As it is also known that administered corticosteroids induce hypercholesterolemia, hypertriglyceridemia, and hypertension and that

elevated morning Cortisol concentrations are correlated with coronary artherosclerosis,5 a relationship between depression and vascular diseases seems plausible. However, in recent years, a paradoxical phenomenon has emerged from neurobiological studies Inhibitors,research,lifescience,medical on the effect of chronic stress, as a number of studies have provided evi dence that the adrenal gland is hypoactive in some stressrelated states, resulting in hypocortisolism. This enhanced negative feedback sensitivity of glucocorticoid receptors or a persistent Inhibitors,research,lifescience,medical lack of Cortisol availability can be observed in posttraumatic stress disorder and in other conditions such as chronic fatigue syndrome, fibromyalgia (FM), and rheumatoid arthritis. It was proposed that traumatized or chronically stressed individuals may have an increased vulnerability for stress-related somatic disorders.6 Figure 1 Interactions between brain and body. CRF, corticotropin-releasing factor; ACTH, adrenocorticotropic hormone; E, epinephrine;

NE, norepinephrine; 5-HT, Lapatinib 5-hydroxytryptamine (serotonin); DA, dopamine; Inhibitors,research,lifescience,medical NK, natural killer. The monoamine neurotransmitter systems, serotonin (5-hydroxytryptamine, 5-HT), norepinephrine (NE), and dopamine Inhibitors,research,lifescience,medical (DA), which are cornerstones of the hypotheses of psychiatric disorders, play important roles

in mood, cognition, learning, motor activity, vigilance, reward, sleep, appetite, and cardiovascular function. Although their most important cell bodies are located in relatively small areas of the brain Inhibitors,research,lifescience,medical or brain stem, axonal projections are sent throughout the brain along specific pathways to mediate specific functions; when dysfunctional, they generate many symptoms of psychiatric disorders. On the other hand, axonal projections are also sent Histone demethylase down the spinal cord, where they act as key homeostatic regulators to vegetative function or sensations coming from the internal milieu of the body. Thus, NE is also a major neurotransmitter in postganglionic sympathetic synapses and alterations in function of their transporters or receptors are compromised in cardiomyopathy, heart failure, hypertension, and ischemia.7 Our understanding of the immunomodulatory activities of numerous neuroendocrine mediators, such as Cortisol, sex hormones, catecholamines, or corticotropin-releasing hormone (CRH) has advanced substantially. Proinflammatory cytokines are also expressed in the brain by microglia, astrocytes, oligodendrocytes, and neurons, and mediate the response to acute and chronic inflammatory CNS diseases.