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Functional Development of the Mammary Gland: Use of Expression Profiling and Trajectory Clustering to Reveal Changes in Gene Expression During Pregnancy, Lactation, and Involution

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Abstract

To characterize the molecular mechanisms by which progesterone withdrawal initiates milk secretion, we examined global gene expression during pregnancy and lactation in mice, focusing on the period around parturition. Trajectory clustering was used to profile the expression of 1358 genes that changed significantly between pregnancy day 12 and lactation day 9. Predominantly downward trajectories included stromal and proteasomal genes and genes for the enzymes of fatty acid degradation. Milk protein gene expression increased throughout pregnancy, whereas the expression of genes for lipid synthesis increased sharply at the onset of lactation. Examination of regulatory genes with profiles similar or complementary to those of lipid synthesis genes led to a model in which progesterone stimulates synthesis of TGF-β, Wnt 5b, and IGFBP-5 during pregnancy. These factors are suggested to repress secretion by interfering with PRL and IGF-1 signaling. With progesterone withdrawal, PRL and IGF-1 signaling are activated, in turn activating Akt/PKB and the SREBPs, leading to increased lipid synthesis.

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Authors and Affiliations

  1. Department of Physiology and Biophysics, University of Colorado Health Sciences Center, Denver, Colorado

    Michael C. Rudolph & Margaret C. Neville

  2. Department of Obstetrics and Gynecology, University of Colorado Health Sciences Center, Denver, Colorado

    James L. McManaman

  3. Department of Pharmacology, University of Colorado Health Sciences Center, Denver, Colorado

    Larry Hunter & Tzulip Phang

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  1. Michael C. Rudolph
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  2. James L. McManaman
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  4. Tzulip Phang
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Correspondence to Margaret C. Neville.

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Rudolph, M.C., McManaman, J.L., Hunter, L. et al. Functional Development of the Mammary Gland: Use of Expression Profiling and Trajectory Clustering to Reveal Changes in Gene Expression During Pregnancy, Lactation, and Involution. J Mammary Gland Biol Neoplasia 8, 287–307 (2003). https://doi.org/10.1023/B:JOMG.0000010030.73983.57

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