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Targeted delivery of losartan reduces liver inflammation and scarring
Date:3/1/2010

A recent study found that rats with advanced fibrosis that were administered a short-term dose of losartan-M6PHSA had reduced liver inflammation and fibrosis. Those animals treated with oral losartan alone did not experience a similar reduction in disease activity. Results of this study appear in the March issue of Hepatology, a journal published by Wiley-Blackwell on behalf of the American Association for the Study of Liver Diseases.

Liver fibrosis a consequence of liver disease was thought to be irreversible and only transplantation of the liver would offer survival to the patient. Doctors now believe that early detection of fibrosis offers potential for therapies that prevent further liver scarring and the imminent need for transplantation.

In the current study, a Spanish research team led Ramn Bataller, M.D., from the Hospital Clnic in Barcelona investigated such a treatment, losartan-M6PHSA, in rat models. Losartan is an angiotensin (AT1) receptor blocker that was linked to mannose-6-phosphate modified human serum albumin (M6PHSA), a selective drug carrier targeting hepatic stellate cells (HSC). An average of 7 losartan molecules were coupled to M6PHSA. The study verified that losartan-M6PHSA accumulates in the fibrotic liver only, and other organs such as the lungs, heart, spleen and kidneys did not display the conjugate.

Researchers induced liver fibrosis in male rats by bile duct ligation to study short-term treatment outcomes. In both models, rats were given daily injections of saline, losartan-M6PHSA (3.3 mg/kg/day, to 125 g losartan/kg), M6PHSA alone (3.3 mg/kg/day), or oral losartan (5 mg/kg/day). Bile duct-ligated rates treated with saline of M6PHSA alone showed severe fibrosis. "Animals treated with losartan-M6PHSA displayed less collagen deposition with less frequent formation of bridging fibrosis," said Dr. Bataller. "Short-term oral treatment with losartan alone did not reduce fibrosis or the amount
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Contact: Dawn Peters
medicalnews@wiley.com
781-388-8408
Wiley-Blackwell
Source:Eurekalert

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