What is the mechanism of action of pertussis whooping cough?
What is the mechanism of action of pertussis whooping cough?
The toxin kills ciliated cells and causes their extrusion from the mucosa. It also stimulates release of cytokine IL-1, and so causes fever. It produces the pertussis toxin, PTx, a protein that mediates both the colonization and toxemic stages of the disease.
What toxin is responsible for whooping cough?
Pertussis toxin (PT) is a protein-based AB5-type exotoxin produced by the bacterium Bordetella pertussis, which causes whooping cough. PT is involved in the colonization of the respiratory tract and the establishment of infection.
How does pertussis toxin affect G protein Signalling?
Pertussis toxin is isolated from the bacteria Bordetella pertussis. It is shown to modify the function of G proteins by catalyzing the ADP-ribosylation of a cysteine residue on the carboxy terminal of α subunit of Gi and Go. Gia is more sensitive to the actions of pertussis toxin than Goa.
How does adenylate cyclase toxin work?
The adenylate cyclase toxin (CyaA) of Bordetella pertussis is a major virulence factor required for the early phases of lung colonization. It can invade eukaryotic cells where, upon activation by endogenous calmodulin, it catalyzes the formation of unregulated cAMP levels.
How does Bordetella pertussis affect respiratory cilia?
pertussis have been demonstrated to suppress the normal responses of the host to pertussis in vitro and in vivo. TCT, by destruction of ciliated epithelial cells, impedes clearance of bacteria, mucus and debris from airways.
What is the causative agent of pertussis?
Pertussis, a respiratory illness commonly known as whooping cough, is a very contagious disease caused by a type of bacteria called Bordetella pertussis. These bacteria attach to the cilia (tiny, hair-like extensions) that line part of the upper respiratory system.
What is the pathogen that causes pertussis?
Pertussis, a respiratory illness commonly known as whooping cough, is a very contagious disease caused by a type of bacteria called Bordetella pertussis.
What is the mechanism of the pertussis toxin explaining its effect on the GI protein?
Pertussis toxin (PT) utilizes a retrograde transport pathway through the Golgi complex and endoplasmic reticulum (ER) to gain entry to the cell cytosol. ATP binding to PT B oligomer (PTB) in the ER promotes holotoxin dissociation for further transport of the active subunit.
What does pertussis toxin do in EAE?
Pertussis toxin (PT) has been widely used to facilitate the induction of experimental autoimmune encephalomyelitis (EAE) in rodents. It has been suggested that this microbial product promotes EAE by opening up the blood-brain barrier and thereby facilitates the migration of pathogenic T cells to the CNS.
How does Bordetella pertussis cause whooping cough?
What causes whooping cough? A bacterium known as Bordetella pertussis causes whooping cough infection. The bacteria attach to the lining of the airways in the upper respiratory system and release toxins that lead to inflammation and swelling.
