Abstract:
:Mesothelin is a glycosylphosphatidylinositol-anchored glycoprotein that is highly expressed on the cell surface of mesothelioma, ovarian cancer and other malignant tumors. The interaction between mesothelin and CA125 (also called MUC16) may facilitate the implantation and metastasis of tumors in the peritoneal cavity. A desirable therapeutic agent involves finding a fully human monoclonal antibody (mAb) that binds to mesothelin or CA125 and inhibits their interaction. Here, we report the identification of a novel human mAb to mesothelin. HN1, a human single-chain Fv specific for mesothelin, was isolated from a naïve human single-chain variable fragment (scFv) phage display library. To investigate HN1 as a potential therapeutic, we generated a fully human IgG with the γ 1 heavy chain and the κ light chain and an immuntoxin by fusing the HN1 scFv to a truncated Pseudomonas exotoxin A. The HN1 IgG kills cancer cells with very strong antibody-dependent cell-mediated cytotoxicity. HN1 binds a conformation-sensitive epitope in human mesothelin with high affinity (K(D) = 3 nM). The HN1 epitope is different from that of SS1, a mouse Fv used to develop therapeutic antibodies that are currently in clinical trials. HN1 binds to cell surface-associated mesothelin on human mesothelioma, ovarian cancer, lung adenocarcinoma and pancreatic cancer cells. In addition, HN1 can functionally block the interaction of mesothelin and CA125 on cancer cells. Most importantly, because the HN1 immuntoxin kills mesothelin-expressing cancer cells with high cytotoxic activity, we believe that it has significant potential for mesothelin-expressing cancer treatment and diagnosis.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Ho M,Feng M,Fisher RJ,Rader C,Pastan Idoi
10.1002/ijc.25557subject
Has Abstractpub_date
2011-05-01 00:00:00pages
2020-30issue
9eissn
0020-7136issn
1097-0215journal_volume
128pub_type
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