Dual PET/Fluorescence Imaging of Glioma with an MMP-14- Activatable Peptide Probe
Abstract
The purpose of the project is to develop and test, in preclinical models, a sensitive, specific imaging peptide probe todistinguish GBM tissue from healthy tissue. The novel imaging probe targets a cell-surface marker, matrix metalloproteinase14 (MMP-14) that is expressed to a much greater degree in GBM cells than in healthy cells. Upon binding to MMP-14, a dualmodality fluorescent tag is activated. This tag is detectable by positron emission tomography (PET) for pre-operative tumorassessment, and by near infrared fluorescence (NIRF) imaging for real-time surgical guidance in distinguishing tumor cellsfrom healthy cells. Results from the project indicate that GBM cells with MMP-14 activity showed activation and retention ofNIRF signal from the cleaved peptide probes. Resected mouse brains with patient derived xenograft (PDX) GBM tumorsshowed tumor-tobackground NIRF ratios of 7.6-11.1 at 4 h after i.v. injection of the peptides. PET images showed localizationof activity in orthotopic PDX tumors after i.v. injection of radiolabeled peptide probes; uptake of the radiolabeled probes intumors was significantly reduced (p<0.05) by blocking with the non-labeled peptide. PET and NIRF signals correlated linearlyin the orthotopic PDX tumors. Immunohistochemistry showed co-localization of MMP-14 expression and NIRF signal in theresected tumors.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2022
- Accession Number
- AD1204994
Entities
People
- Jason M Warram
Organizations
- University of Alabama