Biol. Bull.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF) Free
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Norekian, T. P.
Right arrow Articles by Satterlie, R. A.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Norekian, T. P.
Right arrow Articles by Satterlie, R. A.

The Biological Bulletin, Vol 185, Issue 2 248-262, Copyright © 1993 by Marine Biological Laboratory

NEUROBIOLOGY AND BEHAVIOR

FMRFamide and GABA Produce Functionally Opposite Effects on Prey-Capture Reactions in the Pteropod Mollusk Clione limacina

T. P. Norekian and R. A. Satterlie
Department of Zoology, Arizona State University, Tempe, Arizona 85287-1501

The effects of FMRFamide and gamma-aminobutyric acid (GABA) on prey-capture reactions in Clione and on cerebral A and B neurons, which control opposite movements of prey capture appendages, have been studied. FMRFamide hyperpolarized A neurons and depolarized and increased spike activity in B neurons. FMRFamide thus had a reciprocal effect on A and B neurons, triggering buccal cone withdrawal. In addition, FMRFamide inhibited swimming, acceleration of which is a component of feeding arousal. Many neurons throughout the central nervous system showed FMRFamide immunoreactivity. Dense networks of immunoreactive fibers were localized in the head wall, buccal mass and in buccal cones, adjacent to striated longitudinal muscle cells. In wings, immunoreactive processes were found mainly in association with smooth retractor muscles. GABA depolarized and activated A neurons but hyperpolarized and inhibited B neurons. The overall effect of GABA thus resulted in extrusion of buccal cones. Both direct GABA responses and inhibitory postsynaptic potentials (IPSPs) induced in B neurons by A neuron activity were chloride-mediated. However, picrotoxin and bicuculline did not block IPSPs or direct GABA responses in B cells.


This article has been cited by other articles:


Home page
 J. Neurophysiol.Home page
M. Diaz-Rios and M. W. Miller
Rapid Dopaminergic Signaling by Interneurons That Contain Markers for Catecholamines and GABA in the Feeding Circuitry of Aplysia
J Neurophysiol, April 1, 2005; 93(4): 2142 - 2156.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
T. P. Norekian and A. Y. Malyshev
Coordinated Excitatory Effect of GABAergic Interneurons on Three Feeding Motor Programs in the Mollusk Clione limacina
J Neurophysiol, January 1, 2005; 93(1): 305 - 315.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
T. G. Deliagina, G. N. Orlovsky, A. I. Selverston, and Y. I. Arshavsky
Asymmetrical Effect of GABA on the Postural Orientation in Clione
J Neurophysiol, September 1, 2000; 84(3): 1673 - 1676.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurosci.Home page
T. P. Norekian
GABAergic Excitatory Synapses and Electrical Coupling Sustain Prolonged Discharges in the Prey Capture Neural Network of Clione limacina
J. Neurosci., March 1, 1999; 19(5): 1863 - 1875.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1993 by the Marine Biological Laboratory.