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Updated: Aug 7, 2026

Histological Quantification to Determine Lung Fungal Burden in Experimental Aspergillosis
Published on: March 9, 2018
[Putative virulence factors of Aspergillus species]
1Hacettepe Universitesi Tip Fakültesi, Mikrobiyoloji ve Klinik Mikrobiyoloji Anabilim Dali, Ankara.
Abstract:
Members of the genus Aspergillus are filamentous, ubiquitous fungi found in nature. Aspergillus species can cause clinical settings in man, such as opportunistic infections, allergic states and toxicoses. Immunosuppression is the major factor predisposing to development of opportunistic mycoses. To invade the host, Aspergillus species must be able to adhere to and penetrate the host tissues. Much work has focused on the search for virulence determinants that allow the establishment of the fungus within the host. Adhesins, pigment production, toxic metabolites and extracellular enzymes are thought to be the putative virulence factors of Aspergillus species. Adhesion systems provide binding of conidia to various circulating or basement membrane-associated host proteins; toxic molecules inhibit macrophage phagocytosis and mucociliary action; pigment production aids in longer survival in tissues and also overwhelms the host defence systems; extracellular enzymes degrade the structural barriers in the host. In this review, putative virulence factors of Aspergillus species and their potential role in aspergillosis have been discussed.
Insights
Aspergillus fungi cause opportunistic infections in humans, especially those who are immunosuppressed. This review discusses key virulence factors like adhesins and toxins that help Aspergillus invade host tissues.
Area of Science:
- Mycology
- Infectious Diseases
- Immunology
Context:
- Aspergillus species are ubiquitous filamentous fungi.
- They cause opportunistic infections, allergic conditions, and toxicoses in humans.
- Immunosuppression is a primary risk factor for invasive aspergillosis.
Purpose:
- To review the putative virulence factors of Aspergillus species.
- To discuss their potential roles in the pathogenesis of aspergillosis.
Summary:
- Aspergillus invades host tissues by adhering to and penetrating host cells.
- Putative virulence factors include adhesins, pigment production, toxic metabolites, and extracellular enzymes.
- These factors facilitate fungal survival, immune evasion, and tissue damage.
Impact:
- Understanding these virulence factors is crucial for developing targeted therapies against aspergillosis.
- This knowledge can aid in preventing and managing invasive fungal infections.
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