Source: Malysz, J. et al. Preparation and Utilization of Freshly Isolated Human Detrusor Smooth Muscle Cells for Characterization of 9-Phenanthrol-Sensitive Cation Currents. J. Vis. Exp. (2020)
This video demonstrates the characterization of cationic currents from transient receptor potential melastatin type 4 (TRPM4) ion channels in detrusor smooth muscle cells using amphotericin-B mediated perforated patch-clamp technique. The technique helps evaluate the biophysical and pharmacological properties of ion channels.
The authors have nothing to disclose.
5 ml polystyrene round-bottom tube | Falcon | 352054 | Tubes for DS containing enzymes used in digestion steps |
Amphotericin-B | Fisher | BP928-250 | Used for patch/cell perforation |
Amphotericin-B | European Pharmacopoeia Reference Standards | 5 | Used for patch/cell perforation |
Amphotericin-B | Sigma-Aldrich | A9528-100MG | Used for patch/cell perforation |
Analog vortex mixer | VWR | 58816-121 | |
Aspartic acid | Sigma-Aldrich | A9006 | Intracellular pipette solution |
Bovine serum albumin | Sigma-Aldrich | A7906 | DS |
CaCl2 | Sigma-Aldrich | C1016 | Extracellular solution and DS |
Capillary Glass | Sutter | BF150-110-7.5 | Capillary for preparation of pulled patch electrodes |
Cesium hydroxide hydrate | Sigma-Aldrich | C8518 | Intracellular pipette solution |
Clampex ver. 10 software includes data acqusition (Clampex) and analysis (Clampfit) programs | Axon Instruments/ Molecular Devices | pCLAMP-10 | Commerical software and part of patch-clamp rig setup |
CsCl | Sigma-Aldrich | 203025 | Extracellular and intracellular solutions |
Dental wax | Miltex Dental Wax Technologies, Inc. | 18058351 | |
Dimethyl sulfoxide (DMSO) | Sigma-Aldrich | D2650 | Solvent |
EGTA | Sigma-Aldrich | E3889 | Ca2+ chelator, used in intracellular pipette solution |
Flaming/Brown micropipette puller | Sutter | P-97 | Required to pull electrodes with very fine tips |
Floating foam tube rack/holder | VWR Scientific | 82017-634 | Used for holding tubes with enzymes for temperature control |
Glucose | Sigma | G8270 | |
Glutamic acid (Na salt) | Sigma-Aldrich | G1626 | DS |
HEPES | Sigma-Aldrich | H3375 | pH Buffer |
KCl | Fisher Scientific | BP366-1 | Extracellular solution |
Low Noise Data Acquisition System | Axon Instruments/ Molecular Devices | Digidata 1440A | Part of patch-clamp rig setup |
Magnetic stirrer | VWR | 01-442-684 | |
MgCl2 (hexahydrate) | Sigma-Aldrich | M2670 | Extracellular and intracellular solutions |
MicroForge | Narishige | MF-830 | Used for fire-polishing electrodes |
NaCl | Sigma-Aldrich | S7653 | Extracellular and intracellular solutions |
NaOH | Sigma-Aldrich | S8045 | |
Nifedipine | Sigma-Aldrich | N7634 | L-type voltage-gated Ca2+ channel blocker |
Nikon inverted microscope, TS100 with T1-SM stage with 5x, 10x, 20x, and 40x objectives | Nikon | Discontinued | Part of Patch-clamp rig setup |
Non-metalic syringe needle, MicroFil | WPI | MF-34G-5 | Filling of intracellular pipette solution |
Pasteur pipette | FisherBrand | 13-678-20A | Tips are broken off and fire-polished and used for titration of enzymatically treated tissues to release single DSM cells from pieces |
Patch-clamp amplifier | Axon Instruments/ Molecular Devices | Axon Axopatch 200B | Part of patch-clamp rig setup |
PC computer | DELL | Custom configuration | Part of patch-clamp rig setup |
pH Meter | Aspera Instruments | PH700 | |
Polyethylene tubing | Intramedic | 427-436 | Tubing for superfusion of extracellular bath connected to glass-bottom recording chamber |
Tetraethylammonium chloride | Sigma-Aldrich | T2265 | Ion channel blocker of Kv and BK channels added to the extracellular bath solution |
Weighting scale | Mettler Toledo | XS64 | |
ZeissAxiovert 40C inverted microscope with 10x and 40x objectives | Carl-Zeiss | Discontinued | Part of patch-clamp rig setup |