Assays for ROS-induced DNA damage

描述（由申请人提供）：该项目是ZeptoMeetings公司和罗斯韦尔公园癌症研究所之间的合作。其目标是开发灵敏、定量和简便的检测方法来测量活性氧（ROS）引起的DNA损伤。ROS与衰老、癌症和几种神经系统疾病有关。将分析7个ROS诱导的DNA损伤，即：嘧啶碱基的甲酰氨基残基、8-氧代-7，9-二氢鸟嘌呤（8-氧代-鸟嘌呤）损伤、胸腺嘧啶乙二醇损伤、6-羟基-5，6-二氢胸腺嘧啶损伤、脱碱基损伤和两个双碱基损伤。32 P-后标记或质谱检测方法与测定一起使用。ZeptoMeetings将使产品商业化，便于通过任何一种方法进行DNA测量。产品将包括用于测定上述病变的参考化合物、载体和内标物。用于32 P-后标记的载体提供了对感兴趣的DNA损伤的明确鉴定。用于MS测量的内标物将被同位素富集至比待定量的DNA损伤更高的质量。ZeptoMeetings预计，最终这些产品的最大应用将是评估细胞和组织的修复能力。用于修复研究的产品将包括参比化合物和含有已鉴定病变的双链DNA底物。液相色谱-质谱法（LC-MS）利用电喷雾接口将开发与此应用，特别是在头脑中。 拟定商业应用： 用于测量氧化性DNA损伤的参考材料、内标物和载体 将被合成。 这些产品将商业化提供，以促进DNA损伤 并通过32 P-后标记或通过LC-MS进行修复。

DESCRIPTION (provided by applicant):This project is a collaboration between ZeptoMetrix Corporation and Roswell Park Cancer Institute. The objective is to develop sensitive, quantitative and facile assays for measuring DNA damage caused by reactive oxygen species (ROS). ROS have been implicated in aging, cancer and several neurological diseases. Seven ROS-induced DNA lesions will be assayed, namely: the formamido remnant of pyrimidine bases, the 8-oxo-7, 9-dihydroguanine (8-oxo-guanine) lesion, the thymine glycol lesion, the 6-hydroxy-5,6-dihydrothymine lesion, the abasic lesion and two double base lesions. 32P-postlabeling or mass spectroscopic methods of detection are employed with the assays. ZeptoMetrix will make products commercially available that facilitate DNA measurements by either method. Products will include reference compounds, carriers and internal standards for assaying the aforementioned lesions. Carriers for 32P-postlabeling provide unequivocal identification of the DNA lesion of interest. Internal standards for MS measurements will be isotopically enriched to a higher mass than the DNA lesion to be quantitated. ZeptoMetrix anticipates that eventually the largest application of these products will be for evaluating the repair capabilities of cells and tissues. Products useful for repair studies will include reference compounds and duplex DNA substrates containing identified lesions. Liquid Chromatography -Mass Spectrometry (LC-MS) utilizing an electrospray interface will be developed with this application especially in mind. PROPOSED COMMERCIAL APPLICATION: Reference materials, internal standards, and carriers for measuring oxidative DNA damage will be synthesized. These products will be offered commercially for facilitating DNA damage and repair by 32P-postlabeling or by LC-MS.