Intrauterine exposure to dexamethasone impairs proliferation but not neuronal differentiation in the dentate gyrus of newborn common marmoset monkeys.
Glucocorticoids applied prenatally alter birth weight and the maturation of the lungs. Moreover, glucocorticoids impair neuronal proliferation and differentiation in the hippocampal dentate gyrus. In the present study proliferation and neuronal differentiation in the dentate gyrus were studied in newborn common marmoset monkeys which were intrauterinely exposed to the synthetic glucocorticoid dexamethasone (DEX). Pregnant marmoset monkeys received DEX (5 mg/kg body weight) daily either during early (days 42-48) or late (days 90-96) pregnancy. In the hippocampi of newborn monkeys immunohistochemistry was performed with markers of proliferation (Ki-67), apoptosis (in situ tailing) as well as early and late neuronal differentiation (calretinin and calbindin). Both after early and late intrauterine exposure to DEX, proliferation of dentate gyrus cells was significantly decreased (P < 0.05). The density of apoptotic neurons was not altered by DEX treatment. Quantification of calretinin- and calbindin-immunoreactive neurons showed no significant differences between DEX-exposed and control animals. In conclusion, the proliferation of putative precursor cells but not the differentiation into mature cells was impaired in the dentate gyrus of newborn marmosets exposed intrauterinely to DEX.
Tauber
Simone C
SC
Department of Neurology, Georg-August-University, Göttingen, Germany.
Schlumbohm
Christina
C
Schilg
Lenka
L
Fuchs
Eberhard
E
Nau
Roland
R
Gerber
Joachim
J
D000818:Animals; D000831:Animals, Newborn; D064032:Calbindin 2; D064026:Calbindins; D002144:Callithrix; D002454:Cell Differentiation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects*; D018891:Dentate Gyrus / Q000187:drug effects* / Q000378:metabolism; D003907:Dexamethasone / Q000009:adverse effects*; D005260:Female; D005938:Glucocorticoids / Q000009:adverse effects*; D007150:Immunohistochemistry; D009474:Neurons / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects / Q000139:chemically induced / Q000473:pathology*; D064030:S100 Calcium Binding Protein G / Q000378:metabolism
D064032:Calbindin 2; D064026:Calbindins; D005938:Glucocorticoids; D064030:S100 Calcium Binding Protein G; D003907:Dexamethasone