Spectroscopy and Spectral Analysis, Volume. 35, Issue 2, 457(2015)
Non-Covalent Albumin Conjugates of Silicon(Ⅳ) Phthalocyanines Axially Substituted with Nucleoside: Preparation and in vitro Photodynamic Activities
The interactions of bovine serum albumin (BSA) with five novel silicon (Ⅳ) phthalocyanines(SiPc1-5) axially modified by nucleosides (cytidine, 5-N-cytidine, methyl cytidine, uridine and methyl uridine) derivatives were studied by fluorescence spectroscopy. The results show that there are strong interactions between these silicon phthalocyanines and BSA with a binding constant of(4.90~83.18)×105 mol-1·L. Therefore, the non-covalent BSA conjugate of bis(2’,3’-O-isopropyl-cytidine-oxy) phthalocyaninatosilicon(Ⅳ) (SiPc1) was further been prepared. The molar ratio of phthalocyanine to albumin was found to be 1∶1 for the obtained SiPc1-BSA conjugate. The absorption spectra of SiPc1 and SiPc1-BSA in the visible region have no significant difference, both showing an Q-band maximum at about 686 nm. It indicates that the spectroscopic characteristics of SiPc1 are not affected by binding to albumin. The SiPc1-BSA conjugate exhibits high photodynamic activity against human hepatoma cell line HepG2 with an IC50 value of 3.0×10-7 mol·L-1. By comparsion, SiPc1-BSA has a higher photodynamic activity than SiPc1 (in PBS formation, IC50=7.0×10-7 mol·L-1), which can be attributed to its higher cellular uptake.
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YANG Xiao-mei, ZHENG Bi-yuan, CAI Yue, LIN Ai-lan, SHEN Xiao-min, ZHANG Han-hui, HUANG Jian-dong. Non-Covalent Albumin Conjugates of Silicon(Ⅳ) Phthalocyanines Axially Substituted with Nucleoside: Preparation and in vitro Photodynamic Activities[J]. Spectroscopy and Spectral Analysis, 2015, 35(2): 457
Received: Dec. 26, 2013
Accepted: --
Published Online: Feb. 15, 2015
The Author Email: Xiao-mei YANG (1245736096@qq.com)