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Assessing Anti-fungal Activity of Isolated Alveolar Macrophages by Confocal Microscopy
Published on: July 9, 2014
An Adenoviral Vector Encoding Full-Length Dectin-1 Promotes Aspergillus-Induced Innate Immune Response in Macrophages
Di Xia1, Wen-Kui Sun, Ming-Ming Tan
1Department of Respiratory and Critical Care Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China.
Introduction:
The incidence of invasive pulmonary aspergillosis (IPA) has increased significantly over the last two decades. Alveolar macrophages (AMs) represent the first line of pulmonary host response to Aspergillus conidia. Recognition of conidia by AMs involves Dectin-1 (CLEC7A), which is a conserved structure to combine β-glucans. The deficiency of Dectin-1 results in impaired fungal killing and uncontrolled growth of Aspergillus fumigatus. Thus, we hypothesized that high expression of Dectin-1 would enhance the host recognition and fungal killing.
Methods:
We set out to develop an adenoviral vector encoding full-length Dectin-1 (Ad-Dectin-1-EGFP) and then transfect it to MH-S cells. Transfect cell model was verified by using real-time RT-PCR, Western blot, flow cytometric, and confocal microscopic assays. And also, the function of Dectin-1 was explored by measuring cytokine release and killing ability during the course of A. fumigatus infection.
Results:
We constructed a recombinant adenovirus which could upregulate the expression of Dectin-1 and verified that Dectin-1 was expressed on cell membrane. The function of Dectin-1 was also demonstrated by its ability in promoting the production of cytokines and increasing the killing ability during the course of A. fumigatus infection.
Conclusions:
An adenoviral vector was successfully applied to the production of a recombinant adenovirus encoding full-length Dectin-1, and also, its function in Aspergillus-induced innate immune response was demonstrated.
Insights
Increasing Dectin-1 expression via adenovirus enhances alveolar macrophage response to Aspergillus fumigatus. This boosts fungal recognition and killing, crucial for combating invasive pulmonary aspergillosis.
Area of Science:
- Immunology
- Infectious Diseases
- Biotechnology
Background:
- Invasive pulmonary aspergillosis (IPA) incidence is rising.
- Alveolar macrophages (AMs) are key in responding to Aspergillus conidia.
- Dectin-1 (CLEC7A) on AMs recognizes fungal beta-glucans, but its deficiency impairs Aspergillus fumigatus clearance.
Purpose of the Study:
- To develop an adenoviral vector for enhanced Dectin-1 expression in AMs.
- To investigate the functional impact of increased Dectin-1 on Aspergillus fumigatus recognition and killing.
Main Methods:
- Constructed a recombinant adenovirus encoding full-length Dectin-1 (Ad-Dectin-1-EGFP).
- Transfected MH-S cells and verified Dectin-1 expression using RT-PCR, Western blot, flow cytometry, and confocal microscopy.
- Assessed Dectin-1 function by measuring cytokine release and fungal killing during Aspergillus fumigatus infection.
Main Results:
- Successfully created an adenovirus that upregulates Dectin-1 expression on the cell membrane.
- Demonstrated that enhanced Dectin-1 promotes cytokine production.
- Showed increased killing ability against Aspergillus fumigatus in infected cells.
Conclusions:
- An adenoviral vector effectively produced recombinant Dectin-1.
- The study confirmed Dectin-1's crucial role in Aspergillus-induced innate immune responses.
- Upregulating Dectin-1 shows potential for improving host defense against fungal infections.
