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New Hope For People With Liver And Kidney Ailments

Every year there are many deaths reported owing to higher levels of ammonia in the blood resulting in liver and kidney disease. Researchers from the United States// and Japan have come out with a possible solution for this. According to an article in the April 2007 issue of The FASEB Journal, there is a similarity between the protein which secretes ammonia in pufferfish gills and human Rh blood protein. A treatment can be arrived at by targeting human Rh proteins which will people with damaged livers and kidneys in removing toxic ammonia from their bloodstream.

"Rh proteins are important targets for treatment of high toxic blood ammonia levels that occur in liver disease," said Shigehisa Hirose, co-author of the study. "Our findings also indicate that the ammonia transport system involving Rh glycoproteins is evolutionally conserved in a broad range of organisms, suggesting an essential role for surviving."

For people with kidney and liver damage, the need to remove naturally occurring ammonia from the bloodstream is critical. Brain cells are particularly susceptible to ammonia, and at low levels, ammonia toxicity can cause mild to severe confusion, drowsiness, or tremors. At high levels, ammonia toxicity leads to coma and eventually death. Rh blood proteins are most commonly recognized as being used to help define blood type. For instance, people who are type A, B, AB, or O positive have Rh blood proteins on the surface of their red blood cells. People who are type A, B, AB, or O negative do not have Rh proteins on the surface of their red blood cells.

"This study has broad implications for practically any disease or trauma affecting the liver or kidneys," said Gerald Weissmann, M.D., Editor-in-Chief of The FASEB Journal. "And the evolutionary implications make it even more compelling—hook, line, and sinker."

In addition to describing a new target for removing ammonia from the body, this study describes how fish gills are a ble to excrete ammonia at the molecular level using Rh proteins. This finding, when combined with the presence of Rh proteins in numerous organisms, adds a piece to the evolutionary puzzle, by suggesting that Rh proteins were developed very early in the evolution of animal systems, and continue to play an important role in removing toxic ammonia.


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