An assessment of KIR channel function in human cerebral arteries

Maria Sancho; Yuan Gao; Bjorn O Hald; Hao Yin; Melfort Boulton; David A Steven; Keith W MacDougall; Andrew G Parrent; J Geoffrey Pickering; Donald G Welsh

doi:10.1152/ajpheart.00022.2019

An assessment of K_IR channel function in human cerebral arteries

Maria Sancho, Yuan Gao, Bjorn O Hald, Hao Yin, Melfort Boulton, David A Steven, Keith W MacDougall, Andrew G Parrent, J Geoffrey Pickering, Donald G Welsh

Neuronal Signalling

2 Citations (Scopus)

Abstract

In the rodent cerebral circulation, inward rectifying K+ (KIR) channels set resting tone and the distance over which electrical phenomena spread along the arterial wall. The present study sought to translate these observations into human cerebral arteries obtained from resected brain tissue. Computational modeling and a conduction assay first defined the impact of KIR channels on electrical communication; patch-clamp electrophysiology, quantitative PCR, and immunohistochemistry then characterized KIR2.x channel expression/activity. In keeping with rodent observations, computer modeling highlighted that KIR blockade should constrict cerebral arteries and attenuate electrical communication if functionally expressed. Surprisingly, Ba2+ (a KIR channel inhibitor) had no effect on human cerebral arterial tone or intercellular conduction. In alignment with these observations, immunohistochemistry and patch-clamp electrophysiology revealed minimal KIR channel expression/activity in both smooth muscle and endothelial cells. This absence may be reflective of chronic stress as dysphormic neurons, leukocyte infiltrate, and glial fibrillary acidic protein expression was notable in the epileptic cortex. In closing, KIR2.x channel expression is limited in human cerebral arteries from patients with epilepsy and thus has little impact on resting tone or the spread of vasomotor responses. NEW & NOTEWORTHY KIR2.x channels are expressed in rodent cerebral arterial smooth muscle and endothelial cells. As they are critical to setting membrane potential and the distance signals conduct, we sought to translate this work into humans. Surprisingly, KIR2.x channel activity/expression was limited in human cerebral arteries, a paucity tied to chronic brain stress in the epileptic cortex. Without substantive expression, KIR2.x channels were unable to govern arterial tone or conduction.

Original language	English
Journal	American Journal of Physiology: Heart and Circulatory Physiology
Volume	316
Issue number	4
Pages (from-to)	H794-H800
Number of pages	6
ISSN	0363-6135
DOIs	https://doi.org/10.1152/ajpheart.00022.2019
Publication status	Published - Apr 2019

Keywords

Faculty of Health and Medical Sciences

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Cite this

@article{f24333d9573f4432b0ef45926aa9ad97,

title = "An assessment of KIR channel function in human cerebral arteries",

abstract = "In the rodent cerebral circulation, inward rectifying K+ (KIR) channels set resting tone and the distance over which electrical phenomena spread along the arterial wall. The present study sought to translate these observations into human cerebral arteries obtained from resected brain tissue. Computational modeling and a conduction assay first defined the impact of KIR channels on electrical communication; patch-clamp electrophysiology, quantitative PCR, and immunohistochemistry then characterized KIR2.x channel expression/activity. In keeping with rodent observations, computer modeling highlighted that KIR blockade should constrict cerebral arteries and attenuate electrical communication if functionally expressed. Surprisingly, Ba2+ (a KIR channel inhibitor) had no effect on human cerebral arterial tone or intercellular conduction. In alignment with these observations, immunohistochemistry and patch-clamp electrophysiology revealed minimal KIR channel expression/activity in both smooth muscle and endothelial cells. This absence may be reflective of chronic stress as dysphormic neurons, leukocyte infiltrate, and glial fibrillary acidic protein expression was notable in the epileptic cortex. In closing, KIR2.x channel expression is limited in human cerebral arteries from patients with epilepsy and thus has little impact on resting tone or the spread of vasomotor responses. NEW & NOTEWORTHY KIR2.x channels are expressed in rodent cerebral arterial smooth muscle and endothelial cells. As they are critical to setting membrane potential and the distance signals conduct, we sought to translate this work into humans. Surprisingly, KIR2.x channel activity/expression was limited in human cerebral arteries, a paucity tied to chronic brain stress in the epileptic cortex. Without substantive expression, KIR2.x channels were unable to govern arterial tone or conduction.",

keywords = "Faculty of Health and Medical Sciences, cell-cell communication; endothelium; human arteries; inward rectifying K channels; smooth muscle",

author = "Maria Sancho and Yuan Gao and Hald, {Bjorn O} and Hao Yin and Melfort Boulton and Steven, {David A} and MacDougall, {Keith W} and Parrent, {Andrew G} and Pickering, {J Geoffrey} and Welsh, {Donald G}",

year = "2019",

month = apr,

doi = "10.1152/ajpheart.00022.2019",

language = "English",

volume = "316",

pages = "H794--H800",

journal = "American Journal of Physiology: Heart and Circulatory Physiology",

issn = "0363-6135",

publisher = "American Physiological Society",

number = "4",

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TY - JOUR

T1 - An assessment of KIR channel function in human cerebral arteries

AU - Sancho, Maria

AU - Gao, Yuan

AU - Hald, Bjorn O

AU - Yin, Hao

AU - Boulton, Melfort

AU - Steven, David A

AU - MacDougall, Keith W

AU - Parrent, Andrew G

AU - Pickering, J Geoffrey

AU - Welsh, Donald G

PY - 2019/4

Y1 - 2019/4

N2 - In the rodent cerebral circulation, inward rectifying K+ (KIR) channels set resting tone and the distance over which electrical phenomena spread along the arterial wall. The present study sought to translate these observations into human cerebral arteries obtained from resected brain tissue. Computational modeling and a conduction assay first defined the impact of KIR channels on electrical communication; patch-clamp electrophysiology, quantitative PCR, and immunohistochemistry then characterized KIR2.x channel expression/activity. In keeping with rodent observations, computer modeling highlighted that KIR blockade should constrict cerebral arteries and attenuate electrical communication if functionally expressed. Surprisingly, Ba2+ (a KIR channel inhibitor) had no effect on human cerebral arterial tone or intercellular conduction. In alignment with these observations, immunohistochemistry and patch-clamp electrophysiology revealed minimal KIR channel expression/activity in both smooth muscle and endothelial cells. This absence may be reflective of chronic stress as dysphormic neurons, leukocyte infiltrate, and glial fibrillary acidic protein expression was notable in the epileptic cortex. In closing, KIR2.x channel expression is limited in human cerebral arteries from patients with epilepsy and thus has little impact on resting tone or the spread of vasomotor responses. NEW & NOTEWORTHY KIR2.x channels are expressed in rodent cerebral arterial smooth muscle and endothelial cells. As they are critical to setting membrane potential and the distance signals conduct, we sought to translate this work into humans. Surprisingly, KIR2.x channel activity/expression was limited in human cerebral arteries, a paucity tied to chronic brain stress in the epileptic cortex. Without substantive expression, KIR2.x channels were unable to govern arterial tone or conduction.

AB - In the rodent cerebral circulation, inward rectifying K+ (KIR) channels set resting tone and the distance over which electrical phenomena spread along the arterial wall. The present study sought to translate these observations into human cerebral arteries obtained from resected brain tissue. Computational modeling and a conduction assay first defined the impact of KIR channels on electrical communication; patch-clamp electrophysiology, quantitative PCR, and immunohistochemistry then characterized KIR2.x channel expression/activity. In keeping with rodent observations, computer modeling highlighted that KIR blockade should constrict cerebral arteries and attenuate electrical communication if functionally expressed. Surprisingly, Ba2+ (a KIR channel inhibitor) had no effect on human cerebral arterial tone or intercellular conduction. In alignment with these observations, immunohistochemistry and patch-clamp electrophysiology revealed minimal KIR channel expression/activity in both smooth muscle and endothelial cells. This absence may be reflective of chronic stress as dysphormic neurons, leukocyte infiltrate, and glial fibrillary acidic protein expression was notable in the epileptic cortex. In closing, KIR2.x channel expression is limited in human cerebral arteries from patients with epilepsy and thus has little impact on resting tone or the spread of vasomotor responses. NEW & NOTEWORTHY KIR2.x channels are expressed in rodent cerebral arterial smooth muscle and endothelial cells. As they are critical to setting membrane potential and the distance signals conduct, we sought to translate this work into humans. Surprisingly, KIR2.x channel activity/expression was limited in human cerebral arteries, a paucity tied to chronic brain stress in the epileptic cortex. Without substantive expression, KIR2.x channels were unable to govern arterial tone or conduction.

KW - Faculty of Health and Medical Sciences

KW - cell-cell communication; endothelium; human arteries; inward rectifying K channels; smooth muscle

U2 - 10.1152/ajpheart.00022.2019

DO - 10.1152/ajpheart.00022.2019

M3 - Journal article

C2 - 30681365

SN - 0363-6135

VL - 316

SP - H794-H800

JO - American Journal of Physiology: Heart and Circulatory Physiology

JF - American Journal of Physiology: Heart and Circulatory Physiology

IS - 4

ER -