Effect of Interleukin-1β on Lipid Peroxidation in Emotiogenic Structures of the Brain in Rats during Acute Stress

Abstract

We studied the effects of immunomodulatory cytokine interleukin-1β on lipid peroxidation in emotiogenic structures of the brain (hypothalamus, sensorimotor cortex, and amygdala) of behaviorally active and passive rats with different prognostic resistance to stress. Immobilization of animals with simultaneous electrocutaneous stimulation (1 h) served as the model of acute emotional stress. Intraperitoneal injection of IL-1β (5 μg/kg) was followed by accumulation of malonic dialdehyde (end-product of lipid peroxidation) in all structures of the brain in passive rats, as well as in the hypothalamus of active animals. As differentiated from active rats, stress exposure in passive specimens was accompanied by a selective increase in malonic dialdehyde content in the sensorimotor cortex and amygdala. Pretreatment with IL-1β prevented activation of lipid peroxidation in the studied structures of the brain in passive rats after stress exposure. Our results show the specific effect of IL-1β on free-radical processes in the hypothalamus, sensorimotor cortex, and amygdala in rats with various behavioral parameters. Regional features of lipid peroxidation in emotiogenic structures of the brain in animals with different emotional reactivity probably contribute to the existence of significant variations in the individual resistance to emotional stress.

Modulating Effect of Interleukin-4 on Free Radical Processes in the Brain of Rats during Emotional Stress

“…In our previous research, the pronounced modulating infl uence of key pro-infl ammatory cytokine IL-1β on the intensity of free radical processes in the emotiogenic brain structures was revealed [4]. The impact of IL-1β on LPO differs in rats with various behavioral characteristics, which are considered as a prognostic criterion of animal resistance to emotional stress [3].…”