The long-term objective of this Program Project is to understand the mutagenic and carcinogenic properties of polycyclic aromatic hydrocarbons (PAH) and related chemical agents at the molecular level.
The specific aims of this Project are largely dictated by the conviction that the long- term objective cannot be met without structural identification and determination of both depurinating and stable DNA adducts and detailed data on the repair of DNA damage from these lesions. To this end, the laser- based techniques of fluorescence line narrowing (FLN) and non-line narrowing (NLN) fluorescence spectroscopy are employed. The research proposed has four aims. The first is to use FLN/NLN spectroscopies for identification of DNA adducts formed by 6-methyl-benzo[alpha]pyrene and 5- methylchrysene. These PAH are suitable for further testing of the hypothesis that apurinic sites play an important role in tumor initiation; formation of adducts by the former and latter occurs predominantly by the one-electron oxidation and diolepoxide pathways, respectively.
The second aim i s to extend our pioneering experimental and computational studies of multiple conformations of diolepoxide adducts from dibenzo[alpha, l]pyrene to benzo[c]phenanthrene and benzo[delta]chrysene, which also possess crowded fjord regions. The molecular conformation of the diolepoxide should influence the mechanistic aspects of binding to DNA, as well as adduct conformations in DNA and repairability.
The third aim i s to apply our recently developed FLN/NLN method to study the repair of stable adducts from dibenzo[alpha,l]pyrene and dibenzo[alpha,h]pyrene and to investigate repair dependence on adduct conformation (external, base-stacked, or intercalated). We also hope to develop a simple and reliable fluorescence- based method for monitoring the repair of apurinic sites in cells. Apurinic sites would be monitored via DNA single-strand breaks which are detected using the fluorescent probe acridine orange.
The fourth aim i s the development of a fluorimetric methodology which yields quantitative adduct profiles for PAH. Such profiles would be important for assessing the dependence of adduct heterogeneity on dosage.
| Cavalieri, Ercole; Saeed, Muhammad; Zahid, Muhammad et al. (2012) Mechanism of DNA depurination by carcinogens in relation to cancer initiation. IUBMB Life 64:169-79 |
| Zahid, Muhammad; Saeed, Muhammad; Rogan, Eleanor G et al. (2010) Benzene and dopamine catechol quinones could initiate cancer or neurogenic disease. Free Radic Biol Med 48:318-24 |
| Saeed, Muhammad; Rogan, Eleanor; Cavalieri, Ercole (2009) Mechanism of metabolic activation and DNA adduct formation by the human carcinogen diethylstilbestrol: the defining link to natural estrogens. Int J Cancer 124:1276-84 |
| Saeed, Muhammad; Higginbotham, Sheila; Gaikwad, Nilesh et al. (2009) Depurinating naphthalene-DNA adducts in mouse skin related to cancer initiation. Free Radic Biol Med 47:1075-81 |
| Lu, Fang; Zahid, Muhammad; Wang, Cheng et al. (2008) Resveratrol prevents estrogen-DNA adduct formation and neoplastic transformation in MCF-10F cells. Cancer Prev Res (Phila Pa) 1:135-45 |
| Gaikwad, Nilesh W; Yang, Li; Muti, Paola et al. (2008) The molecular etiology of breast cancer: evidence from biomarkers of risk. Int J Cancer 122:1949-57 |
| Chakravarti, Dhrubajyoti; Venugopal, Divya; Mailander, Paula C et al. (2008) The role of polycyclic aromatic hydrocarbon-DNA adducts in inducing mutations in mouse skin. Mutat Res 649:161-78 |
| Zahid, Muhammad; Saeed, Muhammad; Lu, Fang et al. (2007) Inhibition of catechol-O-methyltransferase increases estrogen-DNA adduct formation. Free Radic Biol Med 43:1534-40 |
| Gaikwad, Nilesh W; Rogan, Eleanor G; Cavalieri, Ercole L (2007) Evidence from ESI-MS for NQO1-catalyzed reduction of estrogen ortho-quinones. Free Radic Biol Med 43:1289-98 |
| Zahid, Muhammad; Gaikwad, Nilesh W; Rogan, Eleanor G et al. (2007) Inhibition of depurinating estrogen-DNA adduct formation by natural compounds. Chem Res Toxicol 20:1947-53 |
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