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2014 ; 42
(ä): 96-108
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Kinetic characteristics of euflammation: the induction of controlled inflammation
without overt sickness behavior
#MMPMID24929192
Tarr AJ
; Liu X
; Reed NS
; Quan N
Brain Behav Immun
2014[Nov]; 42
(ä): 96-108
PMID24929192
show ga
We found recently that controlled progressive challenge with subthreshold levels
of E. coli can confer progressively stronger resistance to future
reinfection-induced sickness behavior to the host. We have termed this type of
inflammation "euflammation". In this study, we further characterized the kinetic
changes in the behavior, immunological, and neuroendocrine aspects of
euflammation. Results show euflammatory animals only display transient and subtle
sickness behaviors of anorexia, adipsia, and anhedonia upon a later infectious
challenge which would have caused much more severe and longer lasting sickness
behavior if given without prior euflammatory challenges. Similarly, infectious
challenge-induced corticosterone secretion was greatly ameliorated in
euflammatory animals. At the site of E.coli priming injections, which we termed
euflammation induction locus (EIL), innate immune cells displayed a partial
endotoxin tolerant phenotype with reduced expression of innate activation markers
and muted inflammatory cytokine expression upon ex vivo LPS stimulation, whereas
innate immune cells outside EIL displayed largely opposite characteristics.
Bacterial clearance function, however, was enhanced both inside and outside EIL.
Finally, sickness induction by an infectious challenge placed outside the EIL was
also abrogated. These results suggest euflammation could be used as an efficient
method to "train" the innate immune system to resist the consequences of future
infectious/inflammatory challenges.