Conductance rise induced by the calcium ionophore A23187 in unfertilized eggs of tilapia | Zendy

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Conductance rise induced by the calcium ionophore A23187 in unfertilized eggs of tilapia

Author(s) -

House CR

Publication year - 1991

Publication title -

experimental physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.925

H-Index - 101

eISSN - 1469-445X

pISSN - 0958-0670

DOI - 10.1113/expphysiol.1991.sp003531

Subject(s) - ionophore , conductance , depolarization , membrane potential , tilapia , calcium , biophysics , voltage clamp , reversal potential , chemistry , membrane , patch clamp , electrophysiology , biology , fish <actinopterygii> , biochemistry , fishery , neuroscience , mathematics , organic chemistry , combinatorics

Current‐clamp measurements on unfertilized tilapia eggs gave linear current‐voltage relations in the range 0 to ‐120 mV. Eggs had low resting potentials (‐22 mV) and high specific membrane resistances (500 k omega cm2) and specific membrane capacitances (0.9 microF cm‐2) indicating no marked folding of their plasma membrane. Application of A23187 induced a small depolarization and a conductance rise, the response having a reversal potential of about ‐16 mV. The results suggest that tilapia eggs have a calcium‐gated conductance probably activated at fertilization.

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