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Published on: December 13, 2024
Respiratory Epithelial Cells: More Than Just a Physical Barrier to Fungal Infections
Bianca C S C Barros1, Bruna R Almeida2, Debora T L Barros2
1Laboratory of Applied Toxinology, Center of Toxins, Immune-Response and Cell Signaling (CeTICS), Butantan Institute, São Paulo 05503-900, SP, Brazil.
Abstract:
The respiratory epithelium is highly complex, and its composition varies along the conducting airways and alveoli. In addition to their primary function in maintaining the respiratory barrier and lung homeostasis for gas exchange, epithelial cells interact with inhaled pathogens, which can manipulate cell signaling pathways, promoting adhesion to these cells or hosting tissue invasion. Moreover, pathogens (or their products) can induce the secretion of chemokines and cytokines by epithelial cells, and in this way, these host cells communicate with the immune system, modulating host defenses and inflammatory outcomes. This review will focus on the response of respiratory epithelial cells to two human fungal pathogens that cause systemic mycoses: Aspergillus and Paracoccidioides. Some of the host epithelial cell receptors and signaling pathways, in addition to fungal adhesins or other molecules that are responsible for fungal adhesion, invasion, or induction of cytokine secretion will be addressed in this review.
Insights
Respiratory epithelial cells interact with fungal pathogens like Aspergillus and Paracoccidioides. This review explores how these cells respond to fungal adhesion, invasion, and immune signaling.
Area of Science:
- Immunology
- Cell Biology
- Microbiology
Background:
- The respiratory epithelium forms a critical barrier against inhaled pathogens.
- Epithelial cells play a key role in lung homeostasis and gas exchange.
- Pathogens can manipulate epithelial cell signaling, promoting adhesion and invasion.
Purpose of the Study:
- To review the response of respiratory epithelial cells to fungal pathogens.
- To focus on Aspergillus and Paracoccidioides, which cause systemic mycoses.
- To discuss host-pathogen interactions at the cellular level.
Main Methods:
- Literature review of host-pathogen interactions.
- Analysis of cell signaling pathways involved in fungal infections.
- Identification of fungal molecules mediating adhesion and invasion.
Main Results:
- Fungal pathogens manipulate respiratory epithelial cell signaling pathways.
- Epithelial cells secrete chemokines and cytokines in response to fungal presence.
- Specific host receptors and fungal adhesins are involved in these interactions.
Conclusions:
- Respiratory epithelial cells are active participants in antifungal immunity.
- Understanding these interactions is crucial for developing treatments for systemic mycoses.
- This review highlights key molecular mechanisms in host-pathogen communication.
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