Isolation and transfection of myenteric neurons from mice for patch-clamp applications

Frontiers in Molecular Neuroscience, vol. 15, pp. 1076187

Abstract

The enteric nervous system (ENS) is a complex neuronal network organized in ganglionated plexuses that extend along the entire length of the gastrointestinal tract. Largely independent of the central nervous system, the ENS coordinates motility and peristalsis of the digestive tract, regulates secretion and absorption, and is involved in immunological processes. Electrophysiological methods such as the patch-clamp technique are particularly suitable to study the function of neurons as well as the biophysical parameters of the underlying ion channels under both physiological and pathophysiological conditions. However, application of the patch-clamp method to ENS neurons remained difficult because they are embedded in substantial tissue layers that limit access to and targeted manipulation of these cells. Here, we present a robust step-by-step protocol that involves isolation of ENS neurons from adult mice, culturing of the cells, their transfection with plasmid DNA, and subsequent electrophysiological characterization of individual neurons in current-clamp and voltage-clamp recordings. With this protocol, ENS neurons can be prepared, transfected, and electrophysiologically characterized within 72 h. Using isolated ENS neurons, we demonstrate the feasibility of the approach by functional overexpression of recombinant voltage-gated NaV1.9 mutant channels associated with hereditary sensory and autonomic neuropathy type 7 (HSAN-7), a disorder characterized by congenital analgesia and severe constipation that can require parenteral nutrition. Although our focus is on the electrophysiological evaluation of isolated ENS neurons, the presented methodology is also useful to analyze molecules other than sodium channels or to apply alternative downstream assays including calcium imaging, proteomic and nucleic acid approaches, or immunochemistry.

Authors 9

1. Samuel Kuehs

   University of Lübeck

   Affiliation as printed

   Department of Anesthesiology and Intensive Care, Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany

2. Laura Teege

   University of Lübeck

   Affiliation as printed

   Department of Anesthesiology and Intensive Care, Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany

3. Ann-Katrin Hellberg

   University of Lübeck

   Affiliation as printed

   Department of Anesthesiology and Intensive Care, Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany

4. Christina Stanke

   University of Lübeck

   Affiliation as printed

   Department of Anesthesiology and Intensive Care, Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany

5. Natja Haag Aachen Medical Faculty Institute for Human Genetics and Genomic Medicine Institute of Physiology, Medical Faculty

   RWTH Aachen University

   Affiliation as printed

   Institute for Human Genetics and Genomic Medicine, Medical Faculty, Rhine-Westphalia Technical University of Aachen, Aachen, Germany

   Institute of Physiology, Medical Faculty, Rhine-Westphalia Technical University of Aachen, Aachen, Germany

6. Ingo Kurth Aachen Medical Faculty Institute for Human Genetics and Genomic Medicine

   RWTH Aachen University

   Affiliation as printed

   Institute for Human Genetics and Genomic Medicine, Medical Faculty, Rhine-Westphalia Technical University of Aachen, Aachen, Germany

7. Robert Blum

   University of Würzburg · Universitätsklinikum Würzburg

   Affiliation as printed

   Department of Neurology, University Hospital of Würzburg, Würzburg, Germany

8. Carla Nau

   University of Lübeck

   Affiliation as printed

   Department of Anesthesiology and Intensive Care, Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany

9. Enrico Leipold corresponding

   University of Lübeck

   Affiliation as printed

   Department of Anesthesiology and Intensive Care, Center of Brain, Behavior and Metabolism (CBBM), University of Lübeck, Lübeck, Germany