Intracerebral microdialysis as a tool to monitor transmitter release from grafted cholinergic and monoaminergic neurons.

Abstract

In the present study the microdialysis technique has been used as a tool for the study of functional regulation of intracerebrally grafted cholinergic and monoaminergic neurons as well as for the analysis of graft-host interactions. Fetal noradrenergic, serotonergic, dopaminergic, and cholinergic neurons were transplanted into the hippocampus or striatum previously denervated of their intrinsic monoaminergic or cholinergic afferents. After a few months survival, when the grafts had reinnervated the surrounding target, dialysis probes were implanted into the graft-reinnervated region. Although the graft-derived fiber and terminal density varied substantially from one animal to another the transmitters in the extracellular space were maintained at near-normal levels, not only under baseline conditions, but also during K(+)-induced depolarization, transmitter-selective uptake blockade, and tetrodotoxin. This suggests that the grafted neurons possess efficient autoregulatory properties despite their ectopic location. The results also show that monoamine release in the graft-reinnervated host target is impulse-dependent, and that the neurons are spontaneously functionally active at the synaptic level. Electrical stimulation of the lateral habenula (which has previously been identified as a powerful activator of the intrinsic hippocampal cholinergic and noradrenergic afferents) produced a similar increase in the release of these transmitters in the intact and grafted hippocampi. A complex environmental stimulus, such as handling, induced a consistent increase in acetylcholine but not noradrenaline release in the hippocampus. These findings suggest that grafted cholinergic and noradrenergic neurons can be functionally activated by host brain inputs.

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@article{Kaln1990IntracerebralMA, title={Intracerebral microdialysis as a tool to monitor transmitter release from grafted cholinergic and monoaminergic neurons.}, author={Peter Kal{\'e}n and Ola Nilsson and M. Angela Cenci and Evald Rosengren and Olle Lindvall and Anders Bj{\"{o}rklund}, journal={Journal of neuroscience methods}, year={1990}, volume={34 1-3}, pages={107-15} }