GBM; GBMSig; cell-surface proteins; invasion
We present a systems strategy that facilitated the development of a molecular signature for glioblastoma (GBM), composed of 33 cell-surface transmembrane proteins. This molecular signature, GBMSig, was developed through the integration of cell-surface proteomics and transcriptomics from patient tumors in the REMBRANDT (n = 228) and TCGA datasets (n = 547) and can separate GBM patients from control individuals with a Matthew's correlation coefficient value of 0.87 in a lock-down test. Functionally, 17/33 GBMSig proteins are associated with transforming growth factor β signaling pathways, including CD47, SLC16A1, HMOX1, and MRC2. Knockdown of these genes impaired GBM invasion, reflecting their role in disease-perturbed changes in GBM. ELISA assays for a subset of GBMSig (CD44, VCAM1, HMOX1, and BIGH3) on 84 plasma specimens from multiple clinical sites revealed a high degree of separation of GBM patients from healthy control individuals (area under the curve is 0.98 in receiver operating characteristic). In addition, a classifier based on these four proteins differentiated the blood of pre- and post-tumor resections, demonstrating potential clinical value as biomarkers.
Neurosciences (Brain & Spine)
Institute for Systems Biology
Ghosh, Dhimankrishna; Funk, Cory C; Caballero, Juan; Shah, Nameeta; Rouleau, Katherine; Earls, John C; Soroceanu, Liliana; Foltz, Greg; Cobbs, Charles; Price, Nathan D; and Hood, Leroy, "A Cell-Surface Membrane Protein Signature for Glioblastoma." (2017). Articles, Abstracts, and Reports. 1595.