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A simplified HPLC method for simultaneously quantifying ribonucleotides and deoxyribonucleotides in cell extracts or
D R Cross1, B J Miller, S J James
1Food and Drug Administration, National Center for Toxicological Research, Jefferson, Arizona 72079.
Cell Proliferation
|July 1, 1993
Summary
This study presents a simplified method for separating ribonucleoside triphosphates (NTP) and deoxyribonucleoside triphosphates (dNTP) using HPLC. This technique allows for accurate analysis of nucleotide metabolism, crucial for understanding DNA synthesis and cell cycle regulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Analytical Chemistry
Background:
- Alterations in deoxyribonucleotide pools significantly impact DNA synthesis and cell cycle progression.
- Accurate quantification of nucleotide pools is essential for studying cellular regulatory mechanisms.
- Previous methods for separating ribonucleoside triphosphates (NTP) and deoxyribonucleoside triphosphates (dNTP) were complex and prone to sample loss.
Purpose of the Study:
- To develop a simplified, single-step procedure for the simultaneous separation and quantification of NTP and dNTP.
- To eliminate the need for cumbersome post-extraction steps.
- To provide a robust method for analyzing nucleotide precursor-product metabolism under diverse conditions.
Main Methods:
- Utilized reversed-phase high-performance liquid chromatography (HPLC) coupled with diode array detection.
- Direct injection of neutralized trichloroacetic acid extracts from tissue samples or cell suspensions.
- Employed high-efficiency C18 columns for optimal nucleotide resolution, with mathematical correction for co-eluting peaks if necessary.
Main Results:
- Achieved simultaneous resolution of NTP and dNTP peaks in a single chromatogram.
- Demonstrated high reproducibility (SD < 5%) and excellent recovery (>99%) of nucleotide standards.
- Showcased the ability to quantify co-eluting nucleotides (e.g., dGTP and ADP) using dual-wavelength detection and mathematical modeling.
Conclusions:
- The presented HPLC method offers a simplified, efficient, and reproducible approach for analyzing nucleotide pools.
- This technique minimizes sample loss and enhances the capability to study nucleotide metabolism.
- The method is suitable for investigating alterations in nucleotide precursor-product metabolism in various physiological and pharmacological contexts.