Significant alteration of liver metabolites by AAV8.Urocortin 2 gene transfer in mice with insulin resistance
Autoři:
Young Chul Kim aff001; Agnieszka D. Truax aff003; Dimosthenis Giamouridis aff001; N. Chin Lai aff001; Tracy Guo aff001; H. Kirk Hammond aff001; Mei Hua Gao aff001
Působiště autorů:
Veterans Affairs San Diego Healthcare System, San Diego, California, United States of America
aff001; Department of Medicine, University of California San Diego, San Diego, California, United States of America
aff002; Metabolon, Inc, Research Triangle Park, Morrisville, North Carolina, United States of America
aff003
Vyšlo v časopise:
PLoS ONE 14(12)
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pone.0224428
Souhrn
Introduction
Urocortin 2 (Ucn2) is a 38-amino acid peptide of the corticotropin-releasing factor family. Intravenous (IV) delivery of an adeno-associated virus vector serotype 8 encoding Ucn2 (AAV8.Ucn2) increases insulin sensitivity and glucose disposal in mice with insulin resistance.
Objective
To determine the effects of Ucn2 on liver metabolome.
Methods
Six-week-old C57BL6 mice were divided into normal chow (CHOW)-fed and high fat diet (HFD)-fed groups. The animals received saline, AAV8 encoding no gene (AAV8.Empt) or AAV8.Ucn2 (2x1013 genome copy/kg, IV injection). Livers were isolated from CHOW-fed and HFD-fed mice and analyzed by untargeted metabolomics. Group differences were statistically analyzed.
Results
In CHOW-fed mice, AAV8.Ucn2 gene transfer (vs. saline) altered the metabolites in glycolysis, pentose phosphate, glycogen synthesis, glycogenolysis, and choline-folate-methionine signaling pathways. In addition, AAV8.Ucn2 gene transfer increased amino acids and peptides, which were associated with reduced protein synthesis. In insulin resistant (HFD-induced) mice, HFD (vs CHOW) altered 448 (112 increased and 336 decreased) metabolites and AAV8.Ucn2 altered 239 metabolites (124 increased and 115 reduced) in multiple pathways. There are 61 metabolites in 5 super pathways showed interactions between diet and AAV8.Ucn2 treatment. Among them, AAV8.Ucn2 gene transfer reversed HFD effects on 13 metabolites. Finally, plasma Ucn2 effects were determined using a 3-group comparison of HFD-fed mice that received AAV8.Ucn2, AAV.Empt or saline, where 18 metabolites that altered by HFD (15 increased and 3 decreased), but restored levels to that seen in CHOW-fed mice by increased plasma Ucn2.
Conclusions
Metabolomics study revealed that AAV8.Ucn2 gene transfer, through increased plasma Ucn2, provided counter-HFD effects in restoring hepatic metabolites to normal levels, which could be the underlying mechanisms for Ucn2 effects on increasing glucose disposal and reducing insulin assistance.
Klíčová slova:
Amino acid metabolism – Gene transfer – Glucose metabolism – Insulin – Metabolic pathways – Metabolites – Protein metabolism – Xenobiotic metabolism
Zdroje
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PLOS One
2019 Číslo 12
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