title: Protein complexes/aggregates as potential cancer biomarkers revealed by a nanoparticle aggregation immunoassay.
abstract: Protein-protein interactions and protein complex/aggregate formation play an essential role in almost all biological functions and activities. Through a nanoparticle aggregation immunoassay, we discovered that some proteins are substantially more complexed/aggregated in cancer tissues than normal tissues. This study examined four biomarkers proteins, CA125, CEA (carcinoembryonic antigen), CA19-9 and PAP (prostatic acid phosphatase) in ovarian, colon and prostate tissue lysates. The most exciting results were observed from the PAP assay of prostate tissues: prostate cancer can be clearly distinguished from normal prostate and prostate with benign conditions such as BPH (benign prostate hyperplasia) based on the complex/aggregation level of PAP in prostate tissue lysates. The complex/aggregate level of a protein can be potential biomarkers for cancer detection and diagnosis.
authors.affiliation: NanoScience Technology Center, University of Central Florida, 12424 Research Parkway Suite 400, Orlando, FL 32826, USA. qhuo@mail.ucf.edu
authors.forename: Qun
authors.initials: Q
authors.lastname: Huo
mesh_terms: D000135:Acid Phosphatase; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000906:Antibodies / Q000737:chemistry; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000737:chemistry; D018394:CA-125 Antigen / Q000032:analysis / Q000737:chemistry; D018395:CA-19-9 Antigen / Q000032:analysis / Q000737:chemistry; D002272:Carcinoembryonic Antigen / Q000032:analysis / Q000737:chemistry; D003110:Colonic Neoplasms / Q000175:diagnosis / Q000378:metabolism; D003937:Diagnosis, Differential; D005260:Female; D006046:Gold / Q000737:chemistry; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D008297:Male; D008565:Membrane Proteins / Q000032:analysis / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008875:Middle Aged; D009369:Neoplasms / Q000175:diagnosis / Q000378:metabolism*; D010051:Ovarian Neoplasms / Q000175:diagnosis / Q000378:metabolism; D011470:Prostatic Hyperplasia / Q000175:diagnosis / Q000378:metabolism; D011471:Prostatic Neoplasms / Q000175:diagnosis / Q000378:metabolism; D011485:Protein Binding; D011487:Protein Conformation; D017027:Protein Tyrosine Phosphatases / Q000032:analysis / Q000737:chemistry; D011506:Proteins / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity
chemical_list: D000906:Antibodies; D014408:Biomarkers, Tumor; D018394:CA-125 Antigen; D018395:CA-19-9 Antigen; D002272:Carcinoembryonic Antigen; C451759:MUC16 protein, human; D008565:Membrane Proteins; D011506:Proteins; D006046:Gold; D000135:Acid Phosphatase; C428439:prostatic acid phosphatase; D017027:Protein Tyrosine Phosphatases