A xenograft mouse model coupled with in-depth plasma proteome analysis facilitates identification of novel serum biomarkers for human ovarian cancer.
Proteomics discovery of novel cancer serum biomarkers is hindered by the great complexity of serum, patient-to-patient variability, and triggering by the tumor of an acute-phase inflammatory reaction. This host response alters many serum protein levels in cancer patients, but these changes have low specificity as they can be triggered by diverse causes. We addressed these hurdles by utilizing a xenograft mouse model coupled with an in-depth 4-D protein profiling method to identify human proteins in the mouse serum. This strategy ensures that identified putative biomarkers are shed by the tumor, and detection of low-abundance proteins shed by the tumor is enhanced because the mouse blood volume is more than a thousand times smaller than that of a human. Using TOV-112D ovarian tumors, more than 200 human proteins were identified in the mouse serum, including novel candidate biomarkers and proteins previously reported to be elevated in either ovarian tumors or the blood of ovarian cancer patients. Subsequent quantitation of selected putative biomarkers in human sera using label-free multiple reaction monitoring (MRM) mass spectrometry (MS) showed that chloride intracellular channel 1, the mature form of cathepsin D, and peroxiredoxin 6 were elevated significantly in sera from ovarian carcinoma patients.
Center for Systems and Computational Biology and Molecular and Cellular Oncogenesis Program, The Wistar Institute , Philadelphia, Pennsylvania, United States.
Hsin-Yao
HY
Tang
Lynn A
LA
Beer
Tony
T
Chang-Wong
Rachel
R
Hammond
Phyllis
P
Gimotty
George
G
Coukos
David W
DW
Speicher
D000595:Amino Acid Sequence; D000818:Animals; D014408:Biomarkers, Tumor / Q000097:blood*; D001798:Blood Proteins / Q000032:analysis*; D016022:Case-Control Studies; D002402:Cathepsin D / Q000097:blood; D045744:Cell Line, Tumor; D018118:Chloride Channels / Q000097:blood / Q000737:chemistry / Q000378:metabolism; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000097:blood*; D010051:Ovarian Neoplasms / Q000097:blood*; D054465:Peroxiredoxin VI / Q000097:blood; D020543:Proteome / Q000032:analysis*; D040901:Proteomics / Q000379:methods*; D012372:ROC Curve; D015203:Reproducibility of Results; D016415:Sequence Alignment; D013045:Species Specificity; D014183:Transplantation, Heterologous
D014408:Biomarkers, Tumor; D001798:Blood Proteins; C546620:CLIC1 protein, rat; D018118:Chloride Channels; D009363:Neoplasm Proteins; D020543:Proteome; C515977:PRDX6 protein, human; D054465:Peroxiredoxin VI; C533922:CTSD protein, human; D002402:Cathepsin D