부산대학교 도서관

To purchase or authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1349-7006.2008.00753.x Byline: Yoshiya Ohno (1), Hideki Yagi (1), Masanori Nakamura (2), Kazue Masuko (1), Yoshiyuki Hashimoto (3), Takashi Masuko (1,4) Abstract: We obtained unique cell-death-inducing monoclonal antibodies (mAbs) named D18 and D19 against chicken DT40 cells. D18 and D19 caused several signs of apoptosis, such as exposed phosphatidyl serine on the cell surface, a sub G.sub.0/G.sub.1 peak, and DNA fragmentation, and inhibited the proliferation of DT40 cells. Flow cytometric and immunohistological analyses of various normal chicken tissues revealed the expression of the antigen recognized by these mAbs to be restricted to cells in lymphoid organs including bone marrow and bursa of fabricius, and to cells in some epithelial tissues. The cell death induced by the mAbs progressed through a mitochondrial pathway with loss of mitochondrial membrane potential. Apoptosis is generally characterized by cell shrinking; however, D18 and D19 elicited swelling, which preceded the cell death. We analyzed the antigen immunoprecipitated by the mAbs, and identified a 90- to 100-kDa cell-surface glycoprotein as the chicken transferrin receptor (TfR). Epitopes recognized by the two mAbs were confirmed to be different by the binding inhibition assay. The reactivity of the mAbs against DT40 cells was not inhibited by excess chicken serum, suggesting that the cell death induced by D18 and D19 was not caused by inhibition of the binding of transferrin (Tf) to chicken TfR. Since D18 and D19 have induced cell death in human embryonic kidney cells transfected with cDNA of the full-length chicken TfR, we expect human TfR to be a promising target in antibody therapy for various human malignancies. (Cancer Sci 2008; 99: 894-900) Author Affiliation: (1)Cell Biology Laboratory, Department of Pharmaceutical Sciences, School of Pharmacy, Kinki University, 4-1 Kowakae 3-chome, Higashiosaka-shi, Osaka, 577-8502; (2)Department of Oral anatomy, Developmental Biology, Showa University School of Dentistry, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555; (3)Kyoritsu University of Pharmacy 1-5-30 Shibakohen, Minato-ku, Tokyo, 105-8512, Japan Article History: (Received November 20, 2007/Revised January 7, 2008/Accepted January 7, 2008) Article note: (4) To whom correspondence should be addressed. E-mail: masuko@phar.kindai.ac.jp