Generation of monoclonal antibodies to murine bile duct epithelial cells: Identification of annexin V as a new marker of small intrahepatic bile ducts

• Published in: Hepatology (Baltimore, Md.) Vol. 29; no. 4; pp. 1019 - 1025
• Main Authors: Katayanagi, Kazuyoshi, Van de Water, Judy, Kenny, Thomas, Nakanuma, Yasuni, Ansari, Aftab A., Coppel, Ross, Gershwin, M. Eric
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA W.B. Saunders 01-04-1999; Wiley
• Subjects: Amino Acid Sequence; Animals; Annexin A5 - immunology; Annexin A5 - metabolism; Antibodies, immunoglobulins; Antibodies, Monoclonal - biosynthesis; Antibody Specificity; Bile Ducts, Intrahepatic - metabolism; Biological and medical sciences; Biomarkers - analysis; Cells, Cultured; Epithelial Cells - immunology; Epithelial Cells - metabolism; Female; Fundamental and applied biological sciences. Psychology; Fundamental immunology; Hybridomas - immunology; Hybridomas - metabolism; Immunohistochemistry; Mice; Mice, Inbred BALB C; Molecular immunology; Molecular Sequence Data; Molecular Weight; Monoclonal antibodies; Organ Specificity; Precipitin Tests; Rats; Sequence Analysis; Immunohistochemistry; Biliary tract; Cell culture; Immune response; Digestive system; Rodentia; Biological marker; Monoclonal antibody; Marking; Experimental study; Pathology; Vertebrata; Immunology; Mammalia; Mouse; Animal; Epithelial cell
• ISSN: 0270-9139; 1527-3350
• DOI: 10.1002/hep.510290408

Biliary epithelial cells (BECs) are distributed along the length of both the extrahepatic and intrahepatic biliary tree, but have distinctly different phenotypes and functions according to their anatomical location. It has been reasoned that the distinct appearance of pathogenic lesions in different biliary diseases may be associated with the expression of distinct proteins. These data prompted us to immunize rats with cultured murine BECs with the objective of determining if there are unique antigens on BECs. Of the 45 monoclonal antibodies (mAbs) produced, 12 mAbs (MBEC 1‐12) were selected for detailed study based on their classification into three major groups. These groups included four antibodies (MBEC 1‐4) that reacted in a staining pattern typical of mucin. A second group of mAbs, MBECs 5 to 8, reacted strongly along the biliary tract and by immunoblot analysis, reacted with several bands ranging from 44 kd to 64 kd. These antibodies were considered as markers of pan BECs and their staining pattern proved similar to that of a control polyclonal pan‐cytokeratin. The final group of mAbs, MBECs 9 to 12, recognized a 36‐kd antigen using lysates of murine BECs. These antibodies also predominantly stained small peripheral bile ducts. The reactive antigen was purified by immunoprecipitation and microsequenced; the peptides sequenced showed 100% homology with murine annexin V. The identification of annexin V with predominantly intrahepatic bile ducts, is of significant interest because of the multiple roles of annexin V, including that of membrane cytoskeletal interactions during transport and apoptosis