Rapid and effective labeling of brain tissue using TAT-conjugated CdS∶Mn/ZnS quantum dots

Literature Information

Publication Date 2005-05-19
DOI 10.1039/B503234B
Impact Factor 6.222
Authors

Swadeshmukul Santra, Heesun Yang, Jessie T. Stanley, Paul H. Holloway, Glenn Walter, Robert A. Mericle


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Abstract

TAT (a cell penetrating peptide)-conjugated CdS∶Mn/ZnS quantum dots (Qdots), intra-arterially delivered to a rat brain, rapidly (within a few minutes) labeled the brain tissue without manipulating the blood-brain-barrier (BBB). Qdot loading was sufficiently high that it allowed a gross fluorescent visualization of the whole rat brain using a low power hand-held UV lamp. Histological data clearly showed that TAT-conjugated Qdots migrated beyond the endothelial cell line and reached the brain parenchyma. Qdots without TAT did not label the brain tissue confirming the fact that TAT peptide was necessary to overcome the BBB. The present study clearly demonstrated the possibility of delivering a large amount of Qdot-based imaging agents to the brain tissue.

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