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Buy generic acomplia Scientists funded by the Biotechnology and Biological Sciences Research Council (BBSRC) have discovered how evolution may have lumbered humans with allergy problems. The team from the Randall Division of Cell & Molecular Biophysics, King’s College London are working on a molecule vital to a chicken’s immune system which represents the evolutionary ancestor of the human antibodies that cause allergic reactions. Crucially, they have discovered that the chicken molecule behaves quite differently from its human counterpart, which throws light on the origin and cause of allergic reactions in humans and gives hope for new strategies for treatment. The work is published in The Journal of Biological Chemistry.
Researcher, Dr Alex Taylor said: "This molecule is like a living fossil - finding out that it has an ancient past is like turning up a coelacanth in your garden pond. By studying this molecule, we can track the evolution of allergic reactions back to at least 160 million years ago and by looking at the differences between the ancient and the modern antibodies we can begin to understand how to design better drugs to stop allergic reactions in their tracks."
The chicken molecule, an antibody called IgY, looks remarkably similar to the human antibody IgE. IgE is known to be involved in allergic reactions and humans also have a counterpart antibody called IgG that helps to destroy invading viruses and bacteria. Scientists know that both IgE and IgG were present in mammals around 160 million years ago because the corresponding genes are found in the recently published platypus genome. However, in chickens there is no equivalent to IgG and so IgY performs both functions.
Lead researcher, Dr. Rosy Calvert said: "Although these antibodies all started from a common ancestor, for some reason humans have ended up with two rather specialised antibodies, whereas chickens only have one that has a much more general function.
"We know that part of the problem with IgE in humans is that it binds extremely tightly to white blood cells causing an over-reaction of the immune system and so we wanted to find out whether IgY does the same thing."
By examining how tightly IgY binds to white blood cells the researchers have found that it behaves in a much more similar way to the human IgG, which is not involved in allergic reactions and binds much less tightly.
Professor Brian Sutton, head of the laboratory where the work was done said: "It might be that there was a nasty bug or parasite around at the time that meant that humans needed a really dramatic immune response and so there was pressure to evolve a tight binding antibody like IgE. The problem is that now we’ve ended up with an antibody that can tend to be a little over enthusiastic and causes us problems with apparently innocuous substances like pollen and peanuts, which can cause life-threatening allergic conditions."
The next stage of the work is to examine in very fine detail the interaction between the antibodies and the surface of the white blood cell. This is with a view to designing drugs that could alter this interaction and therefore ‘loosen’ the binding of IgE, making it more like its chicken counterpart.
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Article adapted by Medical News Today from original press release.
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Authors:
Dr Rosy Calvert,
Dr. Alex Taylor
Professor Brian Sutton
Notes
This research is published in The Journal of Biological Chemistry: Taylor et al., ‘Avian IgY binds to a monocyte receptor with IgG-like kinetics despite an IgE-like structure’, The Journal of Biological Chemistry, 283: 16384-16390
This research is funded by a ??300K grant from the UK’s Biotechnology and Biological Sciences Research Council (BBSRC).
About BBSRC
The Biotechnology and Biological Sciences Research Council (BBSRC) is the UK funding agency for research in the life sciences. Sponsored by Government, BBSRC annually invests around ??380 million in a wide range of research that makes a significant contribution to the quality of life for UK citizens and supports a number of important industrial stakeholders including the agriculture, food, chemical, healthcare and pharmaceutical sectors.
About King’s College London
King’s College London is one of the top 25 universities in the world (Times Higher 2007) and the fourth oldest in England. A research-led university based in the heart of London, King’s has 19,300 students from more than 130 countries, and 5,000 employees. King’s has an outstanding reputation for providing world-class teaching and cutting-edge research. The College is in the top group of UK universities for research earnings and has an annual income of approximately ??400 million. An investment of ??500 million has been made in the redevelopment of its estate.
King’s has a particularly distinguished reputation in the humanities, law, social sciences, the health sciences, natural sciences and engineering, and has played a major role in many of the advances that have shaped modern life, such as the discovery of the structure of DNA. It is the largest centre for the education of healthcare professionals in Europe and is home to five Medical Research Council Centres - more than any other university.
King’s College London and Guy’s and St Thomas’, King’s College Hospital and South London and Maudsley NHS Foundation Trusts are working together to create the UK’s largest Academic Health Science Centre (AHSC). The AHSC will bring together the widest range of clinical and research expertise in the UK - strengths that will be used to drive improvements in care for patients, allowing them to benefit from breakthroughs in medical science and receive leading edge treatment at the earliest possible opportunity.
For further information visit:
Source: Nancy Mendoza
Biotechnology and Biological Sciences Research Council
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announced results from a new study that showed Ambien CR(R) (zolpidem
tartrate extended-release) CIV tablets 12.5 mg provided significant
improvement in sleep onset, sleep maintenance and total sleep time over 8
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measures. This data was presented at the SLEEP 2008 22nd Annual Meeting of
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The increased beating of the heart that one experiences when in a stressful situation is just one part of the body’s response to stress, something often known as the "fight-or-flight response". Another component of the fight-or-flight response is the suppression of pain, also known as stress-induced analgesia (SIA). Some of the nerves and nerve-produced peptides that are responsible for SIA have been identified, but much remains to be discovered. In a new study, a team of researchers in California, from AfaSci, Inc., Burlingame, and SRI International, Menlo Park, has revealed that nerves producing the peptide N/ORQ and nerves producing the peptide Hcrt are key in regulating SIA in mice.
Generic levitra pills no prescription The research team, which was led by Xinmin Xie and Thomas Kilduff, showed that in the brain of normal mice, Hcrt-producing nerve cells (Hcrt neurons) and N/ORQ-producing nerve cells interacted. N/ORQ affected the electrical current across Hcrt neurons and the release of neurotransmitters by these cells. Furthermore, administration of N/ORQ blocked SIA in normal mice, but this was overcome by administration of Hcrt at the same time. The authors therefore conclude that N/ORQ likely influences a variety of Hcrt-mediated processes, in addition to SIA, and suggest that these pathways might contribute to medical conditions caused by excessive stress, such as anxiety and post-traumatic stress disorder.
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Article adapted by Medical News Today from original press release.
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TITLE: Hypocretin/orexin and nociceptin/orphanin FQ coordinately regulate analgesia in a mouse model of stress-induced analgesia
Author Contact:
Xinmin (Simon) Xie
AfaSci Inc., Burlingame, California, USA.
Thomas S. Kilduff
SRI International, Menlo Park, California, USA.
View the PDF of this article at: https://www.the-jci.org/article.php?id=35115
Source: Karen Honey
Journal of Clinical Investigation
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University of Florida researchers have identified a
gene variation in heart disease patients who appear especially
vulnerable to the physical effects of mental stress - to the point where
blood flow to the heart is greatly reduced.
"Searching for the presence of this gene may be one way to better
identify patients who are at an increased risk for the phenomenon," said
David S. Sheps, M.D., a professor and associate chairman of
cardiovascular medicine at UF’s College of Medicine and the Malcom
Randall Veterans Affairs Medical Center.
Those with the gene variation are three times more likely to experience
dangerous decreases in blood flow to the heart - a condition doctors
call ischemia - than heart disease patients without it. Ischemia
increases the chance these patients will suffer a heart attack, heart
rhythm abnormalities or sudden death, UF researchers report in the April
14 issue of Archives of Internal Medicine.
"There’s no question that in certain populations it is associated with
worse prognosis than in patients who do not have mental stress-induced
ischemia in terms of overall adverse events and also mortality," Sheps
said. "And it has become apparent that it is far more prevalent than we
initially thought. Most of the studies that have been published to date
have involved populations of patients who had coronary disease and
positive exercise stress tests. But recently we and other investigators
have shown that a much broader category of patients also are prone to
mental stress ischemia."
Past studies have shown that as many as two-thirds of patients with
coronary artery disease who experience exercise-related reductions in
blood flow to the heart respond similarly to mental stress. These bouts
often produce no symptoms of chest pain and are rarely detectable on a
standard electrocardiogram. Yet previous UF research has shown that
these patients have a threefold greater risk of dying - as large a risk
factor as cigarette smoking or high cholesterol. Other studies have
linked stress experienced after mass disasters or natural catastrophes
with a rise in heart attacks and sudden death.
Psychological stress can leave the heart more prone to developing
arrhythmias or electrical instability and the blood more prone to
clotting. Stress appears to raise heart rate and rapidly hike blood
pressure, increasing the heart’s need for oxygen-rich blood, Sheps said.
Yet less oxygen is supplied, in part because coronary arteries
constrict, impeding blood flow. Doctors are concerned that this reaction
to stress in the laboratory is simply a snapshot of how patients respond
to the stress of life on a daily basis.
An estimated 10 percent of all patients with coronary disease experience
detectable mental stress-induced reductions in blood flow to the heart.
In some subsets of patients the phenomenon may be even more prevalent,
involving up to 40 percent of these patients.
UF researchers studied 148 patients with coronary artery disease who
were on average about 65 years old. Participants were asked to perform a
public speaking test designed to induce stress. Images were taken of
blood flow to the heart at rest and during the speech task. Blood
samples also were collected and analyzed for five common gene
variations.
About a fourth of the patients experienced mental stress-induced reduced
blood flow to the heart, and about two-thirds of them harbored a
particular variation of the adrenergic beta-1 receptor genotype that was
associated with a three-fold increased risk of this phenomenon, said
Mustafa Hassan, M.D., the study’s lead author and a research fellow in
UF’s division of cardiovascular medicine. This receptor typically helps
the body respond to stress by regulating blood pressure and heart rate,
but a common variability in its gene may make certain patients more
vulnerable to the effects of psychological stress.
The study was funded by the National Heart, Lung and Blood Institute and
also was supported by the Department of Veterans Affairs Medical Center
and the Buy lexapro pills UF colleges of Pharmacy and Dentistry.
Why does mental stress restrict blood flow in some patients even when
exercise fails to have the same effect? The effects of mental stress
could predominantly affect the heart’s smaller vessels, causing them to
spasm and temporarily limiting blood flow, Sheps speculated. In
contrast, exercise tends to affect the heart’s blood supply through
different mechanisms.
"We should focus our research on two areas," he said. "One is better
identification of patients who are prone to have this problem and two is
looking for effective treatments once we know they have it. We need to
know whether we can reverse this phenomenon. We are embarking on other
treatment studies fairly soon."
UF researchers are hunting for other genetic subtypes that could
identify other patients at increased risk, he added.
"One of the advantages of detecting these sorts of things is that we may
be able to in the future be more specific about what kind of treatment
might work better in certain patients depending on their genetic
makeup," Sheps said. "That is one of the important things happening in
many fields of medicine. There are many diseases that already have been
shown to respond differently to different types of treatment based on
genetic differences."
The University of Florida Health Science Center - the most comprehensive
academic health center in the Southeast - is dedicated to high-quality
programs of education, research, patient care and public service. The
Health Science Center encompasses the colleges of Dentistry, Public
Health and Health Professions, Medicine, Nursing, Pharmacy and
Veterinary Medicine, as well as the Veterinary Medical Teaching Hospital
and an academic campus in Jacksonville offering graduate education
programs in dentistry, medicine, nursing and pharmacy. Patient care
activities, under the banner UF&Shands, are provided through teaching
hospitals and a network of clinics in Gainesville and Jacksonville. The
Health Science Center also has a statewide presence through satellite
medical, dental and nursing clinics staffed by UF health professionals;
and affiliations with community-based health-care facilities stretching
from Hialeah and Miami to the Florida Panhandle.
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Americans spent $11 billion on doctors’ bills, prescription drugs, and other medical care to relieve allergy symptoms such as itchy or watery eyes, stuffy noses, wheezing, coughing, and headaches in 2005, according to the latest News and Numbers from the Agency for Healthcare Research and Quality. The cost is nearly double the $6 billion spent in 2000.
AHRQ’s analysis looked at spending on allergies, such as hay fever and other allergies caused plant pollens, dust, or dander such as animal hair.
AHRQ’s data indicated that:
– In 2005, about 22 million Americans reported visiting a doctor, obtaining a prescription drug, being hospitalized, getting home care or experiencing allergy symptoms.
– Visits to doctors’ office and hospital outpatient departments for allergies care accounted for $4 billion. The remaining roughly $7 billion was spent mostly on prescription drugs.
– Between 2000 and 2005, average annual spending on treatment of allergies jumped from $350 per person to $520 per person.
AHRQ, which is part of the U.S. Department of Health and Human Services, works to enhance the quality, safety, efficiency, and effectiveness of health care in the United States. The data in this AHRQ News and Numbers summary are taken from the Medical Expenditure Panel Survey, a detailed source of information on the health services used by Americans, the frequency with which they are used, the cost of those services, and how they are paid.
Buy diflucan without prescription For more information, go to Allergic Rhinitis: Trends in Use and Expenditures, 2000 and 2005 (PDF).

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