Experimental Physiology
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Experimental Physiology 76.4 pp 619-622
© The Physiological Society 1991
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Experimental Physiology, Vol 76, Issue 4, 619-622
Copyright © 1991 by The Physiological Society

Article

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

CR House

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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Copyright © 1991 by the The Physiological Society.