Prostate CSCs sensitive to gamma-tocotrienol?

Gamma-Tocotrienol Kills Prostate Cancer Stem Cells, PRNewswire, July 25, 2010. Excerpt:

The scientists found that low doses of gamma-tocotrienol cause apoptosis in the prostate cancer stem cells and suppress their colony formation capability. This results in a lower prostate cancer stem cell population (as defined by the protein markers CD133 and CD44). Further tests in mice models were conducted, where mice implanted with hormonal refractory prostate cancer cells were given gamma-tocotrienol orally. The results showed that gamma- tocotrienol not only reduced tumour size formed, but also decreased the incidence rate of tumour formation by 75%, as compared to the control group of mice, which had 100% tumour formation. These results strongly suggest that gamma-tocotrienol could be developed for prostate cancer prevention and treatment.

The news release by Davos Life Science is based on the publication:

Gamma-tocotrienol as an effective agent in targeting prostate cancer stem cell-like population by Sze Ue Luk and 11 co-authors, including Ming-Tat Ling, Int J Cancer 2010(Jul 8) [Epub ahead of print][PubMed citation].

Comment:

See also a relevant patent application: (WO/2010/047663) Use of Tocotrienol Composition for the Prevention of Cancer.
Publication Date: 29.04.2010
Applicants: DAVOS LIFE SCIENCE PTE. LTD. [SG/SG]; 16 Tuas South Street 5 Singapore 637795 (SG) (All Except US).
LING, Ming Tat [CN/AU]; (AU) (US Only).
YAP, Wei Ney [MY/SG]; (SG) (US Only).
WONG, Yong Chuan [MY/CN]; (CN) (US Only).
YAP, Yee Leng, Daniel [MY/SG]; (SG) (US Only).

Researchers find new kind of prostate SC in mice

New Type Of Adult Stem Cells Found In Prostate May Be Involved In Cancer Development, ScienceDaily, September 10, 2009. Excerpts:

The new study may resolve this conundrum because the newly discovered adult stem cells are also luminal cells. "Previous research suggested that prostate cancer originates from basal stem cells, and that during cancer formation these cells differentiate into luminal cells," said Dr. Shen. "Instead, CARNs may represent a luminal origin for prostate cancer" [CARNs stands for "castration-resistant Nkx3.1-expressing cells"].

And indeed, the researchers found that CARNs in mice can give rise to prostate cancers, after the cells lose the activity of PTEN, a gene that is frequently mutated in human prostate cancers.

See also: New Progenitor Cell in Mice Can Cause Prostate Cancer, Michael Smith, Medpage Today, September 9, 2009; Researchers find prostate cancer stem cell, Reuters, September 9, 2009.

These news items are about the publication: A luminal epithelial stem cell that is a cell of origin for prostate cancer by Xi Wang and 9 co-authors, including Michael M Shen, Nature 2009(Sep 9) [Epub ahead of print][PubMed Citation].

Comment: These CSCs were found in mice, and "it is unclear whether CARNs exist in the normal human prostate and if human prostate cancers can originate from these CARNs" (see last paragraph of the Medpage Today article).

Found via: Two Studies Make Promising Advances in Prostate Cancer Research, Denis Cummings, FindingDulcinea, September 10, 2009.

A first step toward identifying prostate CSC

Making the paper: Wei-Qiang Gao, Nature 2008(Dec 11); 456(7723): xiii [Published online 10 December 2008]. Excerpt:

Search for prostate-cancer target identifies stem-cell population.

The cancer-stem-cell theory holds that tumours are formed by a very small population of self-renewing cells. The idea is controversial, but developmental biologist Wei-Qiang Gao hasn't allowed that to hamper his lab's quest to find such cells in the prostate. He and his colleagues have achieved an important first step — identifying the normal adult stem cells responsible for generating prostate tissue in mice.

[This article is not publicly accessible].