PMID- 11160006 OWN - NLM STAT- MEDLINE DCOM- 20010315 LR - 20231213 IS - 0019-9567 (Print) IS - 1098-5522 (Electronic) IS - 0019-9567 (Linking) VI - 69 IP - 2 DP - 2001 Feb TI - Neural route of cerebral Listeria monocytogenes murine infection: role of immune response mechanisms in controlling bacterial neuroinvasion. PG - 1093-100 AB - The pathologic features of cerebral Listeria monocytogenes infection strongly suggest that besides hematogenous spread, bacteria might also spread via a neural route. We propose that after snout infection of recombination activating gene 1 (RAG-1)-deficient mice, L. monocytogenes spreads to the brain via a neural route. The neural route of invasion is suggested by (i) the immunostaining of L. monocytogenes in the trigeminal ganglia (TG) and brain stem but not in other areas of the brain; (ii) the kinetics of bacterial loads in snout, TG, and brain; and (iii) the increased resistance of mice infected with a plcB bacterial mutant (unable to spread from cell to cell). Gamma interferon (IFN-gamma) plays a protective role in neuroinvasion; inducible nitric oxide synthase (iNOS) accounts only partially for the protection, as shown by a comparison of the susceptibilities of IFN-gamma receptor (IFN-gamma R)-deficient, iNOS-deficient, and wild-type mice to snout infection with L. monocytogenes. The dramatically enhanced susceptibility of RAG-1-deficient, IFN-gamma R gene-deficient mice indicated the overall importance of innate immune cells in the release of protective levels of IFN-gamma. The source of IFN-gamma appeared to be NK cells, as shown by use of RAG-1-deficient, gamma-chain receptor gene-deficient mice; NK cells played a relevant protective role in neuroinvasion through a perforin-independent mechanism. In vitro evidence indicated that IFN-gamma can directly induce bacteriostatic mechanisms in neural tissue. FAU - Jin, Y AU - Jin Y AD - Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden. Martin.Rottenberg@mtc.ki.se FAU - Dons, L AU - Dons L FAU - Kristensson, K AU - Kristensson K FAU - Rottenberg, M E AU - Rottenberg ME LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Infect Immun JT - Infection and immunity JID - 0246127 RN - 0 (Receptors, Interferon) RN - 82115-62-6 (Interferon-gamma) RN - EC 1.14.13.39 (Nitric Oxide Synthase) RN - EC 1.14.13.39 (Nitric Oxide Synthase Type II) RN - EC 1.14.13.39 (Nos2 protein, mouse) RN - EC 3.1.- (Phospholipases) SB - IM MH - Animals MH - Brain/*microbiology MH - Cytotoxicity, Immunologic MH - Interferon-gamma/physiology MH - Killer Cells, Natural/immunology MH - Listeria monocytogenes/*immunology MH - Mice MH - Mice, Inbred C57BL MH - Nitric Oxide Synthase/physiology MH - Nitric Oxide Synthase Type II MH - Phospholipases/physiology MH - Receptors, Interferon/physiology MH - Trigeminal Ganglion/microbiology MH - Interferon gamma Receptor PMC - PMC97990 EDAT- 2001/02/13 11:00 MHDA- 2001/03/17 10:01 PMCR- 2001/02/01 CRDT- 2001/02/13 11:00 PHST- 2001/02/13 11:00 [pubmed] PHST- 2001/03/17 10:01 [medline] PHST- 2001/02/13 11:00 [entrez] PHST- 2001/02/01 00:00 [pmc-release] AID - 1016 [pii] AID - 10.1128/IAI.69.2.1093-1100.2001 [doi] PST - ppublish SO - Infect Immun. 2001 Feb;69(2):1093-100. doi: 10.1128/IAI.69.2.1093-1100.2001.