Heightened activity in the amygdala — a region of the brain involved in stress — is associated with a greater risk of heart disease and stroke, according to a study published in The Lancet that provides new insights into the possible mechanism by which stress can lead to cardiovascular disease in humans.
Smoking, high blood pressure and diabetes are well-known risk factors for cardiovascular diseases and chronic psychosocial stress could also be a risk factor.The authors suggest a possible biological mechanism, whereby the amygdala signals to the bone marrow to produce extra white blood cells, which in turn act on the arteries causing them to develop plaques and become inflamed, which can cause heart attack and stroke.
The researchers note that the activity seen in the amygdala may contribute to heart disease through additional mechanisms, since the extra white blood cell production and inflammation in the arteries do not account for the full link.
