Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UC Davis researchers discover receptor pathway for C-reactive protein and its effects

24.06.2005


For the first time, scientists have discovered how C-reactive protein, or CRP, is able to access endothelial cells. The UC Davis researchers’ findings will be published in the July issue of Arteriosclerosis, Thrombosis, and Vascular Biology, one of the American Heart Association’s leading journals.



CRP is a known risk marker for heart disease and, in a study published earlier this year, UC Davis researchers Ishwarlal Jialal and Sridevi Devaraj found that endothelial cells also produce CRP, which is increased 100-fold when cytokines are secreted by human macrophages, a key finding that helps to explain how plaque formation is initiated.

Devaraj and Jialal have now discovered how CRP affects endothelial cells, cells that line the cerebral and coronary arteries, and promotes plaque rupture, leading to heart attacks and strokes. CRP appears to bind to a family of immunoglobulin-processing receptors known as Fc-gamma receptors.


"In this study we convincingly show that CRP binds to two members of the Fc-gamma receptor family, CD64 and CD32, and that by blocking these receptors with specific antibodies, we can reverse the detrimental effects of CRP on endothelial cells," said Jialal, the Robert E. Stowell Chair of Experimental Pathology and director of the Laboratory of Atherosclerosis and Metabolic Research at UC Davis Medical Center.

"This is the first time that anyone has shown how CRP is able to get into the human aortic endothelial cells. Fc-gamma receptors CD32 and CD64 are the culprits," said Sridevi Devaraj, associate professor of pathology at UC Davis School of Medicine and Medical Center.

Work at UC Davis and other institutions has shown that CRP induces endothelial cell dysfunction, thus promoting plaque rupture. CRP causes endothelial cells to produce less nitric oxide and to increase the number of cell adhesion molecules. This, in turn, allows damaging leukocytes to enter the vessels. Devaraj and Jialal also showed, in a previous study, that CRP induces endothelial cells to produce plasminogen activator inhibitor, or PAI-1, which promotes clot formation. In addition, recent studies suggest that plaque tissue also produces CRP.

"In future studies, we will examine the precise pathways by which these receptors are able to mediate CRP effects so that more specific therapies can be developed to target inflammation," said Jialal.

Coronary heart disease is the nation’s single leading cause of death. According to the American Heart Association, approximately 1.2 million Americans will have a coronary attack this year. Almost a half million of these people will die. About 7.1 million Americans have survived a heart attack. And another 6.4 million Americans have experienced chest pain or discomfort due to reduced blood supply to the heart.

Reducing the concentration of CRP with drugs, such as statins, has been shown to reduce cardiovascular events. Treating other risk factors such as smoking, obesity, high blood pressure with angiotensin receptor blockers and diabetes with thiazolidinediones and metformin are also shown to reduce the levels of CRP.

Kelly Gastman | EurekAlert!
Further information:
http://www.ucdmc.ucdavis.edu

More articles from Life Sciences:

nachricht Decoding the genome's cryptic language
27.02.2017 | University of California - San Diego

nachricht New risk factors for anxiety disorders
24.02.2017 | Julius-Maximilians-Universität Würzburg

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Safe glide at total engine failure with ELA-inside

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded after a glide flight with an Airbus A320 in ditching on the Hudson River. All 155 people on board were saved.

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded...

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

New pop-up strategy inspired by cuts, not folds

27.02.2017 | Materials Sciences

Sandia uses confined nanoparticles to improve hydrogen storage materials performance

27.02.2017 | Interdisciplinary Research

Decoding the genome's cryptic language

27.02.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>