Archive for May, 2010
New examination from UT Southwestern Medical Center suggests that allergic reactions to caress dander, dust mites and mold may intercept people by allergic asthma from generating a of a sound constitution immune response to respiratory viruses of the like kind as influenza.
“Our findings imply that the better your asthma is controlled, the more likely you are to have an appropriate replication to a venom,” said Dr. Michelle Gill, co-aid professor of pediatrics and internal medicine at UT Southwestern and lead author of the study appearing online and in the June edition of The Journal of Immunology. “When individuals through asthma come in contact through an allergic trigger and a respiratory virus, the allergen may actually interfere with the immune response to the virus. This intermission in the antiviral response may grant to exacerbations of asthma that are commonly associated through respiratory viral infections.”
More than half of the 20 million people diagnosed by asthma in the U.S., including 2.5 million children, have been diagnosed through allergic asthma.
Fifty-six people ranging in age from 3 to 35 participated in the study. Twenty-six of the participants suffered from allergic asthma; the remaining 30 made up the ascendency group. Most of the participants were African-American, and the mean age was 15 years in as well-as; not only-but also; not only-but; not alone-but the asthma and control groups. In addition, those in the asthma collection had been diagnosed by a healer and had a actual skin test to at least one indoor allergen.
Researchers in the beginning detached immune cells called dendritic cells from study participants. These cells are found in royal line and tissues that are in contact through the environment, such as derm and the linings of the nose and lungs. When they contest respiratory viruses such as flu, dendritic cells normally produce proteins that help the body mobilize the immune system and overcome the viral infection. When the dendritic cells first encounter an allergic stimulus, howsoever, they are significantly impaired in their ability to produce such antiviral proteins.
When investigators exposed the dendritic cells from the study participants with allergic asthma to influenza, they raise that the cells were incompetent to produce interferon, common immune method protein that plays a lock opener role in fighting over repeated infections of the similar venom. Interferon is what makes a person feel run in a descending course and tired when warring viral infections.
The researchers speculate that the immune-suppressing effect of the allergic stimulation of dendritic cells might have being related to the high levels of a atom called IgE normally mould in people by allergic asthma. Among the subjects participating in this revolve in the mind, elevated IgE levels were associated through impaired capacity of dendritic cells to bring interferon at what time exposed to flu.
Dr. Gill uttered these tools and materials suggest that when the devoid of warmth/flu and allergy seasons collide, the immune response in individuals with allergic asthma may worsen their disease.
“These findings import that allergic triggers associated with exposing. to indoor allergens like pet dander and dust mites have power to potentially render cells deficient in responding to a virus,” Dr. Gill said. “It may – although this remains to be proven – also explain why asthmatics who are sensitive to indoor allergens often experience asthma exacerbations at the time they acquire respiratory viral infections.”
The findings from this cogitation prompted some upcoming mechanistic study of dendritic cells as part of the Inner City Asthma Consortium (ICAC), that receives funding through the National Institute of Allergy and Infectious Diseases. The dendritic cell component of the ICAC study will investigate whether a treatment to lower IgE in allergic asthma patients will be enhanced dendritic cells’ response to allergens and respiratory viruses. UT Southwestern is among 10 institutions involved in the ICAC, what one. is administered by the agency of the University of Wisconsin-Madison.
Other UT Southwestern researchers involved in the ponder were Gagan Bajwa, examination associate in pediatrics; Tiffany George, prior clinical premises specialist; Dr. Caroline Dong, research partner in interior medicine; Irene Dougherty, research associate in dermatology; Nan Jiang, examination associate in in the mind medicine; Dr. Vanthaya Gan, professor of pediatrics; and senior author Dr. Rebecca Gruchalla, professor of internal medicine and pediatrics.
The study was funded primarily by a grant from the Exxon Mobil Corp.
Visit http://www.utsouthwestern.org/allergy to learn more not far from UT Southwestern’sitting clinical services for asthma and allergies.
Source: UT Southwestern Medical Center
Copyright: Medical News Today
Not to be reproduced without permission of Medical News Today
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Scientists are reporting development of a fast, uncombined, inexpensive means for determining whether chemicals in consumer products and workplaces may undertaking skin allergies in people — a method that does not embrace use of animals. Their study appears in ACS’ Chemical Research in Toxicology, a monthly journal.
Itai Chipinda and his colleagues report the existence of the people sentiment against the appliance of animals to determine whether ingredients in consumer soaps, shampoos and other consumer products, and workplace chemicals, may efficient cause skin sensitization and contact dermatitis. Chemicals cause dermatitis by the agency of bonding to proteins in the skin, and then aggravating the immune a whole in the same state that redness, irritation, itching, and other symptoms occur. Existing chemical tests use substances like glutathione that imitative skin proteins and bond to allergy-causing ingredients. None, yet, are suitable for use in detecting the critical betimes stages of hide sensitization, the scientists say.
Instead of glutathione, Chipinda and his team developed a test through nitrobenzenethiol as the skin protein surrogate. When used on 20 different chemicals known to cause hide inflammation, the test produced positive results. It produced negative results then used to test substances that usually do not produce skin sensitization. “This simple, hasty and inexpensive absorbance-based method has great potential on the side of use viewed like a introduction screening instrument notwithstanding skin allergens,” the recital states.
Article: “Rapid and Simple Kinetics Screening Assay for Electrophilic Dermal Sensitizers Using Nitrobenzenethiol”
Source:
Michael Bernstein
American Chemical Society
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The place of traffic is saturated with low-fat, low-carb and sugar-free foods. But notwithstanding the popular diets, “magical” pills and the latest, greatest preparation machines that everything promise to melt away the pounds, more than half of American adults are overweight.
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University of Virginia Professor of Medicine Thomas Platts-Mills, MD, PhD, has achieved the inimitable distinction of conscious elected a Fellow of the Royal Society for his research into the causes of asthma and allergic disease. The Royal Society is the United Kingdom’s National Academy of Science and the oldest scientific academy in the nature.
Only a small sum up of Fellows are physicians, and Dr. Platts-Mills is the first ever allergist to be elected. His discrimination was based on more than 30 years of study on the role that dust atom, cat and cockroach allergens flutter in the progressive growth of allergic disease and asthma. His modern toil, published in the New England Journal of Medicine in 2008, looked at patients who developed a life threatening allergic rebound, called anaphylaxis, during management on the side of cancer. In February 2009, he led a consideration on anaphylactic reactions that occurred several hours after corroding beef, swine-flesh or lamb. Both of these discoveries are related to IgE antibodies to a complex mammalian sugar that appear to be induced by tick bites. This represents a paradigm shift in the understanding of allergic reactions, including those to food.
Source: University of Virginia Health System
About 30 percent of Americans believe they desire food allergies. However, the actual number is far smaller, closer to 5 percent, according to a recent study commissioned by the National Institute of Allergy and Infectious Diseases (NIAID). That’sitting due in large part to the unreliability of the skin test that doctors commonly use to test for regimen allergies.
MIT chemical engineer Christopher Love believes he has a better way to diagnose of the like kind allergies. His new technology, described in the June 7 sending out of the journal Lab on a Chip, can analyze unique immune cells taken from patients, allowing for precise measurement of the cells’ response to allergens such as milk and peanuts.
Using this technology, doctors could one age diagnose food allergies by a simple blood test that would be faster and more reliable than tide tests, says Love, an assistant professor of chemical engineering. “With a copious number of diagnoses, it’s ambiguous,” he says. “A doom of times it’s almost circumstantial whether you’re allergic to one thing or another.”
The NIAID study, published May 12 in the Journal of the American Medical Association, found that in the United States, 6 to 8 percent of children in a state of being liable to four, and 4 percent of people five or older, have at least one food allergy. Milk, peanuts, eggs and soy are amidst the greatest in quantity common allergens.
Food allergies occur what one. time the material substance’s immune system mistakes a protein in food for something harmful. This triggers an allergic answer that be able to include rashes, hives, up-hill work wish or gastrointestinal distress. Some allergies can arouse life-threatening anaphylactic shock, which requires immediate treatment.
Patients suspected of having food allergies usually be exposed to a skin test, what one. involves placing small quantities of in posse allergens under the derm of the patient’session arm. If the patient’s blood has antibodies specific to that allergen, immune cells will remit histamines that final cause itching and redness in the make spots on to which place the allergen was placed.
Doctors can in like manner perform feelings tests that expressly judge of the port of scrupulous antibodies in the patients’ high birth. However, one fault to both of these tests is that the demeanor of antibodies to a personal allergen does not indispensably mean that the patient is allergic to that body, leading to improper positive results.
Love’sitting new technology, developed with funding from the Deshpande Center because of Technological Innovation, the Dana Foundation and the NIAID, takes a different approach. Instead of detecting antibodies, his system screens the quiet’s immune cells as far as concerns small proteins known as cytokines. Immune cells in the same state like T cells effect cytokines when every allergic response is initiated, attracting other cells to join in the response.
To perform the test, blood must have existence drawn from the patient, and white spirit cells (that include T cells) are isolated from the sample.
The cells are exposed to a potential allergen and hereafter placed into in various places 100,000 individual wells arranged in a lattice pattern on a soft rubber surface. Using a technique known in the same manner with microengraving, the researchers make ready “prints” of the cytokines produced by dint of. each enclosed space onto the surface of a glass slide. The amount of cytokine secreted by each peculiar to undivided alone cell be able to be precisely measured. For food-allergy testing, the cytokines of most interest are IL4, IL5 and IL9.
The “gold standard” against diagnosing a victuals allergy is to see what happens while the patient is given the food in question (in a controlled setting, to render certain safety), but that is not often done exterior of allergy scrutiny clinics, says Assa’ad.
Love is at that time moving through Dale Umetsu, professor of pediatric immunology at Children’s Hospital Boston, on a throw out they hope be disposed pinpoint the relationship betwixt cytokine activity and allergic reactions. In that ponder, children with milk allergies are being given small amounts of milk to desensitize their immune systems to the milk. Using the new technology, the team is tracking how the responses of the patients’ cells change as the patients undergo treatment.
Written by Anne Trafton, MIT News Office
Source:Massachusetts Institute of Technology
Copyright: Medical News Today
Not to exist reproduced without permit of Medical News Today
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A plain blood discriminative characteristic can now portend whether newborn babies are at high risk of developing allergies for example they grow older, thanks to research involving the University of Adelaide.
Professor Tony Ferrante, an immunologist from SA Pathology and the Children’s Research Centre at the University of Adelaide, says the new marker may be the most important breakthrough in allergy testing for some decades.
“A protein in the immune cells of newborns appears to hold the answer in favor of example to whether a infant. force of will either be protected, or sensitive to the development of allergies later in succession,” Professor Ferrante says.
Amounts of the cell signalling protein, called protein kinase C zeta, are abundant lower in children at danger of allergies.
Professor Ferrante says the blade proof is far greater degree effective than previous indicators, in the same state as a family’s clinical history, or measuring the allergy-inducing antibody IgE.
In collaboration with Professor Susan Prescott from the University of Western Australia and Princess Margaret Hospital for Children, Professor Ferrante’sitting research team has civilized the recent marker for allergy exposure to harm, originally discovered in 2007, but now modified to a simple and manageable blood touchstone at beginning.
The researchers are also looking at whether seek by indirection oil supplements given to the pair pregnant women and those who have just given birth can master the risks of the children developing allergies.
“There is evidence that the levels of this important protein be augmented with hint after oil supplementation to protect adverse to allergy development,” Professor Ferrante says.
Australia has one of the highest allergy rates in the creation, with 40% of children now suffering from allergic diseases, including provisions allergies, eczema, asthma and hay fever. These conditions frequently persist into adulthood, placing a heavy burden on the healthcare system.
According to the World Allergy Organization, there is a worldwide epidemic of allergic diseases that is likely to be a consequence of the changing environment and improved general health, superimposed on a range of genetic susceptibilities.
The studies and clinical trials have been funded by the Channel 7 Children’session Research Foundation and the National Health and Medical Research Council.
Professor Ferrante is SA Pathology’sitting Head of Immunology at its Women’s and Children’sitting Hospital campus and Professor in the School of Paediatrics and Reproductive Health at the University of Adelaide. He has been a leader in his department for more than 20 years and leads the Developmental and Genetic Immunology Program of the University’sitting Children Research Centre.
Source: University of Adelaide
Copyright: Medical News Today
Not to be reproduced without warrant of Medical News Today
In recognition of National Allergy and Asthma Awareness Month, celebrated each May, the National Pest Management Association (NPMA) is reminding families that cockroach allergens can trigger allergies and asthma attacks. The saliva, droppings and decomposing bodies of cockroaches restrain allergen proteins known to trigger allergies and increase the niceness of asthma symptoms, especially in children.
“When greatest number people think of allergy and asthma triggers, they probably do not think of cockroaches,” says Missy Henriksen, vice president of public affairs for the NPMA. “But homes, schools and other buildings that consider cockroach infestations can artificial position a serious health threat to those that suffer from allergies and asthma. Cockroach allergens tend to amass in areas that are not easily seen, like under appliances and sinks, for a like reason keeping these areas clean is elucidation.”
In addition to triggering allergies and asthma, cockroaches are known to spread 33 contrasted kinds of bacteria, six parasitic worms and at least seven other kinds of human pathogens. As cockroaches creep end decaying body or sewage, they change into disease-carrying pests by picking up germs upon the body the spines of their legs and bodies. These germs can then have being transferred to humans on unyielding surfaces and through provender contamination.
The NPMA recommends these tips to help prevent cockroach infestations:
– Seal cracks encircling the outside of the home to prevent plague entryways.
– Vacuum frequently and dispose of garbage regularly.
– Keep counters and floors purify and free of crumbs that captivate pests. Pay additional attention to kitchens and bathrooms – especially under appointments and sinks – as these areas are particularly vulnerable to cockroach infestations due to the vicinity of food products and moisture in plummery fixtures.
– If you guess you have an infestation, contact a licensed pest professional to take for identical the variety and commit a course of method of treating.
To be informed of more about cockroaches and the health threats they confound, or to find a licensed pest professional, examine http://www.pestworld.org
Source
National Pest Management Association