Determination of O6-butylguanine in DNA by immunoaffinity extraction/gas chromatography-mass spectrometry

Marina Bonfanti, Cinzia Magagnotti, Alessandra Galli, Renzo Bagnati, Massimo Moret, Pierluigi Gariboldi, Roberto Fanelli, Luisa Airoldi

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A sensitive, specific, and rapid method for quantitating the minor adduct O6-butylguanine (O6BuG) in hydrolyzed DNA has been developed by combining immunoaffinity chromatography and high resolution gas chromatography-negative ion chemical ionization-mass spectrometry. Polyclonal antibodies raised against O6BuG were coupled to CNBr-activated Sepharose 4B and used for sample clean-up and extraction of the specific O6-alkylguanine. After addition of O6BuG and its deuterium labeled analogue (O6BuG-D7), used as internal standard, hydrolyzed DNA was applied on the immunoaffinity column and washed with water, and the immunoadsorbed butylated guanines were eluted with acetone/ water cetome/water (95/5) before gas chromatographic derivatization. O6BuG and O6BuG-D7 were analyzed and quantitated by high resolution gas chromatography-negative ion chemical ionization-mass spectrometry as their pentafluorobenzyl-trimethylsilyl derivatives. Immunoaffinity column capacity and O6BuG recovery from this column were 1.53 nmol O6BuG/column and 62 ± 5%, respectively. The method was applied to evaluate O6BuG levels in DNA butylated in vitro with 10 mM N-nitroso-Nr-butylurea or isolated from rats given an i.p. dose of 185 mg/kg N-nitroso-N-butylurea or N-nitrosodibutylamine. In the first case the level of modifications present in calf thymus DNA was 104 μmol O6BuG/mol guanine, and in the second case O6BuG in liver DNA was about 6 times higher after N-nitroso-N-butylurea (2.11 μmol O6BuG/mol guanine) than after N-nitrosodibutylamine (0.34 μmol O6BuG/mol guanine) treatment. These results indicate that O6BuG formed in vivo can be isolated and quantitated by this method, which may also be useful for studying DNA damage and repair mechanisms.

Original languageEnglish
Pages (from-to)6870-6875
Number of pages6
JournalCancer Research
Volume50
Issue number21
Publication statusPublished - Nov 1 1990

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dibutylnitrosamine
Guanine
Gas Chromatography-Mass Spectrometry
DNA
Gas Chromatography
Water
Mass Spectrometry
Ions
Deuterium
Acetone
DNA Repair
Sepharose
DNA Damage
Chromatography
Gases
Antibodies
Liver
butylurea

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Bonfanti, M., Magagnotti, C., Galli, A., Bagnati, R., Moret, M., Gariboldi, P., ... Airoldi, L. (1990). Determination of O6-butylguanine in DNA by immunoaffinity extraction/gas chromatography-mass spectrometry. Cancer Research, 50(21), 6870-6875.

Determination of O6-butylguanine in DNA by immunoaffinity extraction/gas chromatography-mass spectrometry. / Bonfanti, Marina; Magagnotti, Cinzia; Galli, Alessandra; Bagnati, Renzo; Moret, Massimo; Gariboldi, Pierluigi; Fanelli, Roberto; Airoldi, Luisa.

In: Cancer Research, Vol. 50, No. 21, 01.11.1990, p. 6870-6875.

Research output: Contribution to journalArticle

Bonfanti, M, Magagnotti, C, Galli, A, Bagnati, R, Moret, M, Gariboldi, P, Fanelli, R & Airoldi, L 1990, 'Determination of O6-butylguanine in DNA by immunoaffinity extraction/gas chromatography-mass spectrometry', Cancer Research, vol. 50, no. 21, pp. 6870-6875.
Bonfanti M, Magagnotti C, Galli A, Bagnati R, Moret M, Gariboldi P et al. Determination of O6-butylguanine in DNA by immunoaffinity extraction/gas chromatography-mass spectrometry. Cancer Research. 1990 Nov 1;50(21):6870-6875.
Bonfanti, Marina ; Magagnotti, Cinzia ; Galli, Alessandra ; Bagnati, Renzo ; Moret, Massimo ; Gariboldi, Pierluigi ; Fanelli, Roberto ; Airoldi, Luisa. / Determination of O6-butylguanine in DNA by immunoaffinity extraction/gas chromatography-mass spectrometry. In: Cancer Research. 1990 ; Vol. 50, No. 21. pp. 6870-6875.
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abstract = "A sensitive, specific, and rapid method for quantitating the minor adduct O6-butylguanine (O6BuG) in hydrolyzed DNA has been developed by combining immunoaffinity chromatography and high resolution gas chromatography-negative ion chemical ionization-mass spectrometry. Polyclonal antibodies raised against O6BuG were coupled to CNBr-activated Sepharose 4B and used for sample clean-up and extraction of the specific O6-alkylguanine. After addition of O6BuG and its deuterium labeled analogue (O6BuG-D7), used as internal standard, hydrolyzed DNA was applied on the immunoaffinity column and washed with water, and the immunoadsorbed butylated guanines were eluted with acetone/ water cetome/water (95/5) before gas chromatographic derivatization. O6BuG and O6BuG-D7 were analyzed and quantitated by high resolution gas chromatography-negative ion chemical ionization-mass spectrometry as their pentafluorobenzyl-trimethylsilyl derivatives. Immunoaffinity column capacity and O6BuG recovery from this column were 1.53 nmol O6BuG/column and 62 ± 5{\%}, respectively. The method was applied to evaluate O6BuG levels in DNA butylated in vitro with 10 mM N-nitroso-Nr-butylurea or isolated from rats given an i.p. dose of 185 mg/kg N-nitroso-N-butylurea or N-nitrosodibutylamine. In the first case the level of modifications present in calf thymus DNA was 104 μmol O6BuG/mol guanine, and in the second case O6BuG in liver DNA was about 6 times higher after N-nitroso-N-butylurea (2.11 μmol O6BuG/mol guanine) than after N-nitrosodibutylamine (0.34 μmol O6BuG/mol guanine) treatment. These results indicate that O6BuG formed in vivo can be isolated and quantitated by this method, which may also be useful for studying DNA damage and repair mechanisms.",
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