P22 viral capsids as nanocomposite high-relaxivity MRI contrast agents.

P22 viral capsids as nanocomposite high-relaxivity MRI contrast agents.
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DOI:
10.1021/mp300208g
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发表时间:
2013-01-07
影响因子:
4.9
通讯作者:
Douglas T
Douglas T
中科院分区:
医学2区
文献类型:
--
作者:
Qazi S;Liepold LO;Abedin MJ;Johnson B;Prevelige P;Frank JA;Douglas T

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将多个螯合的Gd 3+离子附着到噬菌体P22病毒衣壳的内部提供了具有极高弛豫率值的纳米级MRI造影剂。高度有孔的“wiffleball”形态是P22所特有的,并确保了环境和衣壳内腔之间的水交换。P22“wiffleball”的空腔用包含多个DTPA-Gd复合物的支链低聚物官能化,导致每个64 nm衣壳内的1,900个Gd 3+离子的令人印象深刻的有效载荷。在298 K,0.65T(28 MHz)下,r1离子= 21.7 mM−1 sec−1和r1粒子= 41,300 mM−1 sec−1的高弛豫率被报道,r1/r2比为0.80,并且优化了该系统的旋转相关时间。具体的设计修改,建议为未来的改进病毒captain为基础的MRI造影剂的临床翻译。
Attachment of multiple chelated Gd3+ ions to the interior of bacteriophage P22 viral capsids afford nanoscale MRI contrast agents with extremely high relaxivity values. Highly fenestrated ‘wiffleball’ morphology is unique to P22 and assures water exchange between the environment and interior cavity of the capsid. The cavity of P22 ‘wiffleball’ was functionalized with a branched oligomer comprising of multiple DTPA-Gd complexes resulting in an impressive payload of 1,900 Gd3+ ions inside each 64nm capsid. High relaxivities of r1 ionic = 21.7 mM−1 sec−1 and r1 particle = 41,300 mM−1 sec−1 at 298K, 0.65T (28MHz) are reported, with r1/r2 ratio of 0.80 and optimized rotational correlation time for this system. Specific design modifications are suggested for future improvements of viral capsid-based MRI contrast agents directed toward clinical translation.
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