This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Copyright Permission Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Kapoor, A. Articles by Matthews, S. G. Search for Related Content PubMed PubMed Citation Articles by Kapoor, A. Articles by Matthews, S. G.

Prenatal Stress Modifies Behavior and Hypothalamic-Pituitary-Adrenal Function in Female Guinea Pig Offspring: Effects of Timing of Prenatal Stress and Stage of Reproductive Cycle

Departments of Physiology, Obstetrics and Gynaecology, and Medicine, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada M5S 1A8

Address all correspondence and requests for reprints to: Dr. S. G. Matthews, Department of Physiology, Faculty of Medicine, University of Toronto, Medical Sciences Building, 1 King’s College Circle, Toronto, Ontario, Canada M5S 1A8. E-mail: stephen.matthews{at}utoronto.ca.

Prenatal stress is associated with altered behavior and hypothalamic-pituitary-adrenal (HPA) axis function postnatally. Recent studies suggest that these outcomes are dependent on the timing of the prenatal stress. The majority of these studies have been carried out in male offspring. We hypothesized that a short period of prenatal stress would result in female offspring that exhibit differences in open-field behavior and HPA axis activity, but the outcome would depend on the timing of the prenatal stress and the stage of the reproductive cycle. Pregnant guinea pigs were exposed to a strobe light during the fetal brain growth spurt [gestational d 50–52 (PS50)] or during the period of rapid brain myelination [gestational d 60–62 (PS60)]. Open-field activity was assessed in juvenile and adult female offspring. HPA axis function was tested in adult offspring. All tests in adulthood were carried out during the estrous and luteal phases of the reproductive cycle to determine the effect of stage on HPA axis programming. Tissues were collected upon completion of the study for analysis by in situ hybridization. PS60 offspring exhibited decreased activity in an open field during the estrous phase of the reproductive cycle compared with control offspring. Both PS50 and PS60 offspring exhibited a lower salivary cortisol response to a stressor, only during the estrous phase. Consistent with the behavioral and endocrine data, PS60 females exhibited lower plasma estradiol levels, reduced ovary weight, and increased glucocorticoid receptor mRNA in the paraventricular nucleus. In conclusion, we have demonstrated that there are effects of prenatal stress on behavior and HPA axis functioning in female offspring but that the outcomes are dependent on the timing of the prenatal stress together with the status of the reproductive cycle.