The association of SLE with atherosclerosis suggests a common pathogenic mechanism. SLE and atherosclerosis are immune complex-mediated diseases. The integration of metabolism and immunity, which under normal conditions is beneficial for the maintenance of good health, can become deteriorative under conditions of metabolic challenge, as exemplified by the immunosuppression characteristic of malnourished or starving individuals. It is now apparent that obesity is associated with a state of chronic inflammation, particularly in white adipose tissue. However, in the absence of obesity, infusion of animals with inflammatory cytokines or lipids can cause insulin resistance. It is possible that the stresses of obesity are similar enough to the stresses of an infection and the body reacts to obesity as it would to an infection. Atherosclerosis can be considered to have a significant chronic inflammatory component. Inflammation also contributes to the typical dyslipidemia associated with SLE that is characterized by elevations of VLDL, LDL and triglycerides as well as reduced HDL. The link between insulin resistance and SLE can be explained by the chronic inflammatory state, and the consequent dyslipoproteinemia.
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