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A simple, noninvasive test measures survival time in adult pulmonary hypertension

11-01-2006 · EurekAlert!

Researchers have developed a simple, noninvasive way to measure right ventricular function in the heart to predict survival of adults who suffer from pulmonary hypertension.The research appears in the first issue for November 2006 of the American Journal of Respiratory and Critical Care Medicine, published by the American Thoracic Society.

Keywords: simple, noninvasive, test, measures, survival, time, adult, pulmonary, hypertension, measure

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Advance in understanding of blood pressure gene could lead to new treatments
02-04-2007 · EurekAlert!
Research by scientists at UCL (University College London) has clearly demonstrated for the first time the structure and function of a gene crucial to the regulation of blood pressure. The discovery could be important in the search for new treatments for illnesses such as heart disease, the UK's biggest killer. In a paper published online today in Nature Medicine, the team, led by Professor Patrick Vallance and Dr James Leiper, UCL Department of Medicine, reveal the role of the human gene dimethylarginine dimethylaminohydrolase (DDAH), showing that loss of DDAH activity disrupts nitric oxide (NO) production. NO is critical in the regulation of blood pressure, nervous system functions and the immune system. The role of DDAH is to break down modified amino acids (Asymmetric dimethylarginine (ADMA) and monomethyl arginine (L-NMMA)) that are produced by the body and have been shown to inhibit NO synthase. These molecules accumulate in various disease states including diabetes, renal failure and pulmonary and systemic hypertension, and their concentration in plasma (the fluid component of blood) is strongly predicative of cardiovascular disease and death. In a healthy human body, the majority of ADMA is eliminated through active metabolism by DDAH. Scientists have hypothesised that if DDAH function is impaired, NO production is reduced, and that this could be an important feature of increased cardiovascular risk. To examine this pathway in more detail, the researchers deleted the DDAH gene in mice. These mice went on to develop hypertension, or high blood pressure. They also designed specific inhibitors (small molecules) which bind to the active site of human DDAH. These small molecule inhibitors also induced hypertension in mice, confirming the importance of DDAH in the regulation of blood pressure. Dr Leiper, UCL Medicine, said: “These genetic and chemical approaches to disrupt DDAH showed remarkably consistent results, and provide compelling evidence that loss of DDAH function increases the concentration of ADMA and thereby disrupts vascular NO signalling. “There has been considerable scientific interest in this pathway and the role of ADMA as a novel risk factor, but so far there's been little evidence to support the idea that it's a cause of disease, rather than just a marker. Genes and their pathways are crucial to our understanding of cardiovascular disease and a better understanding of DDAH-1 could lead to important new treatments. “It could help us to establish if genetic variation predisposes certain people to these diseases, or whether environmental factors exert some of their effects through modulation of DDAH activity. “Our research also shows that this pathway could be harnessed therapeutically to limit production of NO in certain situations where too much nitric oxide is a bad thing; for example, hypotension and septic shock. These are some of the biggest problems in intensive care medicine and there is a huge unmet need for drug treatments.” The study, which was carried out at UCL's Rayne Institute, was funded by grants from the British Heart Foundation, the Wellcome Trust and the Medical Research Council. Professor Jeremy Pearson, Associate Medical Director of the British Heart Foundation, said: "The unexpected finding in the 1980s that a simple gas, nitric oxide (NO), is made by cells in the blood vessel wall and is a powerful control of blood vessel relaxation led to the award of the Nobel Prize in 1998 to its discoverers. "More recently, there has been increasing evidence that impairment of NO production is likely to be an important factor in the development of heart and circulatory disease, but the mechanisms responsible are not fully understood. "This study suggests for the first time that the loss of the activity of the enzyme DDAH-1 leads to reduced NO production and may cause heart and circulatory disease. These findings are likely to be important in the search for new ways to optimise the health of our blood vessels." ### Notes for Editors 1. For more information, please contact Ruth Metcalfe in the UCL Media Relations Office on tel: +44 (0)20 7679 9739, mobile: +44 (0)7990 675 947, out of hours: +44 (0)7917 271 364, e-mail: r.metcalfe@ucl.ac.uk2. 'Disruption of methylarginine metabolism impairs vascular homeostasis' is published in the February issue of the journal Nature Medicine. Advance online publication is embargoed to 18.00 GMT (13.00 US Eastern) Sunday 4 February 2007. Journalists can obtain copies of the paper by contacting the UCL Media Relations Office.3. The study was funded by the British Heart Foundation, the Wellcome Trust and the Medical Research Council. About UCL Founded in 1826, UCL was the first English university established after Oxford and Cambridge, the first to admit students regardless of race, class, religion or gender, and the first to provide systematic teaching of law, architecture and medicine. In the government's most recent Research Assessment Exercise, 59 UCL departments achieved top ratings of 5* and 5, indicating research quality of international excellence. UCL is the fourth-ranked UK university in the 2006 league table of the top 500 world universities produced by the Shanghai Jiao Tong University. UCL alumni include Mahatma Gandhi (Laws 1889, Indian political and spiritual leader); Jonathan Dimbleby (Philosophy 1969, writer and television presenter); Junichiro Koizumi (Economics 1969, Prime Minister of Japan); Lord Woolf (Laws 1954, Lord Chief Justice of England & Wales); Alexander Graham Bell (Phonetics 1860s, inventor of the telephone), and members of the band Coldplay.
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First Non-invasive Test To Measure Skin Aging; Results Suggest Women's Skin Ages Faster Than Men's
10-05-2006 · ScienceDaily
Physicists and medical researchers for the first time have demonstrated a new technique that non-invasively measures in real time the level of damage to the skin from sun exposure and aging, and initial results suggest that women's skin ages faster than men's. Findings appear in the October 1 issue of Optics Letters, a journal of the Optical Society of America.
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Charting ever-changing genomes
07-19-2007 · EurekAlert!
Instead of immutable proprietary software, any species' genetic information resembles open source code that is constantly tweaked and optimized to meet the users' specific needs. But which parts of the code have withstood the test of time and which parts have undergone rapid evolutionary change has been difficult to assess. An international collaboration of researchers developed a simple method to comb whole genomes for all the software fixes and security patches accumulated over time.
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Study shows strong link between uric acid and hypertension in Blacks
11-02-2006 · EurekAlert!
New research shows that higher levels of uric acid are strongly associated with high blood pressure in blacks, suggesting that a simple blood test could predict risk and that treatments to lower uric acid may be a novel way to reduce hypertension-related complications in this population.
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Lymphocyte count found to be a predictor of survival for young patients with leukemia
05-07-2007 · EurekAlert!
One simple blood test could predict relapse or survival for children and young adults with acute leukemias, researchers from the Children's Cancer Hospital at the University of Texas M. D. Anderson Cancer Center reported at the American Society of Pediatric Hematology Oncology's annual meeting.
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High-normal uric acid linked with mild cognitive impairment in the elderly
01-01-2007 · EurekAlert!
Researchers at the Johns Hopkins and Yale university medical schools have found that a simple blood test to measure uric acid, a measure of kidney function, might reveal a risk factor for cognitive problems in old age. Of 96 community-dwelling adults aged 60 to 92 years, those with uric-acid levels at the high end of the normal range had the lowest scores on tests of mental processing speed, verbal memory and working memory.
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Leveling The Field For Babies With Persistent Pulmonary Hypertension
10-07-2006 · ScienceDaily
If he can figure out which babies will be born unable to breathe properly, Dr. Stephen M. Black thinks he can help change that. "When these kids are born, you have a short amount of time to intervene or you get brain damage," says Dr. Black, cell and molecular physiologist at the Medical College of Georgia Vascular Biology Center.
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Testing strengthens recall whether something's on the test or not
11-12-2006 · EurekAlert!
New research reveals that the simple act of taking a test helps you remember everything you learned, even if it isn't tested. In three experiments, psychologists at Washington University in St. Louis determined that testing enhanced long-term recall for material that was not tested initially. Untested students recalled significantly less of what they'd studied -- even after having extra time to go over the material.
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Rush researchers participate in Worldwide AIDS initiative led by Imperial College London
04-02-2007 · EurekAlert!
Researchers at Rush University Medical Center have been selected to participate in a collaborative initiative to develop a simple, affordable and rapid test to measure the immune systems of people infected with HIV/AIDS in developing countries. The four year CD4 Initiative is conducted under the leadership of Imperial College London with funding from the Bill & Melinda Gates Foundation.
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Scientists clone mice from adult skin stem cells
02-12-2007 · EurekAlert!
Using a nuclear transfer procedure, scientists at Rockefeller University and the Howard Hughes Medical Institute have, for the first time, shown reproducibly that mice can be cloned from adult stem cells.
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