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Microbes and Infection
Article . 2011 . Peer-reviewed
License: Elsevier Non-Commercial
Data sources: Crossref
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Differential immune response of adipocytes to virulent and attenuated Mycobacterium tuberculosis

Authors: Jong-Seok, Kim; Min-Jeong, Ryu; Eui-Hong, Byun; Woo Sik, Kim; Jake, Whang; Ki-Nam, Min; Minho, Shong; +2 Authors

Differential immune response of adipocytes to virulent and attenuated Mycobacterium tuberculosis

Abstract

Mycobacterium tuberculosis (M. tb) takes advantage of various cell types, allowing it to remain in the host for long periods. Because adipocytes have been proposed as niches for dormant M. tb in the latent state, understanding the interaction of virulent M. tb with adipocytes is important. We compared changes in cytokine secretion from 3T3-L1 murine adipocytes infected with virulent M. tb H37Rv (V-M. tb) and attenuated M. tb H37Ra (A-M. tb) strains. Both strains maintained non-replicating states within adipocytes until 10 days post-infection. Adipocytes infected with V-M. tb secreted lower levels of pro-inflammatory cytokines, such as tumor necrosis factor-α, interleukin (IL)-12p40, IL-6, and IL-17, and lower levels of nitric oxide than those infected with A-M. tb. In contrast, the anti-inflammatory cytokines, IL-10 and IL-4, were markedly induced in V-M. tb-infected adipocytes versus those infected with A-M. tb at an early time point. Heat-killed or formalin-fixed bacteria induced lower levels of cytokines and no difference was observed between strains. Moreover, V-M. tb induced a high level of necrosis versus A-M. tb in conjunction with increased levels of LHD. These results suggest that V-M. tb regulates cytokine expression in its favor, increasing cytokines necessary for immune evasion and decreasing those required for protective immunity.

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Keywords

Hot Temperature, Interleukin-12 Subunit p40/immunology, Mice, Interleukin-4/immunology, Adipocytes, Extracellular Space/chemistry, Adipocytes/microbiology, Interleukin-17/biosynthesis, Microscopy, Adipocyte, Blotting, Interleukin-12 Subunit p40, Interleukin-17, Interleukin-10/biosynthesis, Interleukin-12 Subunit p40/biosynthesis, Interleukin-10, L-Lactate Dehydrogenase/analysis, Tuberculosis/immunology*, Western, 570, Blotting, Western, Mycobacterium tuberculosis/growth & development, Tumor Necrosis Factor-alpha/biosynthesis, 610, Immune Evasion*, Fluorescence, 3T3-L1 Cells, Formaldehyde, L-Lactate Dehydrogenase/metabolism, Mycobacterium tuberculosis/pathogenicity, Animals, Humans, Tuberculosis, Tuberculosis/microbiology, Cytokine, Immune Evasion, L-Lactate Dehydrogenase, Interleukin-6, Tumor Necrosis Factor-alpha, Interleukin-4/biosynthesis, Nitric oxide, Mycobacterium tuberculosis, Tumor Necrosis Factor-alpha/immunology, Interleukin-6/biosynthesis, Interleukin-17/immunology, Mycobacterium tuberculosis/immunology*, Microscopy, Fluorescence, Adipocytes/immunology*, Interleukin-6/immunology, Interleukin-4, Interleukin-10/immunology, Extracellular Space

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    popularity
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    influence
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
21
Top 10%
Average
Top 10%
Green