title: Serum anti-BPAG1 auto-antibody is a novel marker for human melanoma.
abstract: Malignant melanoma is one of the most aggressive types of tumor. Because malignant melanoma is difficult to treat once it has metastasized, early detection and treatment are essential. The search for reliable biomarkers of early-stage melanoma, therefore, has received much attention. By using a novel method of screening tumor antigens and their auto-antibodies, we identified bullous pemphigoid antigen 1 (BPAG1) as a melanoma antigen recognized by its auto-antibody. BPAG1 is an auto-antigen in the skin disease bullous pemphigoid (BP) and anti-BPAG1 auto-antibodies are detectable in sera from BP patients and are used for BP diagnosis. However, BPAG1 has been viewed as predominantly a keratinocyte-associated protein and a relationship between BPAG1 expression and melanoma has not been previously reported. In the present study, we show that bpag1 is expressed in the mouse F10 melanoma cell line in vitro and F10 melanoma tumors in vivo and that BPAG1 is expressed in human melanoma cell lines (A375 and G361) and normal human melanocytes. Moreover, the levels of anti-BPAG1 auto-antibodies in the sera of melanoma patients were significantly higher than in the sera of healthy volunteers (p<0.01). Furthermore, anti-BPAG1 auto-antibodies were detected in melanoma patients at both early and advanced stages of disease. Here, we report anti-BPAG1 auto-antibodies as a promising marker for the diagnosis of melanoma, and we discuss the significance of the detection of such auto-antibodies in cancer biology and patients.
authors.affiliation: Division of Gene Therapy Science, Osaka University Graduate School of Medicine, Osaka, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Shimbo
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tanemura
authors.forename: Takehiko
authors.initials: T
authors.lastname: Yamazaki
authors.forename: Katsuto
authors.initials: K
authors.lastname: Tamai
authors.forename: Ichiro
authors.initials: I
authors.lastname: Katayama
authors.forename: Yasufumi
authors.initials: Y
authors.lastname: Kaneda
mesh_terms: D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000097:blood* / Q000302:isolation & purification; D000951:Antigens, Neoplasm / Q000097:blood; D001324:Autoantigens / Q000235:genetics / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000097:blood*; D002352:Carrier Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D045744:Cell Line, Tumor; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D000071821:Dystonin; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008544:Melanocytes / Q000378:metabolism; D008545:Melanoma / Q000097:blood* / Q000235:genetics / Q000276:immunology* / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D024041:Non-Fibrillar Collagens / Q000235:genetics / Q000378:metabolism; D019151:Peptide Library; D000097805:Collagen Type XVII
chemical_list: D000888:Antibodies, Anti-Idiotypic; D000951:Antigens, Neoplasm; D001324:Autoantigens; D014408:Biomarkers, Tumor; D002352:Carrier Proteins; D003598:Cytoskeletal Proteins; D000071821:Dystonin; D009419:Nerve Tissue Proteins; D024041:Non-Fibrillar Collagens; D019151:Peptide Library; D000097805:Collagen Type XVII; C486268:DST protein, human