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Related Concept Videos

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Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
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Small Molecules for Early Endosome-Specific Patch Clamping.

Cheng-Chang Chen1, Elisabeth S Butz1, Yu-Kai Chao1

  • 1Department of Pharmacy, Center for Drug Research and Center for Integrated Protein Science Munich (CIPSM), Ludwig-Maximilians-Universität München, 81377 Munich, Germany.

Cell Chemical Biology
|July 22, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to study ion channels in early endosomes (EE) and late endosomes/lysosomes (LE/LY). Wortmannin and latrunculin B selectively enlarge EE, enabling TRPML channel function analysis in these organelles.

Keywords:
TRPMLTRPML1TRPML3endosomelatrunculin Bwortmannin

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Physiology

Background:

  • Endolysosomal ion channels are crucial for cellular function.
  • Determining their subcellular localization is challenging.
  • Existing methods for organelle isolation or manipulation are limited.

Purpose of the Study:

  • To establish a novel experimental approach for selective patch-clamping of early endosomes (EE) and late endosomes/lysosomes (LE/LY).
  • To identify small molecules that selectively enlarge specific endolysosomal compartments for functional analysis.
  • To investigate the subcellular distribution and function of TRPML channels.

Main Methods:

  • Development of a patch-clamp technique targeting specific endolysosomal compartments.
  • Screening of small molecules for selective organelle enlargement.
  • Application of the developed method to study TRPML3 channel activity in EE and LE/LY.

Main Results:

  • Wortmannin and latrunculin B, when combined, selectively enlarge Rab5-positive early endosomes (EE) but not other endolysosomal vesicles.
  • This novel approach allows for rapid, specific, and applicable functional characterization of ion channels in distinct endolysosomal compartments.
  • TRPML channels, including TRPML3, were found to be functionally active in both EE and LE/LY in both overexpressing cells and endogenous lung macrophages.

Conclusions:

  • A new method using wortmannin and latrunculin B enables selective enlargement of early endosomes for patch-clamp analysis.
  • This approach facilitates the study of ion channel function at specific subcellular locations within the endolysosomal system.
  • TRPML channels exhibit functional activity across both early and late endolysosomal compartments, suggesting diverse roles in cellular processes.