Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UF researchers find triggers in cells' transition from colitis to cancer

14.10.2009
University of Florida researchers have grown tumors in mice using cells from inflamed but noncancerous colon tissue taken from human patients, a finding that sheds new light on colon cancer and how it might be prevented.

Scientists observed that cancer stem cells taken from the gastrointestinal system in patients with a chronic digestive disease called ulcerative colitis will transform into cancerous tumors in mice.

The finding, now online and to be featured on the cover of the Thursday (Oct. 15) issue of Cancer Research, may help explain why patients with colitis have up to a 30-fold risk of developing colon cancer compared with people without the disease.

New understanding of the link between colitis and cancer could lead to diagnostic tests that would evaluate tissue taken from patients with colitis for signs of cancer stem cell development, thereby identifying patients who may be at greater risk for cancer.

"Ultimately it would be great if we could prevent colitis or treat colitis so it never gets to the cancerous stage," said UF colorectal surgeon Emina Huang, M.D., who is a member of the Program in Stem Cell Biology and Regenerative Medicine at UF's McKnight Brain Institute and the UF College of Medicine.

Although colonoscopy is very effective in screening and preventing colon cancer for most people, for patients with colitis no diagnostic tests work well because the inflamed tissue makes identification of precancerous changes difficult.

According to the Crohn's and Colitis Foundation of America, approximately 700,000 people have colitis in the United States. The National Cancer Institute estimates that cancer of the colon and rectum will claim the lives of about 50,000 people this year.

UF scientists gathered colitic tissue from humans and chemically screened it for colon cancer stem cells, also called tumor initiating cells. These cells were then isolated and monitored in mice to see if tumors would grow.

Huang said these findings shed light on that fact that it may not be just the cancer "seed" cell, but the "soil" – in this case inflamed colon tissue – that plays a role in the development of cancer.

"Is it the seed, is it the soil or is it their interaction?" she said. "We think probably both, but now we have a new way to look at it and a new method of attack."

B. Mark Evers, M.D., a professor and vice chair of surgery at the University of Kentucky College of Medicine, said the study emphasizes the emerging role of the surrounding inflammatory tumor microenvironment on tumor growth and subsequent metastasis.

"Dr. Huang and her group have identified a potentially important mechanism to explain why long-standing inflammation of the colon predisposes patients to the development of cancer," said Evers, who is director of the Lucille P. Markey Cancer Center in Lexington, Ky.

To further understand the role of the "seed" and "soil" interaction, UF researchers paired colon cancer stem cells with normal, colitic and cancerous human cells taken from the scaffolding layer of the large intestine. The cells were implanted into mice to analyze growth rates. The combination of tumor cells and normal scaffolding tissue cells grew at the slowest rate. Tumor cells paired with cancerous tissue grew at an intermediate rate, and tumor cells paired with the colitic tissue grew at the fastest rate.

Huang said they found heightened levels of two immune system hormones called interleukin-6 and interleukin-8 in the cells from the colitic and cancerous tissues, which had the faster growth rates.

When UF researchers decreased the expression of these hormones within the cells, the tumor growth drastically decreased. When the hormones returned, the tumors began to grow again.

"We don't understand the transition at the molecular level so we are trying to figure out what we can target to interfere, intervene or inhibit that transformation of the benign colitic cells," she said. "The thought is if we can create a therapy to decrease function of these hormones, we may be able to prevent or inhibit cancer growth."

Clinical trials looking at the role of one of these hormones in humans are under way in England, Huang said.

Jennifer Brindise | EurekAlert!
Further information:
http://www.ufl.edu

More articles from Life Sciences:

nachricht Cryo-electron microscopy achieves unprecedented resolution using new computational methods
24.03.2017 | DOE/Lawrence Berkeley National Laboratory

nachricht How cheetahs stay fit and healthy
24.03.2017 | Forschungsverbund Berlin e.V.

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>