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Hofmann, Tobias; Weibert, Elena; Ahnis, Anne; Elbelt, Ulf; Rose, Matthias; Klapp, Burghard F.; Stengel, Andreas
Peptides (New York, N.Y. : 1980), February 2017, 2017-02-00, 20170201, Letnik: 88Journal Article
•Phoenixin is a recently discovered peptide initially implicated in reproduction.•Phoenixin was also shown to have an anxiolytic effect in mice.•Phoenixin is detectable in the circulation in humans.•Phoenixin shows a negative association with anxiety in obese men.•Phoenixin might be an interesting target in the treatment of anxiety disorders. Phoenixin was recently identified in the rat hypothalamus and initially implicated in reproductive functions. A subsequent study described an anxiolytic effect of the peptide. The aim of the study was to investigate a possible association of circulating phoenixin with anxiety in humans. We therefore enrolled 68 inpatients with a broad spectrum of psychometrically measured anxiety (GAD-7). We investigated men since a menstrual cycle dependency of phoenixin has been assumed. Obese subjects were enrolled since they often report psychological comorbidities. In addition, we also assessed depressiveness (PHQ-9) and perceived stress (PSQ-20). Plasma phoenixin levels were measured using a commercial ELISA. First, we validated the ELISA kit performing a spike-and-recovery experiment showing a variance of 6.7±8.8% compared to the expected concentrations over the whole range of concentrations assessed, while a lower variation of 1.6±0.8% was observed in the linear range of the assay (0.07–2.1ng/ml). We detected phoenixin in the circulation of obese men at levels of 0.68±0.50ng/ml. These levels showed a negative association with anxiety scores (r=−0.259, p=0.043), while no additional associations with other psychometric parameters were observed. In summary, phoenixin is present in the human circulation and negatively associated with anxiety in obese men, a population often to report comorbid anxiety.
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