Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UVa Researchers Demonstrate Value for the First Genetic Test for High Blood Pressure and Sensitivity to Salt

23.02.2006


Researchers led by UVa Health System pathologist Robin Felder, Ph.D., have demonstrated that looking for several variations of genes that control blood pressure can predict the risk for high blood pressure caused by high levels of salt. Once it is fully developed, this effective diagnostic test will be the first of its kind, says Dr. Felder, whose work will be published in the Feb. 23 issue of the journal Clinical Chemistry. When a subject had three or more variations in these genes, the new genetic test correctly predicted risk for salt-induced high blood pressure in 94 percent of cases. Health is adversely affected by high salt intake in up to half of Americans.



In a separate finding, two genes at most were necessary to predict with a 78 percent accuracy which people with high blood pressure (hypertension) had a low renin levels, a substance that is currently measured to help establish the diagnosis of salt (sodium chloride) sensitivity. Thus, the researchers found different genetic bases for low renin in the blood and for salt sensitivity. Salt sensitivity is defined as a greater than 10 percent increase in blood pressure following a high-salt meal.

The researchers also determined that the increase in subjects’ blood pressure and inability to eliminate excess salt from their systems was directly related to how many variations were found in the participants’ salt regulating genes, a phenomenon called a gene dosing effect. The more gene variants, the bigger the health problems.


"A genetic test for high blood pressure and/or salt sensitivity will be instrumental in motivating Americans to adopt heart healthy lifestyles and help to improve their overall health and quality of life," Dr. Felder said. "In addition, because the treatment of hypertension costs the U.S. health system more than $13 billion per year, this test could result in significant cost savings as well."

"Diagnostic genetic tests with this high level of predictive value for hypertension simply don’t exist at this time," said Dr. Hironobu Sanada, M.D., Ph.D., Fukushima Medical University , who led the clinical trials of the diagnostic genetic panel with Japanese subjects. Dr. Sanada is a former UVa pathology fellow who studied and worked with Dr. Felder.

Performing extended studies among people with different ethnic origins, the research group hopes to demonstrate the effectiveness of this test in particular among African Americans, who have a higher incidence of salt-sensitive hypertension than other races. While 98 million Americans suffer from either high blood pressure or sensitivity to dietary salt (or both), until now no genetic test had been created that could predict who may develop these diseases. Salt sensitivity, with or without high blood pressure, has the same deleterious consequences as high blood pressure. Left undiagnosed, high blood pressure and/or salt sensitivity can lead to devastating consequences such as stroke, blindness, heart attack and kidney failure.

The studies were conducted by a team of collaborators including Pedro A. Jose, M.D., Ph.D., at Georgetown University School of Medicine (Washington D.C. ), Hironobu Sanada, M.D., Ph.D., Fukushima Medical University (Fukushima , Japan ), and Scott Williams, Ph.D., Vanderbilt University (Nashville , TN ). Funding for these studies was provided in part by a $10.2 million grant from the National Heart, Lung and Blood Institute.

The grant will allow this group of collaborating investigators, including Dr. Robert M. Carey, M.D. (University of Virginia ) to extend their studies on the genetic bases for high blood pressure and salt sensitivity and their mechanisms in subjects from many different ethnic backgrounds, which could influence the predictive value of the diagnostic test. The team’s work will examine the normal mechanisms associated with sodium (salt) management by the kidney and how the failure of these mechanisms contributes to high blood pressure.

Dr. Carey will recruit an additional 3,000 volunteers who will receive genetic screens to identify gene variants that contribute to elevated blood pressure. Dr. Jose’s research will determine how dopamine receptors and angiotensin II receptors regulate each other. The information from these studies will provide new insights into how hypertension develops, how it can be tested and how it can be treated.

Right now, no definitive diagnostic test exists for salt sensitivity, except for a protocol in which diet is controlled rigorously over a two-week period. "Through these grant funds, we wish to stimulate broader research in the area of cardiovascular disease, hypertension and salt sensitivity," said Dr. Felder. "It’s important because cardiovascular diseases, including stroke, account for more disability and death than the next top five causes combined."

Mary Jane Gore | EurekAlert!
Further information:
http://www.virginia.edu

More articles from Life Sciences:

nachricht Bolstering fat cells offers potential new leukemia treatment
17.10.2017 | McMaster University

nachricht Ocean atmosphere rife with microbes
17.10.2017 | King Abdullah University of Science & Technology (KAUST)

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

Ocean atmosphere rife with microbes

17.10.2017 | Life Sciences

Neutrons observe vitamin B6-dependent enzyme activity useful for drug development

17.10.2017 | Life Sciences

NASA finds newly formed tropical storm lan over open waters

17.10.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>