US Patent:
20140271469, Sep 18, 2014
Inventors:
- Palo Alto CA, US
Sanjiv S. Gambhir - Stanford CA, US
Benjamin J. Hackel - Edina MN, US
Robert Teed - Menlo Park CA, US
Bin Shen - Mountain View CA, US
Frederick T Chin - Sunnyvale CA, US
Zhen Cheng - Mountain View CA, US
Assignee:
The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA
International Classification:
C07K 14/00
G01N 33/574
A61K 51/08
US Classification:
424 169, 530324, 514 191, 436501, 435 723, 514 37, 514 193
Abstract:
Disclosed are peptides comprising a molecular scaffold portion and a loop portion that binds to integrin αβ. This integrin is expressed on pancreatic tumors, making the peptides useful as imaging agents, among other uses. The peptides showed single-digit nanomolar dissociation constants similar to antibodies used clinically for imaging and therapy. The peptides rapidly accumulated in αβ-positive tumors, which led to excellent tumor-to-normal contrast. The peptides are specific for the targeted integrin αβreceptors expressed on orthotopic pancreatic tumors and various xenografts used. Additionally, pharmacokinetic-stabilization strategies endowed knots with rapid renal clearance, which significantly reduced off-target dosing.