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Date:11/26/2013

Humankind has a weight problem and not only in the industrialised nations, either: the growing prosperity in many Asian or Latin American countries goes hand in hand with a way of life that quite literally has hefty consequences. Ac-cording to the WHO, over half the population in many industrialised nations is overweight, one in three people extremely so. Not only is high-calorie and fatty food a lifetime on the hips, backside and stomach; it also leaves traces in the blood, where various fats ingested via food circulate. Increased blood-fat values are also regarded as a risk factor for heart attacks and strokes.

Genetic regulatory circuit monitors blood fat

The research group headed by ETH-Zurich professor Martin Fussenegger from the Department of Biosystems Science and Engineering in Basel has now de-veloped an early warning system and treatment: an implantable genetic circuit mainly composed of human gene components. On the one hand, it constantly monitors the circulating fat levels in the blood. On the other hand, it has a feed-back function and forms a messenger substance in response to excessively high blood-fat levels that conveys a sense of satiety to the body.

In order to construct this highly complex regulatory circuit, the biotechnologists skilfully combined different genes that produce particular proteins and reaction steps. They implanted the construct in human cells, which they then inserted into tiny capsules.

The researchers studied obese mice that had been fed fatty food. After the cap-sules with the gene regulatory circuit had been implanted in the animals and intervened due to the excessive levels, the obese mice stopped eating and their bodyweight dropped noticeably as a result. As the blood-fat levels also returned to normal, the regulatory circuit stopped producing the satiety signal.

"The mice lost weight although we kept giving them as much high-calorie food as they could eat," stresse
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Contact: Martin Fussenegger
martin.fussenegger@bsse.ethz.ch
41-613-873-160
ETH Zurich
Source:Eurekalert  

Page: 1 2

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