Advancement in the Methods for Isolating High Quality RNA From Mouse and Rat Intervertebral Disc.

Area of Science:

• Biochemistry
• Molecular Biology
• Genomics

Background:

• Intervertebral disc (IVD) tissue extraction presents challenges due to its proteoglycan-rich matrix and RNases.
• Existing RNA isolation methods require optimization for high RNA integrity.

Purpose of the Study:

• To develop and refine sample preparation and RNA precipitation methods for high-quality RNA extraction from mouse and rat IVD tissues.
• To ensure reproducible results for molecular assessments of IVD sub-types.

Main Methods:

• Tested high salt-isopropanol RNA precipitation on various IVD tissue types (mouse, rat, fresh, stored).
• Utilized RNAlater and TRIzol for sample preservation and RNA isolation.
• Investigated the efficacy of RNAlater-ICE for thawing long-term stored rat IVD samples.

Main Results:

• Achieved high RNA integrity numbers (RINs) from freshly dissected mouse IVD tissues (NP: 9.6-9.8, AF: 8.3-8.9).
• Obtained good RINs from snap-frozen rat IVD tissues (NP: 9.1, AF: 7.4) and RNAlater-stored tissues (NP: 9.6, AF: 8.3).
• RNAlater-ICE yielded acceptable RINs (NP: 8.2, AF: 7.6) from banked rat IVD samples.

Conclusions:

• Successfully established reproducible methods for high-quality RNA extraction from diverse mouse and rat IVD tissue types.
• Highlighted RNAlater-ICE as an effective method for RNA isolation from banked IVD tissues.
• These optimized methods will advance the molecular assessment and understanding of IVD biology.