Abstract
Purpose
This study was aimed to investigate the effects of a maternal low-protein diet on transcriptional regulation of the myostatin (MSTN) gene in skeletal muscle of weaning piglets.
Methods
Sows were fed either a standard-protein (SP, 15 and 18 % crude protein) or a low-protein (LP, 50 % protein level of SP) diet throughout pregnancy and lactation. Longissimus dorsi muscle was sampled from male piglets at 28 days of age. The mRNA was determined by RT-PCR, and protein was measured by Western blot. Chromatin immunoprecipitation assay was used to determine the binding of transcription factors and histone H3 modifications on the MSTN gene promoter.
Results
The maternal LP diet significantly decreased body weight and average daily gain (P < 0.05), which was associated with significantly lower plasma concentration of urea nitrogen and total protein (P < 0.05), as well as decreased muscle RNA content (P < 0.05). MSTN mRNA (P < 0.05) was significantly increased, together with enhanced (P < 0.05) mRNA and protein expression of forkhead box class O family member protein 3 (FoxO3), and a tendency of an increase (P = 0.10) in glucocorticoid receptor (GR) mRNA in the muscle of LP piglets. Furthermore, the binding of both FoxO3 and GR to the MSTN gene promoter was significantly higher (P < 0.05) in muscle of LP piglets, together with significantly enriched (P < 0.05) gene activation markers, H3K9Ac and H3K4me3.
Conclusion
These results indicate that MSTN mediates maternal LP diet-induced growth retardation, through epigenetic regulation involving FoxO3 and GR binding to its promoter.
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Abbreviations
- ChIP:
-
Chromatin immunoprecipitation
- FoxO3:
-
Forkhead box class O family member protein 3
- GR:
-
Glucocorticoid receptor
- LM:
-
Longissimus dorsi muscle
- LP:
-
Low protein
- MSTN:
-
Myostatin
- SP:
-
Standard protein
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Acknowledgments
We thank Shanghai Farm of Bright Food (Group) Co., Ltd., for providing the experimental site and Rongkui Zhang for care of animals. In addition, we thank Dr. Wanyne J. Kuenzel of University of Arkansas for his suggestions on paper writing, especially for language revision. This work was supported by the National Basic Research Program of China (2012CB124703), the Special Fund for Agro-scientific Research in the Public Interest (201003011), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
Conflict of interest
Yimin Jia, Guichao Gao, Haogang Song, Demin Cai, Xiaojing Yang, and Ruqian Zhao declare no conflicts of interest.
Ethical standards
Operating procedures for animal breeding and husbandry were in accordance with Technical Regulations for Commercial Pig Production for Intensive Pig Farms (GB/T 17824.2-2008). The experimental protocol was approved by the Animal Ethics Committee of Nanjing Agricultural University with the project number 2012CB124703. The slaughter and sampling procedures complied with the “Guidelines on Ethical Treatment of Experimental Animals” (2006) No. 398 set by the Ministry of Science and Technology, China.
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Jia, Y., Gao, G., Song, H. et al. Low-protein diet fed to crossbred sows during pregnancy and lactation enhances myostatin gene expression through epigenetic regulation in skeletal muscle of weaning piglets. Eur J Nutr 55, 1307–1314 (2016). https://doi.org/10.1007/s00394-015-0949-3
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DOI: https://doi.org/10.1007/s00394-015-0949-3