Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Hormone sensitivity of breast stem cells presents drug target

12.04.2010
Researchers at the Walter and Eliza Hall Institute have discovered that breast stem cells are exquisitely sensitive to the female hormones oestrogen and progesterone, a finding that opens the way for the development of new preventions and treatments for breast cancer.

The discovery, by scientists in the institute's Stem Cells and Cancer and Bioinformatics divisions, also explains decades of evidence linking breast cancer risk to exposure to female hormones.

It has been published online today in the international journal Nature.

Dr Jane Visvader, who led the research with Dr Geoff Lindeman, said sustained exposure to oestrogen and progesterone was a well-established risk factor for breast cancer. "There is a clear evidence that the more menstrual cycles a woman has the greater her breast cancer risk," Dr Visvader said. "There is even an increase in breast cancer risk in the short-term following pregnancy. However the cellular basis for these observations has been poorly understood."

In the mid-2000s, Drs Visvader and Lindeman discovered breast stem cells in both mice and humans. Unexpectedly, however, they also found that breast stem cells lacked 'receptors' that would allow them to be directly controlled by the female hormones oestrogen and progesterone.

Now, work by Drs Visvader and Lindeman in collaboration with Drs Marie-Liesse Asselin-Labat, Gordon Smyth and others at the institute, has revealed that despite lacking receptors for oestrogen and progesterone, breast stem cells are still remarkably sensitive to female hormones.

Using mouse models, they showed that when the ovaries were removed or the animals were treated with hormone inhibitors (which are in clinical use as anti-breast cancer agents), breast stem cell numbers dropped and the cells appeared to become dormant.

Dr Lindeman, who is also a medical oncologist at the Royal Melbourne Hospital, said this finding helped to explain why the effects of 'chemoprevention' – a treatment aimed at breast cancer prevention continued long after anti-estrogen tablets have been stopped.

"Our research also revealed that during pregnancy there is a profound increase in breast stem cell numbers," Dr Lindeman said.

"This might account for the short-term increase in cancer risk associated with pregnancy."

Further studies, in collaboration with Dr Jack Martin at St Vincent's Institute Melbourne and Dr Hisataka Yasuda at the Nagahama Institute for Biochemical Science, identified the RANK ligand pathway as the key cell-signalling pathway responsible for the indirect control of breast stem cells in pregnancy.

Dr Lindeman said inhibitors of RANK signalling have been developed and are currently in clinical trials to help maintain bone strength and treat breast cancer that has spread to the bones. "Our discovery suggests that inhibitors of RANK or other stem cell pathways represent possible therapeutic strategies that could also be investigated as breast cancer prevention agents," Dr Lindeman said.

The research was supported by the Victorian Breast Cancer Research Consortium / Victoria Cancer Agency, Susan G. Komen Foundation, National Breast Cancer Foundation, National Health and Medical Research Council, and the Australian Cancer Research Foundation.

Penny Fannin | EurekAlert!
Further information:
http://www.wehi.edu.au

More articles from Life Sciences:

nachricht New risk factors for anxiety disorders
24.02.2017 | Julius-Maximilians-Universität Würzburg

nachricht Stingless bees have their nests protected by soldiers
24.02.2017 | Johannes Gutenberg-Universität Mainz

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>