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Insulin receptor in Aplysia neurons: characterization, molecular cloning, and modulation of ion currents

EA Jonas, RJ Knox, LK Kaczmarek, JH Schwartz and DH Solomon
Journal of Neuroscience 1 March 1996, 16 (5) 1645-1658; DOI: https://doi.org/10.1523/JNEUROSCI.16-05-01645.1996
EA Jonas
Center for Neurobiology and Behavior, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
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RJ Knox
Center for Neurobiology and Behavior, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
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LK Kaczmarek
Center for Neurobiology and Behavior, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
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JH Schwartz
Center for Neurobiology and Behavior, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
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DH Solomon
Center for Neurobiology and Behavior, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
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Abstract

We have isolated the cDNA for a tyrosine kinase receptor that is expressed in the nervous system of Aplysia californica and that is similar to the vertebrate insulin receptor. Binding studies and immunocytochemical staining show that the receptor is abundant in the bag cell neurons. Application of vertebrate insulin to clusters of bag cell neurons stimulates the phosphorylation of the receptor on tyrosine residues, and exposure of isolated bag cell neurons to insulin produces an increase in height and a decrease in duration of the action potentials that can be detected within 15–30 min. These effects were not seen with insulin-like growth factor-1. In voltage-clamped neurons, insulin produces an increase in the amplitude of the voltage-dependent Ca2+ current that can be blocked by preincubation with herbimycin A, an inhibitor of tyrosine kinases. Insulin also enhances a delayed K+ current. We suggest that insulin-like peptides regulate the excitability of the bag cell neurons.

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The Journal of Neuroscience: 16 (5)
Journal of Neuroscience
Vol. 16, Issue 5
1 Mar 1996
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Insulin receptor in Aplysia neurons: characterization, molecular cloning, and modulation of ion currents
EA Jonas, RJ Knox, LK Kaczmarek, JH Schwartz, DH Solomon
Journal of Neuroscience 1 March 1996, 16 (5) 1645-1658; DOI: 10.1523/JNEUROSCI.16-05-01645.1996

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Insulin receptor in Aplysia neurons: characterization, molecular cloning, and modulation of ion currents
EA Jonas, RJ Knox, LK Kaczmarek, JH Schwartz, DH Solomon
Journal of Neuroscience 1 March 1996, 16 (5) 1645-1658; DOI: 10.1523/JNEUROSCI.16-05-01645.1996
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