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J Neurophysiol 51: 375-386, 1984;
0022-3077/84 $5.00
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Journal of Neurophysiology, Vol 51, Issue 2 375-386, Copyright © 1984 by APS

ARTICLES

L-glutamic acid, a possible neurotransmitter to anterior aorta of Aplysia

M. Sawada, D. Gibson and D. J. McAdoo

The effect of L-glutamate on muscle fibers of the anterior aorta of the marine gastropod Aplysia are characterized. Iontophoretically applied L-glutamate depolarized anterior aorta muscle fibers in 14% of the applications; no response was detected in the other applications. Responses to iontophoretically applied L-glutamate desensitize rapidly and are antagonized by 2-amino-4-phosphonobutyric acid (2-APB). 2-APB also blocked excitatory junctional potentials (EJPs) in the anterior aorta. No significant response to D-glutamate was observed. These characteristics match those of L-glutamate at the arthropod neuromuscular junction. Bath-applied L-glutamate also depolarizes anterior aorta muscle fibers, by a mechanism clearly different from that of iontophoretically applied L-glutamate. Present results make L-glutamate a candidate neurotransmitter to molluscan circulatory muscles.


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K. Sasaki, Y. Fujisawa, F. Morishita, O. Matsushima, and Y. Furukawa
The enterins inhibit the contractile activity of the anterior aorta of Aplysia kurodai
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[Abstract] [Full Text] [PDF]


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