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. 1996 Oct;64(10):3983–3986. doi: 10.1128/iai.64.10.3983-3986.1996

Expression of the inlAB operon by Listeria monocytogenes is not required for entry into hepatic cells in vivo.

S H Gregory 1, A J Sagnimeni 1, E J Wing 1
PMCID: PMC174326  PMID: 8926058

Abstract

Listeria monocytogenes injected intravenously into mice is taken up in the liver, where hepatocytes serve as the principal site of intracellular replication. The factors effecting entry of L. monocytogenes into hepatic cells remain to be determined. Others have shown that the protein products of the inlAB (internalin) operon are required for maximum entry of L. monocytogenes into a number of cell lines in vitro. Likewise, we report here that expression of the inlAB operon was required for maximum uptake of L. monocytogenes by primary cultures of mouse hepatocytes. Uptake of an inlAB mutant strain of L. monocytogenes was approximately 10-fold less than that of the isogenic wild-type control. In contrast, inlAB expression was not a factor in (i) clearance of L. monocytogenes injected intravenously into mice and taken up in the liver, (ii) the distribution of L. monocytogenes among hepatocytes and nonparenchymal cells in the liver, or (iii) internalization of L. monocytogenes by hepatic cells in vivo. These latter findings suggest that infection of hepatic cells by L. monocytogenes in vivo does not require the protein products of the inlAB operon.

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Selected References

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