Single domain based bispecific antibody, Muc1-Bi-1, and its humanized form, Muc1-Bi-2, induce potent cancer cell killing in muc1 positive tumor cells

Muc1 is one of the most studied tumor antigens. However, antibodies or antibody-toxin conjugates against Muc1 have not shown significant efficacy for tumors with Muc1 overexpression. In this study, we employed bispecific antibody approach to target Muc1 positive tumor cells. A novel bispecific antib...

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Veröffentlicht in:PloS one 2018-01, Vol.13 (1), p.e0191024-e0191024
Hauptverfasser: Li, Yumei, Zhou, Changhua, Li, Jing, Liu, Jiayu, Lin, Limin, Li, Li, Cao, Donglin, Li, Qing, Wang, Zhong
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container_title PloS one
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creator Li, Yumei
Zhou, Changhua
Li, Jing
Liu, Jiayu
Lin, Limin
Li, Li
Cao, Donglin
Li, Qing
Wang, Zhong
description Muc1 is one of the most studied tumor antigens. However, antibodies or antibody-toxin conjugates against Muc1 have not shown significant efficacy for tumors with Muc1 overexpression. In this study, we employed bispecific antibody approach to target Muc1 positive tumor cells. A novel bispecific antibody, Muc1-Bi-1, was constructed by linking single domain antibodies, anti-Muc1-VHH and anti-CD16-VHH. Muc1-Bi-2, the humanized form of Muc1-Bi-1, was also constructed by grafting. Both Muc1-Bi bispecific antibodies can be efficiently expressed and purified from bacteria. In vitro, the Muc1-Bi bispecific antibodies can recruit Natural Killer (NK) cells to drive potent and specific cell killing of Muc1-overexpressing tumor cells. In xenograft model, the Muc1-Bi bispecific antibodies can suppress tumor growth in the presence of human peripheral blood mononuclear cells (PBMC). These data suggested that the single domain based Muc1-Bi may provide a valid strategy for targeting tumors with Muc1 overexpression.
doi_str_mv 10.1371/journal.pone.0191024
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subjects Amino acids
Animals
Antibodies
Antibodies, Bispecific - genetics
Antibodies, Bispecific - immunology
Antigen (tumor-associated)
Antigens
Bacteria
Biochemistry
Biology
Biology and life sciences
Bispecific antibodies
Cancer
Cancer therapies
CD16 antigen
Cell Line, Tumor
Cell Proliferation
CHO Cells
Chromatography
Cricetulus
Cytotoxicity
Enzyme-Linked Immunosorbent Assay
Flow Cytometry
Humans
Immunoglobulins
Immunotherapy
Leukocytes (mononuclear)
Lymphocytes
Medicine and health sciences
Mice
Mice, Inbred NOD
Mice, SCID
Mucin-1 - immunology
Nanobodies
Natural killer cells
Neoplasms - pathology
Ovarian cancer
Peripheral blood mononuclear cells
Pharmaceutical sciences
Proteins
Research and Analysis Methods
Toxins
Tumor cells
Tumorigenesis
Tumors
Xenografts
title Single domain based bispecific antibody, Muc1-Bi-1, and its humanized form, Muc1-Bi-2, induce potent cancer cell killing in muc1 positive tumor cells
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