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Live Imaging of Antifungal Activity by Human Primary Neutrophils and Monocytes in Response to A. fumigatus
Published on: April 19, 2017
Aspergillus fumigatus cytochrome c impacts conidial survival during sterilizing immunity
Matthew R James1, Mariano A Aufiero2, Elisa M Vesely1
1Department of Microbiology and Immunology, Geisel School of Medicine, Dartmouth, Hanover, New Hampshire, USA.
Importance:
Aspergillus fumigatus can cause a life-threatening infection known as invasive pulmonary aspergillosis (IPA), which is marked by fungus-attributable mortality rates of 20%-30%. Individuals at risk for IPA harbor genetic mutations or incur pharmacologic defects that impair myeloid cell numbers and/or function, exemplified by bone marrow transplant recipients, patients that receive corticosteroid therapy, or patients with chronic granulomatous disease (CGD). However, treatments for Aspergillus infections remain limited, and resistance to the few existing drug classes is emerging. Recently, the World Health Organization classified A. fumigatus as a critical priority fungal pathogen. Our cell death research identifies an important aspect of fungal biology that impacts susceptibility to leukocyte killing. Furthering our understanding of mechanisms that mediate the outcome of fungal-leukocyte interactions will increase our understanding of both the underlying fungal biology governing cell death and innate immune evasion strategies utilized during mammalian infection pathogenesis. Consequently, our studies are a critical step toward leveraging these mechanisms for novel therapeutic advances.
Insights
This study reveals how Aspergillus fumigatus cell death impacts its susceptibility to immune cells. Understanding these fungal-leukocyte interactions is key to developing new treatments for invasive pulmonary aspergillosis (IPA).
Area of Science:
- Mycology and Immunology
- Infectious Diseases
- Cell Biology
Background:
- Invasive pulmonary aspergillosis (IPA), caused by Aspergillus fumigatus, has high mortality rates (20-30%).
- At-risk individuals often have impaired myeloid cell function due to genetic or pharmacologic factors (e.g., bone marrow transplant recipients, corticosteroid users, CGD patients).
- Limited treatment options and emerging drug resistance make A. fumigatus a critical global health concern.
Purpose of the Study:
- To investigate the role of fungal cell death mechanisms in susceptibility to host immune cell killing.
- To elucidate fungal biology and innate immune evasion strategies employed during mammalian infection.
- To identify novel therapeutic targets for Aspergillus infections.
Main Methods:
- Research focused on cell death pathways in Aspergillus fumigatus.
- Analysis of fungal-leukocyte interactions.
- Investigation of immune evasion mechanisms utilized by the fungus.
Main Results:
- Identified a critical aspect of fungal cell death influencing susceptibility to leukocyte-mediated killing.
- Provided insights into the mechanisms governing the outcome of Aspergillus-leukocyte interactions.
- Characterized fungal strategies for evading the innate immune system.
Conclusions:
- Understanding fungal cell death and immune evasion is crucial for combating IPA.
- These findings represent a significant step towards developing novel therapeutic strategies.
- Further research into fungal-leukocyte interactions can lead to improved treatments for life-threatening Aspergillus infections.
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