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2015 ; 3
(4
): e1105907
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A proposed route to independent measurements of tight junction conductance at
discrete cell junctions
#MMPMID26716077
Zhou L
; Zeng Y
; Baker LA
; Hou J
Tissue Barriers
2015[Oct]; 3
(4
): e1105907
PMID26716077
show ga
Direct recording of tight junction permeability is of pivotal importance to many
biologic fields. Previous approaches bear an intrinsic disadvantage due to the
difficulty of separating tight junction conductance from nearby membrane
conductance. Here, we propose the design of Double whole-cell Voltage Clamp - Ion
Conductance Microscopy (DVC-ICM) based on previously demonstrated potentiometric
scanning of local conductive pathways. As proposed, DVC-ICM utilizes two
coordinated whole-cell patch-clamps to neutralize the apical membrane current
during potentiometric scanning, which in models described here will profoundly
enhance the specificity of tight junction recording. Several potential pitfalls
are considered, evaluated and addressed with alternative countermeasures.