ANTIGENIC COMPOSITION FOR DETECTING AUTO-ANTIBODY WITH SPECIFIC RESPONSE TO EXOSOMAL PROTEIN EIF3A, AND METHOD FOR DIAGNOSING LIVER CANCER USING ANTIGENIC COMPOSITION

摘要

Provided are an autoantibody specifically binding to an exosomal protein EIF3A (Eukaryotic translation initiation factor 3 subunit A) or a fragment including an antigen-binding site (paratope) thereof, a hybridoma cell line producing the autoantibody, a polypeptide having an amino acid sequence of an antigenic determinant (epitope) specifically binding to the autoantibody, a composition for diagnosing liver cancer including an agent measuring an expression level of the autoantibody or the fragment including the antigen-binding site thereof, a kit for diagnosing liver cancer including the composition, and a method of providing information for diagnosis of liver cancer by using the composition. Further, provided is a method of screening for a therapeutic agent for liver cancer by using an expression level of the autoantibody. When anti-EIF3A autoantibody of the present invention is used as a diagnostic marker for liver cancer, the incidence of liver cancer may be diagnosed at a high level only by using non-invasive biological samples. Furthermore, liver cancer may be easily diagnosed by using only the amino acid sequence identified in the present invention, leading to the effective development of diagnostic products such as a diagnostic kit for liver cancer.