Abstract
Purpose
Human breast milk is the optimal source of nutrients for growing infants. However, many circumstances can arise which preclude breast milk feeding, leading to the use of infant formula, including during the weaning period. Many diet-related effects are modulated by the gut microbiome. Therefore, we investigated the effect of human milk (HM) or infant formula (IF) on the gut microbiota in weanling rats.
Methods
The gut microbiota of weanling male Sprague–Dawley rats fed HM or IF for 28 days was analysed by shotgun metagenome sequencing. Caecal contents were analysed by liquid chromatography–mass spectrometry metabolomics.
Results
Numerous genera within the Proteobacteria phylum were relatively more abundant in the ileum, caecum, and colon of rats fed HM, including ileal Escherichia (HM = 9.6% ± 4.3 SEM; IF = 0.9% ± 0.3 SEM; P = 0.03). Other taxa that differed between HM- and IF-fed rats included Prevotella and Ruminococcus. Overall, more differences were observed in the ileum than the caecum and colon between rats fed HM and IF. For the rats fed IF, in the ileum, the relative abundance of Bifidobacterium was higher (HM = 1.7% ± 0.7 SEM; IF = 5.0% ± 1.5 SEM; P = 0.04) with gene functions related to carbohydrate and amino acid metabolism also decreased. In the caecum, metabolic features such as bile acids were elevated while amino sugars were also decreased.
Conclusion
Our results show that HM and IF composition differences are reflected in the gut microbiome composition and function in both the small and large intestines.
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Acknowledgements
We would like to acknowledge the technical assistance of Hedley Stirrat for the metabolomics analysis and Paul Maclean for bioinformatics support. All authors designed the study; WY wrote the manuscript with input from all authors; ZL, AS, KF, HJ, WC, LD, NCR, and WY conducted the research and analysed the data; WY, NCR, LD had primary responsibility for the final content. All authors read and approved the final manuscript.
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This study was funded by Bright Dairy & Food Co. Ltd. Zhenmin Liu, Hongxin Jia, and Wenliang Chen are employees of Bright Dairy & Food Co. Ltd. Bright Dairy & Food Co. Ltd is a producer of infant formulae; Arvind Subbaraj, Karl Fraser, Li Day, Nicole, and Wayne Young declare no conflict of interests.
Ethics
Collection of HM was performed with approved consent by participants, Approval no. XHEC-C-2012-024, Xinhua Hospital Ethics Committee Affiliated to Shanghai Jiào tong University School of Medicine. The animal study was conducted under the oversight of the AgResearch Grasslands Animal Ethics Committee (approval number AEC13099; Palmerston North, New Zealand) in accordance with the New Zealand Animal Welfare Act 1999.
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Liu, Z., Subbaraj, A., Fraser, K. et al. Human milk and infant formula differentially alters the microbiota composition and functional gene relative abundance in the small and large intestines in weanling rats. Eur J Nutr 59, 2131–2143 (2020). https://doi.org/10.1007/s00394-019-02062-w
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DOI: https://doi.org/10.1007/s00394-019-02062-w