Citrulline is a non-essential amino acid. In hepatocytes, L-citrulline is synthesized in the urea cycle by the addition of carbon dioxide and ammonia to ornithine. L-citrulline is converted into L-arginine by the enzymes argininosuccinate synthetase and argininosuccinate lyase in the presence of L-aspartate and ATP. Subsequently, L-arginine is converted to nitric oxide by nitric oxide synthase and L-citrulline is regenerated as a by-product.
Scientists from the Florida campus of The Scripps Research Institute have developed a novel technology that can identify, in animal models, potential biomarkers of ulcerative colitis, a type of inflammatory bowel disease that affects the lining of the colon.
New groundbreaking research by scientists at Trinity College Dublin has found that exposure to nanoparticles can have a serious impact on health, linking it to rheumatoid arthritis and the development of other serious autoimmune diseases.
NPS Pharmaceuticals, Inc., a specialty pharmaceutical company developing innovative therapeutics for rare gastrointestinal and endocrine disorders, today reported the presentation of data at the Digestive Disease Week (DDW) meeting held May 19-22 in San Diego.
NPS Pharmaceuticals, Inc., a specialty pharmaceutical company developing orphan therapeutics for rare gastrointestinal and endocrine disorders, today reported its results for the first quarter of 2012.
Children born with heart defects that pummel their lungs with up to three times the normal blood volume quickly find their lungs in jeopardy as well.
No matter how you slice it, watermelon has a lot going for it -- sweet, low calorie, high fiber, nutrient rich -- and now, there's more. Evidence from a pilot study led by food scientists at The Florida State University suggests that watermelon can be an effective natural weapon against prehypertension, a precursor to cardiovascular disease.
Elevated levels of the enzyme arginase contribute to vascular eye damage and Medical College of Georgia researchers say therapies to normalize its levels could halt progression of potentially blinding diseases such as diabetic retinopathy.
Recent genetic studies have revealed several new sites of genes that are risk factors for developing rheumatoid arthritis (RA).
A cold slice of watermelon has long been a Fourth of July holiday staple. But according to recent studies, the juicy fruit may be better suited for Valentine's Day.
Peter K. Gregersen, MD, stares at x-rays of hands, searching out the telltale signs of inflamed joints and wrists from his research subjects with rheumatoid arthritis. With these clinical features at his side, he turns to the basic building blocks of life , the human genome , to figure out what makes these people susceptible to the disabling inflammatory condition.
Rheumatoid arthritis (RA) is one of the most common systemic autoimmune diseases, and one of the least understood. Smoking is the major known environmental risk factor for RA, though little is known about the mechanisms involved.
Occupational exposure to mineral oils, in particular hydraulic or motor oil, increases the risk of developing rheumatoid arthritis by 30%. These are the results of a study published today in Arthritis Research & Therapy.