Tryptophan is one of the 20 standard amino acids, as well as an essential amino acid in the human diet.
A team, led by researchers at the Carnegie Institution,* has found a key biochemical cycle that suppresses the immune response, thereby allowing cancer cells to multiply unabated.
Women and men appear to respond differently to the same biochemical manipulation.
Chocolate is the most widely and frequently craved food. People readily admit to being 'addicted to chocolate' or willingly label themselves as 'chocoholics'. A popular explanation for this is that chocolate contains mood-enhancing (psychoactive) ingredients that give it special appeal.
One way tumors fly under the radar of the immune system is by using IDO, an enzyme used by fetuses to help avoid rejection, to recruit powerful regulatory T cells that turn down the immune response, researchers say.
A natural mechanism pirated by tumors and HIV to evade the immune response is opening the door to better treatment for these conditions, researchers say.
The most important factor in what kind of sweetener people prefer has little to do with how sweet it tastes. Rather, it has more to do with other tastes in the sweetener, such as bitterness or sourness, new research suggests.
Scientists from two universities in Italy and Virginia Tech in the United States have determined the structure of a protein that is responsible for the production xanthurenic acid (XA) in Anopheles gambiae, the malaria carrying mosquitoes.
Scientists at Innsbruck Medical University have succeeded in demonstrating the anti-inflammatory effect of beer extracts.
Having high blood pressure and a particular genetic alteration dramatically increases the risk of heart attack, stroke or death, and may explain why some hypertensive patients fare worse than others - even if they take the same medication, University of Florida researchers announced.
Tryptophan is the source of Thanksgiving legend and grist for a "Seinfeld" episode, but it's not the chemical that you'd expect to find in Lawrence Steinman's lab.
A bacterial mimic under study as a cancer vaccine because it signals the immune system to attack may also help some tumors hide, researchers have found.
In unprecedented new research, scientists at Rice University have combined theory and experiment for the first time to both predict theoretically and verify experimentally the protein-folding dynamics of a large, complex protein.
Johns Hopkins scientists have discovered internal "shipping labels" that allow -- and perhaps force -- hundreds if not thousands of proteins to get to the surface of cells and stay there.
"It is important for parents to identify the sleep needs of their children especially as they prepare for another school year," says Dr. Kohler. "Getting kids in school sleep mode can take time and sleep needs for teens are different from elementary school children."
A gene that signals a yeast cell to make bread rise and mice to eat a better diet also helps selectively silence the immune system, researchers have found.
A mutant gene that starves the brain of serotonin, a mood-regulating chemical messenger, has been discovered and found to be 10 times more prevalent in depressed patients than in control subjects, report researchers funded by the National Institutes of Health’s National Institute of Mental Health (NIMH) and National Heart Lung and Blood Institute (NHLBI).
A newly discovered genetic defect might represent an important risk factor for major depression, a condition which effects 20 million people in the U.S., according to Duke University Medical Center researchers.
Two studies published in the 2004 November- December issue of Psychotherapy and Psychosomatics suggest that dietary B vitamin complex has an important role as to the vulnerability to depression.
A brain imaging study by the NIH's National Institute of Mental Health (NIMH) has found that an emotion-regulating brain circuit is overactive in people prone to depression – even when they are not depressed.
Feeling sick can be "all in the head" for people with inflammatory disorders or for those receiving immunotherapy, say Robert Dantzer and Keith Kelley, professors in the department of animal sciences at the University of Illinois at Urbana-Champaign.