Whole-cell recording using the perforated patch clamp technique.

Area of Science:

• Physiology
• Biophysics
• Cell Biology

Background:

• Intracellular substances like nucleotides and Ca(2+) regulate ion channels, especially potassium channels.
• Standard whole-cell patch clamp washes out these essential intracellular modulators.
• Channel "run down" occurs when these modulators are lost, affecting channel function.

Purpose of the Study:

• To introduce and explain the perforated patch clamp recording technique.
• To highlight the advantages of perforated patch clamp over standard whole-cell recording for preserving intracellular components.
• To demonstrate how this method maintains cytoplasmic integrity and prevents channel rundown.

Main Methods:

• Utilizing pore-forming antibiotics (nystatin or amphotericin B) to create a permeable membrane patch.
• Establishing electrical access between the cell and patch pipette while retaining cytoplasmic factors.
• Comparing outcomes with standard whole-cell patch clamp methods.

Main Results:

• Perforated patch clamp allows electrical access while maintaining the integrity of the cytoplasm.
• Soluble second messengers and other cytoplasmic components remain within the cell.
• The technique effectively prevents the phenomenon of channel "run down".

Conclusions:

• Perforated patch clamp recording is a superior method for studying ion channels regulated by intracellular substances.
• This technique preserves crucial cellular components, ensuring more physiologically relevant experimental conditions.
• It offers a significant advantage for investigating channelopathies and cellular signaling pathways.