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Open Access 01-04-2018 | Original Article

Impaired natural killer cell subset phenotypes in human obesity

Authors: Ina Bähr, Janine Jahn, Alexander Zipprich, Inge Pahlow, Julia Spielmann, Heike Kielstein

Published in: Immunologic Research | Issue 2/2018

Abstract

Obesity is associated with alterations in functionality of immune cells, like macrophages and natural killer (NK) cells, leading to an increased risk for severe infections and several cancer types. This study aimed to examine immune cell populations and functional NK cell parameters focusing on NK cell subset phenotypes in normal-weight and obese humans. Therefore, peripheral blood mononuclear cells (PBMCs) were isolated from normal-weight and obese individuals and analyzed by flow cytometry. Results show no significant changes in the frequency of monocytes, B lymphocytes, or NKT cells but a significantly increased frequency of T lymphocytes in obesity. The frequency of total NK cells was unaltered, whereas the number of low cytotoxic CD56^bright NK cell subset was increased, and the number of high cytotoxic CD56^dim NK cell subset was decreased in obese subjects. In addition, the frequency of CD56^bright NK cells expressing the activating NK cell receptor NKG2D as well as intracellular interferon (IFN)-γ was elevated in the obese study group. In contrast, the frequency of NKG2D- and IFN-γ-positive CD56^dim NK cells was lower in obesity compared to normal-weight individuals. Moreover, the expression of the activation marker CD69 was decreased in NK cells, which can be attributed to a reduction of CD69-positive CD56^dim NK cells in obese subjects. In conclusion, data reveal an impaired NK cell phenotype and NK cell subset alterations in obese individuals. This NK cell dysfunction might be one link to the higher cancer risk and the elevated susceptibility for viral infections in obesity.

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Title: Impaired natural killer cell subset phenotypes in human obesity
Authors: Ina Bähr
Janine Jahn
Alexander Zipprich
Inge Pahlow
Julia Spielmann
Heike Kielstein
Publication date: 01-04-2018
Publisher: Springer US
Published in: Immunologic Research / Issue 2/2018
Print ISSN: 0257-277X
Electronic ISSN: 1559-0755
DOI: https://doi.org/10.1007/s12026-018-8989-4

At a glance: The STEP trials

Springer Medicine

Impaired natural killer cell subset phenotypes in human obesity

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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