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J Neurophysiol 80: 3387-3391, 1998;
0022-3077/98 $5.00
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The Journal of Neurophysiology Vol. 80 No. 6 December 1998, pp. 3387-3391
Copyright ©1998 The American Physiological Society

RAPID COMMUNICATION


Na+-Gated Nonselective Cation Channel From Lobster Olfactory Projection Neurons

Aslbek B. Zhainazarov1 and Barry W. Ache1, 2

1 Whitney Laboratory and 2 Departments of Zoology and Neuroscience, University of Florida, St. Augustine, Florida 32086

Zhainazarov, Aslbek B. and Barry W. Ache. Na+-gated nonselective cation channel from lobster olfactory projection neurons. J. Neurophysiol. 80: 3387-3391, 1998. A nonselective cation channel specifically activated by intracellular Na+ was identified in cell-free patches taken from cultured lobster olfactory projection neurons. Na+ reversibly activates the channel in a concentration-dependent manner, with a "half-effect" Na+ concentration of 76.4 mM at -60 mV. The conductance of the channel is 32 pS. The channel is permeable to both alkali metal (Li+ > Na+ > K+ > Rb+ > Cs+) and divalent (Ca2+ > Mn2+ > Sr2+ > Mg2+ > Ba2+ > Na+) cations. The presence of a channel with the ability to generate plateau potentials suggests that the channel may potentially contribute to oscillatory behavior in these olfactory interneurons.




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A. B. Zhainazarov and B. W. Ache
Effects of Phosphatidylinositol 4,5-Bisphosphate and Phosphatidylinositol 4-Phosphate on a Na+-Gated Nonselective Cation Channel
J. Neurosci., April 15, 1999; 19(8): 2929 - 2937.
[Abstract] [Full Text] [PDF]


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