An LC-MS/MS method for the quantification of tobacco-specific carcinogen protein adducts

Area of Science:

• Biochemistry
• Toxicology
• Analytical Chemistry

Background:

• Tobacco-specific nitrosamines like 4-(methyl-nitrosamino)-1-(3-pyridyl)-1-butanone (NNK) and its metabolite 4-(methylnitrosamino)-l-(3-pyri-dine)-l-butanol (NNAL) are potent lung carcinogens.
• Current methods for detecting NNK and NNAL DNA adducts are difficult to apply to human samples due to limited tissue availability.
• NNAL adducts have not been detected in clinical samples, hindering the understanding of NNAL's role in human carcinogenesis.

Purpose of the Study:

• To develop a sensitive and specific method for quantifying a hydrolyzed NNAL adduct, 1-(3-pyridinyl)-1,4-butanediol (PBD).
• To enable the assessment of tobacco exposure and NNAL bioactivation in clinical settings.

Main Methods:

• Liquid chromatography-tandem mass spectrometry (LC-MS/MS) was employed for sensitive and specific quantification.
• The method was validated for applicability across various biological samples.

Main Results:

• A sensitive and specific LC-MS/MS method was successfully developed to quantify PBD.
• The method demonstrated applicability to a range of biological samples.

Conclusions:

• This novel method allows for the detection of NNAL adducts in clinical samples, a significant advancement.
• The technique can be used to assess tobacco exposure and estimate NNAL bioactivation in human populations, supporting cancer research.