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Plasma metabolomics profiling for fish maturation in blunt snout bream

ABSTRACT: We investigated the comprehensive metabolic profiles of plasma among immature females, mature females ready to spawn, as well as already spawned breeders of blunt snout bream (Megalobrama amblycephala). The purpose of this study was to screen out potential biomarkers for sexual mature female M. amblycephala compared to immature female individuals and already spawned breeders. The three groups were set up in this study, including one year old immature females, 2 years old sexually mature females ready to spawning and successfully spawning females of M. amblycephala. The plasma samples were collected to investigate the comprehensive metabolic profiles through UPLC-MS/MS based metabolomics analysis method. According to multivariate and univariate statistical analysis, plasma metabolite profiles of three groups were obviously separated, and the plasma metabolite profiles of immature female M. amblycephala were much more different from mature females ready to spawn as well as already spawned breeders. The differential plasma metabolites from three hormone related pathways including GnRH signaling pathway, steroid hormone biosynthesis and steroid biosynthesis, were further analyzed. A total of 29 metabolites were identified as differential biomarkers associated with the female maturation status

INSTRUMENT(S): QTOF

ORGANISM(S): Megalobrama Amblycephala Fish

TISSUE(S): Blood

SUBMITTER: LaiFang Zhou

PROVIDER: ST000522 | MetabolomicsWorkbench | Tue Dec 13 00:00:00 GMT 2016

REPOSITORIES: MetabolomicsWorkbench

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Project description:Worldwide, fetal growth restriction (FGR) affects 7 to 10% of pregnancies, or roughly 20.5 million infants, each year. FGR not only increases neonatal mortality and morbidity but also the risk of obesity in later life. Currently, the molecular mechanisms by which FGR "programs" an obese phenotype are not well understood. Studies demonstrate that FGR females are more prone to obesity compared to males; however, the molecular mechanisms that lead to the sexually dimorphic programming of FGR are not known. Thus, we hypothesized that FGR leads to the sexually dimorphic programming of preadipocytes and reduces their ability to differentiate into mature adipocytes. To test the hypothesis, we utilized a maternal hyperthermia-induced placental insufficiency to restrict fetal growth in sheep. We collected perirenal adipose tissue from male and female near-term FGR and normal-weight fetal lambs (N=4 in each group, 16 total), examined the preadipocytes' differentiation potential, and identified differential mRNA transcript expression in perirenal adipose tissue. Male FGR fetuses have lower cellular density compared to control male fetuses. However, no difference was observed in female FGR fetuses compared to control female fetuses. In addition, the ability of preadipocytes to differentiate into mature adipocytes with fat accumulation was impaired in male FGR fetuses, but this was not observed in female FGR fetuses. Finally, we examined the genes and pathways involved in the sexually dimorphic programming of obesity by FGR. On enrichment of differentially expressed genes in males compared to females, the Thermogenesis KEGG Pathway was downregulated, and the Metabolic and Steroid Biosynthesis KEGG pathways were upregulated. On enrichment of differentially expressed genes in male FGR compared to male control, the Steroid Biosynthesis KEGG Pathway was downregulated, and the PPAR Signaling KEGG pathway was upregulated. No pathways were altered in females in response to growth restriction in perirenal adipose tissue. Thus, the present study demonstrates a sexually dimorphic program in response to growth restriction in sheep fetal perirenal adipose tissue.

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Plasma metabolomics profiling for fish maturation in blunt snout bream

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