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[Mode of action of benfluorex. Recent data].

An increased risk of developing premature atherosclerosis is associated with stress, diabetes, obesity, and hypertension. These conditions are associated with insulin resistance, hyperglycemia, hypertriglyceridemia and hypercholesterolemia. An alternative way of interpreting insulin resistance is to consider that metabolism in this condition would be regulated to a greater extent by stress hormones and in particular by cortisol. Glucocorticoids and fatty acids (which are produced in response to stress) antagonise the actions of insulin in promoting glucose uptake and protein synthesis, in decreasing gluconeogenesis and protein catabolism, and promoting the clearance of intermediate density lipoprotein and low density lipoprotein from the circulation by the liver. They also promote the secretion of very low density lipoprotein thus producing hypertriglyceridemia and hypercholesterolemia. By contrast to this antagonism, cortisol can also facilitate the action of insulin in stimulating the storage of energy via glycogen and fatty acid synthesis and through lipoprotein lipase in adipose tissue. These effects are significant in relation to obesity and to weight gain. An increased control of metabolism by cortisol therefore produces changes in metabolism that are potentially atherogenic and it is associated with insulin resistance and the other risk factors for atherosclerosis. Benfluorex treatment improves insulin sensitivity and has antihyperglycemic and hypolipidemic effects in human beings and in experimental animals. These effects can be observed independently of weight loss, but lowering food intake also produces a metabolic benefit. Long-term treatment with benfluorex can also decrease stress responses in terms of glucocorticoid release and the stimulation of lipolysis probably by its serotoninergic control of the hypothalamic-pituitary-adrenal axis. Such an action provides for an integrated treatment of the obese-diabetic-hyperlipidemic syndrome. Benfluorex produces overall changes in metabolism that tend to normalise the major risk factors associated with premature atherosclerosis. This provides a potential advantage over other therapies for atherosclerosis which may ameliorate a symptom (e.g., hyperlipidemia) without treating the underlying metabolic disturbance that predisposes to atherogenesis.