Extracellular calcium affects the membrane currents of cultured human keratinocytes.

Abstract:

:Electrophysiologic properties of cultured human keratinocytes were studied using the patch voltage-clamp technique. Undifferentiated, proliferative keratinocytes grown in low Ca2+ medium had an average resting membrane potential of -24 mV. Voltage-clamp experiments showed that these cells had two membrane ionic currents: a large voltage-independent leak conductance, and a smaller voltage-dependent Cl- current that activated with depolarization. Increasing the extracellular Ca2+ concentration from 0.15 to 2 mM resulted in a doubling of the magnitude of the voltage-gated current and a shift in current activation to more negative potentials. Since levels of extracellular Ca2+ can alter the morphology and differentiation state of keratinocytes, the finding of a Ca2(+)-activated Cl- current in these cells suggests a role for this conductance in the initiation of differentiation.

journal_name

J Cell Physiol

authors

Mauro TM,Pappone PA,Isseroff RR

doi

10.1002/jcp.1041430103

subject

Has Abstract

pub_date

1990-04-01 00:00:00

pages

13-20

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

143

pub_type

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