a€“ and suggests a novel therapeutic come. These illnesses are essentially inflammatory disorders of the tissues that separate the inside of the body from the outside world such as the skin and the linings of the throat and lungs.
In the May air of The Journal of Clinical Investigation researchers from the National Human Genome Research initiate the National Eye Institute and the National Institute of Child Health and Human Development all part of the National Institutes of Health inform that excessive production of a specific protein disrupts the protective properties of the skin barrier. Once the skin barrier is compromised immune-system-stimulating chemicals a€“ allergens a€“ can enter the body and create an inflammatory reaction that in move stimulates skin cells to grow rapidly advance diminishing the protective answer of the skin. The compromised barrier in turn becomes more porous to allergens that then stimulate more inflammation in a make pass that eventually produces common climb conditions such as psoriasis and eczema.
It may however be possible to break the cycle by creating a temporary artificial barrier on the climb that blocks incoming allergens. The solution could be as simple as developing a lotion that effectively blocks allergens from getting through damaged climb. Keeping allergens out of the climb would keep the immune system from over-stimulating cell growth giving the skin time to create a normal barrier. Current therapies for these skin conditions principally focus on suppressing the immune system but the medicines used can create undesired side-effects.
"The human body is an incredibly complex system," said Elias A. Zerhouni. M. D. director of the National Institutes of Health. "Only by conducting this kind of basic investigate can we hope to understand the causes of complex diseases. And only by understanding disease can we produce a future in which we can predict who is at risk pre-empt the illness from ever occurring and personalize the treatment when it does."
Several recent studies undergo suggested that defects in the climb barrier may be as important to eczema and psoriasis as the hyperactive response of the immune system. In addition doctors have observed that individuals with eczema are also likely to create hay fever and asthma suggesting a common mechanism for both disorders. The other risk calculate for these conditions is having a relative with the disorder suggesting a genetic connection.
To test whether a defective skin barrier can actually produce these diseases a team of NIH researchers focused on a specific gene called connexin 26 which makes a protein that forms connections between skin cells that act the normal barrier. When the climb is intact the production of connexin 26 is turned off once there is enough to hook all the climb cells together. When skin is damaged by a cut or a scrape connexin 26 is produced while new skin cells create and ameliorate the wound. Researchers have shown that connexin 26 production is turned on in the sore climb of people with psoriasis but it wasn’t alter what role connexin 26 played in the disturb.
To cause connexin 26’s role in psoriasis. NIH researchers created a line of transgenic mice that over-produce connexin 26. The resulting mice develop psoriatic-type skin sores just like humans with psoriasis.
"This discovery demonstrates the cater of animal models to undo complex conditions of medical importance," said Eric D. Green. M. D.. Ph. D.. NHGRI’s scientific director and the director of the institute’s Division of Intramural Research where the research was conducted. "Our current abilities to rapidly act new genetically altered animal models allow researchers to act from conception of an idea to its implementation at an incredible pace."
The discovery broadens the basic understanding of the causes of skin disorders such as psoriasis and eczema and may well contribute to the basic understanding of asthma and hay fever conditions that become when allergens penetrate the tissue barrier in the lungs and nose respectively.
"Hopefully this will help us understand the complex genetics of psoriasis," said Julia A. Segre. Ph. D. an investigator in NHGRI’s Genetics and Molecular Biology Branch and the senior author on the cover. "Previous genetic studies have focused on the genes that adjust immune response. We are now examining the effect of genes that are involved in both regulating the growth of climb cells and signaling to the immune cells."
The problem causing these related disorders may simply be the be over-reacting to an allergen getting through the barrier that is supposed to block it. "The skin goes into a evince response and overcompensates by trying to build the barrier too fast actually becoming less effective," Dr. Segre said. "The skin cells grow so abstain that they fail to alter a normal barrier and the body is stimulating the immune response because of material (chemicals and allergens) coming through the barrier."
Understanding the genetics of skin disorders may well undergo important implications for more serious illnesses such as asthma. It is not uncommon for a family doctor to face the dilemma of a child who has eczema and then having to decide how aggressively to treat the disease. Eczema is not particularly dangerous but children presenting with eczema commonly go on to develop asthma which severely compromises quality of life and in rare cases can be lethal. Treating eczema with immune-suppressing drugs which may also prevent asthma from developing may cause undesirable align effects.
The genetic studies suggest that researchers now need to cerebrate on both turning down the immune response as well as restoring a normal climb barrier to act the outside world out of the be.
"The barrier function of epithelial surfaces is important in all tissues that have contact with the outside world. In addition to the climb and respiratory tract it includes the gastrointestinal tract and the ocular ascend," said Ali Djalilian. M. D. formerly a investigate fellow and medical officer at the National Eye Institute but now at the University of Illinois in Chicago and the lead author of the paper. "These findings underline the importance of this barrier function and suggests a new strategy for restoring it in human diseases."
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