Abstract
Phage display technology could provide a rapid means for the discovery of novel peptides. To find peptide ligands specific for the brain vascular receptors, we performed a modified phage display method. Phages were recovered from mice brain parenchyma after administrated with a random 7-mer peptide library intravenously. A longer circulation time was arranged according to the biodistributive brain/blood ratios of phage particles. Following sequential rounds of isolation, a number of phages were sequenced and a peptide sequence (CTSTSAPYC, denoted as PepC7) was identified. Clone 7-1, which encodes PepC7, exhibited translocation efficiency about 41-fold higher than the random library phage. Immunofluorescence analysis revealed that Clone 7-1 had a significant superiority on transport efficiency into the brain compared with native M13 phage. Clone 7-1 was inhibited from homing to the brain in a dose-dependent fashion when cyclic peptides of the same sequence were present in a competition assay. Interestingly, the linear peptide (ATSTSAPYA, Pep7) and a scrambled control peptide PepSC7 (CSPATSYTC) did not compete with the phage at the same tested concentration (0.2–200 pg). Labeled by Cy5.5, PepC7 exhibited significant brain-targeting capability in in vivo optical imaging analysis. The cyclic conformation of PepC7 formed by disulfide bond, and the correct structure itself play a critical role in maintaining the selectivity and affinity for the brain. In conclusion, PepC7 is a promising brain-target motif never been reported before and it could be applied to targeted drug delivery into the brain.
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Acknowledgments
This work was supported in part by grants from the National Basic Research Program of China (973 Program) (2007CB935800), National Science and Technology Major Project 2009ZX09310-006 and Doctorial Innovation Fund of Fudan University. We thank Prof. L.P. Wen and Dr. X.M. Wang (University of Science and Technology of China, School of Life Sciences) for technological support in phage display screening.
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Li, J., Zhang, Q., Pang, Z. et al. Identification of peptide sequences that target to the brain using in vivo phage display. Amino Acids 42, 2373–2381 (2012). https://doi.org/10.1007/s00726-011-0979-y
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DOI: https://doi.org/10.1007/s00726-011-0979-y