No long-term effect two years after intrauterine exposure to dexamethasone on dentate gyrus volume, neuronal proliferation and differentiation in common marmoset monkeys.
Glucocorticoids are prenatally administered to promote the maturation of the lungs. They, however, can affect neuronal proliferation and differentiation. In newborn marmoset monkeys, intrauterine hyperexposure to dexamethasone (DEX) resulted in a significantly decreased proliferation rate in the hippocampal dentate gyrus without affecting neuronal differentiation. In this study, marmoset monkeys received 5 mg/kg body weight DEX either during early (days 42-48) or late (days 90-96) pregnancy. The volume of the dentate granule cell layer as well as the proliferation and neuronal differentiation in the dentate gyrus of their 2-year-old offspring were investigated. The density of proliferating cells (Ki-67), apoptotic cells (in situ tailing) and cells differentiating to neurons (double cortin, TUC-4 and calretinin) were determined immunohistochemically. Analysis of the dentate granule cell layer volume showed no significant differences between early or late DEX-exposed marmosets and untreated control animals. Similarly, proliferation and neuronal differentiation in DEX-treated animals was not significantly different in comparison with controls. In summary, the decreased proliferation rate observed in newborn marmosets after intrauterine exposure to DEX was no longer detectable in their 2-year-old siblings suggesting no long-lasting effect of prenatal hyperexposure to DEX on neuronal proliferation and differentiation in the dentate gyrus of marmoset monkeys.
Tauber
Simone C
SC
Department of Neurology, Georg-August-University, Göttingen, Germany.
Bunkowski
Stephanie
S
Schlumbohm
Christina
C
Rühlmann
Malte
M
Fuchs
Eberhard
E
Nau
Roland
R
Gerber
Joachim
J
D000014:Abnormalities, Drug-Induced / Q000473:pathology / Q000503:physiopathology; D000818:Animals; D000831:Animals, Newborn; D000893:Anti-Inflammatory Agents / Q000009:adverse effects; D015415:Biomarkers / Q000032:analysis / Q000378:metabolism; D064032:Calbindin 2; D002144:Callithrix; D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D049109:Cell Proliferation / Q000187:drug effects; D018891:Dentate Gyrus / Q000002:abnormalities* / Q000187:drug effects* / Q000503:physiopathology; D003907:Dexamethasone / Q000009:adverse effects*; D004195:Disease Models, Animal; D000089622:Doublecortin Domain Proteins; D005260:Female; D036341:Intercellular Signaling Peptides and Proteins / Q000032:analysis / Q000378:metabolism; D019394:Ki-67 Antigen / Q000032:analysis / Q000378:metabolism; D008297:Male; D008869:Microtubule-Associated Proteins / Q000032:analysis / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000032:analysis / Q000378:metabolism; D009421:Nervous System Malformations / Q000139:chemically induced* / Q000473:pathology* / Q000503:physiopathology; D009479:Neuropeptides / Q000032:analysis / Q000378:metabolism; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects / Q000473:pathology* / Q000503:physiopathology; D064030:S100 Calcium Binding Protein G / Q000032:analysis / Q000378:metabolism; D013995:Time
D000893:Anti-Inflammatory Agents; D015415:Biomarkers; D064032:Calbindin 2; D000089622:Doublecortin Domain Proteins; D036341:Intercellular Signaling Peptides and Proteins; D019394:Ki-67 Antigen; D008869:Microtubule-Associated Proteins; D009419:Nerve Tissue Proteins; D009479:Neuropeptides; D064030:S100 Calcium Binding Protein G; C095114:collapsin response mediator protein-2; D003907:Dexamethasone