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The Journal of Neuroscience, April 15, 1999, 19(8):3073-3093

Spatiotemporal Patterns of Activity in an Intact Mammalian Network with Single-Cell Resolution: Optical Studies of Nicotinic Activity in an Enteric Plexus

Ana Lía Obaid^{1, 2}, Takeshi Koyano¹, Jon Lindstrom¹, Tetsuro Sakai¹, and B. M. Salzberg^{1, 2}

Departments of ¹ Neuroscience and ² Physiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6074

Multiple Site Optical Recording of Transmembrane Voltage (MSORTV) has been used to measure, continuously and simultaneously, the spontaneous electrical activity from all of the neurons in individual ganglia or up to five interconnected ganglia of the submucous plexus of the guinea pig small intestine. These are the first optical recordings of electrical activity with single-cell resolution from a mammalian nervous system. They are used to investigate the effects of acute and chronic application of nicotine on the firing patterns of this neural network containing important cholinergic components. After washout of acutely applied nicotine, the firing rates of selected neurons were dramatically elevated. These results suggest that nAChRs that reversibly desensitize after exposure to nicotine may be responsible for the enhancement of activity that is observed after a brief application of this agonist. In addition, immunostaining with monoclonal antibodies was used to localize 3/5, 7, and 2 nAChR subunits, and the results demonstrate the prevalence of 3/5. It is this 3-containing nAChR subtype that probably accounts for most of the excess activity elicited by nicotine application.

Key words: optical recording; enteric nervous system; submucous plexus; nicotinic ACh receptors; voltage-sensitive dye; di-8-ANEPPS; phototoxicity

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Copyright © 1999 Society for Neuroscience  0270-6474/99/1983073-21$05.00/0

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