Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

High levels of PEA-15 shrink breast cancer tumors

21.04.2009
Mouse model findings indicate protein is new, important target for therapy

Overexpression of PEA-15, which binds and drags an oncoprotein out of the cell nucleus where it fuels cancer growth, steeply reduced breast cancer tumors in a preclinical experiment, researchers at The University of Texas M. D. Anderson Cancer Center reported at the 100th annual meeting of the American Association for Cancer Research.

Human breast cancer grafts in mice dropped to nearly undetectable levels after 35 days when treated with an adenoviral PEA-15 vector that overexpressed the protein in tumors.

"Treated mice had a dramatic response, while tumors continued to grow in control mice," said first author and presenter Chandra Bartholomeusz, M.D., Ph.D., a post-doctoral fellow in M. D. Anderson's Department of Breast Medical Oncology. Bartholomeusz presented the findings at a minisymposium titled "Up and Coming Targeted Biologic Strategies."

"This first animal model experiment demonstrates the therapeutic potential of PEA-15," said senior author Naoto Ueno, M.D., Ph.D., associate professor of breast medical oncology. "PEA-15 is a different way of modulating growth because it's based on location of the protein in the cell rather than, for example, protein regulation by phosphorylation."

Ueno and colleagues previously showed that PEA-15 stymied ovarian cancer in lab experiments, and that high expression of the protein in tumors is tied to improved overall survival. They had also examined PEA-15 expression in 26 breast cancer specimens and found the protein was more heavily expressed in the 13 low-grade tumors analyzed.

In the breast cancer experiments, the team first tested overexpression in three breast cancer cell line cultures. Lines treated with PEA-15 developed 30 to 60 percent fewer colonies of cancer cells than did control cultures. Further analysis of one cell line showed that adenovirally delivered PEA-15 overexpression inhibited cell growth and reduced DNA synthesis.

They also found that activated ERK - a protein active in growth, differentiation and mobility of cells that can fuel cancer growth when in the nucleus - was sequestered in the cell's cytoplasm. This is consistent with previous research by Ueno's team that showed PEA-15 works by binding and dragging ERK and phosphorylated ERK from the nucleus, inducing cell death.

Cell cycle analysis indicated the onset of apoptosis - programmed cell death - in breast cancer cells treated with PEA-15. In the case of ovarian cancer, the team found evidence of death by autophagy - cellular self-consumption - rather than apoptosis. The varied forms of cellular death may indicate that the protein's mechanisms differ from one form of cancer to another, Ueno said.

PEA-15 is a versatile protein, serving multiple cellular functions, including glucose metabolism and regulating the tumor necrosis factor (TNF) pathway in addition to its role regulating ERK, Ueno said.

"We are committed to further developing PEA-15 and making it a druggable target," Ueno said. The team is developing a non-gene therapy treatment because adenovirally delivered gene therapies such as those used to overexpress PEA-15 in the mouse experiments have had less success in humans.

Funding for this research was provided by a Susan G. Komen Postdoctoral Fellowship to Bartholomeusz and a National Cancer Institute grant to Ueno.

Co-authors with Bartholomeusz and Ueno are Linda Yuan, Fumiyuki Yamasaki, M.D., Ph.D., Anna Kazansky, Dongwei Zhang, M.D., PhD, Francisco Esteva, M.D., Ph.D., and Gabriel Hortobagyi, M.D., all of M. D. Anderson's Breast Cancer Translational Research Laboratory and the Department of Breast Medical Oncology; and Savithri Krishnamurthy, M.D., of M. D. Anderson's Department of Pathology.

About M. D. Anderson

The University of Texas M. D. Anderson Cancer Center in Houston ranks as one of the world's most respected centers focused on cancer patient care, research, education and prevention. M. D. Anderson is one of only 40 comprehensive cancer centers designated by the National Cancer Institute. For four of the past six years, including 2008, M. D. Anderson has ranked No. 1 in cancer care in "America's Best Hospitals," a survey published annually in U.S. News & World Report.

Scott Merville | EurekAlert!
Further information:
http://www.mdanderson.org

More articles from Life Sciences:

nachricht Topologische Quantenchemie
21.07.2017 | Max-Planck-Institut für Chemische Physik fester Stoffe

nachricht Topological Quantum Chemistry
21.07.2017 | Max-Planck-Institut für Chemische Physik fester Stoffe

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

Stanford researchers develop a new type of soft, growing robot

21.07.2017 | Power and Electrical Engineering

Vortex photons from electrons in circular motion

21.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>