PuSH - Publication Server of Helmholtz Zentrum München: Comprehensive metabolic characterization of serum osteocalcin action in a large non-diabetic sample.

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Entenmann, L.* ; Pietzner, M.* ; Artati, A. ; Hannemann, A.* ; Henning, A.K.* ; Kastenmüller, G. ; Völzke, H.* ; Nauck, M.* ; Adamski, J. ; Wallaschofski, H.* ; Friedrich, N.*

Comprehensive metabolic characterization of serum osteocalcin action in a large non-diabetic sample.

PLoS ONE 12:e0184721 (2017)

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Recent research suggested a metabolic implication of osteocalcin (OCN) in e.g. insulin sensitivity or steroid production. We used an untargeted metabolomics approach by analyzing plasma and urine samples of 931 participants using mass spectrometry to reveal further metabolic actions of OCN. Several detected relations between OCN and metabolites were strongly linked to renal function, however, a number of associations remained significant after adjustment for renal function. Intermediates of proline catabolism were associated with OCN reflecting the implication in bone metabolism. The association to kynurenine points towards a pro-inflammatory state with increasing OCN. Inverse relations with intermediates of branch-chained amino acid metabolism suggest a link to energy metabolism. Finally, urinary surrogate markers of smoking highlight its adverse effect on OCN metabolism. In conclusion, the present study provides a read-out of metabolic actions of OCN. However, most of the associations were weak arguing for a limited role of OCN in whole-body metabolism.

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