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The role of intravesical polymorphonuclear leukocytes in experimental cystitis
Abstract:
Electron and light microscopic observations were made on experimentally induced cystitis in rats with particular emphasis on the role of polymorphs in the wall of the urinary bladder. Polymorphs appear from the time of invasion of bacteria to the epithelial cells of the bladder, aggregate primarily around infected epithelial cells, which become surrounded and isolated from healthy epithelial cells, and accelerate the desquamation of the infected epithelial cells. In the submucosal layer, all invading bacteria are phagocytized by polymorphs. Although polymorphs found in the intercellular space of the epithelial cells do not show phagocytosis, those that are released into the lumen of the urinary bladder do.
Insights
Polymorphonuclear leukocytes play a crucial role in combating bacterial cystitis by phagocytizing bacteria and promoting the shedding of infected bladder epithelial cells. These immune cells are essential for clearing infections within the urinary bladder wall.
Area of Science:
- Urology
- Immunology
- Pathology
Background:
- Bacterial cystitis is a common urinary tract infection.
- The role of polymorphonuclear leukocytes (polymorphs) in the bladder wall during infection is not fully understood.
Purpose of the Study:
- To investigate the role of polymorphs in experimentally induced cystitis in rats.
- To elucidate the interactions between polymorphs, bacteria, and bladder epithelial cells.
Main Methods:
- Electron microscopy
- Light microscopy
- Experimental induction of cystitis in rats
Main Results:
- Polymorphs appear early during bacterial invasion of bladder epithelium.
- Polymorphs aggregate around infected epithelial cells, isolating them and accelerating their shedding (desquamation).
- In the submucosa, polymorphs effectively phagocytize invading bacteria; however, polymorphs within intercellular spaces do not phagocytize, while those in the lumen do.
Conclusions:
- Polymorphonuclear leukocytes are critical in the host defense against bacterial cystitis.
- Polymorphs contribute to pathogen clearance through phagocytosis and removal of infected epithelial cells.