Adrenergic alpha-2 receptor antagonists regulate noise–induced metabolic and cognitive changes in rats

Abstract

Background: Noise is a modern life wide-spread stressor produced by urban traffic and the industrial environment. The noise stress causes central nervous system’s dysfunction and neurotransmission impairment in the brain, as well as changes the hormones levels which potentially result in psychological and behavioral problems. Underscoring the implications of the chronic stress, the aim of our investigation was to study the level of the malondialdehyde (MDA) in the plasma and erythrocytes’ membrane (EM), as well as the behavioral characteristics of experimental animals, and the influences of the α2-adrenoblockers to evident their modulating effect during noise exposure. Results: The obtained results imply increase of plasma and erythrocytes’ membrane MDA content which is an indicator of oxidative stress development. At the same time the noise impact decreases cognitive functions. Conclusion: The use of α2-adrenoblockers to the noise-exposed animals by the specific tests revealed a regulatory effect on the noise time-dependent delay in behavioral activity manifested by disorientation, increased anxiety, the spatial memory deficit. Reduction of the noise impact by α2-adrenoblockers was expressed by less level of MDA in the EM, in the 3rd and the 4th groups.