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  4. Bicyclic Peptides Conjugated to an Albumin-Binding Tag Diffuse Efficiently into Solid Tumors
 
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research article

Bicyclic Peptides Conjugated to an Albumin-Binding Tag Diffuse Efficiently into Solid Tumors

Pollaro, Lisa  
•
Raghunathan, Sandeep
•
Morales-Sanfrutos, Julia  
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2015
Molecular Cancer Therapeutics

Monoclonal antibodies have long in vivo half-lives and reach high concentrations in tumors but cannot access all regions in the tissue, whereas smaller ligands such as peptides distribute better but are limited by low concentrations due to fast renal clearance. A potential solution to this problem might be offered by peptide-based ligands that are conjugated to an albumin-binding tag, and thus have a long plasma half-life. Herein, we tested if a small ligand based on a bicyclic peptide (1.9 kDa) conjugated to an albumin- binding peptide (2.3 kDa) can diffuse into tissues. Although the peptide conjugate (4.6 kDa) was most of the time bound to the large protein serum albumin (66.5 kDa), it diffused deeply into tissues and reached high nanomolar concentrations in wide areas of solid tumors. Most of the peptide conjugate isolated from tumor tissue was found to be fully intact 24 hours after administration. Because of its noncovalent interaction with albumin, the bicyclic peptide might dissociate to diffuse to tumor regions that are not accessible to larger ligands. Bicyclic peptides having high binding affinity for targets of interest and being proteolytically stable can be evolved by phage display; in conjunction with albumin-binding tags, they offer a promising format to access targets in solid tumors. (C) 2014 AACR.

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Type
research article
DOI
10.1158/1535-7163.Mct-14-0534
Web of Science ID

WOS:000347938700016

Author(s)
Pollaro, Lisa  
•
Raghunathan, Sandeep
•
Morales-Sanfrutos, Julia  
•
Angelini, Alessandro  
•
Kontos, Stephan
•
Heinis, Christian  
Date Issued

2015

Publisher

Amer Assoc Cancer Research

Published in
Molecular Cancer Therapeutics
Volume

14

Issue

1

Start page

151

End page

161

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPPT  
Available on Infoscience
February 20, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/111306
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