The reversal potential of the spike afterhyperpolarization in bullfrog sympathetic neurons.

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概要

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• Intracellular recordings were made from neurons in bullfrog sympathetic ganglia maintained in vitro. The action potential afterhyperpolarization was comprised of two components, namely an initial, shorter-lasting (up to 200ms) event and a later, longer-lasting (up to 2500ms) one, both of which resulted from an opening of potassium channels. Both of these components reversed their polarities at between-80 and -100mV. The initial part of the afterhyperpolarization, however, always reversed its polarity at a less negative potential than the latter part. Mathematical analysis, by means of a hypothetical membrane equivalent circuit, revealed that this difference in the reversal potentials could be explained by a simple potassium-channel opening hypothesis without considering any additional current other than potassium-current for either component of the spike afterhyperpolarization.

• 久留米大学医学部 The Kurume Medical Journal 編集部の論文

著者

• TOKIMASA TAKAYUKI

  Department of Internal Medicine and Department of Physiology, Kurume University School of Medicine

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