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Conversion of <em>Salmonella typhimurium</em> to L-forms contributes to the maintenance of acquired immunity against murine typhoid.
- Source :
- Immunology; Oct95, Vol. 86 Issue 2, p206-211, 6p
- Publication Year :
- 1995
-
Abstract
- Conversion of Salmonella typhimurium to L-forms, both in vitro and in vivo, resulted in the expression of proteins cross-reacting to the mycobacterial 65000 MW heat-shock protein (hsp). Immunization of C3H/HeJ mice with a protective dose of stable L-form S. typhimurium induced γδ T cells in the liver, in accordance with the multiplication of L-form Salmonella in Kupffer cells. The number of γδ T cells decreased after the intracellular growth of L-form Salmonella plateaued. Persistance of the L-forms in Kupffer cells, however, allowed hepatic γδ T cells to increase within 48 hr of infection with virulent S. typhimurium. Thus, the intrahepatic colonization of L-form Salmonella seems to keep γδ T cells on standby, but the emergence of these T cells does not correlate with the expression of L-form hsp. In addition, Kupffer cells colonized by L-forms constitutively synthesized mRNA for interleukin-6 (IL-6) and tumour necrosis factor-α (TNF-α). These results suggest that conversion of S. typhimurium to L-forms in phagocytic cells builds up and maintains acquired resistance, conferred by live-cell vaccines of S. typhimurium, against murine typhoid. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00192805
- Volume :
- 86
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Immunology
- Publication Type :
- Academic Journal
- Accession number :
- 14075450