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J Neurophysiol 85: 1424-1435, 2001;
0022-3077/01 $5.00
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The Journal of Neurophysiology Vol. 85 No. 4 April 2001, pp. 1424-1435
Copyright ©2001 by the American Physiological Society

RPCH Modulation of a Multi-Oscillator Network: Effects on the Pyloric Network of the Spiny Lobster

Patsy S. Dickinson, Jane Hauptman, John Hetling, and Anand Mahadevan

Department of Biology, Bowdoin College, Brunswick, Maine 04011

Dickinson, Patsy S., Jane Hauptman, John Hetling, and Anand Mahadevan. RPCH Modulation of a Multi-Oscillator Network: Effects on the Pyloric Network of the Spiny Lobster. J. Neurophysiol. 85: 1424-1435, 2001. The neuropeptide red pigment concentrating hormone (RPCH), which we have previously shown to activate the cardiac sac motor pattern and lead to a conjoint gastric mill-cardiac sac pattern in the spiny lobster Panulirus, also activates and modulates the pyloric pattern. Like the activity of gastric mill neurons in RPCH, the pattern of activity in the pyloric neurons is considerably more complex than that seen in control saline. This reflects the influence of the cardiac sac motor pattern, and particularly the upstream inferior ventricular (IV) neurons, on many of the pyloric neurons. RPCH intensifies this interaction by increasing the strength of the synaptic connections between the IV neurons and their targets in the stomatogastric ganglion. At the same time, RPCH enhances postinhibitory rebound in the lateral pyloric (LP) neuron. Taken together, these factors largely explain the complex pyloric pattern recorded in RPCH in Panulirus.




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