Method for the Isolation of "RNA-seq-Quality" RNA from Human Intervertebral Discs after Mortar and Pestle...

Area of Science:

• Biochemistry
• Molecular Biology
• Biotechnology

Background:

• Isolating high-quality total RNA from intervertebral discs is challenging due to low cell content and abundant extracellular matrix.
• Existing methods often require expensive equipment, enzymatic digestion, or cell culture, limiting accessibility.

Purpose of the Study:

• To establish a simple, accessible, and effective protocol for isolating high-quality RNA from intervertebral disc tissue.
• To enable in situ gene expression analysis of chondrocytes within intervertebral disc samples.

Main Methods:

• Utilized a combination of the QIAzol lysis reagent and RNEasy column purification.
• Employed a basic grinding technique using a mortar and pestle for sample preparation.
• Applied RNA sequencing (RNA-seq) for detailed analysis of isolated RNA and cell composition.

Main Results:

• Successfully isolated high-quality RNA from post-surgical intervertebral disc fragments, achieving a RNA Integrity Number (RIN) of approximately 7.
• RNA-seq analysis confirmed that the isolated RNA reflects the native cell type ratios of intervertebral disc tissue.
• Identified an admixture of blood-related cells in over 70% of chondrocytes across three subtypes.

Conclusions:

• The developed method provides a cost-effective and accessible approach for obtaining high-quality RNA from intervertebral discs.
• This protocol facilitates robust in situ gene expression studies of chondrocytes, crucial for understanding disc health and disease.
• The presence of blood-related cells warrants consideration in future transcriptomic analyses of intervertebral disc tissues.