Charles Explorer logo
🇨🇿

Anticipation of Acute Stress in Isoprenaline Sensitive and Resistant Rats: Strain and Gender Differences

Publikace na Ústřední knihovna, Lékařská fakulta v Plzni, 3. lékařská fakulta |
2000

Tento text není v aktuálním jazyce dostupný. Zobrazuje se verze "en".Abstrakt

The effect of stress anticipation was studied in two inbred Wistar rat strains with high and low sensitivity to isoprenaline. The animals were exposed to tail-flick and 4-hr water immersion restraint stress on two consecutive days.

On the first day stress was applied to one group and the next day to the anticipation group. The changes in adrenal, heart and spleen weights, tail-flick latency, incidence of gastric ulcers, and the antioxidant defense system in the sensorimotor cortex were compared with two non-stressed control groups.

Anticipatory stress decreased adrenal weights. The content of thiobarbituric acid reactive substances (TBARS) was increased both in acute and anticipatory stress; superoxide dismutase, glutathione peroxidase, and antioxidative capacity were increased in anticipatory stress only.

Stress anticipation decreased the pain threshold in the isoprenaline-sensitive and increased in the isoprenaline-resistant rats and led to more frequent gastric ulcers in the isoprenaline-resistant group. Significant sex differences were observed both in adrenal weights and TEARS content.

The relative adrenal weights were negatively correlated with the TEARS content. We suggest that the outcome of anticipatory stress may depend upon the relation between the hormonal and antioxidant functions of the adrenals and that anticipation-induced activation of antioxidant enzymes may ameliorate the acute stress response.

Anticipation itself was found to be a stronger stressor than physical acute stress.