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Functional expression of TREK1 channel in human bone marrow and human umbilical cord vein-derived mesenchymal stem cells

사람의 골수와 제대정맥에서 유래된 중간엽 줄기세포에서 TREK1 통로의 기능적 발현

  • Park, Kyoung Sun (Division of Molecular and Life Sciences, Hanyang University) ;
  • Kim, Yangmi (Department of Physiology, College of Medicine, Chungbuk National University)
  • 박경선 (한양대학교 분자생명과학부) ;
  • 김양미 (충북대학교 의과대학 생리학교실)
  • Received : 2015.02.16
  • Accepted : 2015.03.12
  • Published : 2015.03.31

Abstract

Human bone marrow or human umbilical cord vein derived-mesenchymal stem cells (hBM-MSCs or hUC-MSCs) have known as a potentially useful cell type for clinical therapeutic applications. We investigated two-pore domain potassium (K2P) channels in these cells. K2P channels play a major role in setting the resting membrane potential in many cell types. Among them, TREK1 is targets of hydrogen, hypoxia, polyunsaturated fatty acids, antidepressant, and neurotransmitters. We investigated whether hBM-MSCs and hUC-MSCs express functional TREK1 channel using RT-PCR analysis and patch clamp technique. Potassium channel with a single channel conductance of 100 pS was found in hUC-MSCs and BM-MSCs and the channel was activated by membrane stretch (-5 mmHg ~ -15 mmHg), arachidonic acid ($10{\mu}M$) and intracellular acidosis (pH 6.0). These electrophysiological properties were similar to those of TREK1. Our results suggest that TREK1 is functionally present in hBM-MSCs and hUC-MSCs, where they contribute to its resting membrane potential.

사람의 골수 또는 제대정맥에서 유래된 중간엽 줄기 세포 (hBM-MSC 또는 hUC-MSC)는 임상적 치료 적용에 매우 유용한 세포유형으로 알려져 왔다. 우리는 이러한 세포에서 two-pore 도메인 포타슘 (K2P)채널을 조사하였다. K2P 채널은 다양한 세포유형들에서 안정막 전위를 형성하는데 중요한 역할을 한다. 그들 중 TREK1은 수소, 저산소증, 다불포화 지방산, 항우울제 및 신경전달물질들의 표적이다. 우리는 RT-PCR 분석과 팻취고정기법을 이용하여 hBM-MSCs와 hUC-MSC가 기능적인 TREK1 채널을 발현하는지 조사했다. hBM-MSCs와 hUC-MSCs에서 100 pS 단일 채널 전도도를 가진 포타슘채널이 발견되었고, 그 채널은 세포막 신전 (-5 mmHg ~ -15 mmHg), 아라키도닉산 ($10{\mu}M$), 세포내 산성화 (pH 6.0)에 의해 활성화 되었다. 이러한 전기생리학적 성질은 TREK1과 유사하였다. 우리의 결과는 안정막 전위에 기여하는 TREK1 채널이 hBM-MSC와 hUC-MSC에 기능적으로 존재하고 있음을 제시한다.

Keywords

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