期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 43, 页码 26822-26832出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2016905117
关键词
calcium signaling; GCaMP6; mammary gland; lactation; oxytocin
资金
- National Health and Medical Research Council [1141008, 1138214]
- University of Queensland
- Mater Foundation (Equity Trustees/AE Hingeley Trust)
- National Stem Cell Foundation of Australia
- National Health and Medical Research Council of Australia [1138214, 1141008] Funding Source: NHMRC
The mammary epithelium is indispensable for the continued survival of more than 5,000 mammalian species. For some, the volume of milk ejected in a single day exceeds their entire blood volume. Here, we unveil the spatiotemporal properties of physiological signals that orchestrate the ejection of milk from alveolar units and its passage along the mammary ductal network. Using quantitative, multidimensional imaging of mammary cell ensembles from GCaMP6 transgenic mice, we reveal how stimulus evoked Ca2+ oscillations couple to contractions in basal epithelial cells. Moreover, we show that Ca2+-dependent contractions generate the requisite force to physically deform the innermost layer of lumina! cells, compelling them to discharge the fluid that they produced and housed. Through the collective action of thousands of these biological positive-displacement pumps, each linked to a contractile ductal network, milk begins its passage toward the dependent neonate, seconds after the command.
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