In vitro expression of vital virulent genes of clinical and environmental isolates of Cryptococcus neoformans/gattii in endothelial cells of human blood-brain barrier
Abstract
Background Evaluation of the pathogenesis of clinical and environmental cryptococcal isolates to the central nervous system is necessary for understanding the risk. This study was designed to determine the in vitro expression of six important virulent genes of Cryptococcus neoformans/gattii in Human Brain Microvascular Endothelial cells (hBMEC).Methods The hBMEC were infected with Cryptococcus to determine invasion and survival rate at 3, 12 and 24hours by subsequent colony count of internalized yeasts. The whole RNA of the intracellular Cryptococcus was extracted to quantify the expression of CAP10, PLB1, ENA1, URE1, LAC1, and MATα genes by real-time quantitative PCR for 3 and 12hours of infection.Results Invasion and survival rates were higher in clinical and standard strains of C. neoformans. A significant difference was observed among the clinical and environmental isolates for the expression of CAP10, ENA1, LAC1, MATα and URE1 at 3hours, and ENA1, LAC1, MATα, PLB1 and URE1 at 12hours. Clinical isolates showed significant upregulation of all the genes except PLB1, which was higher in environmental isolates. Relative expressions at the two time-points showed statistically significant (P=0.043) changes for the clinical isolates and no significance (P=0.063) for environmental isolates.Conclusion The C. gattii (VGI) isolates showed significantly lower invasion and survival than C. neoformans (VNI, and VNII) irrespective of their sources. Clinical isolates exhibited higher expression for the majority of the virulent genes until 12hours of infection, probably due to their better adaptation in the host system and enhanced pathogenicity than the environmental counterparts.
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Melanin is produced by laccases, which are upregulated in C. neoformans clinical and environmental isolates.
“Melanin is produced by laccases, which are upregulated in C. neoformans clinical and environmental isolates66”
From Treatment strategies for cryptococcal infection: challenges, advances and future outlook (2021) · cites this paper as [66]
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Treatment strategies for cryptococcal infection: challenges, advances and future outlook
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- Authors
- Lahiri, S., Banerjee, A., Bhutda, S., Palaniappan, M., Bahubali, V. H., Manjunath, N., Maji, S., & Siddaiah, N.
- Affiliations
- National Institute of Mental Health and Neurosciences (IN)
- Indian Institute of Technology Bombay (IN)
- Corresponding author
- Siddaiah, N.
- Venue
- Journal de Mycologie Médicale
- Publisher
- Elsevier BV
- Published
- 2019-09
- Volume
- 29
- Issue
- 3
- Pages
- 239-244
- ISSN
- 1156-5233 (ISSN-L)
- OpenAlex
- W2949427287
- Cited by
- 4
- References
- 22
- Citations by year
- 2026: 1 · 2024: 1 · 2021: 2
- FWCI
- 0.38
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal de Mycologie Médicale (publishedVersion)
- PubMed (publishedVersion)
- DSpace (IIT Bombay) (submittedVersion)
- Funders
- University Grants Commission (2121130717, 18-12/2011)
- Topics
- Health Sciences › Medicine › Epidemiology › Fungal Infections and Studies
- Life Sciences › Immunology and Microbiology › Microbiology › Bacterial Infections and Vaccines
- Life Sciences › Immunology and Microbiology › Parasitology › Parasitic Infections and Diagnostics
- Keywords
- Cryptococcus neoformans, Cryptococcus gattii, virulence genes, gene expression, human brain microvascular endothelial cells, blood-brain barrier, clinical isolates, environmental isolates, PLB1, ENA1, cryptococcal meningitis, pathogenesis
- MeSH terms
- Host Microbial Interactions, Blood-Brain Barrier, Cell Line, Cryptococcosis, Cryptococcus neoformans, Environmental Microbiology, Fungal Proteins, Genotype, Humans, Gene Expression, Virulence Factors, Endothelial Cells, Cryptococcus gattii
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