Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Blocking receptor in key hormone fires up enzyme to kill pancreatic cancer cells

11.08.2011
Thomas Jefferson University research suggests a potential target—Angiotensin II type 2 receptor—for chemopreventive agents to fight pancreatic cancer

Pancreatic cancer researchers at Thomas Jefferson University have shown, for the first time, that blocking a receptor of a key hormone in the renin-angiotensin system (RAS) reduces cancer cell growth by activating the enzyme AMPK to inhibit fatty acid synthase, the ingredients to support cell division.

With that, a new chemopreventive agent that inhibits the angiotensin II type 2 receptor—never before thought to play a role in tumor growth—could be developed to help treat one of the fastest-moving cancers that has a 5-year survival rate of only 5 percent.

Hwyda Arafat, M.D., Ph.D., associate professor of Surgery at Jefferson Medical College of Thomas Jefferson University and the co-director of the Jefferson Pancreatic, Biliary and Related Cancers Center, and her fellow researchers, including the chair of the Department of Surgery at Jefferson, Charles J. Yeo, M.D., FACS, present their findings in the August issue of Surgery.

Angiotensin II (AngII) is the principal hormone in the RAS that regulates our blood pressure and water balance; it has two receptors: type 1 and type 2. AngII is also generated actively in the pancreas and has been shown to be involved in tumor angiogenesis.

Previous studies have pointed to the hormone's type 1 receptor as the culprit in cancer cell proliferation and tumor inflammation; however, the idea that type 2 had any effect was never entertained.

By looking at pancreatic ductal adenocarcinoma (PDA) cells in vitro, Jefferson researchers discovered that the type 2 receptor, not just type 1, mediates the production of fatty acid synthase (FAS), which has been shown to supply the cell wall ingredients necessary for cancer cells to multiply.

FAS was previously identified as a possible oncogene in the 1980s. It is up-regulated in breast cancers and is indicator of poor prognosis, and thus believed to be a worthwhile chemopreventive target.

"AngII is not just involved in cell inflammation and angiogenesis; it's involved in tumor metabolism as well," said Dr. Arafat, a member of the Kimmel Cancer Center at Jefferson. "It promotes FAS with both receptors, which makes the tumor grow."

"Blocking the type 2 receptor reduces PDA cell growth with the activation of AMPK, revealing a new mechanism by which chemoprevention can exploit," she added. "In fact, maybe combined blocking of the two receptors would be more efficient than just blocking one receptor."

AMPK, or adenosine monophosphate-activated protein kinase, is the focus of several agents today, including ones for diabetes and related metabolic diseases. It is a master metabolic regulator for cells that is activated in times of reduced energy availability, like starvation. Activation of AMPK has been shown to improve energy homeostasis, lipid profile and blood pressure. The enzyme also activates a well-known tumor suppressor, p53.

"The main thing is activation of AMPK in tumor cells," said Dr. Arafat. "AMPK is the perfect candidate as it regulates multiple targets that both halt tumor cell division and activate programmed cell death. Although it is yet to be determined how the type 2 receptor imposes deregulation of AMPK activity, identification of the type 2 receptor as a novel target for therapy is very exciting"

Next, Dr. Arafat and fellow researchers are proposing to take this research into animal studies. They hope to target the receptors early on in the disease to better understand its prevention capabilities and also study its treatment potential. Considering pancreatic cancer is typically detected in later stages, finding better ways to treat cases that have progressed further along would be of great benefit to patients.

Thomas Jefferson University, the largest freestanding academic medical center in Philadelphia, is composed of Jefferson Medical College, Jefferson College of Graduate Studies, Jefferson School of Population Health, Jefferson School of Health Professions, Jefferson School of Pharmacy, and Jefferson School of Nursing. Jefferson is regarded nationally as one of the best universities offering a range of comprehensive programs for the education of health professions. Thomas Jefferson University partners with Thomas Jefferson University Hospital, its education and clinical care affiliate.

Steve Graff | EurekAlert!
Further information:
http://www.jefferson.edu

More articles from Life Sciences:

nachricht Not of Divided Mind
19.01.2017 | Hertie-Institut für klinische Hirnforschung (HIH)

nachricht CRISPR meets single-cell sequencing in new screening method
19.01.2017 | CeMM Forschungszentrum für Molekulare Medizin der Österreichischen Akademie der Wissenschaften

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland

19.01.2017 | Earth Sciences

Not of Divided Mind

19.01.2017 | Life Sciences

Molecule flash mob

19.01.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>