Abstract
Maternal health and diet can have important consequences for offspring nutrition and metabolic health. During lactation, signals are communicated from the mother to the infant through milk via macronutrients, hormones, and bioactive molecules. In this study we designed experiments to probe the mother-milk-infant triad in the condition of normal maternal health and upon exposure to high fat diet (HFD) with or without concurrent metformin exposure. We examined maternal characteristics, milk composition and offspring metabolic parameters on postnatal day 16, prior to offspring weaning. We found that lactational HFD increased maternal adipose tissue weight, mammary gland adipocyte size, and altered milk lipid composition causing a higher amount of omega-6 (n6) long chain fatty acids and lower omega-3 (n3). Offspring of HFD dams were heavier with more body fat during suckling. Metformin (Met) exposure decreased maternal blood glucose and several milk amino acids. Offspring of met dams were smaller during suckling. Gene expression in the lactating mammary glands was impacted to a greater extent by metformin than HFD, but both metformin and HFD altered genes related to muscle contraction, indicating that these genes may be more susceptible to lactational stressors. Our study demonstrates the impact of common maternal exposures during lactation on milk composition, mammary gland function and offspring growth with metformin having little capacity to rescue the offspring from the effects of a maternal HFD during lactation.
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RNA seq data is available and has been linked to this manuscript.
Change history
31 October 2023
Updated the name tagging of the 3rd author as follows given name is "Noura" and last name is "El Habbal".
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Funding
BG is supported by K08 DK102526, R56 DK121787, and the Amendt-Heller Award for Newborn Research. DB is supported by R01 DK107535. Amino acid and long-chain fatty acid levels were analyzed at the Michigan Regional Comprehensive Metabolomics Resource Core (MRC2) supported by grant DK097153 to the University of Michigan. We would also like to acknowledge the White Adipose Tissue Core, which is a part of the Michigan Nutrition and Obesity Center (P30 DK089503) for instruction in adipocyte size analysis. Body composition measurements were done with the assistance of the Mouse Metabolic Phenotyping Center (U2CDK110768). Histology was performed by the Rogel Cancer Center Histology Core (P30 CA04659229). RNA Sequencing was performed by the University of Michigan Advanced Genomics Core. ZC was funded by an internship through the Momentum Center of the University of Michigan.
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BG was responsible for the study design and conceived the original idea. ZC, BG, HH, NEH, EH, SL, NB, MA, CR, and HR carried out the experiments. ZC, HH, NB, BG, NEH and DB performed data analysis. Manuscript preparation was done by HH, BG, ZC, NEH, and DB. Manuscript editing was completed by ZC, EH, SL, NB, MA, CR, and HR. Input and approval on the final manuscript was provided by all authors.
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Carlson, Z., Hafner, H., El Habbal, N. et al. Short Term Changes in Dietary Fat Content and Metformin Treatment During Lactation Impact Milk Composition and Mammary Gland Morphology. J Mammary Gland Biol Neoplasia 27, 1–18 (2022). https://doi.org/10.1007/s10911-022-09512-y
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DOI: https://doi.org/10.1007/s10911-022-09512-y