Biophysical characterization of a riboflavin-conjugated dendrimer platform for targeted drug delivery.

Biophysical characterization of a riboflavin-conjugated dendrimer platform for targeted drug delivery.
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DOI:
10.1021/bm201566g
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发表时间:
2012-02-13
期刊:
影响因子:
6.2
通讯作者:
Sinniah, Kumar
Sinniah, Kumar
中科院分区:
化学2区
文献类型:
--
作者:
Witte, Amanda B.;Timmer, Christine M.;Gam, Jeremy J.;Choi, Seok Ki;Holl, Mark M. Banaszak;Orr, Bradford G.;Baker, James R., Jr.;Sinniah, Kumar

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The present study describes the biophysical characterization of generation 5 poly(amidoamine) (PAMAM) dendrimers conjugated with riboflavin (RF) as a cancer targeting platform. Two new series of dendrimers were designed, each presenting the riboflavin ligand attached at a different site (isoalloxazine at N-3, and D-ribose at N-10) and at varying ligand valency. Isothermal titration calorimetry (ITC) and differential scanning calorimetry (DSC) were used to determine the binding activity for riboflavin binding protein (RfBP) in a cell free solution. The ITC data shows dendrimer conjugates have KD values of ≥465 nM on a riboflavin basis, an affinity ~93-fold lower than that of free riboflavin. The N-3 series showed greater binding affinity in comparison to the N-10 series. Notably, the affinity is inversely correlated with ligand valency. These findings are also corroborated by DSC where greater protein-conjugate stability is achieved with the N-3 series, and at lower ligand valency.
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