Virulence Factors and Azole-Resistant Mechanism of Candida Tropicalis Isolated from Candidemia.
Azole resistance
Biofilm
Candida tropicalis
Candidemia
Virulence factors
Journal
Mycopathologia
ISSN: 1573-0832
Titre abrégé: Mycopathologia
Pays: Netherlands
ID NLM: 7505689
Informations de publication
Date de publication:
Dec 2021
Dec 2021
Historique:
received:
26
03
2021
accepted:
14
07
2021
pubmed:
20
8
2021
medline:
23
11
2021
entrez:
19
8
2021
Statut:
ppublish
Résumé
Limited knowledge exists on the virulence factors of Candida tropicalis and the mechanisms of azole resistance that lead to an intensified pathogenicity and treatment failure. We aimed to evaluate the virulence factors and molecular mechanisms of azole resistance among C. tropicalis isolated from patients with candidemia. Several virulence factors, including extracellular enzymatic activities, cell surface hydrophobicity (CSH), and biofilm formation, were evaluated. Antifungal susceptibility pattern and expression level of ERG11, UPC2, MDR1, and CDR1 genes of eight (4 fluconazole resistance and 4 fluconazole susceptible) clinical C. tropicalis isolates were assessed. The correlation between the virulence factors and antifungal susceptibility patterns was analyzed. During a 4 year study, forty-five C. tropicalis isolates were recovered from candidemia patients. The isolates expressed different frequencies of virulence determinants as follows: coagulase 4 (8.9%), phospholipase 5 (11.1%), proteinase 31 (68.9%), esterase 43 (95.6%), hemolysin 44 (97.8%), biofilm formation 45 (100%) and CSH 45(100%). All the isolates were susceptible to amphotericin B and showed the highest resistance to voriconazole. There was a significant positive correlation between micafungin minimum inhibitory concentrations (MICs) and hemolysin production (r C. tropicalis isolated from candidemia patients extensively displayed capacities for biofilm formation, hemolysis, esterase activity, and hydrophobicity. In addition, the overexpression of ERG11 and UPC2 genes was considered one of the possible mechanisms of azole resistance.
Sections du résumé
BACKGROUND
BACKGROUND
Limited knowledge exists on the virulence factors of Candida tropicalis and the mechanisms of azole resistance that lead to an intensified pathogenicity and treatment failure. We aimed to evaluate the virulence factors and molecular mechanisms of azole resistance among C. tropicalis isolated from patients with candidemia.
MATERIALS AND METHODS
METHODS
Several virulence factors, including extracellular enzymatic activities, cell surface hydrophobicity (CSH), and biofilm formation, were evaluated. Antifungal susceptibility pattern and expression level of ERG11, UPC2, MDR1, and CDR1 genes of eight (4 fluconazole resistance and 4 fluconazole susceptible) clinical C. tropicalis isolates were assessed. The correlation between the virulence factors and antifungal susceptibility patterns was analyzed.
RESULTS
RESULTS
During a 4 year study, forty-five C. tropicalis isolates were recovered from candidemia patients. The isolates expressed different frequencies of virulence determinants as follows: coagulase 4 (8.9%), phospholipase 5 (11.1%), proteinase 31 (68.9%), esterase 43 (95.6%), hemolysin 44 (97.8%), biofilm formation 45 (100%) and CSH 45(100%). All the isolates were susceptible to amphotericin B and showed the highest resistance to voriconazole. There was a significant positive correlation between micafungin minimum inhibitory concentrations (MICs) and hemolysin production (r
CONCLUSION
CONCLUSIONS
C. tropicalis isolated from candidemia patients extensively displayed capacities for biofilm formation, hemolysis, esterase activity, and hydrophobicity. In addition, the overexpression of ERG11 and UPC2 genes was considered one of the possible mechanisms of azole resistance.
Identifiants
pubmed: 34410566
doi: 10.1007/s11046-021-00580-y
pii: 10.1007/s11046-021-00580-y
doi:
Substances chimiques
Antifungal Agents
0
Azoles
0
Virulence Factors
0
Fluconazole
8VZV102JFY
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
847-856Subventions
Organisme : tehran university of medical sciences and health services
ID : 1400-1-99-53171
Informations de copyright
© 2021. The Author(s), under exclusive licence to Springer Nature B.V.
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