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Infection with the Lyme disease pathogen suppresses innate immunity in mice with diet-induced obesity.

08:00 EDT 29th October 2016 | BioPortfolio

Summary of "Infection with the Lyme disease pathogen suppresses innate immunity in mice with diet-induced obesity."

Obesity is a major global public health concern. Immune responses implicated in obesity also control certain infections. We investigated the effects of high fat diet (HFD)-induced obesity (DIO) on infection with the Lyme disease bacterium Borrelia burgdorferi in mice. DIO was associated with systemic suppression of neutrophil- and macrophage-based innate immune responses. These included bacterial uptake and cytokine production, and systemic, progressive impairment of bacterial clearance and increased carditis severity. B. burgdorferi-infected mice fed normal diet also gained weight at the same rate as uninfected mice fed HFD, Toll-like receptor 4 deficiency rescued bacterial clearance defects, which were greater in females than males, and killing of an unrelated bacterium (Escherichia coli) by bone marrow-derived macrophages from obese, B. burgdorferi-infected mice was also affected. Importantly, innate immune suppression increased with infection duration and depended on cooperative and synergistic interactions between DIO and B. burgdorferi infection. Thus, obesity and B. burgdorferi infection cooperatively and progressively suppressed innate immunity in mice.

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This article was published in the following journal.

Name: Cellular microbiology
ISSN: 1462-5822
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Cytosolic signaling adaptor proteins that were initially discovered by their role in the innate immunity (IMMUNITY, INNATE) response of organisms that lack an adaptive immune system. This class of proteins contains three domains, a C-terminal ligand recognition domain, an N-terminal effector-binding domain, and a centrally located nuclear-binding oligomerization domain. Many members of this class contain a C-terminal leucine rich domain which binds to PEPTIDOGLYCAN on the surface of BACTERIA and plays a role in pathogen resistance.

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The non-susceptibility to infection of a large group of individuals in a population. A variety of factors can be responsible for herd immunity and this gives rise to the different definitions used in the literature. Most commonly, herd immunity refers to the case when, if most of the population is immune, infection of a single individual will not cause an epidemic. Also, in such immunized populations, susceptible individuals are not likely to become infected. Herd immunity can also refer to the case when unprotected individuals fail to contract a disease because the infecting organism has been banished from the population.

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