 Annals of Laboratory Medicine Vol.33 No.4
Background: The aims of this study were to understand the molecular epidemiology of integron-associated gene cassettes in Acinetobacter baumannii across four hospitals in northern Taiwan and to clarify the relationship between the presence of integrons and antibiotic-resistant phenotypes. Methods: Sixty-five A. baumannii isolates, collected from the patients of four regional hospitals in northern Taiwan in 2009, were tested for the presence of integrons and their associated gene cassettes. The susceptibility difference between integron-positive and integron-negative A. baumannii strains was analyzed. Antibiotic-resistant phenotypes among A. baumannii with different types of gene cassette array combinations were also compared. Results: Around 72% of the A. baumannii isolates carried class 1 integrase genes. Despite this, only three gene cassette arrays were found in the integrons. Integron-positive strains were significantly more resistant to all the tested antibiotics than the integrase-negative strains. All the four types of A. baumannii with different gene cassette array combinations were multidrug-resistant in nature. Gene cassette array aacA4-catB8-aadA1 existed in all the integron-positive A. baumannii isolates. Repetitive-sequence-based PCR (rep-PCR)results revealed the prevalence of one major cluster of imipenem-resistant A. baumannii strains (84%) in the four regional hospitals. Conclusions: The presence of integrons with associated antimicrobial resistance gene cassettes can be used as a representative marker of multidrug resistance in A. baumannii. Some prevalent gene cassette arrays may exist among epidemiologically unrelated A. baumannii strains.
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Responses of Candida albicans to the Human Antimicrobial Peptide LL-37
Pei-Wen Tsai,Yin-Lien Cheng,Wen-Ping Hsieh,Chung-YuLan 한국미생물학회 2014 The journal of microbiology Vol.52 No.7
Candida albicans is amajor fungal pathogen in humans. Antimicrobialpeptides (AMPs) are critical components of the innateimmune response in vertebrates and represent the firstline of defense against microbial infection. LL-37 is the onlymember of the human family of cathelicidin AMPs and iscommonly expressed by various tissues and cells, includingsurfaces of epithelia. The candidacidal effects of LL-37 havebeen well documented, but the mechanisms by which LL-37kills C. albicans are not completely understood. In this study,we examined the effects of LL-37 on cell wall and cellular responsesin C. albicans. Using transmission electron microscopy,carbohydrate analyses, and staining for β-1,3-glucan,changing of C. albicans cell wall integrity was detected uponLL-37 treatment. In addition, LL-37 also affected cell wallarchitecture of the pathogen. Finally,DNAmicroarray analysisand quantitative PCR demonstrated that sub-lethal concentrationsof LL-37 modulated the expression of genes witha variety of functions, including transporters, regulators forbiological processes, response to stress or chemical stimulus,and pathogenesis. Together, LL-37 induces complex responsesin C. albicans, making LL-37 a promising candidate for useas a therapeutic agent against fungal infections.
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