Single-cell qPCR on dispersed primary pituitary cells -an optimized protocol

Area of Science:

• Cellular and Molecular Biology
• Neuroendocrinology
• Biotechnology

Background:

• Single-cell quantitative PCR (qPCR) experiments are susceptible to false positive results.
• Optimized protocols are needed for accurate single-cell qPCR in primary pituitary cell cultures after patch-clamp recordings.

Purpose of the Study:

• To develop and validate an optimized protocol for single-cell qPCR measurements in primary pituitary cell cultures.
• To assess and mitigate sources of contamination leading to false positives in single-cell RNA analysis.

Main Methods:

• Comparison of whole-cell harvesting versus cytosol harvesting via patch pipette.
• Assessment of pipette silanization to prevent extracellular RNA adhesion.
• Evaluation of β-escin as a substitute for amphotericin B in perforated patch-clamp recordings.
• Utilized GH₄ cell line and primary fish pituitary cell cultures.

Main Results:

• Whole-cell harvesting in primary cultures yielded false positives due to RNA leakage.
• Cytosol harvesting using patch pipettes significantly reduced contamination.
• Pipette silanization and the use of β-escin were critical for reliable cytosol harvesting.
• No significant difference in RNA isolation efficiency between the two harvesting methods was observed.

Conclusions:

• Validation of cell harvesting techniques is crucial to prevent false positives in single-cell RNA analysis.
• An optimized protocol for secure RNA harvesting from single pituitary cells post-patch clamp is presented.
• This method enhances the reliability of qPCR measurements in primary cell cultures.