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LC-MS-Based Direct Quantification of MicroRNAs in Rat Blood
Hyun-Deok Cho1, Jung Eun Min1, Myeongjin Choi1
1Department of Advanced Toxicology Research, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea.
ACS Omega
|November 16, 2023
Summary
A new liquid chromatography-mass spectrometry (LC-MS) method accurately quantifies seven microRNAs (miRNAs) in rat blood. This technique offers a sensitive and precise alternative for studying immune and inflammatory responses.
Area of Science:
- Biochemistry
- Molecular Biology
- Analytical Chemistry
Background:
- MicroRNAs (miRNAs) are crucial regulators of gene expression with potential as diagnostic biomarkers and therapeutic targets.
- Liquid chromatography-mass spectrometry (LC-MS) is a powerful analytical technique for accurate quantification and multiplexing of biomolecules.
- Detecting miRNAs in biological samples like whole blood is essential for understanding various physiological and pathological processes.
Purpose of the Study:
- To develop and validate a direct-detection liquid chromatography-mass spectrometry (LC-MS) method for quantifying seven specific miRNAs in rat whole blood.
- To compare Trizol and proteinase K extraction methods for optimal miRNA isolation and stability.
- To apply the validated LC-MS method for monitoring miRNA changes in response to inflammatory stimuli.
Main Methods:
- Established an LC-MS method using an oligonucleotide C18 column and a specific mobile phase for chromatographic separation.
- Employed high-resolution full scan analysis with an orbitrap mass analyzer and negative electrospray ionization for MS detection.
- Compared Trizol-based extraction with proteinase K-based extraction, identifying Trizol as superior for sensitivity and convenience.
Main Results:
- The Trizol extraction method demonstrated superior analytical sensitivity and convenience compared to proteinase K extraction.
- The developed LC-MS method was rigorously validated for selectivity, linearity, limit of quantification, accuracy, precision, recovery, matrix effect, carry-over, and stability.
- The assay successfully monitored simultaneous changes in seven target miRNAs in lipopolysaccharide-treated rats, demonstrating its applicability in vivo.
Conclusions:
- The direct-detection LC-MS method provides accurate and precise quantification of multiple miRNAs in rat whole blood.
- This method offers a valuable tool for miRNA research, particularly in studying immune and inflammatory responses.
- The established LC-MS assay holds promise for various applications in miRNA-related diagnostics and therapeutics.
