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How sleeping mammary stem cells are awakened in puberty
26 October 2018
Our researchers have discovered how the growth of milk-producing mammary glands is triggered during puberty.
Dr Nai Yang Fu (R) have discovered a factor that triggers
the growth of milk-producing mammary glands during puberty.
Sleeping stem cells in the mammary gland are awoken by a protein dubbed FoxP1, according to the research that was published today in the journal Developmental Cell.
The research expands our knowledge of how the mammary gland – a component of the human breast – develops from stem cells, underpinning a better understanding of how defects in this process lead to breast cancer. The research was led by Dr Nai Yang Fu, Professor Jane Visvader and Professor Geoff Lindeman who is also a medical oncologist at the Royal Melbourne Hospital and the Peter MacCallum Cancer Centre, in collaboration with Professor Gordon Smyth and his bioinformatics team.
At a glance
- Stem cells – the cells that can give rise to a range of other cells types – are often found in a dormant state in our body, and little is known about how they are awakened into an activated state.
- Our researchers discovered ‘sleeping’ mammary stem cells are awoken at puberty by a gene called FoxP1. This triggers the rapid growth and development of mammary glands.
- Without FoxP1, the mammary stem cells are locked in a dormant state and mammary glands could not grow
Waking up stem cells
for the growth of mammary glands (dark purple)
Stem cells in the mammary gland exist in a largely dormant or ‘sleeping’ state throughout life. In puberty, these stem cells need to be ‘woken up’ to drive the rapid expansion of the mammary gland, said Professor Visvader.
“The mammary stem cells are ready for a signal to start dividing,” she said. “We discovered that a gene called FoxP1 is an essential part of this signal in puberty and the adult.”
FoxP1 switches off the production of other proteins within cells – by repressing their genes.
“We discovered that FoxP1 switches off the production of one of the key proteins that keep mammary stem cells asleep. As the level of this protein drops, the stem cells wake up and begin to divide, driving mammary gland growth,” Dr Fu said.
The importance of team work
The project relied on collaboration between scientists with diverse skills, said Professor Visvader.
was critical for the discovery of how their growth is triggered
in puberty.
“This project brought together expertise in cell biology, developmental biology, bioinformatics and imaging to solve the question of how mammary stem cells are awoken in puberty and adult breast tissue.
“We’re still looking for the precise connections linking female hormones and FoxP1, but we are one step closer to understanding the detailed process of breast development. This is also helping us to connect faulty cells that contribute to breast development with the development of breast cancer,” she said.
The research was supported by the Australian National Health and Medical Research Council, the Australian Cancer Research Foundation, Cure Cancer Australia, the National Breast Cancer Foundation, the Victorian Cancer Agency and the Victorian Government.
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In 2006 our breast cancer research team had a eureka moment: the discovery of breast stem cells.
Explore the story on our Discovery Timeline.
We have discovered that breast stem cells and their ‘daughters’ have a much longer lifespan than previously thought
Professor Jane Visvader has been awarded the 2014 Royal Society of Victoria Medal for Excellence in Scientific Research.
This animation from WEHI.TV visualises research published in Nature Medicine in 2009 by Professor Jane Visvader and Professor Geoff Lindeman.
Video 1:06