TY - JOUR
T1 - Estrogen-nucleic acid adducts
T2 - Reaction of 3,4-estrone o-quinone with nucleic acid bases
AU - Akanni, Abraham
AU - Tabakovic, Katmerka
AU - Abul-Hajj, Yusuf J
N1 - Funding Information:
The dissertation was supported by a predoctoral fellowship from the National Institute of Mental Health (No. 5 F01 MH54723-02).
PY - 1997/4
Y1 - 1997/4
N2 - Metabolic activation of estradiol leading to the formation of catechol estrogens is believed to be a prerequisite for its genotoxic effects. Previous studies have shown that 3,4-estrone quinone (3,4-EQ) can redox- cycle and is capable of inducing exclusively single-strand DNA breaks in MCF- 7 breast cancer cells [Nutter et al. (1991) J. Biol. Chem. 226, 16380- 16386]. These studies, however, could not provide conclusive evidence about the mechanism of estrogen carcinogenesis. In order to explore this in more detail, we have shown previously that 3,4-EQ can react with adenine under electrochemical reductive conditions to yield an estrogen-nucleic acid adduct [Abul-Hajj et al. (1995) J. Am. Chem. Soc. 117, 6144-6145]. In this paper, we report the synthesis and identification of seven estrogen-nucleic acid adducts obtained from reaction of 3,4-EQ with adenine, thymine, and cytosine. Initial purification of reaction mixtures using TLC followed by HPLC gave sufficient quantities of reaction products for identification using 1H-NMR and mass spectral determinations. Reaction of 3,4-EQ with adenine, thymine, and cytosine gave the following estrogen-nucleic acid adducts: 8-(4- hydoxyestrone-1-yl)adenine, 3-adenylimino-1,5(10)-estradiene-4,17-dione, 4- adenylimino-1,5(10)-estradiene-3,17-dione, N1-[4-hydroxyestrone-1(α,β)- yl]thymine, N4-(4-hydroxyestrone-1-yl)cytosine, and N4-(4-hydroxyestrone- 2-yl)cytosine. No reaction products were obtained with guanine presumably due to poor solubility in DMF.
AB - Metabolic activation of estradiol leading to the formation of catechol estrogens is believed to be a prerequisite for its genotoxic effects. Previous studies have shown that 3,4-estrone quinone (3,4-EQ) can redox- cycle and is capable of inducing exclusively single-strand DNA breaks in MCF- 7 breast cancer cells [Nutter et al. (1991) J. Biol. Chem. 226, 16380- 16386]. These studies, however, could not provide conclusive evidence about the mechanism of estrogen carcinogenesis. In order to explore this in more detail, we have shown previously that 3,4-EQ can react with adenine under electrochemical reductive conditions to yield an estrogen-nucleic acid adduct [Abul-Hajj et al. (1995) J. Am. Chem. Soc. 117, 6144-6145]. In this paper, we report the synthesis and identification of seven estrogen-nucleic acid adducts obtained from reaction of 3,4-EQ with adenine, thymine, and cytosine. Initial purification of reaction mixtures using TLC followed by HPLC gave sufficient quantities of reaction products for identification using 1H-NMR and mass spectral determinations. Reaction of 3,4-EQ with adenine, thymine, and cytosine gave the following estrogen-nucleic acid adducts: 8-(4- hydoxyestrone-1-yl)adenine, 3-adenylimino-1,5(10)-estradiene-4,17-dione, 4- adenylimino-1,5(10)-estradiene-3,17-dione, N1-[4-hydroxyestrone-1(α,β)- yl]thymine, N4-(4-hydroxyestrone-1-yl)cytosine, and N4-(4-hydroxyestrone- 2-yl)cytosine. No reaction products were obtained with guanine presumably due to poor solubility in DMF.
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U2 - 10.1021/tx960204m
DO - 10.1021/tx960204m
M3 - Article
C2 - 9114987
AN - SCOPUS:0030911971
SN - 0893-228X
VL - 10
SP - 477
EP - 481
JO - Chemical research in toxicology
JF - Chemical research in toxicology
IS - 4
ER -
