Abstract
Blood levels of nonesterified fatty acids, total cholesterol, triglycerides, and LDL increased in rats subjected to forced swimming stress. Administration of opioid peptides dynorphin A(1-13), DSLET, or DAGO reduced stress-induced disturbances in lipid metabolism. Dynorphin A(1-13) and DAGO produced the most pronounced effects and prevented an increase in concentrations of nonesterified fatty acids, triglycerides, total cholesterol, and LDL as soon as 39 h after treatment. Only DSLET increased HDL content in the plasma of stressed rats. The observed effects can be explained by the stress-limiting effects of opioids, e.g. attenuation of the effect of catecholamines on the adipose tissue and inhibition of the generation LPO products suppressing activity of the cholesterol metabolizing enzyme.
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