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Brain Structure and Function

Erschienen in:

26.02.2015 | Original Article

Impact of prenatal nicotine on the structure of midbrain dopamine regions in the rat

verfasst von: Natalia Omelchenko, Priya Roy, Judith Joyce Balcita-Pedicino, Samuel Poloyac, Susan R. Sesack

Erschienen in: Brain Structure and Function | Ausgabe 4/2016

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Abstract

In utero exposure of rats to nicotine (NIC) provides a useful animal model for studying the impact of smoking during pregnancy on human offspring. Certain sequelae of prenatal NIC exposure suggest an impact on the development of the midbrain dopamine (DA) system, which receives a robust cholinergic innervation from the mesopontine tegmentum. We therefore investigated whether prenatal NIC induced structural changes in cells and synapses within the midbrain that persisted into adulthood. Osmotic minipumps delivering either sodium bitartrate (vehicle; VEH) or NIC bitartrate at 2 mg/kg/day were implanted into nine timed-pregnant dams at E4. At birth, rat pups were culled to litters of six males each, and the litters were cross-fostered. Plasma levels of NIC and cotinine from killed pups provided evidence of NIC exposure in utero. Pups separated from dams at weaning showed a trend toward reduced locomotor activity at this time point but not when tested again in adulthood. Adult rats were killed for anatomical studies. Estimates of brain size and volume did not vary with NIC treatment. Midbrain sections stained for Nissl or by immunoperoxidase for tyrosine hydroxylase and analyzed using unbiased stereology revealed no changes in volume or cell number in the substantia nigra compacta or ventral tegmental area as a result of NIC exposure. Within the ventral tegmental area, electron microscopic physical disector analysis showed no significant differences in the number of axon terminals or the number of asymmetric (putative excitatory) or symmetric (putative inhibitory) synapses. Although too infrequent to estimate by unbiased stereology, no obvious difference in the proportion of cholinergic axons was noted in NIC- versus VEH-treated animals. These data suggest that activation of nicotinic receptors during prenatal development induces no significant modifications in the structure of cells in the ventral midbrain when assessed in adulthood.

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Titel: Impact of prenatal nicotine on the structure of midbrain dopamine regions in the rat
verfasst von: Natalia Omelchenko
Priya Roy
Judith Joyce Balcita-Pedicino
Samuel Poloyac
Susan R. Sesack
Publikationsdatum: 26.02.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Brain Structure and Function / Ausgabe 4/2016
Print ISSN: 1863-2653
Elektronische ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-015-1014-y

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