modulatory effects of salmonella lap-lps on murine macrophages
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ID: 196854
2002
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Abstract
PURPOSE: To study the modulatory effects of Salmonella lipid associated protein - lipopolysaccharides (LAP-LPS) on murine macrophages as the intracellular survival within the host macrophages is an important feature for a number of gram-negative pathogens like S.typhi. METHODS: Macrophage functions were studied in two groups of mice immunized with either LPS or LAP-LPS. RESULTS: Comparison of protective efficacy of mice preimmunized with LPS based preparations, against challenge infectious doses, showed higher protection in LAP-LPS complex immunized mice group as compared to the mice group immunized with LPS alone. Aggregation of S.typhi cells was lesser with intestinal mucus extracted from LAP-LPS immunized mice as compared to LPS immunized challenged group. A significant increase in the number of macrophages in LAP-LPS immunized mice was also observed in comparison to control and LPS immunized mice groups. Nitric oxide (NO) and superoxide dismutase (SOD) production were also more in macrophages derived from LAP-LPS immunized mice group. Phagocytic uptake studies showed that there was enhanced uptake of bacteria in the LAP-LPS immunized animals in comparison to LPS immunized and controls. Similar trend was observed in intracellular killing of bacteria by the macrophages. CONCLUSIONS: The results indicated the involvement of protein moiety in LAP on modulation of effects of LPS on macrophages.
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| Authors | ;Rishi P;Batra N;Sood S;Tiwari R |
| Journal | bjog : an international journal of obstetrics and gynaecology |
| Year | 2002 |
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