Watching neurons feeds obesity knowledge

Scientists say they can now measure how full or hungry a mouse feels, thanks to a new technique which reveals how neurons behave in the part of the brain which regulates appetite.

Examining neurons directly can give clues as to how appetite is regulated (credit: MethoxyRoxy)

Researchers hope the technique, which uses magnetic resonance imaging, will enable a far greater understanding of why certain people become obese when others do not, and why different people have different appetites.

Research leader Professor Jimmy Bell, from the MRC Clinical Sciences Centre at Imperial College London, said: “Appetite and appetite control are important components of why people put on weight. We know very little about the mechanisms behind these processes and why they can vary so much between individuals. In the past we have had to rely on asking people how hungry they feel, this can be very subjective. Furthermore, sometimes your sense of satiety can be significantly affected by other factors such as your mood.”

Scientists had already identified the part of the hypothalamus area of the brain which regulates appetite. In this study, the researchers discovered that they could see the neurons there firing if they used a contrast agent of manganese ion to make the neurons visible on a magnetic resonance imaging scan.

When the mouse was hungry the neurons showed increased activity and the contrast agent was taken up, making the neurons ‘light up’ on the scan. The intensity of this signal decreased as the mouse became less hungry and the neurons became less active. The new research is the first to identify which contrast agent is taken up by the ‘hunger’ neurons and hence allow researchers to observe how they behave in response to different stimuli.

Mice given the contrast agent were also given one of two types of hormone. These were either pancreatic peptide YY (PYY), which is known to inhibit appetite, or ghrelin, which is known to increase it. The scientists then monitored the reactions of the ‘hunger’ neurons to these stimuli. As expected, the intensity of the neurons’ signals increased when ghrelin was administered and decreased with PYY.

Professor Bell said: “Our new method is much more reliable and completely objective. With murine models, we can now look directly at neuronal activity in the brain. We are working on developing similar methods to study neuronal activity in the appetite centers in people.”

The study is published in the Journal of Neuroscience.