Ca2+-dependent kinetics of hair cell Ca2+ currents resolved with the use of cesium BAPTA.

Abstract:

:Hair cells in the frog semicircular canal, studied by the whole-cell patch-clamp technique, display three distinct Ca2+ currents: two non-inactivating components (L type and R type, the latter termed R2 in the following) and a second R type current (termed R1), which runs down first and inactivates in a Ca2+-dependent fashion. Since intracellular EGTA, up to 5 mM, did not display major effects on such inactivation, we used increasing amounts of BAPTA in the patch pipette, to control [Ca2+]i more efficiently and investigate whether modifications in [Ca2+]i at the cytoplasmic side of the channel affect the inactivation of the RI component and in general the gating of all channel types. The results here reported show that (1) K+ currents heavily contaminate recordings obtained using high concentrations of BAPTA in its commercially available K+ salt form; (2) BAPTA Cs+ salt can be satisfactorily employed to obtain reliable recordings; (3) the kinetics of channel gating and R1-channel inactivation are indeed markedly affected by effectively buffering [Ca2+]i.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Rispoli G,Martini M,Rossi ML,Rubbini G,Fesce R

doi

10.1097/00001756-200008210-00032

subject

Has Abstract

pub_date

2000-08-21 00:00:00

pages

2769-74

issue

12

eissn

0959-4965

issn

1473-558X

journal_volume

11

pub_type

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