Correlation of Physiological Parameters in Rats after Stress Exposure under Conditions of Antigenic Stimulation with Lipopolysaccharide Administration.

We studied correlation dependences between physiological parameters in rats in 3 h, 1 day, and 8 days after administration of LPS (100 μg/kg) at the end of 24-h immobilization stress. In 3 h after LPS administration against the background of stress exposure, significant correlations of metabolic parameters with the relative weight of the adrenal glands and the perceptual component of nociception in rats were revealed. A direct relationship between the concentration of the proinflammatory cytokine TNFα and anti-inflammatory IL-4 was also found in these animals. On the first day after LPS injection, correlations were revealed, predominantly positive, only between the indicators of the cytokine blood profile. In the late post-stress period after antigenic exposure, no correlations between the studied physiological parameters were found. It can be hypothesized that immune modulation through systemic administration of LPS prevents persistent excessive stress of physiological functions at the later stages after stress exposure.