Scientists have found the gene that connects stress to obesity and diabetes.
Dr. Alon Chen of the Weizmann Institute's Neurobiology Department and his research team have now discovered that changes in the activity of a single gene in the brain not only cause mice to exhibit anxious behavior, but also lead to metabolic changes that cause the mice to develop symptoms associated with type 2 diabetes.
All of the body's systems are involved in the stress response, which evolved to deal with threats and danger.
Behavioural changes tied to stress include heightened anxiety and concentration, while other changes in the body include heat-generation, changes the metabolism of various substances and even changes in food preferences.
The research team suspected that a protein known as Urocortin-3 (Ucn3) ties all of these things together. This protein is produced in certain brain cells - especially in times of stress - and it's known to play a role in regulating the body's stress response.
These nerve cells have extensions that act as 'highways' that speed Ucn3 on to two other sites in the brain: One, in the hypothalamus - the brain's center for hormonal regulation of basic bodily functions - oversees, among other things, substance exchange and feelings of hunger and satiety; the other is involved in regulating behavior, including levels of anxiety.
Nerve cells in both these areas have special receptors for Ucn3 on their surfaces, and the protein binds to these receptors to initiate the stress response.
The researchers developed a new, finely-tuned method for influencing the activity of a single gene in one area in the brain, using it to increase the amounts of Ucn3 produced in just that location.
They found that heightened levels of the protein produced two different effects: The mice's anxiety-related behavior increased, and their bodies underwent metabolic changes, as well.
With excess Ucn3, their bodies burned more sugar and fewer fatty acids, and their metabolic rate sped up.
These mice began to show signs of the first stages of type 2 diabetes: A drop in muscle sensitivity to insulin delayed sugar uptake by the cells, resulting in raised sugar levels in the blood. Their pancreas then produced extra insulin to make up for the perceived 'deficit.'
"We showed that the actions of single gene in just one part of the brain can have profound effects on the metabolism of the whole body," Chen said.
These findings were published online this week in the Proceedings of the National Academy of Sciences (PNAS).