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J Neurophysiol 90: 2190-2204, 2003. First published June 11, 2003; doi:10.1152/jn.00173.2003
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A Newly Identified Buccal Interneuron Initiates and Modulates Feeding Motor Programs in Aplysia

N. C. Dembrow, J. Jing, A. Proekt, A. Romero, F. S. Vilim, E. C. Cropper and K. R. Weiss

Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, New York 10029

Submitted 25 January 2003; accepted in final form 5 June 2003

Despite considerable progress in characterizing the feeding central pattern generator (CPG) in Aplysia, the full complement of neurons that generate feeding motor programs has not yet been identified. The distribution of neuropeptide-containing neurons in the buccal and cerebral ganglia can be used as a tool to identify additional elements of the feeding circuitry by providing distinctions between otherwise morphologically indistinct neurons. For example, our recent study revealed a unique and potentially interesting unpaired PRQFVamide (PRQFVa)-containing neuron in the buccal ganglion. In this study, we describe the morphological and electrophysiological characterization of this novel neuron, which we designate as B50. We found that activation of B50 is capable of producing organized rhythmic output of the feeding CPG. The motor programs elicited by B50 exhibit some similarities as well as differences to motor programs elicited by the command-like cerebral-to-buccal interneuron CBI-2. In addition to activating the feeding CPG, B50 may act as a program modulator.

Address for reprint requests and other correspondence: K. R. Weiss, Department of Physiology and Biophysics, Box 1218, Mount Sinai School of Medicine, New York, NY 10029 (E-mail: klaudiusz.weiss{at}mssm.edu).




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