Early handling can attenuate adverse effects of fetal ethanol exposure.
The effects of early handling on physiological and hormonal responses of rats exposed to ethanol prenatally were studied. Male and female Sprague-Dawley rats from prenatal ethanol (E), pair-fed (PF), and ad lib-fed control (C) prenatal treatment groups were either handled (H) or nonhandled (NH) during the preweaning period and tested in adulthood. Early handling eliminated the deficit in preweaning weight gain observed in E compared to PF and C offspring. In adulthood, early handling eliminated the increased hypothermia observed in E and PF compared to C males following an ethanol challenge (2.0 g/kg, IP). In addition, H males displayed marginally less hypothermia overall than NH males. In contrast, handling accelerated the return to preinjection temperature in PF and C females but had no effect on E females. There were no significant differences among E, PF, and C rats in corticosterone (CORT) responses to ethanol challenge (1.5 g/kg, IP), but both males (marginally) and females in the H condition displayed higher CORT levels overall than NH rats. Early handling also eliminated the increased peak CORT response to restraint stress in E compared to C females, but did not affect the more prolonged elevation of CORT in E compared to PF and C females. There were no differences among E, PF, and C females in hippocampal type I and type II glucocorticoid receptor density or affinity. However, binding affinity of type II receptors was slightly but significantly increased in H compared to NH females. Together, these data indicate that early handling may modulate or attenuate some, but not all, of the adverse effects of fetal ethanol exposure on offspring growth and physiological responsiveness.
Weinberg
J
J
Department of Anatomy, Faculty of Medicine, University of British Columbia, Vancouver, Canada.
Kim
C K
CK
Yu
W
W
D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development / Q000502:physiology*; D003345:Corticosterone / Q000097:blood; D000431:Ethanol / Q000494:pharmacology*; D005260:Female; D006234:Handling, Psychological; D007035:Hypothermia / Q000139:chemically induced; D008297:Male; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D011965:Receptors, Glucocorticoid / Q000378:metabolism; D012149:Restraint, Physical; D013312:Stress, Physiological / Q000097:blood
D011965:Receptors, Glucocorticoid; D000431:Ethanol; D003345:Corticosterone