Antifungal Susceptibility, Enzymatic Activity, PCR-Fingerprinting and ITS Sequencing of Environmental Cryptococcus laurentii Isolates from Uberaba, Minas Gerais, Brazil
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  • 作者：Kennio Ferreira-Paim (1) kennio_p@hotmail.com
    Leonardo Andrade-Silva (1)
    Delio Jose Mora (1)
    Eliane Lages-Silva (1)
    André Luiz Pedrosa (2)
    Paulo Roberto da Silva (3)
    Anderson Assun??o Andrade (3)
    Mario León Silva-Vergara (1) marioleon.dip@mednet.com.br
  • 关键词：Cryptococcus laurentii – Phospholipase activity – Antifungal susceptibility – M13 fingerprinting – (GACA)4 fingerprinting – Internal transcribed spacer
  • 刊名：Mycopathologia
  • 出版年：2012
  • 出版时间：July 2012
  • 年：2012
  • 卷：174
  • 期：1
  • 页码：41-52
  • 全文大小：481.3 KB
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  • 作者单位：1. Department of Infectious and Parasitic Diseases, Triangulo Mineiro Federal University, Postal Code 118, Uberaba, MG 38001-170, Brazil2. Department of Molecular Biology, Triangulo Mineiro Federal University, Uberaba, MG, Brazil3. Department of Microbiology, Triangulo Mineiro Federal University, Uberaba, MG, Brazil
  • 刊物类别：Biomedical and Life Sciences
  • 刊物主题：Life Sciences
    Microbiology
    Medical Microbiology
    Plant Sciences
    Microbial Ecology
  • 出版者：Springer Netherlands
  • ISSN：1573-0832
文摘
Cryptococcus laurentii has been classically considered a saprophytic species, although several cases of human infection have been already reported. This study aimed to evaluate the phospholipase, proteinase and hemolysins activity, the antifungal susceptibility profile, the genetic variability by M13 and (GACA)4 fingerprinting and the internal transcribe spacer (ITS) sequencing of 38 C. laurentii isolates recovered from captive bird droppings and surrounding hospital areas. All of them exhibited phospholipase activity, while the hemolytic activity was evidenced in 34 (89.4%) isolates. None of them exhibited proteinase activity. Twenty-seven isolates (71.1%) presented susceptibility dose dependent to fluconazole. Most isolates (94.7%) were susceptible to voriconazole, while one (2.65%) was resistant to this drug. Twenty-one (55.3%) isolates showed reduced susceptibility to itraconazole while nine (23.7%) were resistant. Three (7.9%) and five (13.1%) isolates exhibited resistance to ketoconazole and amphotericin B, respectively. Most C. laurentii fingerprinting obtained with M13 and (GACA)4 showed high heterogeneity. By using the two primers, seven (18.4%) isolates grouped as A (CL2, CL7, and CL8), B (CL35, CL38) and C (CL29, CL30) with 100% similarity. Different from most variable surrounding hospital isolates, all but one of the pet shops strains clustered with the two primers, although they had been recovered from different neighborhoods. All isolates were identified as C. laurentii phylogenetic group I by ITS sequencing. Thus, the presence of virulence factors, a decreased antifungal susceptibility and a heterogeneous molecular pattern of the C. laurentii isolates here described suggests this species can be a potential pathogen in the context of the immunocompromised population.

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