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Electrophysiological changes in laterodorsal tegmental neurons associated with prenatal nicotine exposure: implications for heightened susceptibility to addict to drugs of abuse

Published online by Cambridge University Press:  23 October 2014

M. H. Christensen ,
M. L. Nielsen  and
K. A. Kohlmeier
M. H. Christensen
Affiliation:
Department of Drug design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Denmark
M. L. Nielsen
Affiliation:
Department of Drug design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Denmark
K. A. Kohlmeier*
Affiliation:
Department of Drug design and Pharmacology, Faculty of Health Sciences, University of Copenhagen, Denmark
*
*Address for correspondence: K. A. Kohlmeier, Department of Drug Design and Pharmacology, Faculty of Health Sciences, Universitetsparken 2, University of Copenhagen, Copenhagen 2100, Denmark. (Email kak1@sund.ku.dk)
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Abstract

Prenatal nicotine exposure (PNE) is a risk factor for developing an addiction to nicotine at a later stage in life. Understanding the neurobiological changes in reward related circuitry induced by exposure to nicotine prenatally is vital if we are to combat the heightened addiction liability in these vulnerable individuals. The laterodorsal tegmental nucleus (LDT), which is comprised of cholinergic, GABAergic and glutamatergic neurons, is importantly involved in reward mediation via demonstrated excitatory projections to dopamine-containing ventral tegmental neurons. PNE could lead to alterations in LDT neurons that would be expected to alter responses to later-life nicotine exposure. To examine this issue, we monitored nicotine-induced responses of LDT neurons in brain slices of PNE and drug naive mice using calcium imaging and whole-cell patch clamping. Nicotine was found to induce rises in calcium in a smaller proportion of LDT cells in PNE mice aged 7–15 days and smaller rises in calcium in PNE animals from postnatal ages 11–21 days when compared with age-matched control animals. While inward currents induced by nicotine were not found to be different, nicotine did induce larger amplitude excitatory postsynaptic currents in PNE animals in the oldest age group when compared with amplitudes induced in similar-aged control animals. Immunohistochemically identified cholinergic LDT cells from PNE animals exhibited slower spike rise and decay slopes, which likely contributed to the wider action potential observed. Further, PNE was associated with a more negative action potential afterhyperpolarization in cholinergic cells. Interestingly, the changes found in these parameters in animals exposed prenatally to nicotine were age related, in that they were not apparent in animals from the oldest age group examined. Taken together, our data suggest that PNE induces changes in cholinergic LDT cells that would be expected to alter cellular excitability. As the changes are age related, these PNE-associated alterations could contribute differentially across ontogeny to nicotine-mediated reward and may contribute to the particular susceptibility of in utero nicotine exposed individuals to addict to nicotine upon nicotine exposure in the juvenile period.

Keywords

addictionLDTREM sleepmouse
Type
Original Article
Information
Journal of Developmental Origins of Health and Disease , Volume 6 , Issue 3 , June 2015 , pp. 182 - 200
Copyright
© Cambridge University Press and the International Society for Developmental Origins of Health and Disease 2014 

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