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Metabolite profile deviations in an oral glucose tolerance test—a comparison between lean and obese individuals
Author(s) -
Geidenstam Nina,
Spégel Peter,
Mulder Hindrik,
Filipsson Karin,
Ridderstråle Martin,
Danielsson Anders P.H.
Publication year - 2014
Publication title -
obesity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.438
H-Index - 199
eISSN - 1930-739X
pISSN - 1930-7381
DOI - 10.1002/oby.20868
Subject(s) - metabolite , endocrinology , medicine , lipolysis , metabolomics , body mass index , metabolome , chemistry , ketogenesis , metabolism , ketone bodies , adipose tissue , chromatography
Objective While impaired glucose tolerance diagnosed by the oral glucose tolerance test (OGTT) is a common trait in obese individuals, less is known about changes in levels of other metabolites. The aim was to reveal the complex alterations in metabolite levels provoked by an OGTT and its perturbation in obese individuals. Methods Gas chromatography/mass spectrometry was used to profile metabolite levels in serum from 14 obese participants (body mass index [BMI] of 43.6 ± 1.5 kg m −2 [mean ± SEM]) at 0, 30, and 120 min during a standard 2‐h 75 g OGTT. Metabolite profiles from six lean individuals (BMI of 22.4 ± 2.4 kg m −2 ), collected from a previous study, were included for comparison. Results In the obese group, 59 metabolite profiles were determined. Among these, 16 deviated from profiles in the lean group. Deviating metabolites were categorized into three groups. [1][French SA, 2012] Delayed reduction in levels of five fatty acids. [2][Kahn SE, 2006] Increased levels at 30 min of five amino acids, including isoleucine and leucine. [3][Sirinek KR, 1985] A blunted increase at 30 min of six metabolites. Conclusions Metabolomics analysis revealed distinct differences in alterations of metabolite levels during an OGTT in obese and lean subjects. To this end, our data suggests a disrupted regulation of ketogenesis, lipolysis and proteolysis in obese individuals.