Can influenza infect macrophages?
While influenza virus infection of macrophages was once thought to be abortive, it is now clear that certain virus strains can replicate productively in macrophages. This may have important consequences for the antiviral functions of macrophages, the course of disease and the outcome of infection for the host.
What are alveolar macrophages?
Alveolar macrophages are the first line of defense against pollutants and pathogenic microbes that initiate an innate immune response in the lung. Two phenotypes of alveolar macrophages have been identified: classically activated macrophage (M1 macrophage) and alternatively activated macrophage (M2 macrophage).
What do alveolar macrophages produce?
To prevent uncontrolled inflammation in the lower respiratory tract, alveolar macrophages secrete nitric oxide, prostaglandins, interleukin-4 and -10(IL-4, IL-10), and transforming growth factor-β (TGF-β).
Are type 2 alveolar cells macrophages?
Alveolar Epithelial Type II Cells Activate Alveolar Macrophages and Mitigate P. Aeruginosa Infection – PMC. The .
Do viruses infect macrophages?
The ability to infect and replicate in macrophages is implicated in the pathogenesis of many viruses, such as influenza virus [1], rabies virus [2], and dengue virus [3]. This review analyzes four viruses in which well-defined mutations have been identified that confer the ability to infect macrophages.
How do macrophages detect viruses?
Macrophages and other host cells respond to viral infection by modulating their protein expression levels, proteins’ posttranslational modifications, as well as proteins’ intracellular localization and secretion.
What are the two types of alveolar cells?
The alveolar epithelium comprises two main cell types: the alveolar type I and alveolar type II cell. The type I cell is a complex branched cell with multiple cytoplasmic plates that are greatly attenuated and relatively devoid of organelles; these plates represent the gas exchange surface in the alveolus.
How are alveolar macrophages activated?
Activation typically occurs through engagement of macrophage pattern recognition receptors (PRRs) and can be titrated by competitive interactions with soluble PRRs within the alveolar milieu. One example of this is the interaction between SP-A and the CD14 ligand LBP.
What is the difference between Type 1 and Type 2 alveolar cells?
Type 1 pneumocytes are thin flattened cells that are responsible for the gas exchange between alveoli and capillaries. Type 2 pneumocytes are smaller cells that are cuboidal in shape. They are responsible for the secretion of pulmonary surfactants in order to reduce the surface tension in the alveoli.
What is Type 1 alveolar cell?
Type I pneumocytes cover 95% of the internal surface of each alveolus. These cells are thin and squamous, ideal for gas exchange. They share a basement membrane with pulmonary capillary endothelium, forming the air-blood barrier where gas exchange occurs.
What do macrophages do to viruses?
Still too small to see with your eyes, but big enough to do the important job of cleaning up unwanted viruses, bacteria, and parts of dead cells. Macrophages don’t eat cells the same way you might eat your food. Instead, the eating machines engulf viruses and bacteria. This is called phagocytosis.