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American Journal of Human Biology

Cytokine responses in relation to age, gender, body mass index, Mycobacterium tuberculosis infection, and otitis media among Inuit in Greenland.

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Nina O Nielsen
Bolette Soborg
Malene Børresen
Mikael Andersson
Anders Koch

Sleutelwoorden

Abstract

OBJECTIVE

To evaluate the cytokine response pattern in Inuit in Greenland in relation to age, gender, body mass index (BMI), Mycobacterium tuberculosis infection (MTI), and otitis media (OM) to assess whether Inuit may have signs of impaired immune responsiveness to infection.

METHODS

A cross-sectional health assessment was conducted among inhabitants of Maniitsoq, West Greenland, in 2009, and several health outcomes were measured. The prevalence of MTI, overweight, and obesity was assessed among 263 school children and 137 adults, and OM was assessed among the children. Cytokine responses were measured in whole blood cultures after stimulation with phytohemagglutinin or purified protein derivative (PPD). Associations between cytokine concentrations, age, gender, BMI, MTI, and OM were estimated by linear regression.

RESULTS

Adults had generally higher cytokine concentrations than children. Children with MTI had 2.7 times higher interleukin (IL)-10 concentrations than those without (P = 0.01), and girls had 80% higher IL-10 than boys (P < 0.01) after phytohemagglutinin stimulation. Interferon (IFN)γ and tumor necrosis factor (TNF) concentrations were strongly elevated among children (P(IFNγ) < 0.001 and P(TNF) < 0.001) and adults (P(IFNγ) < 0.001 and P(TNF) <0.01) with MTI compared to those without after PPD stimulation. Adult women had significantly lower IFNγ (P = 0.03) and TNF (P = 0.04) concentrations than men. TNF was positively correlated with BMI in children (P = 0.01), and IL-10 was positively correlated with BMI in adults (P = 0.0004) after PPD stimulation.

CONCLUSIONS

We found cytokine patterns similar to those reported from other immune competent study populations. Therefore, the study does not support the suggestion that Inuit may have impaired immune reactivity to infection.

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