Exploring phlebotomy technique as a pre-analytical factor in proteomic analyses by mass spectrometry

Area of Science:

• Biochemistry
• Clinical Chemistry
• Analytical Chemistry

Background:

• Multiple reaction monitoring mass spectrometry (MRM-MS) is crucial for blood biomarker validation.
• Pre-analytical factors, such as phlebotomy techniques, can influence MRM-MS results.
• Understanding these influences is vital for reliable biomarker discovery.

Purpose of the Study:

• To investigate the impact of different phlebotomy techniques on plasma protein abundance.
• To assess the influence of blood collection methods on complete blood count (CBC) parameters.
• To determine the suitability of MRM-MS for biomarker studies considering phlebotomy variations.

Main Methods:

• Blood samples were collected from 10 healthy participants using four distinct phlebotomy techniques.
• Plasma protein abundances were analyzed using liquid chromatography-multiple reaction monitoring mass spectrometry (LC/MRM-MS).
• Complete blood count (CBC) parameters were compared across the different collection methods.

Main Results:

• Phlebotomy technique significantly affected 2 out of 11 CBC parameters (red blood cell count and hemoglobin concentration).
• Only 12 out of 117 targeted proteins showed significant abundance changes (p < 0.05) due to phlebotomy technique.
• Matrix metalloproteinase 7 (MMP7) was the only detectable MMP, and its concentration was not significantly affected.

Conclusions:

• Most plasma proteins are not significantly influenced by variations in phlebotomy techniques.
• Phlebotomy technique has a limited impact on the majority of proteins analyzed by LC/MRM-MS.
• Further validation in a larger cohort is recommended to confirm these findings for biomarker development.