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2017 ; 7
(ä): 316
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To Eat and to Be Eaten: Mutual Metabolic Adaptations of Immune Cells and
Intracellular Bacterial Pathogens upon Infection
#MMPMID28752080
Eisenreich W
; Rudel T
; Heesemann J
; Goebel W
Front Cell Infect Microbiol
2017[]; 7
(ä): 316
PMID28752080
show ga
Intracellular bacterial pathogens (IBPs) invade and replicate in different cell
types including immune cells, in particular of the innate immune system (IIS)
during infection in the acute phase. However, immune cells primarily function as
essential players in the highly effective and integrated host defense systems
comprising the IIS and the adaptive immune system (AIS), which cooperatively
protect the host against invading microbes including IBPs. As countermeasures,
the bacterial pathogens (and in particular the IBPs) have developed strategies to
evade or reprogram the IIS at various steps. The intracellular replication
capacity and the anti-immune defense responses of the IBP's as well as the
specific antimicrobial responses of the immune cells of the innate and the AIS
depend on specific metabolic programs of the IBPs and their host cells. The
metabolic programs of the immune cells supporting or counteracting replication of
the IBPs appear to be mutually exclusive. Indeed, recent studies show that upon
interaction of naïve, metabolically quiescent immune cells with IBPs, different
metabolic activation processes occur which may result in the provision of a
survival and replication niche for the pathogen or its eradication. It is
therefore likely that within a possible host cell population subsets exist that
are metabolically programmed for pro- or anti-microbial conditions. These
metabolic programs may be triggered by the interactions between different
bacterial agonistic components and host cell receptors. In this review, we
summarize the current status in the field and discuss metabolic adaptation
processes within immune cells of the IIS and the IBPs that support or restrict
the intracellular replication of the pathogens.