Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Enzyme's second messenger contributes to cell overgrowth

28.09.2007
Scientists at the University of California, San Diego (UCSD) School of Medicine have uncovered a novel pathway by which hormones elevated in inflammation, cancer and cell injury act on cells to stimulate their growth.

The research team led by Joan Heller Brown, Ph.D., professor and chair of the department of pharmacology at UCSD, has demonstrated in a mouse model that a newly discovered subtype of the phospholipase C (PLC) family of enzymes, called PLC-epsilon, has the unique ability to activate a second and distinct signaling pathway that cells require for proliferation. The study is currently on line in advance of publication by the Proceedings of the National Academy of Science (PNAS.)

The studies reported in the PNAS demonstrate that “in the cell, hormones that activate small G proteins are highly dependent on PLC-º to generate second messengers,” said Heller Brown. “In addition, and more surprisingly, we discovered that this enzyme is required for cell growth because it serves a second function when activated by hormones.”

Many intracellular signaling proteins work as molecular “switches.” The reception of a signal activates them and causes them to pass the signal through the cell, after which they can be switched off until another signal is received. G proteins are a commonly used form of switch, activated by the binding of guanine nucleotides. PLC’s normal role is delivering signals from outside the cell to inside the cell by generating “second messengers” that tell cells to contract and secrete. But these signals alone are not enough to cause cells to increase their growth. The first author of the paper, Simona Citro, Ph.D., and colleagues found that PLC-º uniquely activates a second and distinctly different signaling cascade. This second signal catalyzes activation of a Ras family of small G proteins associated with cell growth.

... more about:
»Cell »Messenger »Second »activate

“In combination with the first set of signals, this can lead to cell proliferation and could contribute to inflammation or cancer if left unchecked,” said Citro.

“PLC plays a critical role in physiological processes including heart function, cell secretion and blood pressure control, so one would not normally want to block its activity,” added Heller Brown. The UCSD researchers’ discovery may enable scientists to target this novel PLC isoform or inhibit only its second function, preventing pathological responses while leaving PLC’s critical positive role intact.

Debra Kain | EurekAlert!
Further information:
http://www.ucsd.edu

Further reports about: Cell Messenger Second activate

More articles from Life Sciences:

nachricht The birth of a new protein
20.10.2017 | University of Arizona

nachricht Building New Moss Factories
20.10.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>