Induced membrane hypo/hyper-mechanosensitivity: a limitation of patch-clamp recording.

Abstract:

:Practical limitations of the patch-clamp technique when recording mechanogated membrane ion channels are considered. Mechanical overstimulation of the patch or the cell from excessive suction/pressure protocols induces morphological and functional changes. In particular, the plasma membrane becomes decoupled from the underlying cytoskeleton to form either membrane blebs (cell-attached) or ghosts (whole cell). As a consequence, a membrane ion channel may show either a decrease or an increase in its native mechanosensitivity or even acquire mechanosensitivity. The effect varies with ion channel and cell type and presumably arises because of a disruption of membrane-cytoskeleton interactions. We consider that such disruptions are a pathological consequence of excessive mechanical stress, either during or after seal formation, rather than an immutable consequence of patch-clamp recording. By careful attention to the suction/pressure protocols during sealing and throughout recording, such artifacts can be avoided.

journal_name

Annu Rev Physiol

authors

Hamill OP,McBride DW Jr

doi

10.1146/annurev.physiol.59.1.621

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

621-31

eissn

0066-4278

issn

1545-1585

journal_volume

59

pub_type

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