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Riedel, E.O.* ; Hinrichs, A.* ; Kemter, E.* ; Dahlhoff, M.* ; Backman, M.* ; Rathkolb, B. ; Prehn, C. ; Adamski, J. ; Renner, S.* ; Blutke, A. ; Hrabě de Angelis, M. ; Bidlingmaier, M.* ; Schopohl, J.* ; Arnold, G.J.* ; Fröhlich, T.* ; Wolf, E.*

Functional changes of the liver in the absence of growth hormone (GH) action - Proteomic and metabolomic insights from a GH receptor deficient pig model.

Mol. Metab. 36:100978 (2020)
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Objective: The liver is a central target organ of growth hormone (GH), which stimulates the synthesis of insulin-like growth factor 1 (IGF1) and affects multiple biochemical pathways. A systematic multi-omics analysis of GH effects in the liver has not been performed. GH receptor (GHR) deficiency is a unique model for studying the consequences of lacking GH action. In this study, we used molecular profiling techniques to capture a broad spectrum of these effects in the liver of a clinically relevant large animal model for Laron syndrome.Methods: We performed holistic proteome and targeted metabolome analyses of liver samples from 6-month-old GHR-deficient (GHR-KO) pigs and GHR-expressing controls (four males, four females per group).Results: GHR deficiency resulted in an increased abundance of enzymes involved in amino acid degradation, in the urea cycle, and in the tricarboxylic acid cycle. A decreased ratio of long-chain acylcarnitines to free carnitine suggested reduced activity of carnitine palmitoyltransferase 1A and thus reduced mitochondrial import of fatty acids for beta-oxidation. Increased levels of short-chain acylcarnitines in the liver and in the circulation of GHR-KO pigs may result from impaired beta-oxidation of short-chain fatty acids or from increased degradation of specific amino acids. The concentration of mono-unsaturated glycerophosphocholines was significantly increased in the liver of GHR-KO pigs without morphological signs of steatosis, although the abundances of several proteins functionally linked to non-alcoholic fatty liver disease (fetuin B, retinol binding protein 4, several mitochondrial proteins) were increased. Moreover, GHR-deficient liver samples revealed distinct changes in the methionine and glutathione metabolic pathways, in particular, a significantly increased level of glycine N-methyltransferase and increased levels of total and free glutathione. Several proteins revealed a sex-related abundance difference in the control group but not in the GHR-KO group.Conclusions: Our integrated proteomics/targeted metabolomics study of GHR-deficient and control liver samples from a clinically relevant large animal model identified a spectrum of biological pathways that are significantly altered in the absence of GH action. Moreover, new insights into the role of GH in the sex-related specification of liver functions were provided.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Liver ; Growth Hormone ; Laron Syndrome ; Pig Model ; Proteomics ; Metabolomics; Laron-syndrome; Sexual-dimorphism; Gene; Expression; Methionine; Protein; Dwarf; Involvement; Mechanisms; Resistance
ISSN (print) / ISBN 2212-8778
e-ISSN 2212-8778
Journal Molecular Metabolism
Quellenangaben Volume: 36, Issue: , Pages: , Article Number: 100978 Supplement: ,
Publisher Elsevier
Publishing Place Amsterdam
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Experimental Genetics (IEG)
Molekulare Endokrinologie und Metabolismus (MEM)
Research Unit Analytical Pathology (AAP)
CF Pathology & Tissue Analytics (CF-PTA)
Grants Deutsche Forschungsgemeinschaft
German Federal Ministry of Education and Research (BMBF)