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Ultrastructural studies on the effect of Triton WR-1339 on macrophage-mycobacteria interaction
Abstract:
Mycobacterium bovis (BCG organisms) suspended in saline or a 5% solution of a non-ionic detergent, Triton WR-1339, was injected intraperitoneally into mice. Electron-microscopic observation was carried out on peritoneal exudate cells harvested therefrom. Electron-lucent vacuoles limited by the membrane structure were found in macrophages of the mice injected with BCG suspended in the detergent, but not in polymorphonuclear leukocytes or lymphocytes. Mycobacterial cells were present within such vacuoles. Without the detergent, the ingested mycobacterial cells were in close contact with the phagosomal membrane. Within the electron-lucent vacuoles, however, such close contact was not present. These observations, together with other collateral findings, led us to a view that Triton WR-1339 may inhibit the interaction between mycobacteria and the phagosomal membrane by intervening between them thus making the progress of infection delayed.
Insights
Triton WR-1339 detergent alters how macrophages interact with Mycobacterium bovis (BCG). This may inhibit infection by preventing mycobacteria from binding to phagosomal membranes.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Mycobacterium bovis, bacille Calmette-Guérin (BCG), is an important pathogen.
- Understanding host-pathogen interactions at the cellular level is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the effect of Triton WR-1339 on the interaction between BCG and mouse peritoneal cells.
- To elucidate the role of the phagosomal membrane in BCG uptake and intracellular survival.
Main Methods:
- BCG organisms were suspended in saline or 5% Triton WR-1339 solution.
- Mice were injected intraperitoneally with the BCG suspensions.
- Peritoneal exudate cells were harvested and examined using electron microscopy.
Main Results:
- Electron-lucent vacuoles containing BCG were observed in macrophages from mice treated with BCG in Triton WR-1339.
- BCG within these vacuoles showed reduced contact with the phagosomal membrane compared to BCG in saline.
- No such vacuoles were observed in polymorphonuclear leukocytes or lymphocytes.
Conclusions:
- Triton WR-1339 appears to inhibit the interaction between BCG and the phagosomal membrane.
- This inhibition may occur by the detergent intervening between the mycobacteria and the membrane.
- The findings suggest a potential mechanism for delaying BCG infection progression.