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Stewart TA, Hughes K, Stevenson AJ, Marino N, Ju AL, Morehead M, Davis FM. Mammary mechanobiology - investigating roles for mechanically activated ion channels in lactation and involution. J Cell Sci 2021; 134:jcs248849. [PMID: 33262312 DOI: 10.1242/jcs.248849] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 11/06/2020] [Indexed: 01/14/2023] Open
Abstract
The ability of a mother to produce a nutritionally complete neonatal food source has provided a powerful evolutionary advantage to mammals. Milk production by mammary epithelial cells is adaptive, its release is exquisitely timed, and its own glandular stagnation with the permanent cessation of suckling triggers the cell death and tissue remodeling that enables female mammals to nurse successive progeny. Chemical and mechanical signals both play a role in this process. However, despite this duality of input, much remains unknown about the nature and function of mechanical forces in this organ. Here, we characterize the force landscape in the functionally mature gland and the capacity of luminal and basal cells to experience and exert force. We explore molecular instruments for force-sensing, in particular channel-mediated mechanotransduction, revealing increased expression of Piezo1 in mammary tissue in lactation and confirming functional expression in luminal cells. We also reveal, however, that lactation and involution proceed normally in mice with luminal-specific Piezo1 deletion. These findings support a multifaceted system of chemical and mechanical sensing in the mammary gland, and a protective redundancy that ensures continued lactational competence and offspring survival.
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Affiliation(s)
- Teneale A Stewart
- Mater Research Institute-The University of Queensland, Faculty of Medicine, Woolloongabba, Queensland, 4102, Australia
- Translational Research Institute, Woolloongabba, Queensland, 4102, Australia
| | - Katherine Hughes
- Department of Veterinary Medicine, University of Cambridge, Cambridge, CB3 0ES, UK
| | - Alexander J Stevenson
- Mater Research Institute-The University of Queensland, Faculty of Medicine, Woolloongabba, Queensland, 4102, Australia
- Translational Research Institute, Woolloongabba, Queensland, 4102, Australia
| | - Natascia Marino
- Department of Medicine, Indiana University School of Medicine, Indianapolis, 46202, USA
- Susan G. Komen Tissue Bank at Indiana University Simon Cancer Center, Indianapolis, 46202, USA
| | - Adler L Ju
- Translational Research Institute, Woolloongabba, Queensland, 4102, Australia
| | - Michael Morehead
- Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, 26506, USA
| | - Felicity M Davis
- Mater Research Institute-The University of Queensland, Faculty of Medicine, Woolloongabba, Queensland, 4102, Australia
- Translational Research Institute, Woolloongabba, Queensland, 4102, Australia
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Organoid models for mammary gland dynamics and breast cancer. Curr Opin Cell Biol 2020; 66:51-58. [PMID: 32535255 DOI: 10.1016/j.ceb.2020.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/13/2020] [Accepted: 05/05/2020] [Indexed: 12/12/2022]
Abstract
The mammary gland is a highly dynamic tissue that undergoes repeated cycles of growth and involution during pregnancy and menstruation. It is also the site from which breast cancers emerge. Organoids provide an in vitro model that preserves several of the cellular, structural, and microenvironmental features that dictate mammary gland function in vivo and have greatly advanced our understanding of glandular biology. Their tractability for genetic manipulation, live imaging, and high throughput screening have facilitated investigation into the mechanisms of glandular morphogenesis, structural maintenance, tumor progression, and invasion. Opportunities remain to enhance cellular and structural complexity of mammary organoid models, including incorporating additional cell types and hormone signaling.
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Ritchie RH, Gregory KJ. Emerging Leaders in Pharmacology and Translational Science Special Issue Editorial. ACS Pharmacol Transl Sci 2020; 3:1-3. [PMID: 32259082 PMCID: PMC7088998 DOI: 10.1021/acsptsci.0c00014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Indexed: 12/31/2022]
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