William Henry Gmeiner,Freddie R. Salsbury,Mark O Lively,Chris H Stuart
申请号：
US15116915
公开号：
US20180133331A1
申请日:
2015.02.05
申请国别(地区):
US
年份:
2018
代理人:
摘要：
Doxorubicin (Dox) is widely used for breast cancer treatment but causes serious side-effects including cardiotoxicity that may adversely impact patient lifespan even if treatment is successful. The present invention relates to selective conjugation of Dox to a single site in a DNA hairpin resulting in a highly stable complex that enables Dox to be used more effectively. Selective conjugation of Dox to G15 in the hairpin loop was verified using site-specific labeling with [2-15N]-2′-deoxyguanosine in conjunction with [1H-15N] 2D NMR while 1:1 stoichiometry for the conjugate was validated by ESI-QTOF mass spectrometry and UV spectroscopy. Molecular modeling indicated covalently bound Dox also intercalated into the stem of the hairpin and stability studies demonstrated the resulting Dox-conjugated hairpin (DCH) complex had a half-life >30 h, considerably longer than alternative covalent and non-covalent complexes. Secondary conjugation of DCH with folic acid (FA) resulted in increased internalization into breast cancer cells. The dual conjugate, DCH-FA, can be used for safer and more effective chemotherapy with Dox and this conjugation strategy can be expanded to include additional anti-cancer drugs.
