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New light shed on the enigma of salt intake and hypertension
Date:5/4/2009

A high salt intake has been implicated in cardiovascular disease risk for 5000 years. But salt-sensitive hypertension still remains an enigma. Now, investigators from Germany at the University of Erlangen, the Max Delbrck Center for Molecular Medicine (MDC) Berlin-Buch and Regensburg, collaborating with researchers from Finland and Austria have shed new light on the relationship between salt intake, bodily processes, and blood pressure regulation. Within the skin, they have detected a new storage area for salt in the body. They also found out that if the process behind this storage is defect, animals become hypertensive (Nature Medicine, doi 10.1038/nm.1960)*.

Salt (natrium chloride, NaCl) is required for life. Herbivores (plant-eating animals) risk their lives to go to "salt licks" and carnivores (meat-eating animals) go to salt licks to eat herbivores in order to obtain salt.

Salt is responsible for water regulation in the body. It is taken up by the gastro-intestinal (GI) tract and, in large part, excreted by the kidneys. However, salt is also stored in cells and in the interstitium, the area between cells in the body.

Dr. Jens Titze and colleages, among them Dominik N. Mller, Wolfgang Derer, and Friedrich C. Luft from the Experimental and Clinical Research Center at the MDC, could now show that a high-salt diet in rats leads to the accumulation of salt in the interstitium in the skin. This process is carefully regulated by special white blood cells, the macrophages.

In those macrophages, the scientists found a gene regulator (transcription factor) called TonEBP (tonicity-responsible enhancer binding protein). TonEBP is activated in these cells in response to high salt and turns on a gene (VEGF-C - vascular endothelial growth factor C) that controls the production of lymphatic blood vessels. With high-salt diet the lymphatic vessels increase.

The investigators also showed that when these macrophages ar
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Contact: Barbara Bachtler
bachtler@mdc-berlin.de
49-309-406-3896
Helmholtz Association of German Research Centres
Source:Eurekalert

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